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CHAPTER 12 APPLICATION DEPLOYMENT
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Understanding Deployment Recipe Components
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The deployment recipe consists of tasks, roles, and variables, which can be customized for your production environment. Roles Capistrano allows you to assign roles to servers. For example, all servers running MySQL are assigned the db role, servers running LightTPD are assigned the web role, and the servers running the FastCGI processes are assigned the app role. Roles allow you to target tasks to be run only on servers having a specific role. Roles can be defined in the deployment recipe, as shown here: role :web, "www.emporium.com" role :app, "app1.emporium.com", "app2.emporium.com" role :db, "db.emporium.com" Variables The lead developer of Capistrano and Rails core team member, Jamis Buck, embraced the familiar convention over configuration rule when writing Capistrano. For example, Subversion is the default version control system, but you can change it to any of the supported ones by modifying a variable in the deployment recipe. You can also declare your own variables and use them in custom tasks. For example, the following lines set the application name to Emporium and the Subversion repository URL to svn://localhost/emporium/trunk. set :application, "Emporium" set :repository, svn://localhost/emporium/trunk Capistrano comes with a set of predefined variables. The following are three of the more commonly used variables: application: The name of your application, such as Emporium. repository: The location of your application s source managed by a version control system, such as a Subversion URL: svn://localhost/emporium/trunk. user: The name to use when logging in to the remote server. Note that Capistrano uses the same name when logging in to all servers. This means that the user must exist on all servers. Tasks Capistrano has a set of built-in tasks that can be used to perform work on the remote server. The deploy task, for example, installs and deploys a new version of your application on the remote machine. The deploy task itself calls the restart task to restart FastCGI processes and other tasks to complete the deployment.
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CHAPTER 12 APPLICATION DEPLOYMENT
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You can also add your own custom tasks to the deployment recipe. Tasks are written in Ruby. For example, you could create a task that runs the mysqldump command on the remote machine, as shown in this example: task :backup_production_database do run "mysqldump uemporium phacked emporium_production >> /var/emporium/production_backup.sql" end You can get a list of all available tasks by executing rake remote:show_tasks. A task is run on all servers by default. Specify roles to run a task on a specific server or group of servers.
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Generating the Deployment Recipe
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The first thing you need to do is create the deployment recipe, by applying Capistrano to your application. To do this, execute the cap --apply-to command on your local machine: $ cap --apply-to /home/george/project/emporium Emporium exists create exists create config config/deploy.rb lib/tasks lib/tasks/capistrano.rake
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The command creates two files: deploy.rb is your deployment recipe, and capistrano.rake is an extension to rake that allows you to run all the tasks in your deployment recipe with rake. If you run rake -T now, you can see that Capistrano added a lot of new tasks, some of which are shown here: $ rake -T rake rake rake rake rake rake rake remote:cleanup remote:cold_deploy remote:deploy remote:deploy_with_migrations remote:diff_from_last_deploy remote:disable_web remote:enable_web
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CHAPTER 12 APPLICATION DEPLOYMENT
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Modifying the Deployment Recipe
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Now that you have the deployment recipe, you can start modifying it to fit your environment. First, set the required variables. Open config/deploy.rb in your editor and change the required variables section as shown here: # ============================================================================= # REQUIRED VARIABLES # ============================================================================= set :application, "emporium" set :repository, "svn://localhost/emporium/trunk" The application variable is used when creating the directory structure. The repository variable should be set to point to your Subversion repository. Next, define roles. Recall that we have the web, application, and database servers deployed on the same machine, so define the three different roles shown in this example (remember to change the IP address to fit your environment): # ============================================================================= # ROLES # ============================================================================= role :web, "192.168.0.1" role :app, "192.168.0.1" role :db, "192.168.0.1", :primary => true We can now target a command to be run on the web, application, or database server. We can also add servers to the environment, and the deployment of the application would still remain the same; only the configuration would change. For example, to add two more application servers to the environment, we might change the configuration as follows: role :app, "192.168.0.1", "192.168.0.11", "192.168.0.12" Also note that we have set the one and only database server to be the primary server, so that we can run migrations on it. Our particular production environment requires some modifications to the Capistrano default settings, so change the optional settings section as shown here: # ============================================================================= # OPTIONAL VARIABLES # ============================================================================= set :user, "rails" # defaults to the currently logged in user set :spinner_user, 'rails' set :svn_username, "svn" set :svn_password, "hacked"
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