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Example Voting App

A simple distributed application running across multiple Docker containers.

Getting started

Download Docker Desktop for Mac or Windows. Docker Compose will be automatically installed. On Linux, make sure you have the latest version of Compose.

This solution uses Python, Node.js, .NET, with Redis for messaging and Postgres for storage.

Run in this directory to build and run the app:

docker compose up

The vote app will be running at http://localhost:5000, and the results will be at http://localhost:5001.

Alternately, if you want to run it on a Docker Swarm, first make sure you have a swarm. If you don't, run:

docker swarm init

Once you have your swarm, in this directory run:

docker stack deploy --compose-file docker-stack.yml vote

Run the app in Kubernetes

The folder k8s-specifications contains the YAML specifications of the Voting App's services.

Run the following command to create the deployments and services. Note it will create these resources in your current namespace (default if you haven't changed it.)

kubectl create -f k8s-specifications/

The vote web app is then available on port 31000 on each host of the cluster, the result web app is available on port 31001.

To remove them, run:

kubectl delete -f k8s-specifications/

Architecture

Architecture diagram

  • A front-end web app in Python which lets you vote between two options
  • A Redis which collects new votes
  • A .NET worker which consumes votes and stores them in…
  • A Postgres database backed by a Docker volume
  • A Node.js web app which shows the results of the voting in real time

Notes

The voting application only accepts one vote per client browser. It does not register additional votes if a vote has already been submitted from a client.

This isn't an example of a properly architected perfectly designed distributed app... it's just a simple example of the various types of pieces and languages you might see (queues, persistent data, etc), and how to deal with them in Docker at a basic level.

About

Example distributed app composed of multiple containers for Docker, Compose, Swarm, and Kubernetes

Resources

Readme
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Activity

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Watchers

0 watching

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5 forks
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, '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" + '

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Example Voting App
A simple distributed application running across multiple Docker containers.
Getting started
Download Docker Desktop for Mac or Windows. Docker Compose will be automatically installed. On Linux, make sure you have the latest version of Compose.
This solution uses Python, Node.js, .NET, with Redis for messaging and Postgres for storage.
Run in this directory to build and run the app:
docker compose up
The vote app will be running at http://localhost:5000, and the results will be at http://localhost:5001.
Alternately, if you want to run it on a Docker Swarm, first make sure you have a swarm. If you don't, run:
docker swarm init
Once you have your swarm, in this directory run:
docker stack deploy --compose-file docker-stack.yml vote
Run the app in Kubernetes
The folder k8s-specifications contains the YAML specifications of the Voting App's services.
Run the following command to create the deployments and services. Note it will create these resources in your current namespace (default if you haven't changed it.)
kubectl create -f k8s-specifications/
The vote web app is then available on port 31000 on each host of the cluster, the result web app is available on port 31001.
To remove them, run:
kubectl delete -f k8s-specifications/
Architecture
Architecture diagram
  • A front-end web app in Python which lets you vote between two options
  • A Redis which collects new votes
  • A .NET worker which consumes votes and stores them in…
  • A Postgres database backed by a Docker volume
  • A Node.js web app which shows the results of the voting in real time
Notes
The voting application only accepts one vote per client browser. It does not register additional votes if a vote has already been submitted from a client.
This isn't an example of a properly architected perfectly designed distributed app... it's just a simple
example of the various types of pieces and languages you might see (queues, persistent data, etc), and how to
deal with them in Docker at a basic level.
About
Example distributed app composed of multiple containers for Docker, Compose, Swarm, and Kubernetes
Resources
Readme
License
Activity
Stars
0 stars
Watchers
0 watching
Forks
5 forks
Report repository
Releases
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Contributors
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, '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('^' + ".*" + '

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Example Voting App
A simple distributed application running across multiple Docker containers.
Getting started
Download Docker Desktop for Mac or Windows. Docker Compose will be automatically installed. On Linux, make sure you have the latest version of Compose.
This solution uses Python, Node.js, .NET, with Redis for messaging and Postgres for storage.
Run in this directory to build and run the app:
docker compose up
The vote app will be running at http://localhost:5000, and the results will be at http://localhost:5001.
Alternately, if you want to run it on a Docker Swarm, first make sure you have a swarm. If you don't, run:
docker swarm init
Once you have your swarm, in this directory run:
docker stack deploy --compose-file docker-stack.yml vote
Run the app in Kubernetes
The folder k8s-specifications contains the YAML specifications of the Voting App's services.
Run the following command to create the deployments and services. Note it will create these resources in your current namespace (default if you haven't changed it.)
kubectl create -f k8s-specifications/
The vote web app is then available on port 31000 on each host of the cluster, the result web app is available on port 31001.
To remove them, run:
kubectl delete -f k8s-specifications/
Architecture
Architecture diagram
  • A front-end web app in Python which lets you vote between two options
  • A Redis which collects new votes
  • A .NET worker which consumes votes and stores them in…
  • A Postgres database backed by a Docker volume
  • A Node.js web app which shows the results of the voting in real time
Notes
The voting application only accepts one vote per client browser. It does not register additional votes if a vote has already been submitted from a client.
This isn't an example of a properly architected perfectly designed distributed app... it's just a simple
example of the various types of pieces and languages you might see (queues, persistent data, etc), and how to
deal with them in Docker at a basic level.
About
Example distributed app composed of multiple containers for Docker, Compose, Swarm, and Kubernetes
Resources
Readme
License
Activity
Stars
0 stars
Watchers
0 watching
Forks
5 forks
Report repository
Releases
Packages
Contributors
Languages

, '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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Example Voting App
A simple distributed application running across multiple Docker containers.
Getting started
Download Docker Desktop for Mac or Windows. Docker Compose will be automatically installed. On Linux, make sure you have the latest version of Compose.
This solution uses Python, Node.js, .NET, with Redis for messaging and Postgres for storage.
Run in this directory to build and run the app:
docker compose up
The vote app will be running at http://localhost:5000, and the results will be at http://localhost:5001.
Alternately, if you want to run it on a Docker Swarm, first make sure you have a swarm. If you don't, run:
docker swarm init
Once you have your swarm, in this directory run:
docker stack deploy --compose-file docker-stack.yml vote
Run the app in Kubernetes
The folder k8s-specifications contains the YAML specifications of the Voting App's services.
Run the following command to create the deployments and services. Note it will create these resources in your current namespace (default if you haven't changed it.)
kubectl create -f k8s-specifications/
The vote web app is then available on port 31000 on each host of the cluster, the result web app is available on port 31001.
To remove them, run:
kubectl delete -f k8s-specifications/
Architecture
Architecture diagram
  • A front-end web app in Python which lets you vote between two options
  • A Redis which collects new votes
  • A .NET worker which consumes votes and stores them in…
  • A Postgres database backed by a Docker volume
  • A Node.js web app which shows the results of the voting in real time
Notes
The voting application only accepts one vote per client browser. It does not register additional votes if a vote has already been submitted from a client.
This isn't an example of a properly architected perfectly designed distributed app... it's just a simple
example of the various types of pieces and languages you might see (queues, persistent data, etc), and how to
deal with them in Docker at a basic level.
About
Example distributed app composed of multiple containers for Docker, Compose, Swarm, and Kubernetes
Resources
Readme
License
Activity
Stars
0 stars
Watchers
0 watching
Forks
5 forks
Report repository
Releases
Packages
Contributors
Languages

, '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
BranchesTags
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Example Voting App
A simple distributed application running across multiple Docker containers.
Getting started
Download Docker Desktop for Mac or Windows. Docker Compose will be automatically installed. On Linux, make sure you have the latest version of Compose.
This solution uses Python, Node.js, .NET, with Redis for messaging and Postgres for storage.
Run in this directory to build and run the app:
docker compose up
The vote app will be running at http://localhost:5000, and the results will be at http://localhost:5001.
Alternately, if you want to run it on a Docker Swarm, first make sure you have a swarm. If you don't, run:
docker swarm init
Once you have your swarm, in this directory run:
docker stack deploy --compose-file docker-stack.yml vote
Run the app in Kubernetes
The folder k8s-specifications contains the YAML specifications of the Voting App's services.
Run the following command to create the deployments and services. Note it will create these resources in your current namespace (default if you haven't changed it.)
kubectl create -f k8s-specifications/
The vote web app is then available on port 31000 on each host of the cluster, the result web app is available on port 31001.
To remove them, run:
kubectl delete -f k8s-specifications/
Architecture
Architecture diagram
  • A front-end web app in Python which lets you vote between two options
  • A Redis which collects new votes
  • A .NET worker which consumes votes and stores them in…
  • A Postgres database backed by a Docker volume
  • A Node.js web app which shows the results of the voting in real time
Notes
The voting application only accepts one vote per client browser. It does not register additional votes if a vote has already been submitted from a client.
This isn't an example of a properly architected perfectly designed distributed app... it's just a simple
example of the various types of pieces and languages you might see (queues, persistent data, etc), and how to
deal with them in Docker at a basic level.
About
Example distributed app composed of multiple containers for Docker, Compose, Swarm, and Kubernetes
Resources
Readme
License
Activity
Stars
0 stars
Watchers
0 watching
Forks
5 forks
Report repository
Releases
Packages
Contributors
Languages

, '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
BranchesTags
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Example Voting App
A simple distributed application running across multiple Docker containers.
Getting started
Download Docker Desktop for Mac or Windows. Docker Compose will be automatically installed. On Linux, make sure you have the latest version of Compose.
This solution uses Python, Node.js, .NET, with Redis for messaging and Postgres for storage.
Run in this directory to build and run the app:
docker compose up
The vote app will be running at http://localhost:5000, and the results will be at http://localhost:5001.
Alternately, if you want to run it on a Docker Swarm, first make sure you have a swarm. If you don't, run:
docker swarm init
Once you have your swarm, in this directory run:
docker stack deploy --compose-file docker-stack.yml vote
Run the app in Kubernetes
The folder k8s-specifications contains the YAML specifications of the Voting App's services.
Run the following command to create the deployments and services. Note it will create these resources in your current namespace (default if you haven't changed it.)
kubectl create -f k8s-specifications/
The vote web app is then available on port 31000 on each host of the cluster, the result web app is available on port 31001.
To remove them, run:
kubectl delete -f k8s-specifications/
Architecture
Architecture diagram
  • A front-end web app in Python which lets you vote between two options
  • A Redis which collects new votes
  • A .NET worker which consumes votes and stores them in…
  • A Postgres database backed by a Docker volume
  • A Node.js web app which shows the results of the voting in real time
Notes
The voting application only accepts one vote per client browser. It does not register additional votes if a vote has already been submitted from a client.
This isn't an example of a properly architected perfectly designed distributed app... it's just a simple
example of the various types of pieces and languages you might see (queues, persistent data, etc), and how to
deal with them in Docker at a basic level.
About
Example distributed app composed of multiple containers for Docker, Compose, Swarm, and Kubernetes
Resources
Readme
License
Activity
Stars
0 stars
Watchers
0 watching
Forks
5 forks
Report repository
Releases
Packages
Contributors
Languages

, '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
BranchesTags
Repository files navigation
Example Voting App
A simple distributed application running across multiple Docker containers.
Getting started
Download Docker Desktop for Mac or Windows. Docker Compose will be automatically installed. On Linux, make sure you have the latest version of Compose.
This solution uses Python, Node.js, .NET, with Redis for messaging and Postgres for storage.
Run in this directory to build and run the app:
docker compose up
The vote app will be running at http://localhost:5000, and the results will be at http://localhost:5001.
Alternately, if you want to run it on a Docker Swarm, first make sure you have a swarm. If you don't, run:
docker swarm init
Once you have your swarm, in this directory run:
docker stack deploy --compose-file docker-stack.yml vote
Run the app in Kubernetes
The folder k8s-specifications contains the YAML specifications of the Voting App's services.
Run the following command to create the deployments and services. Note it will create these resources in your current namespace (default if you haven't changed it.)
kubectl create -f k8s-specifications/
The vote web app is then available on port 31000 on each host of the cluster, the result web app is available on port 31001.
To remove them, run:
kubectl delete -f k8s-specifications/
Architecture
Architecture diagram
  • A front-end web app in Python which lets you vote between two options
  • A Redis which collects new votes
  • A .NET worker which consumes votes and stores them in…
  • A Postgres database backed by a Docker volume
  • A Node.js web app which shows the results of the voting in real time
Notes
The voting application only accepts one vote per client browser. It does not register additional votes if a vote has already been submitted from a client.
This isn't an example of a properly architected perfectly designed distributed app... it's just a simple
example of the various types of pieces and languages you might see (queues, persistent data, etc), and how to
deal with them in Docker at a basic level.
About
Example distributed app composed of multiple containers for Docker, Compose, Swarm, and Kubernetes
Resources
Readme
License
Activity
Stars
0 stars
Watchers
0 watching
Forks
5 forks
Report repository
Releases
Packages
Contributors
Languages

, '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); }
})();
})();

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Example Voting App
A simple distributed application running across multiple Docker containers.
Getting started
Download Docker Desktop for Mac or Windows. Docker Compose will be automatically installed. On Linux, make sure you have the latest version of Compose.
This solution uses Python, Node.js, .NET, with Redis for messaging and Postgres for storage.
Run in this directory to build and run the app:
docker compose up
The vote app will be running at http://localhost:5000, and the results will be at http://localhost:5001.
Alternately, if you want to run it on a Docker Swarm, first make sure you have a swarm. If you don't, run:
docker swarm init
Once you have your swarm, in this directory run:
docker stack deploy --compose-file docker-stack.yml vote
Run the app in Kubernetes
The folder k8s-specifications contains the YAML specifications of the Voting App's services.
Run the following command to create the deployments and services. Note it will create these resources in your current namespace (default if you haven't changed it.)
kubectl create -f k8s-specifications/
The vote web app is then available on port 31000 on each host of the cluster, the result web app is available on port 31001.
To remove them, run:
kubectl delete -f k8s-specifications/
Architecture
Architecture diagram
  • A front-end web app in Python which lets you vote between two options
  • A Redis which collects new votes
  • A .NET worker which consumes votes and stores them in…
  • A Postgres database backed by a Docker volume
  • A Node.js web app which shows the results of the voting in real time
Notes
The voting application only accepts one vote per client browser. It does not register additional votes if a vote has already been submitted from a client.
This isn't an example of a properly architected perfectly designed distributed app... it's just a simple
example of the various types of pieces and languages you might see (queues, persistent data, etc), and how to
deal with them in Docker at a basic level.
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Example distributed app composed of multiple containers for Docker, Compose, Swarm, and Kubernetes
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