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2012-10-02T14:07:21.150
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Things you will need are: <ol> <li><a href="http://wiki.opscode.com/display/chef/Launch+Cloud+Instances+with+Knife" rel="nofollow">knife-ec2</a> - This is used to start/stop Amazon EC2 instances.</li> <li><a href="http://wiki.opscode.com/display/chef/Installing+Chef+Server" rel="nofollow">chef-server</a> - To be able to use search in your recipes. It should be also accessible from your EC2 instances.</li> <li><a href="http://wiki.opscode.com/display/chef/Search" rel="nofollow">search</a> - with this you will be able to find among the nodes provisioned by chef, exactly the one you need using different queries.</li> </ol> I have lately written an article <a href="http://dracoater.blogspot.com/2012/09/how-to-run-dynamic-cloud-tests-with-800.html" rel="nofollow">How to Run Dynamic Cloud Tests with 800 Tomcats, Amazon EC2, Jenkins and LiveRebel</a>. It involves loadbalancer installation and loadbalancer must know all IP adresses of the servers it balances. You can check out the <a href="https://github.com/DracoAter/lr-cluster/blob/master/cookbooks/tomcat/recipes/lr-tomcat.rb" rel="nofollow">recipe of balanced node</a>, how it looks for loadbalancer: <pre><code>search(:node, "roles:lr-loadbalancer").first </code></pre> And check out the <a href="https://github.com/DracoAter/lr-cluster/blob/master/cookbooks/apache2/recipes/default.rb" rel="nofollow">loadbalancer recipe</a>, how it looks for all the balanced nodes and updates the apache config file: <pre><code>lr_nodes = search(:node, "role:lr-node") template ::File.join( node[:apache2][:home], 'conf.d', 'httpd-proxy-balancer.conf' ) do mode 0644 variables(:lr_nodes => lr_nodes) notifies :restart, 'service[apache2]' end </code></pre>
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