Match DNS records by exact name, not substring#52

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Merged
kierenj merged 2 commits into from
Aug 19, 2026
Merged

Match DNS records by exact name, not substring #52

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d95adec
Match DNS records by exact name, not substring
kierenj Aug 19, 2026
26cf3eb
Make the duplicate-record guard actually stop the script
kierenj Aug 19, 2026
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81 changes: 60 additions & 21 deletions k8s-tools.sh
View file
Open in desktop
Original file line numberDiff line numberDiff line change
@@ -1,6 +1,6 @@
#!/bin/bash

echo cloudflare-cli: k8s-tools v0.0.23
echo cloudflare-cli: k8s-tools v0.0.24

bad=0
if [ -z "$action" ]; then echo "variable 'action' is not set"; bad=1; fi
Expand All@@ -26,10 +26,46 @@ fi
record_type=${CF_DNS_TYPE:="A"}
bad=1

zone_id=$(curl https://api.cloudflare.com/client/v4/zones?name=$CF_API_DOMAIN \
-H "Authorization: Bearer $CF_API_KEY" | jq -r ".result[] | select(.name | contains(\"$CF_API_DOMAIN\")) | .id")
# An API token authenticates as a bearer; a Global API Key needs the account email alongside it.
# Both are accepted, so a chart still supplying CF_API_EMAIL keeps working on this version.
if [ -n "$CF_API_EMAIL" ]; then
auth=(-H "X-Auth-Email: $CF_API_EMAIL" -H "X-Auth-Key: $CF_API_KEY")
else
auth=(-H "Authorization: Bearer $CF_API_KEY")
fi

# The record this invocation owns, as Cloudflare names it. Every lookup below matches it exactly.
case "$subdomain" in
*".$CF_API_DOMAIN") fqdn="$subdomain" ;;
*) fqdn="$subdomain.$CF_API_DOMAIN" ;;
esac

zone_id=$(curl -s -G https://api.cloudflare.com/client/v4/zones \
--data-urlencode "name=$CF_API_DOMAIN" \
"${auth[@]}" | jq -r --arg zone "$CF_API_DOMAIN" '.result[] | select(.name == $zone) | .id')
if [ -z "$zone_id" ]; then echo "zone not found"; exit 1; fi

# Sets $cloudflare_record_id to the id of the record named $fqdn, or to the empty string.
#
# Matching is exact in both the query and the filter. The API's `search` parameter is a substring
# filter, so looking up `pepper` also returns `pepper-mcp`, and a deploy of one service would then
# rewrite or delete another service's record.
#
# Assigns to a global rather than printing: called through $(...) it would run in a subshell, where
# the exit below would end only that subshell and hand the caller an empty id - which reads as "no
# record exists", so a duplicate would quietly add another instead of stopping.
lookup_record_id() {
cloudflare_record_id=$(curl -s -G "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records" \
--data-urlencode "name=$fqdn" \
--data-urlencode "type=$record_type" \
"${auth[@]}" | jq -r --arg fqdn "$fqdn" '.result[] | select(.name == $fqdn) | .id')

if [ "$(printf '%s' "$cloudflare_record_id" | grep -c .)" -gt 1 ]; then
echo "found more than one $record_type record named $fqdn - refusing to guess" >&2
exit 1
fi
}

if [ $action = "create" ]; then
bad=0

Expand DownExpand Up@@ -81,32 +117,31 @@ if [ $action = "create" ]; then
echo public Host Name: $dns_record_value
fi

echo looking up existing record to delete...
cloudflare_record_id=$(curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records?search=$subdomain \
-H "Authorization: Bearer $CF_API_KEY" | jq -r ".result[] | select(.name | contains(\"$subdomain\")) | .id")
echo "looking up existing $record_type record for $fqdn..."
lookup_record_id

if [ -z "$cloudflare_record_id" ]
then
echo creating for first time...
curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records \
curl -s https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records \
-H 'Content-Type: application/json' \
-H "Authorization: Bearer $CF_API_KEY" \
"${auth[@]}" \
-d '{
"content": "'$dns_record_value'",
"name": "'$subdomain'",
"name": "'$fqdn'",
"proxied": '$use_proxy',
"type": "'$record_type'"
}'
retVal=$?
else
echo updating...
curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id \
curl -s "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id" \
-X PATCH \
-H 'Content-Type: application/json' \
-H "Authorization: Bearer $CF_API_KEY" \
"${auth[@]}" \
-d '{
"content": "'$dns_record_value'",
"name": "'$subdomain'",
"name": "'$fqdn'",
"proxied": '$use_proxy',
"type": "'$record_type'"
}'
Expand All@@ -115,16 +150,20 @@ if [ $action = "create" ]; then
fi
if [ $action = "delete" ]; then
bad=0
echo deleting...
echo looking up existing record to delete...
cloudflare_record_id=$(curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records?search=$subdomain \
-H "Authorization: Bearer $CF_API_KEY" | jq -r ".result[] | select(.name | contains(\"$subdomain\")) | .id")
echo "looking up existing $record_type record for $fqdn..."
lookup_record_id

echo deleting...
curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id \
-X DELETE \
-H "Authorization: Bearer $CF_API_KEY"
retVal=$?
if [ -z "$cloudflare_record_id" ]
then
echo "no $record_type record named $fqdn - nothing to delete"
retVal=0
else
echo deleting...
curl -s "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id" \
-X DELETE \
"${auth[@]}"
retVal=$?
fi
fi
if [ $bad -eq 1 ]; then echo "unknown action - use create or delete"; exit 1; fi

Expand Down
13 changes: 13 additions & 0 deletions readme.md
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -2,6 +2,19 @@

This tool is used as aprt of our [helm charts](https://github.com/RedRiverSoftware/k8s/tree/master/helm3-charts) to manage Cloudflare DNS records automatically post deployment.

## Authentication

Set `CF_API_KEY` to a Cloudflare API token and leave `CF_API_EMAIL` unset, or set `CF_API_KEY` to a
Global API Key and `CF_API_EMAIL` to the account address. The presence of `CF_API_EMAIL` selects
between the two, so a chart still passing it keeps working.

## Record matching

A record is matched by its exact name, `$subdomain.$CF_API_DOMAIN`. Cloudflare's `search` parameter
is a substring filter, so matching on the subdomain alone lets one service act on another's record
whenever one name is a prefix of another — `pepper` against `pepper-mcp`, for instance. If a zone
somehow holds more than one matching record, the script stops rather than guessing.

## Update the Docker image

Authenticate to the Azure Container Registry:
Expand Down
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
Match DNS records by exact name, not substring#52

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to your account

 Merged

kierenj
merged 2 commits into

from

Aug 19, 2026
 Merged


Match DNS records by exact name, not substring
#52
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d95adec

Match DNS records by exact name, not substring


kierenj Aug 19, 2026
26cf3eb

Make the duplicate-record guard actually stop the script


kierenj Aug 19, 2026

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81 changes: 60 additions & 21 deletions
k8s-tools.sh

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,6 @@
#!/bin/bash

echo cloudflare-cli: k8s-tools v0.0.23
echo cloudflare-cli: k8s-tools v0.0.24

bad=0
if [ -z "$action" ]; then echo "variable 'action' is not set"; bad=1; fi
Expand All@@ -26,10 +26,46 @@ fi
record_type=${CF_DNS_TYPE:="A"}
bad=1

zone_id=$(curl https://api.cloudflare.com/client/v4/zones?name=$CF_API_DOMAIN \
-H "Authorization: Bearer $CF_API_KEY" | jq -r ".result[] | select(.name | contains(\"$CF_API_DOMAIN\")) | .id")
# An API token authenticates as a bearer; a Global API Key needs the account email alongside it.
# Both are accepted, so a chart still supplying CF_API_EMAIL keeps working on this version.
if [ -n "$CF_API_EMAIL" ]; then
	auth=(-H "X-Auth-Email: $CF_API_EMAIL" -H "X-Auth-Key: $CF_API_KEY")
else
	auth=(-H "Authorization: Bearer $CF_API_KEY")
fi

# The record this invocation owns, as Cloudflare names it. Every lookup below matches it exactly.
case "$subdomain" in
	*".$CF_API_DOMAIN") fqdn="$subdomain" ;;
	*) fqdn="$subdomain.$CF_API_DOMAIN" ;;
esac

zone_id=$(curl -s -G https://api.cloudflare.com/client/v4/zones \
--data-urlencode "name=$CF_API_DOMAIN" \
"${auth[@]}" | jq -r --arg zone "$CF_API_DOMAIN" '.result[] | select(.name == $zone) | .id')
if [ -z "$zone_id" ]; then echo "zone not found"; exit 1; fi

# Sets $cloudflare_record_id to the id of the record named $fqdn, or to the empty string.
#
# Matching is exact in both the query and the filter. The API's `search` parameter is a substring
# filter, so looking up `pepper` also returns `pepper-mcp`, and a deploy of one service would then
# rewrite or delete another service's record.
#
# Assigns to a global rather than printing: called through $(...) it would run in a subshell, where
# the exit below would end only that subshell and hand the caller an empty id - which reads as "no
# record exists", so a duplicate would quietly add another instead of stopping.
lookup_record_id() {
	cloudflare_record_id=$(curl -s -G "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records" \
	--data-urlencode "name=$fqdn" \
	--data-urlencode "type=$record_type" \
	"${auth[@]}" | jq -r --arg fqdn "$fqdn" '.result[] | select(.name == $fqdn) | .id')

	if [ "$(printf '%s' "$cloudflare_record_id" | grep -c .)" -gt 1 ]; then
 echo "found more than one $record_type record named $fqdn - refusing to guess" >&2
 exit 1
	fi
}

if [ $action = "create" ]; then
	bad=0

Expand DownExpand Up@@ -81,32 +117,31 @@ if [ $action = "create" ]; then
 echo public Host Name: $dns_record_value
	fi

	echo looking up existing record to delete...
	cloudflare_record_id=$(curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records?search=$subdomain \
 -H "Authorization: Bearer $CF_API_KEY" | jq -r ".result[] | select(.name | contains(\"$subdomain\")) | .id")
	echo "looking up existing $record_type record for $fqdn..."
	lookup_record_id

	if [ -z "$cloudflare_record_id" ]
	then
 echo creating for first time...
 curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records \
 curl -s https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records \
 -H 'Content-Type: application/json' \
-H "Authorization: Bearer $CF_API_KEY" \
"${auth[@]}" \
 -d '{
 "content": "'$dns_record_value'",
 "name": "'$subdomain'",
 "name": "'$fqdn'",
 "proxied": '$use_proxy',
 "type": "'$record_type'"
 }'
 retVal=$?
	else
 echo updating...
 curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id \
 curl -s "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id" \
 -X PATCH \
 -H 'Content-Type: application/json' \
-H "Authorization: Bearer $CF_API_KEY" \
"${auth[@]}" \
 -d '{
 "content": "'$dns_record_value'",
 "name": "'$subdomain'",
 "name": "'$fqdn'",
 "proxied": '$use_proxy',
 "type": "'$record_type'"
 }'
Expand All@@ -115,16 +150,20 @@ if [ $action = "create" ]; then
fi
if [ $action = "delete" ]; then
	bad=0
	echo deleting...
	echo looking up existing record to delete...
	cloudflare_record_id=$(curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records?search=$subdomain \
 -H "Authorization: Bearer $CF_API_KEY" | jq -r ".result[] | select(.name | contains(\"$subdomain\")) | .id")
	echo "looking up existing $record_type record for $fqdn..."
	lookup_record_id

	echo deleting...
	curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id \
 -X DELETE \
 -H "Authorization: Bearer $CF_API_KEY"
 retVal=$?
	if [ -z "$cloudflare_record_id" ]
	then
 echo "no $record_type record named $fqdn - nothing to delete"
 retVal=0
	else
 echo deleting...
 curl -s "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id" \
 -X DELETE \
 "${auth[@]}"
 retVal=$?
	fi
fi
if [ $bad -eq 1 ]; then echo "unknown action - use create or delete"; exit 1; fi

Expand Down

13 changes: 13 additions & 0 deletions
readme.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -2,6 +2,19 @@

This tool is used as aprt of our [helm charts](https://github.com/RedRiverSoftware/k8s/tree/master/helm3-charts) to manage Cloudflare DNS records automatically post deployment.

## Authentication

Set `CF_API_KEY` to a Cloudflare API token and leave `CF_API_EMAIL` unset, or set `CF_API_KEY` to a
Global API Key and `CF_API_EMAIL` to the account address. The presence of `CF_API_EMAIL` selects
between the two, so a chart still passing it keeps working.

## Record matching

A record is matched by its exact name, `$subdomain.$CF_API_DOMAIN`. Cloudflare's `search` parameter
is a substring filter, so matching on the subdomain alone lets one service act on another's record
whenever one name is a prefix of another — `pepper` against `pepper-mcp`, for instance. If a zone
somehow holds more than one matching record, the script stops rather than guessing.

## Update the Docker image

Authenticate to the Azure Container Registry:
Expand Down

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Match DNS records by exact name, not substring#52

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Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

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to your account

 Merged

kierenj
merged 2 commits into

from

Aug 19, 2026
 Merged


Match DNS records by exact name, not substring
#52
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d95adec

Match DNS records by exact name, not substring


kierenj Aug 19, 2026
26cf3eb

Make the duplicate-record guard actually stop the script


kierenj Aug 19, 2026

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81 changes: 60 additions & 21 deletions
k8s-tools.sh

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,6 @@
#!/bin/bash

echo cloudflare-cli: k8s-tools v0.0.23
echo cloudflare-cli: k8s-tools v0.0.24

bad=0
if [ -z "$action" ]; then echo "variable 'action' is not set"; bad=1; fi
Expand All@@ -26,10 +26,46 @@ fi
record_type=${CF_DNS_TYPE:="A"}
bad=1

zone_id=$(curl https://api.cloudflare.com/client/v4/zones?name=$CF_API_DOMAIN \
-H "Authorization: Bearer $CF_API_KEY" | jq -r ".result[] | select(.name | contains(\"$CF_API_DOMAIN\")) | .id")
# An API token authenticates as a bearer; a Global API Key needs the account email alongside it.
# Both are accepted, so a chart still supplying CF_API_EMAIL keeps working on this version.
if [ -n "$CF_API_EMAIL" ]; then
	auth=(-H "X-Auth-Email: $CF_API_EMAIL" -H "X-Auth-Key: $CF_API_KEY")
else
	auth=(-H "Authorization: Bearer $CF_API_KEY")
fi

# The record this invocation owns, as Cloudflare names it. Every lookup below matches it exactly.
case "$subdomain" in
	*".$CF_API_DOMAIN") fqdn="$subdomain" ;;
	*) fqdn="$subdomain.$CF_API_DOMAIN" ;;
esac

zone_id=$(curl -s -G https://api.cloudflare.com/client/v4/zones \
--data-urlencode "name=$CF_API_DOMAIN" \
"${auth[@]}" | jq -r --arg zone "$CF_API_DOMAIN" '.result[] | select(.name == $zone) | .id')
if [ -z "$zone_id" ]; then echo "zone not found"; exit 1; fi

# Sets $cloudflare_record_id to the id of the record named $fqdn, or to the empty string.
#
# Matching is exact in both the query and the filter. The API's `search` parameter is a substring
# filter, so looking up `pepper` also returns `pepper-mcp`, and a deploy of one service would then
# rewrite or delete another service's record.
#
# Assigns to a global rather than printing: called through $(...) it would run in a subshell, where
# the exit below would end only that subshell and hand the caller an empty id - which reads as "no
# record exists", so a duplicate would quietly add another instead of stopping.
lookup_record_id() {
	cloudflare_record_id=$(curl -s -G "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records" \
	--data-urlencode "name=$fqdn" \
	--data-urlencode "type=$record_type" \
	"${auth[@]}" | jq -r --arg fqdn "$fqdn" '.result[] | select(.name == $fqdn) | .id')

	if [ "$(printf '%s' "$cloudflare_record_id" | grep -c .)" -gt 1 ]; then
 echo "found more than one $record_type record named $fqdn - refusing to guess" >&2
 exit 1
	fi
}

if [ $action = "create" ]; then
	bad=0

Expand DownExpand Up@@ -81,32 +117,31 @@ if [ $action = "create" ]; then
 echo public Host Name: $dns_record_value
	fi

	echo looking up existing record to delete...
	cloudflare_record_id=$(curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records?search=$subdomain \
 -H "Authorization: Bearer $CF_API_KEY" | jq -r ".result[] | select(.name | contains(\"$subdomain\")) | .id")
	echo "looking up existing $record_type record for $fqdn..."
	lookup_record_id

	if [ -z "$cloudflare_record_id" ]
	then
 echo creating for first time...
 curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records \
 curl -s https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records \
 -H 'Content-Type: application/json' \
-H "Authorization: Bearer $CF_API_KEY" \
"${auth[@]}" \
 -d '{
 "content": "'$dns_record_value'",
 "name": "'$subdomain'",
 "name": "'$fqdn'",
 "proxied": '$use_proxy',
 "type": "'$record_type'"
 }'
 retVal=$?
	else
 echo updating...
 curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id \
 curl -s "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id" \
 -X PATCH \
 -H 'Content-Type: application/json' \
-H "Authorization: Bearer $CF_API_KEY" \
"${auth[@]}" \
 -d '{
 "content": "'$dns_record_value'",
 "name": "'$subdomain'",
 "name": "'$fqdn'",
 "proxied": '$use_proxy',
 "type": "'$record_type'"
 }'
Expand All@@ -115,16 +150,20 @@ if [ $action = "create" ]; then
fi
if [ $action = "delete" ]; then
	bad=0
	echo deleting...
	echo looking up existing record to delete...
	cloudflare_record_id=$(curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records?search=$subdomain \
 -H "Authorization: Bearer $CF_API_KEY" | jq -r ".result[] | select(.name | contains(\"$subdomain\")) | .id")
	echo "looking up existing $record_type record for $fqdn..."
	lookup_record_id

	echo deleting...
	curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id \
 -X DELETE \
 -H "Authorization: Bearer $CF_API_KEY"
 retVal=$?
	if [ -z "$cloudflare_record_id" ]
	then
 echo "no $record_type record named $fqdn - nothing to delete"
 retVal=0
	else
 echo deleting...
 curl -s "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id" \
 -X DELETE \
 "${auth[@]}"
 retVal=$?
	fi
fi
if [ $bad -eq 1 ]; then echo "unknown action - use create or delete"; exit 1; fi

Expand Down

13 changes: 13 additions & 0 deletions
readme.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -2,6 +2,19 @@

This tool is used as aprt of our [helm charts](https://github.com/RedRiverSoftware/k8s/tree/master/helm3-charts) to manage Cloudflare DNS records automatically post deployment.

## Authentication

Set `CF_API_KEY` to a Cloudflare API token and leave `CF_API_EMAIL` unset, or set `CF_API_KEY` to a
Global API Key and `CF_API_EMAIL` to the account address. The presence of `CF_API_EMAIL` selects
between the two, so a chart still passing it keeps working.

## Record matching

A record is matched by its exact name, `$subdomain.$CF_API_DOMAIN`. Cloudflare's `search` parameter
is a substring filter, so matching on the subdomain alone lets one service act on another's record
whenever one name is a prefix of another — `pepper` against `pepper-mcp`, for instance. If a zone
somehow holds more than one matching record, the script stops rather than guessing.

## Update the Docker image

Authenticate to the Azure Container Registry:
Expand Down

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Match DNS records by exact name, not substring#52

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kierenj
merged 2 commits into

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Aug 19, 2026
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Match DNS records by exact name, not substring
#52
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d95adec

Match DNS records by exact name, not substring


kierenj Aug 19, 2026
26cf3eb

Make the duplicate-record guard actually stop the script


kierenj Aug 19, 2026

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81 changes: 60 additions & 21 deletions
k8s-tools.sh

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,6 @@
#!/bin/bash

echo cloudflare-cli: k8s-tools v0.0.23
echo cloudflare-cli: k8s-tools v0.0.24

bad=0
if [ -z "$action" ]; then echo "variable 'action' is not set"; bad=1; fi
Expand All@@ -26,10 +26,46 @@ fi
record_type=${CF_DNS_TYPE:="A"}
bad=1

zone_id=$(curl https://api.cloudflare.com/client/v4/zones?name=$CF_API_DOMAIN \
-H "Authorization: Bearer $CF_API_KEY" | jq -r ".result[] | select(.name | contains(\"$CF_API_DOMAIN\")) | .id")
# An API token authenticates as a bearer; a Global API Key needs the account email alongside it.
# Both are accepted, so a chart still supplying CF_API_EMAIL keeps working on this version.
if [ -n "$CF_API_EMAIL" ]; then
	auth=(-H "X-Auth-Email: $CF_API_EMAIL" -H "X-Auth-Key: $CF_API_KEY")
else
	auth=(-H "Authorization: Bearer $CF_API_KEY")
fi

# The record this invocation owns, as Cloudflare names it. Every lookup below matches it exactly.
case "$subdomain" in
	*".$CF_API_DOMAIN") fqdn="$subdomain" ;;
	*) fqdn="$subdomain.$CF_API_DOMAIN" ;;
esac

zone_id=$(curl -s -G https://api.cloudflare.com/client/v4/zones \
--data-urlencode "name=$CF_API_DOMAIN" \
"${auth[@]}" | jq -r --arg zone "$CF_API_DOMAIN" '.result[] | select(.name == $zone) | .id')
if [ -z "$zone_id" ]; then echo "zone not found"; exit 1; fi

# Sets $cloudflare_record_id to the id of the record named $fqdn, or to the empty string.
#
# Matching is exact in both the query and the filter. The API's `search` parameter is a substring
# filter, so looking up `pepper` also returns `pepper-mcp`, and a deploy of one service would then
# rewrite or delete another service's record.
#
# Assigns to a global rather than printing: called through $(...) it would run in a subshell, where
# the exit below would end only that subshell and hand the caller an empty id - which reads as "no
# record exists", so a duplicate would quietly add another instead of stopping.
lookup_record_id() {
	cloudflare_record_id=$(curl -s -G "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records" \
	--data-urlencode "name=$fqdn" \
	--data-urlencode "type=$record_type" \
	"${auth[@]}" | jq -r --arg fqdn "$fqdn" '.result[] | select(.name == $fqdn) | .id')

	if [ "$(printf '%s' "$cloudflare_record_id" | grep -c .)" -gt 1 ]; then
 echo "found more than one $record_type record named $fqdn - refusing to guess" >&2
 exit 1
	fi
}

if [ $action = "create" ]; then
	bad=0

Expand DownExpand Up@@ -81,32 +117,31 @@ if [ $action = "create" ]; then
 echo public Host Name: $dns_record_value
	fi

	echo looking up existing record to delete...
	cloudflare_record_id=$(curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records?search=$subdomain \
 -H "Authorization: Bearer $CF_API_KEY" | jq -r ".result[] | select(.name | contains(\"$subdomain\")) | .id")
	echo "looking up existing $record_type record for $fqdn..."
	lookup_record_id

	if [ -z "$cloudflare_record_id" ]
	then
 echo creating for first time...
 curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records \
 curl -s https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records \
 -H 'Content-Type: application/json' \
-H "Authorization: Bearer $CF_API_KEY" \
"${auth[@]}" \
 -d '{
 "content": "'$dns_record_value'",
 "name": "'$subdomain'",
 "name": "'$fqdn'",
 "proxied": '$use_proxy',
 "type": "'$record_type'"
 }'
 retVal=$?
	else
 echo updating...
 curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id \
 curl -s "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id" \
 -X PATCH \
 -H 'Content-Type: application/json' \
-H "Authorization: Bearer $CF_API_KEY" \
"${auth[@]}" \
 -d '{
 "content": "'$dns_record_value'",
 "name": "'$subdomain'",
 "name": "'$fqdn'",
 "proxied": '$use_proxy',
 "type": "'$record_type'"
 }'
Expand All@@ -115,16 +150,20 @@ if [ $action = "create" ]; then
fi
if [ $action = "delete" ]; then
	bad=0
	echo deleting...
	echo looking up existing record to delete...
	cloudflare_record_id=$(curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records?search=$subdomain \
 -H "Authorization: Bearer $CF_API_KEY" | jq -r ".result[] | select(.name | contains(\"$subdomain\")) | .id")
	echo "looking up existing $record_type record for $fqdn..."
	lookup_record_id

	echo deleting...
	curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id \
 -X DELETE \
 -H "Authorization: Bearer $CF_API_KEY"
 retVal=$?
	if [ -z "$cloudflare_record_id" ]
	then
 echo "no $record_type record named $fqdn - nothing to delete"
 retVal=0
	else
 echo deleting...
 curl -s "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id" \
 -X DELETE \
 "${auth[@]}"
 retVal=$?
	fi
fi
if [ $bad -eq 1 ]; then echo "unknown action - use create or delete"; exit 1; fi

Expand Down

13 changes: 13 additions & 0 deletions
readme.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -2,6 +2,19 @@

This tool is used as aprt of our [helm charts](https://github.com/RedRiverSoftware/k8s/tree/master/helm3-charts) to manage Cloudflare DNS records automatically post deployment.

## Authentication

Set `CF_API_KEY` to a Cloudflare API token and leave `CF_API_EMAIL` unset, or set `CF_API_KEY` to a
Global API Key and `CF_API_EMAIL` to the account address. The presence of `CF_API_EMAIL` selects
between the two, so a chart still passing it keeps working.

## Record matching

A record is matched by its exact name, `$subdomain.$CF_API_DOMAIN`. Cloudflare's `search` parameter
is a substring filter, so matching on the subdomain alone lets one service act on another's record
whenever one name is a prefix of another — `pepper` against `pepper-mcp`, for instance. If a zone
somehow holds more than one matching record, the script stops rather than guessing.

## Update the Docker image

Authenticate to the Azure Container Registry:
Expand Down

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
Match DNS records by exact name, not substring#52

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Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

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Sign in
to your account

 Merged

kierenj
merged 2 commits into

from

Aug 19, 2026
 Merged


Match DNS records by exact name, not substring
#52
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d95adec

Match DNS records by exact name, not substring


kierenj Aug 19, 2026
26cf3eb

Make the duplicate-record guard actually stop the script


kierenj Aug 19, 2026

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81 changes: 60 additions & 21 deletions
k8s-tools.sh

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,6 @@
#!/bin/bash

echo cloudflare-cli: k8s-tools v0.0.23
echo cloudflare-cli: k8s-tools v0.0.24

bad=0
if [ -z "$action" ]; then echo "variable 'action' is not set"; bad=1; fi
Expand All@@ -26,10 +26,46 @@ fi
record_type=${CF_DNS_TYPE:="A"}
bad=1

zone_id=$(curl https://api.cloudflare.com/client/v4/zones?name=$CF_API_DOMAIN \
-H "Authorization: Bearer $CF_API_KEY" | jq -r ".result[] | select(.name | contains(\"$CF_API_DOMAIN\")) | .id")
# An API token authenticates as a bearer; a Global API Key needs the account email alongside it.
# Both are accepted, so a chart still supplying CF_API_EMAIL keeps working on this version.
if [ -n "$CF_API_EMAIL" ]; then
	auth=(-H "X-Auth-Email: $CF_API_EMAIL" -H "X-Auth-Key: $CF_API_KEY")
else
	auth=(-H "Authorization: Bearer $CF_API_KEY")
fi

# The record this invocation owns, as Cloudflare names it. Every lookup below matches it exactly.
case "$subdomain" in
	*".$CF_API_DOMAIN") fqdn="$subdomain" ;;
	*) fqdn="$subdomain.$CF_API_DOMAIN" ;;
esac

zone_id=$(curl -s -G https://api.cloudflare.com/client/v4/zones \
--data-urlencode "name=$CF_API_DOMAIN" \
"${auth[@]}" | jq -r --arg zone "$CF_API_DOMAIN" '.result[] | select(.name == $zone) | .id')
if [ -z "$zone_id" ]; then echo "zone not found"; exit 1; fi

# Sets $cloudflare_record_id to the id of the record named $fqdn, or to the empty string.
#
# Matching is exact in both the query and the filter. The API's `search` parameter is a substring
# filter, so looking up `pepper` also returns `pepper-mcp`, and a deploy of one service would then
# rewrite or delete another service's record.
#
# Assigns to a global rather than printing: called through $(...) it would run in a subshell, where
# the exit below would end only that subshell and hand the caller an empty id - which reads as "no
# record exists", so a duplicate would quietly add another instead of stopping.
lookup_record_id() {
	cloudflare_record_id=$(curl -s -G "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records" \
	--data-urlencode "name=$fqdn" \
	--data-urlencode "type=$record_type" \
	"${auth[@]}" | jq -r --arg fqdn "$fqdn" '.result[] | select(.name == $fqdn) | .id')

	if [ "$(printf '%s' "$cloudflare_record_id" | grep -c .)" -gt 1 ]; then
 echo "found more than one $record_type record named $fqdn - refusing to guess" >&2
 exit 1
	fi
}

if [ $action = "create" ]; then
	bad=0

Expand DownExpand Up@@ -81,32 +117,31 @@ if [ $action = "create" ]; then
 echo public Host Name: $dns_record_value
	fi

	echo looking up existing record to delete...
	cloudflare_record_id=$(curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records?search=$subdomain \
 -H "Authorization: Bearer $CF_API_KEY" | jq -r ".result[] | select(.name | contains(\"$subdomain\")) | .id")
	echo "looking up existing $record_type record for $fqdn..."
	lookup_record_id

	if [ -z "$cloudflare_record_id" ]
	then
 echo creating for first time...
 curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records \
 curl -s https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records \
 -H 'Content-Type: application/json' \
-H "Authorization: Bearer $CF_API_KEY" \
"${auth[@]}" \
 -d '{
 "content": "'$dns_record_value'",
 "name": "'$subdomain'",
 "name": "'$fqdn'",
 "proxied": '$use_proxy',
 "type": "'$record_type'"
 }'
 retVal=$?
	else
 echo updating...
 curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id \
 curl -s "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id" \
 -X PATCH \
 -H 'Content-Type: application/json' \
-H "Authorization: Bearer $CF_API_KEY" \
"${auth[@]}" \
 -d '{
 "content": "'$dns_record_value'",
 "name": "'$subdomain'",
 "name": "'$fqdn'",
 "proxied": '$use_proxy',
 "type": "'$record_type'"
 }'
Expand All@@ -115,16 +150,20 @@ if [ $action = "create" ]; then
fi
if [ $action = "delete" ]; then
	bad=0
	echo deleting...
	echo looking up existing record to delete...
	cloudflare_record_id=$(curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records?search=$subdomain \
 -H "Authorization: Bearer $CF_API_KEY" | jq -r ".result[] | select(.name | contains(\"$subdomain\")) | .id")
	echo "looking up existing $record_type record for $fqdn..."
	lookup_record_id

	echo deleting...
	curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id \
 -X DELETE \
 -H "Authorization: Bearer $CF_API_KEY"
 retVal=$?
	if [ -z "$cloudflare_record_id" ]
	then
 echo "no $record_type record named $fqdn - nothing to delete"
 retVal=0
	else
 echo deleting...
 curl -s "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id" \
 -X DELETE \
 "${auth[@]}"
 retVal=$?
	fi
fi
if [ $bad -eq 1 ]; then echo "unknown action - use create or delete"; exit 1; fi

Expand Down

13 changes: 13 additions & 0 deletions
readme.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -2,6 +2,19 @@

This tool is used as aprt of our [helm charts](https://github.com/RedRiverSoftware/k8s/tree/master/helm3-charts) to manage Cloudflare DNS records automatically post deployment.

## Authentication

Set `CF_API_KEY` to a Cloudflare API token and leave `CF_API_EMAIL` unset, or set `CF_API_KEY` to a
Global API Key and `CF_API_EMAIL` to the account address. The presence of `CF_API_EMAIL` selects
between the two, so a chart still passing it keeps working.

## Record matching

A record is matched by its exact name, `$subdomain.$CF_API_DOMAIN`. Cloudflare's `search` parameter
is a substring filter, so matching on the subdomain alone lets one service act on another's record
whenever one name is a prefix of another — `pepper` against `pepper-mcp`, for instance. If a zone
somehow holds more than one matching record, the script stops rather than guessing.

## Update the Docker image

Authenticate to the Azure Container Registry:
Expand Down

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Match DNS records by exact name, not substring#52

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

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to your account

 Merged

kierenj
merged 2 commits into

from

Aug 19, 2026
 Merged


Match DNS records by exact name, not substring
#52
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d95adec

Match DNS records by exact name, not substring


kierenj Aug 19, 2026
26cf3eb

Make the duplicate-record guard actually stop the script


kierenj Aug 19, 2026

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81 changes: 60 additions & 21 deletions
k8s-tools.sh

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,6 @@
#!/bin/bash

echo cloudflare-cli: k8s-tools v0.0.23
echo cloudflare-cli: k8s-tools v0.0.24

bad=0
if [ -z "$action" ]; then echo "variable 'action' is not set"; bad=1; fi
Expand All@@ -26,10 +26,46 @@ fi
record_type=${CF_DNS_TYPE:="A"}
bad=1

zone_id=$(curl https://api.cloudflare.com/client/v4/zones?name=$CF_API_DOMAIN \
-H "Authorization: Bearer $CF_API_KEY" | jq -r ".result[] | select(.name | contains(\"$CF_API_DOMAIN\")) | .id")
# An API token authenticates as a bearer; a Global API Key needs the account email alongside it.
# Both are accepted, so a chart still supplying CF_API_EMAIL keeps working on this version.
if [ -n "$CF_API_EMAIL" ]; then
	auth=(-H "X-Auth-Email: $CF_API_EMAIL" -H "X-Auth-Key: $CF_API_KEY")
else
	auth=(-H "Authorization: Bearer $CF_API_KEY")
fi

# The record this invocation owns, as Cloudflare names it. Every lookup below matches it exactly.
case "$subdomain" in
	*".$CF_API_DOMAIN") fqdn="$subdomain" ;;
	*) fqdn="$subdomain.$CF_API_DOMAIN" ;;
esac

zone_id=$(curl -s -G https://api.cloudflare.com/client/v4/zones \
--data-urlencode "name=$CF_API_DOMAIN" \
"${auth[@]}" | jq -r --arg zone "$CF_API_DOMAIN" '.result[] | select(.name == $zone) | .id')
if [ -z "$zone_id" ]; then echo "zone not found"; exit 1; fi

# Sets $cloudflare_record_id to the id of the record named $fqdn, or to the empty string.
#
# Matching is exact in both the query and the filter. The API's `search` parameter is a substring
# filter, so looking up `pepper` also returns `pepper-mcp`, and a deploy of one service would then
# rewrite or delete another service's record.
#
# Assigns to a global rather than printing: called through $(...) it would run in a subshell, where
# the exit below would end only that subshell and hand the caller an empty id - which reads as "no
# record exists", so a duplicate would quietly add another instead of stopping.
lookup_record_id() {
	cloudflare_record_id=$(curl -s -G "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records" \
	--data-urlencode "name=$fqdn" \
	--data-urlencode "type=$record_type" \
	"${auth[@]}" | jq -r --arg fqdn "$fqdn" '.result[] | select(.name == $fqdn) | .id')

	if [ "$(printf '%s' "$cloudflare_record_id" | grep -c .)" -gt 1 ]; then
 echo "found more than one $record_type record named $fqdn - refusing to guess" >&2
 exit 1
	fi
}

if [ $action = "create" ]; then
	bad=0

Expand DownExpand Up@@ -81,32 +117,31 @@ if [ $action = "create" ]; then
 echo public Host Name: $dns_record_value
	fi

	echo looking up existing record to delete...
	cloudflare_record_id=$(curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records?search=$subdomain \
 -H "Authorization: Bearer $CF_API_KEY" | jq -r ".result[] | select(.name | contains(\"$subdomain\")) | .id")
	echo "looking up existing $record_type record for $fqdn..."
	lookup_record_id

	if [ -z "$cloudflare_record_id" ]
	then
 echo creating for first time...
 curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records \
 curl -s https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records \
 -H 'Content-Type: application/json' \
-H "Authorization: Bearer $CF_API_KEY" \
"${auth[@]}" \
 -d '{
 "content": "'$dns_record_value'",
 "name": "'$subdomain'",
 "name": "'$fqdn'",
 "proxied": '$use_proxy',
 "type": "'$record_type'"
 }'
 retVal=$?
	else
 echo updating...
 curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id \
 curl -s "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id" \
 -X PATCH \
 -H 'Content-Type: application/json' \
-H "Authorization: Bearer $CF_API_KEY" \
"${auth[@]}" \
 -d '{
 "content": "'$dns_record_value'",
 "name": "'$subdomain'",
 "name": "'$fqdn'",
 "proxied": '$use_proxy',
 "type": "'$record_type'"
 }'
Expand All@@ -115,16 +150,20 @@ if [ $action = "create" ]; then
fi
if [ $action = "delete" ]; then
	bad=0
	echo deleting...
	echo looking up existing record to delete...
	cloudflare_record_id=$(curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records?search=$subdomain \
 -H "Authorization: Bearer $CF_API_KEY" | jq -r ".result[] | select(.name | contains(\"$subdomain\")) | .id")
	echo "looking up existing $record_type record for $fqdn..."
	lookup_record_id

	echo deleting...
	curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id \
 -X DELETE \
 -H "Authorization: Bearer $CF_API_KEY"
 retVal=$?
	if [ -z "$cloudflare_record_id" ]
	then
 echo "no $record_type record named $fqdn - nothing to delete"
 retVal=0
	else
 echo deleting...
 curl -s "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id" \
 -X DELETE \
 "${auth[@]}"
 retVal=$?
	fi
fi
if [ $bad -eq 1 ]; then echo "unknown action - use create or delete"; exit 1; fi

Expand Down

13 changes: 13 additions & 0 deletions
readme.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -2,6 +2,19 @@

This tool is used as aprt of our [helm charts](https://github.com/RedRiverSoftware/k8s/tree/master/helm3-charts) to manage Cloudflare DNS records automatically post deployment.

## Authentication

Set `CF_API_KEY` to a Cloudflare API token and leave `CF_API_EMAIL` unset, or set `CF_API_KEY` to a
Global API Key and `CF_API_EMAIL` to the account address. The presence of `CF_API_EMAIL` selects
between the two, so a chart still passing it keeps working.

## Record matching

A record is matched by its exact name, `$subdomain.$CF_API_DOMAIN`. Cloudflare's `search` parameter
is a substring filter, so matching on the subdomain alone lets one service act on another's record
whenever one name is a prefix of another — `pepper` against `pepper-mcp`, for instance. If a zone
somehow holds more than one matching record, the script stops rather than guessing.

## Update the Docker image

Authenticate to the Azure Container Registry:
Expand Down

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Match DNS records by exact name, not substring#52

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 Merged

kierenj
merged 2 commits into

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Aug 19, 2026
 Merged


Match DNS records by exact name, not substring
#52
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d95adec

Match DNS records by exact name, not substring


kierenj Aug 19, 2026
26cf3eb

Make the duplicate-record guard actually stop the script


kierenj Aug 19, 2026

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81 changes: 60 additions & 21 deletions
k8s-tools.sh

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,6 @@
#!/bin/bash

echo cloudflare-cli: k8s-tools v0.0.23
echo cloudflare-cli: k8s-tools v0.0.24

bad=0
if [ -z "$action" ]; then echo "variable 'action' is not set"; bad=1; fi
Expand All@@ -26,10 +26,46 @@ fi
record_type=${CF_DNS_TYPE:="A"}
bad=1

zone_id=$(curl https://api.cloudflare.com/client/v4/zones?name=$CF_API_DOMAIN \
-H "Authorization: Bearer $CF_API_KEY" | jq -r ".result[] | select(.name | contains(\"$CF_API_DOMAIN\")) | .id")
# An API token authenticates as a bearer; a Global API Key needs the account email alongside it.
# Both are accepted, so a chart still supplying CF_API_EMAIL keeps working on this version.
if [ -n "$CF_API_EMAIL" ]; then
	auth=(-H "X-Auth-Email: $CF_API_EMAIL" -H "X-Auth-Key: $CF_API_KEY")
else
	auth=(-H "Authorization: Bearer $CF_API_KEY")
fi

# The record this invocation owns, as Cloudflare names it. Every lookup below matches it exactly.
case "$subdomain" in
	*".$CF_API_DOMAIN") fqdn="$subdomain" ;;
	*) fqdn="$subdomain.$CF_API_DOMAIN" ;;
esac

zone_id=$(curl -s -G https://api.cloudflare.com/client/v4/zones \
--data-urlencode "name=$CF_API_DOMAIN" \
"${auth[@]}" | jq -r --arg zone "$CF_API_DOMAIN" '.result[] | select(.name == $zone) | .id')
if [ -z "$zone_id" ]; then echo "zone not found"; exit 1; fi

# Sets $cloudflare_record_id to the id of the record named $fqdn, or to the empty string.
#
# Matching is exact in both the query and the filter. The API's `search` parameter is a substring
# filter, so looking up `pepper` also returns `pepper-mcp`, and a deploy of one service would then
# rewrite or delete another service's record.
#
# Assigns to a global rather than printing: called through $(...) it would run in a subshell, where
# the exit below would end only that subshell and hand the caller an empty id - which reads as "no
# record exists", so a duplicate would quietly add another instead of stopping.
lookup_record_id() {
	cloudflare_record_id=$(curl -s -G "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records" \
	--data-urlencode "name=$fqdn" \
	--data-urlencode "type=$record_type" \
	"${auth[@]}" | jq -r --arg fqdn "$fqdn" '.result[] | select(.name == $fqdn) | .id')

	if [ "$(printf '%s' "$cloudflare_record_id" | grep -c .)" -gt 1 ]; then
 echo "found more than one $record_type record named $fqdn - refusing to guess" >&2
 exit 1
	fi
}

if [ $action = "create" ]; then
	bad=0

Expand DownExpand Up@@ -81,32 +117,31 @@ if [ $action = "create" ]; then
 echo public Host Name: $dns_record_value
	fi

	echo looking up existing record to delete...
	cloudflare_record_id=$(curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records?search=$subdomain \
 -H "Authorization: Bearer $CF_API_KEY" | jq -r ".result[] | select(.name | contains(\"$subdomain\")) | .id")
	echo "looking up existing $record_type record for $fqdn..."
	lookup_record_id

	if [ -z "$cloudflare_record_id" ]
	then
 echo creating for first time...
 curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records \
 curl -s https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records \
 -H 'Content-Type: application/json' \
-H "Authorization: Bearer $CF_API_KEY" \
"${auth[@]}" \
 -d '{
 "content": "'$dns_record_value'",
 "name": "'$subdomain'",
 "name": "'$fqdn'",
 "proxied": '$use_proxy',
 "type": "'$record_type'"
 }'
 retVal=$?
	else
 echo updating...
 curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id \
 curl -s "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id" \
 -X PATCH \
 -H 'Content-Type: application/json' \
-H "Authorization: Bearer $CF_API_KEY" \
"${auth[@]}" \
 -d '{
 "content": "'$dns_record_value'",
 "name": "'$subdomain'",
 "name": "'$fqdn'",
 "proxied": '$use_proxy',
 "type": "'$record_type'"
 }'
Expand All@@ -115,16 +150,20 @@ if [ $action = "create" ]; then
fi
if [ $action = "delete" ]; then
	bad=0
	echo deleting...
	echo looking up existing record to delete...
	cloudflare_record_id=$(curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records?search=$subdomain \
 -H "Authorization: Bearer $CF_API_KEY" | jq -r ".result[] | select(.name | contains(\"$subdomain\")) | .id")
	echo "looking up existing $record_type record for $fqdn..."
	lookup_record_id

	echo deleting...
	curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id \
 -X DELETE \
 -H "Authorization: Bearer $CF_API_KEY"
 retVal=$?
	if [ -z "$cloudflare_record_id" ]
	then
 echo "no $record_type record named $fqdn - nothing to delete"
 retVal=0
	else
 echo deleting...
 curl -s "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id" \
 -X DELETE \
 "${auth[@]}"
 retVal=$?
	fi
fi
if [ $bad -eq 1 ]; then echo "unknown action - use create or delete"; exit 1; fi

Expand Down

13 changes: 13 additions & 0 deletions
readme.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -2,6 +2,19 @@

This tool is used as aprt of our [helm charts](https://github.com/RedRiverSoftware/k8s/tree/master/helm3-charts) to manage Cloudflare DNS records automatically post deployment.

## Authentication

Set `CF_API_KEY` to a Cloudflare API token and leave `CF_API_EMAIL` unset, or set `CF_API_KEY` to a
Global API Key and `CF_API_EMAIL` to the account address. The presence of `CF_API_EMAIL` selects
between the two, so a chart still passing it keeps working.

## Record matching

A record is matched by its exact name, `$subdomain.$CF_API_DOMAIN`. Cloudflare's `search` parameter
is a substring filter, so matching on the subdomain alone lets one service act on another's record
whenever one name is a prefix of another — `pepper` against `pepper-mcp`, for instance. If a zone
somehow holds more than one matching record, the script stops rather than guessing.

## Update the Docker image

Authenticate to the Azure Container Registry:
Expand Down

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
Match DNS records by exact name, not substring#52

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Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

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 Merged

kierenj
merged 2 commits into

from

Aug 19, 2026
 Merged


Match DNS records by exact name, not substring
#52
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d95adec

Match DNS records by exact name, not substring


kierenj Aug 19, 2026
26cf3eb

Make the duplicate-record guard actually stop the script


kierenj Aug 19, 2026

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81 changes: 60 additions & 21 deletions
k8s-tools.sh

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,6 @@
#!/bin/bash

echo cloudflare-cli: k8s-tools v0.0.23
echo cloudflare-cli: k8s-tools v0.0.24

bad=0
if [ -z "$action" ]; then echo "variable 'action' is not set"; bad=1; fi
Expand All@@ -26,10 +26,46 @@ fi
record_type=${CF_DNS_TYPE:="A"}
bad=1

zone_id=$(curl https://api.cloudflare.com/client/v4/zones?name=$CF_API_DOMAIN \
-H "Authorization: Bearer $CF_API_KEY" | jq -r ".result[] | select(.name | contains(\"$CF_API_DOMAIN\")) | .id")
# An API token authenticates as a bearer; a Global API Key needs the account email alongside it.
# Both are accepted, so a chart still supplying CF_API_EMAIL keeps working on this version.
if [ -n "$CF_API_EMAIL" ]; then
	auth=(-H "X-Auth-Email: $CF_API_EMAIL" -H "X-Auth-Key: $CF_API_KEY")
else
	auth=(-H "Authorization: Bearer $CF_API_KEY")
fi

# The record this invocation owns, as Cloudflare names it. Every lookup below matches it exactly.
case "$subdomain" in
	*".$CF_API_DOMAIN") fqdn="$subdomain" ;;
	*) fqdn="$subdomain.$CF_API_DOMAIN" ;;
esac

zone_id=$(curl -s -G https://api.cloudflare.com/client/v4/zones \
--data-urlencode "name=$CF_API_DOMAIN" \
"${auth[@]}" | jq -r --arg zone "$CF_API_DOMAIN" '.result[] | select(.name == $zone) | .id')
if [ -z "$zone_id" ]; then echo "zone not found"; exit 1; fi

# Sets $cloudflare_record_id to the id of the record named $fqdn, or to the empty string.
#
# Matching is exact in both the query and the filter. The API's `search` parameter is a substring
# filter, so looking up `pepper` also returns `pepper-mcp`, and a deploy of one service would then
# rewrite or delete another service's record.
#
# Assigns to a global rather than printing: called through $(...) it would run in a subshell, where
# the exit below would end only that subshell and hand the caller an empty id - which reads as "no
# record exists", so a duplicate would quietly add another instead of stopping.
lookup_record_id() {
	cloudflare_record_id=$(curl -s -G "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records" \
	--data-urlencode "name=$fqdn" \
	--data-urlencode "type=$record_type" \
	"${auth[@]}" | jq -r --arg fqdn "$fqdn" '.result[] | select(.name == $fqdn) | .id')

	if [ "$(printf '%s' "$cloudflare_record_id" | grep -c .)" -gt 1 ]; then
 echo "found more than one $record_type record named $fqdn - refusing to guess" >&2
 exit 1
	fi
}

if [ $action = "create" ]; then
	bad=0

Expand DownExpand Up@@ -81,32 +117,31 @@ if [ $action = "create" ]; then
 echo public Host Name: $dns_record_value
	fi

	echo looking up existing record to delete...
	cloudflare_record_id=$(curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records?search=$subdomain \
 -H "Authorization: Bearer $CF_API_KEY" | jq -r ".result[] | select(.name | contains(\"$subdomain\")) | .id")
	echo "looking up existing $record_type record for $fqdn..."
	lookup_record_id

	if [ -z "$cloudflare_record_id" ]
	then
 echo creating for first time...
 curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records \
 curl -s https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records \
 -H 'Content-Type: application/json' \
-H "Authorization: Bearer $CF_API_KEY" \
"${auth[@]}" \
 -d '{
 "content": "'$dns_record_value'",
 "name": "'$subdomain'",
 "name": "'$fqdn'",
 "proxied": '$use_proxy',
 "type": "'$record_type'"
 }'
 retVal=$?
	else
 echo updating...
 curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id \
 curl -s "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id" \
 -X PATCH \
 -H 'Content-Type: application/json' \
-H "Authorization: Bearer $CF_API_KEY" \
"${auth[@]}" \
 -d '{
 "content": "'$dns_record_value'",
 "name": "'$subdomain'",
 "name": "'$fqdn'",
 "proxied": '$use_proxy',
 "type": "'$record_type'"
 }'
Expand All@@ -115,16 +150,20 @@ if [ $action = "create" ]; then
fi
if [ $action = "delete" ]; then
	bad=0
	echo deleting...
	echo looking up existing record to delete...
	cloudflare_record_id=$(curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records?search=$subdomain \
 -H "Authorization: Bearer $CF_API_KEY" | jq -r ".result[] | select(.name | contains(\"$subdomain\")) | .id")
	echo "looking up existing $record_type record for $fqdn..."
	lookup_record_id

	echo deleting...
	curl https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id \
 -X DELETE \
 -H "Authorization: Bearer $CF_API_KEY"
 retVal=$?
	if [ -z "$cloudflare_record_id" ]
	then
 echo "no $record_type record named $fqdn - nothing to delete"
 retVal=0
	else
 echo deleting...
 curl -s "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$cloudflare_record_id" \
 -X DELETE \
 "${auth[@]}"
 retVal=$?
	fi
fi
if [ $bad -eq 1 ]; then echo "unknown action - use create or delete"; exit 1; fi

Expand Down

13 changes: 13 additions & 0 deletions
readme.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -2,6 +2,19 @@

This tool is used as aprt of our [helm charts](https://github.com/RedRiverSoftware/k8s/tree/master/helm3-charts) to manage Cloudflare DNS records automatically post deployment.

## Authentication

Set `CF_API_KEY` to a Cloudflare API token and leave `CF_API_EMAIL` unset, or set `CF_API_KEY` to a
Global API Key and `CF_API_EMAIL` to the account address. The presence of `CF_API_EMAIL` selects
between the two, so a chart still passing it keeps working.

## Record matching

A record is matched by its exact name, `$subdomain.$CF_API_DOMAIN`. Cloudflare's `search` parameter
is a substring filter, so matching on the subdomain alone lets one service act on another's record
whenever one name is a prefix of another — `pepper` against `pepper-mcp`, for instance. If a zone
somehow holds more than one matching record, the script stops rather than guessing.

## Update the Docker image

Authenticate to the Azure Container Registry:
Expand Down