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<!DOCTYPE html>
<!--[if IEMobile 7 ]><html class="no-js iem7"><![endif]-->
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<!--[if (gt IE 8)|(gt IEMobile 7)|!(IEMobile)|!(IE)]><!--><htmlclass="no-js" lang="en"><!--<![endif]-->
<head>
<metacharset="utf-8">
<title>Cloudnode Blog</title>
<metaname="author" content="Cloudnode">
<metaname="description" content="Welcome to the relaunch of our Cloudnode blog. From the beginning it has been hosted on
Posterous. After the acquisition of Posterous by Twitter, …">
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<metaname="HandheldFriendly" content="True">
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<headerrole="banner"><hgroup>
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<ahref="http://cloudno.de"><imgsrc="/images/cloudnode-header-logo.png" alt="Logo"></img></a>
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| The dev blog for cloudno.de, a new Node.js hosting platform.
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<li><ahref="/cloudnode/atom.xml" rel="subscribe-rss" title="subscribe via RSS">RSS</a></li>
</ul>
<formaction="http://google.com/search" method="get">
<fieldsetrole="search">
<inputtype="hidden" name="q" value="site:cloudnode.github.com" />
<inputclass="search" type="text" name="q" results="0" placeholder="Search"/>
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</form>
<ulclass="main-navigation">
<li><ahref="/cloudnode/">Blog</a></li>
<li><ahref="/cloudnode/blog/archives">Archives</a></li>
</ul>
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<divid="main">
<divid="content">
<divclass="blog-index">
<article>
<header>
<h1class="entry-title"><ahref="/cloudnode/blog/2013/04/08/our-blog-now-powered-by-octopress/">Our Blog Now Powered by Octopress</a></h1>
<pclass="meta">
<timedatetime="2013-04-08T21:32:00+02:00" pubdatedata-updated="true">Apr 8<span>th</span>, 2013</time>
</p>
</header>
<divclass="entry-content"><p>Welcome to the relaunch of our Cloudnode blog. From the beginning it has been hosted on
Posterous. After the acquisition of Posterous by Twitter, their new owners have decided to
close Posterous down on April 30th, 2013. Its time now to find a new home for our blog.</p>
<h4>Were To Go?</h4>
<p>Posterous suggests to move to <ahref="http://en.support.wordpress.com/import/import-from-posterous/">WordPress</a> or <ahref="http://help.squarespace.com/customer/portal/articles/881311-importing-content-from-posterous">Squarespace</a>.
There are also Tumbler and Blogger.
But as we had to experience ourselves, hosted blogs have big disadvantages. We wanted more
flexibility and were looking for a solution that could be hosted on multiple providers like
Amazon S3, Google App Engine, GitHub and others.</p>
<h4>Jekyll And Octopress</h4>
<p>While looking for a blog engine that can be hosted on several platforms, one solution showed up
several times. It seems to be best to have no engine at all, but generate static
content which can be hosted everywhere. No database is needed and the performance is top
notch. <ahref="http://octopress.org/">Octopress</a> which is built on top of <ahref="http://jekyllrb.com/">Jekyll</a> is such a solution and a clever way to
create a static blog.</p>
<p>And here it is, our new, fast, responsive and easy to maintain blog:</p>
<divdata-picturedata-alt=><divdata-src=/images/2013/04/new-blog-small.jpg></div><divdata-src=/images/2013/04/new-blog-medium.jpgdata-media="(min-width: 400px)"></div><divdata-src=/images/2013/04/new-blog-large.jpgdata-media="(min-width: 800px)"></div><divdata-src=/images/2013/04/new-blog.pngdata-media="(min-width: 1000px)"></div></div>
<p><noscript><imgsrc="/cloudnode/images/2013/04/new-blog.png"></noscript></p>
</div>
</article>
<article>
<header>
<h1class="entry-title"><ahref="/cloudnode/blog/2012/12/29/uptime-to-the-max/">Uptime to the Max</a></h1>
<pclass="meta">
<timedatetime="2012-12-29T00:00:00+01:00" pubdatedata-updated="true">Dec 29<span>th</span>, 2012</time>
</p>
</header>
<divclass="entry-content"><p>Our web site <ahref="http://cloudno.de">cloudno.de</a> runs as a Node.js app among all the other apps hosted on Cloudnode. Our top goal is to provide excellent performance and maximum uptime for all apps including our own. </p>
<p>When a Node.js application is running at Cloudnode it is started as a dedicated server process using its own port. A reverse proxy routes requests targeted at the app to its corresponding port. Thus many apps share a single proxy instance making it a critical component and a single point of failure.</p>
<p>We are using Nodejitsu’s <ahref="https://github.com/nodejitsu/node-http-proxy">node-http-proxy</a> which normally runs stable. But some apps can give it a hard time, because they are experimental or contain resource leaks. When our monitoring detects such a situation, it takes care by restarting the proxy. Everything is fine after that, but the restart causes a short downtime for all apps which are served by that proxy. Until now…</p>
<p><strong><spanstyle="font-size: medium;">High Availability Proxy To The Rescue</span></strong></p>
<p>Since 33 days we are running two proxies behind a balancer, which directs traffic through the other proxy during restarts.</p>
<p>The admin panel shows the following statistics for the last 33 days:</p>
<ul>
<li>proxy01 has been restarted 5 times with a combined downtime of 09:48 minutes</li>
<li>proxy02 has been restarted 2 times with a combined downtime of 03:53 minutes</li>
</ul>
<p>The overall downtime is <strong>zero</strong> over the period of 33 days 22 hours.</p>
<p><divdata-picturedata-alt=><divdata-src=/images/2012/12/46576317-proxy-stats-small.jpg></div><divdata-src=/images/2012/12/46576317-proxy-stats-medium.jpgdata-media="(min-width: 400px)"></div><divdata-src=/images/2012/12/46576317-proxy-stats-large.jpgdata-media="(min-width: 800px)"></div><divdata-src=/images/2012/12/46576317-proxy-stats.pngdata-media="(min-width: 1000px)"></div></div><noscript><imgsrc="/cloudnode/images/2012/12/46576317-proxy-stats.png"></noscript></p>
<p>This combination works fantastic, supports websockets, keeps away bad traffic and scales to as many proxies and servers as are needed to handle Cloudnode’s future traffic.</p>
</div>
</article>
<article>
<header>
<h1class="entry-title"><ahref="/cloudnode/blog/2012/07/31/monitor-cpu-memory-usage-of-your-hosted-apps/">Monitor CPU & Memory Usage of Your Hosted Apps</a></h1>
<pclass="meta">
<timedatetime="2012-07-31T00:00:00+02:00" pubdatedata-updated="true">Jul 31<span>st</span>, 2012</time>
</p>
</header>
<divclass="entry-content"><p>Our new monitoring helps you to watch the CPU and memory usage of your apps and to identify problems early. If an app is breaking the govenor limits for an extended period, if will be automatically shut down to ensure the best overall performance of all apps. In a later version we will also support switching to a higher level making your app truely elastic and only consuming as much resources as needed.</p>
<p><divdata-picturedata-alt=><divdata-src=/images/2012/07/43371718-monitoring-small.jpg></div><divdata-src=/images/2012/07/43371718-monitoring-medium.jpgdata-media="(min-width: 400px)"></div><divdata-src=/images/2012/07/43371718-monitoring-large.jpgdata-media="(min-width: 800px)"></div><divdata-src=/images/2012/07/43371718-monitoring.pngdata-media="(min-width: 1000px)"></div></div><noscript><imgsrc="/cloudnode/images/2012/07/43371718-monitoring.png"></noscript></p>
<p>The new app management page shows each of your apps with its current resource usage values:</p>
<ul>
<li>RAM Usage - The permanently and exclusively allocated RAM</li>
<li>Virtual RAM - The total size of all allocated virtual RAM </li>
<li>CPU Load - The load of the virtual CPU (1.0 = full load)</li>
<li>CPU Time - The Accumulated CPU time used since the app has been started</li>
</ul>
<p>We are also storing these values in a Redis database to allow graphic output over a time period. (coming soon)</p>
</div>
</article>
<article>
<header>
<h1class="entry-title"><ahref="/cloudnode/blog/2012/07/03/managing-package-dependencies-is-now-a-lot-easier-thanks-to-npm/">Managing Package Dependencies Is Now a Lot Easier Thanks to NPM</a></h1>
<pclass="meta">
<timedatetime="2012-07-03T00:00:00+02:00" pubdatedata-updated="true">Jul 3<span>rd</span>, 2012</time>
</p>
</header>
<divclass="entry-content"><p>There has always been the “cloudnode npm install <package>” command to add packages to your hosted node.js application. These steps were manual and could easily miss a dependency. </p>
<p>NPM has this great feature <ahref="http://npmjs.org/doc/install.html">npm install</a>, that reads a meta file called package.json which describes all required packages and versions.</p>
<p>This command is now part of the git workflow. During git push operations the platform code looks for a package.json file in the main app directory and executes “npm install” on it. All dependencies are now resolved by the package manager.</p>
<p>This works also during updates. Whenever a new package or package version is needed by your app, just edit the package.json file and see NPM doing its magic.</p>
</div>
</article>
<article>
<header>
<h1class="entry-title"><ahref="/cloudnode/blog/2012/03/17/we-now-support-multiple-node-js-versions/">We Now Support Multiple Node.js Versions</a></h1>
<pclass="meta">
<timedatetime="2012-03-17T00:00:00+01:00" pubdatedata-updated="true">Mar 17<span>th</span>, 2012</time>
</p>
</header>
<divclass="entry-content"><p>We have great news for those of you waiting to host Node.js version 0.6.x apps. You can now choose which version to use during application creation or by specifying a ‘node_version’ environment variable for existing apps. You can easily switch by setting the variable to 0.4 or 0.6 and restarting your application. </p>
<p><divdata-picturedata-alt=><divdata-src=/images/2012/03/39103136-new-app-small.jpg></div><divdata-src=/images/2012/03/39103136-new-app-medium.jpgdata-media="(min-width: 400px)"></div><divdata-src=/images/2012/03/39103136-new-app-large.jpgdata-media="(min-width: 800px)"></div><divdata-src=/images/2012/03/39103136-new-app.pngdata-media="(min-width: 1000px)"></div></div><noscript><imgsrc="/cloudnode/images/2012/03/39103136-new-app.png"></noscript></p>
<p>The Log file will show which version is in use:</p>
<h4style="margin-top: 0px; margin-bottom: 0px; font-size: 16px; color: #999999;">Application Log</h4>
<divstyle="color: #000000; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: left; text-indent: 0px; background-color: #ffffff;"><br/>11 Mar 19:45:22 - Inside Node Virtual Machine<br/>11 Mar 19:45:22 - <strong>Version: v0.6.12</strong><br/>11 Mar 19:45:22 - Owning user: 501<br/>11 Mar 19:45:22 - User Changed: 501<br/>11 Mar 19:45:22 - Checking for /etc<br/>11 Mar 19:45:22 - Update /etc/resolve.conf with Googles DNS servers..</div>
<p>Enjoy!</p>
</div>
</article>
<divclass="pagination">
<aclass="prev" href="/cloudnode/blog/page/2/">← Older</a>
<ahref="/cloudnode/blog/archives">Blog Archives</a>
</div>
</div>
<asideclass="sidebar">
<section>
<h1>Recent Posts</h1>
<ulid="recent_posts">
<liclass="post">
<ahref="/cloudnode/blog/2013/04/08/our-blog-now-powered-by-octopress/">Our Blog Now Powered By Octopress</a>
</li>
<liclass="post">
<ahref="/cloudnode/blog/2012/12/29/uptime-to-the-max/">Uptime To The Max</a>
</li>
<liclass="post">
<ahref="/cloudnode/blog/2012/07/31/monitor-cpu-memory-usage-of-your-hosted-apps/">Monitor CPU & Memory Usage Of Your Hosted Apps</a>
</li>
<liclass="post">
<ahref="/cloudnode/blog/2012/07/03/managing-package-dependencies-is-now-a-lot-easier-thanks-to-npm/">Managing package dependencies is now a lot easier thanks to NPM</a>
</li>
<liclass="post">
<ahref="/cloudnode/blog/2012/03/17/we-now-support-multiple-node-js-versions/">We now support multiple Node.js versions</a>
</li>
</ul>
</section>
</aside>
</div>
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Copyright © 2013 - Cloudnode -
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