<p> <a href="http://haproxy.1wt.eu/"> HAProxy</a> is a <strong>very fast</strong> and highly configurable software <span class="caps">TCP</span> load balancer. We will show you how to install, configure and test HAProxy without impacting any applications you may already have running. </p> <h3>Installing HAProxy</h3> <p> You can install HAProxy in two way. Either you download it from the source or leave it to yum to download and install everything for you.<br/> The easy way: <code lang="shell-unix-generic" line_numbers="true">yum -y install haproxy cp /etc/haproxy/haproxy.cfg /etc/haproxy/haproxy.cfg_orig wget http://gist.github.com/raw/25482/d39fb332edf977602c183194a1cf5e9a0b5264f9 -O /etc/haproxy/haproxy.cfg </code> <br/> The hard way: <code lang="shell-unix-generic" line_numbers="true">wget http://haproxy.1wt.eu/download/1.3/src/haproxy-1.3.15.9.tar.gz tar xvzf haproxy* && cd haproxy* make TARGET=linux26 cp haproxy /usr/ sudo install --owner=root --group=root -m700 haproxy /usr/sbin/ wget http://gist.github.com/raw/25482/d39fb332edf977602c183194a1cf5e9a0b5264f9 -O /etc/haproxy/haproxy.cfg </code> <br/> You can customize the haproxy.cfg file by editing the listen section with the correct mongrel ports. </p> <p>Ok, we are ready. Lets fire up this thing and test it out.<br/> If you used the easy way, they you can start haproxy by running the following command <code lang="shell-unix-generic" line_numbers="true">/etc/init.d/haproxy start</code> otherwise <code lang="shell-unix-generic" line_numbers="true">haproxy -f /etc/haproxy/haproxy.cfg -D</code> </p> <p> At this point your ready to test your configuration. Assuming your haproxy is listening to port 9001 then calling the fallowing command <code lang="shell-unix-generic" line_numbers="true">curl localhost:9001</code> should give you back the index page of your application. </p> <h3>Configuring Apache</h3> <p> At this point we need to update the apache.<br/> 1. Go to /etc/apache2/ or /etc/httpd/ and run the following command <code lang="shell-unix-generic" line_numbers="true">grep -rn 'Proxy balancer' *</code> open the file and commit out the line <code lang="shell-unix-generic" line_numbers="true"> <Proxy balancer://APPNAMECLUSTER> </code><br/> 2. Look for this line RewriteRule ^/(.*)$ balancer://APPNAME_cluster%{REQUEST_URI} [P,QSA,L]<br/> 3. change the preview line to RewriteRule ^/(.*)$ http://localhost:9001%{REQUEST_URI} [P,QSA,L] <br/> Thats it, restart apache and your good to go </p> 2009-07-03T20:09:37Z 3 2009-07-03T20:10:57Z <p> The end of the world must be near because Moski decided to start a blog and share his scary thoughts with the world. </p> <p> My first attempt to create a blog engine was few months ago. At that point i wondering what’s the easiest way to learn Erlang. So i decided to create a blogging engine using Erlang and i did. You can find the source code <a href="https://github.com/moski/erlyweb-blogging/tree"> here</a>. But it turns out that maintaing this blog and adding new features was time consuming. </p> <p> Today i decided to rewrite the engine using <a href="http://rubyonrails.com"> Ruby on Rails </a>. It took around 5 hours from the point i called the command <code lang="shell-unix-generic" line_numbers="true">rails blog</code> To <code lang="shell-unix-generic" line_numbers="true">mongrel_rails cluster::start</code> which is not bad considering we had to setup the server(configure mongrel_cluster,install and configure haproxy) and create the theme. </p> <p> Next post i will show you how to configure haproxy with rails and some tricks i've learned in these 5 hours. Until then peace. </p> 2009-07-03T13:33:03Z 2 2009-07-03T13:33:03Z <p> This is my first Blog post ever and i wanted to make something special. So i decided to make it the first piece of code i wrote in Erlang.</p> <p> Erlang is such a beautiful language so here we go </p> <code lang="ruby" theme="twilight" line_numbers="false"> -module(hello). -export([hello_world/0]). hello_world()-> io:format("Hello World ~n"). </code> 2009-07-03T12:29:15Z 1 2009-07-03T12:44:00Z