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CHAPTER 12 APPLICATION DEPLOYMENT
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** transaction: commit * executing task restart * executing "sudo /u/apps/emporium/current/script/process/reaper" servers: ["192.168.0.1"] [192.168.0.1] executing command ** [out :: 192.168.0.1] Couldn't find any process matching: /u/apps/emporium/current/public/dispatch.fcgi command finished * executing task spinner * executing "sudo -u rails /u/apps/emporium/current/script/spin" servers: ["192.168.0.1"] [192.168.0.1] executing command command finished Capistrano will also restart existing FastCGI processes with the reaper script, as you can see from the output of the rake command. Next, log in to the remote machine and use the tree command to display the directory structure created by Capistrano. $ tree /u /u `-- apps `-- emporium |-- current -> /u/apps/emporium/releases/20060516214952 |-- releases | `-- 20060516214952 |-- revisions.log `-- shared |-- log `-- system The apps directory contains a separate directory for all applications that have been deployed. Now there s only one directory for Emporium, which contains a subdirectory named releases. The releases directory is where your application is deployed into a directory named after the time and date the build was created. The releases directory is not referred to directly by scripts; instead, they refer to the symbolic link current. The current link is updated by the deploy task and points to the latest version of your application. The next time you deploy your application, you can run rake deploy instead of rake cold_deploy.
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CHAPTER 12 APPLICATION DEPLOYMENT
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Note You should configure the Ferret search engine (introduced in 4) to store the index
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outside your application directory (for example, /u/apps/emporium/shared). This is because Capistrano deploys your application to a different directory each time you perform a deployment. If the index were in the application directory, Ferret wouldn t be able to find it, and would create a new, empty one. One option is to put the indices in shared/index, and create an after_deploy hook that creates a symlink from current/index to shared/index.
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Capistrano also has a built-in task that you can use for running database migrations during deployment on the remote machine. This means that you don t need to create the database schema yourself, as you do when you deploy your application manually. Use the following command to run migrations along with the deployment: $ rake remote:deploy_with_migrations This checks out the latest version of the source on the remote machine. After the checkout has completed, rake runs the migrations, which create the Emporium database.
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The last step we need to perform is to start up LightTPD, which acts as a reverse proxy for the FastCGI processes. Again, we ll create a new task in our deployment recipe to save us the trouble of having to manually log in to the remote server(s) and execute the command each time we want to start the web server. Add the following task to the deployment recipe (config/deploy.rb): task :start_lighttpd, :roles => 'web' do sudo "lighttpd -f /u/apps/emporium/current/config/lighttpd-production.conf" end Notice that we have told Capistrano to run the task only on servers having the web role. Next, run the task by executing the following command: $ cap -a start_lighttpd loading configuration /usr/lib/ruby/gems/1.8/gems/capistrano- 1.1.0/lib/capistrano/recipes/standard.rb loading configuration ./config/deploy.rb * executing task start_lighttpd * executing "sudo lighttpd -f /u/apps/emporium/current/config/lighttpd-production.conf" servers: ["192.168.0.1"] Password: [192.168.0.1] executing command command finished
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CHAPTER 12 APPLICATION DEPLOYMENT
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You should see the script complete successfully.
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Tip You should need to start LightTPD web server only once. Rebooting the machine will, of course, kill your processes, so remember to create a start script that runs at reboot and that starts LightTPD and the spawner process.
Open Emporium in your browser and do a quick test. You shouldn t see any errors, which means that you have completed the deployment. Before we wrap up this chapter, we should tell you that FastCGI processes are known to start acting crazy once in a while. The only option, usually, is to restart the processes. This is one of the reasons why you should install a system monitoring tool like Nagios (http://nagios.org/) or monit (www.tildeslash.com/monit/). These tools help you notice when things go bad not only with FastCGI, but also with other processes and protocols.
Summary
In this chapter, you learned how to set up a real-world production environment. We showed you how to install LightTPD and FastCGI by compiling from source. We also explained how to configure LightTPD for use in a production environment. Then we showed you how to deploy an application manually. Finally, you saw how to automate the deployment process with Capistrano, which makes your life as a developer easier and drastically lowers the barrier for deploying new features into production (at least for procrastinators). In the next chapter, we ll show you how to tune an application s performance.
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