用capistrano写一个简略的deploy脚本

用capistrano写一个简单的deploy脚本
源：http://blog.csdn.net/largetalk/article/details/6743090

setp 1:

           gem install capistrano           gem install capistrano-ext

setp 2:  在项目根目录执行

capify .

   这将在根目录创建Capfile 和 config目录下创建deploy.rb 文件


setp 3: 编辑deploy.rb

require 'bundler/capistrano'     #添加之后部署时会调用bundle install， 如果不需要就可以注释掉  require "capistrano/ext/multistage"     #多stage部署所需      set :stages, %w(development production)  set :default_stage, "development"      set :application, "crm_app_end"   #应用名称  set :repository,  "https://chang.abc.com/svn/engineering/vwaccount/mydeploy/trunk"     set :keep_releases, 5          #只保留5个备份      set :deploy_to, "/var/www/#{application}"  #部署到远程机器的路径  set :user, "user1"              #登录部署机器的用户名  set :password, "user1"      #登录部署机器的密码， 如果不设部署时需要输入密码      default_run_options[:pty] = true          #pty: 伪登录设备  #default_run_options[:shell] = false     #Disable sh wrapping      set :use_sudo, true                            #执行的命令中含有sudo， 如果设为false， 用户所有操作都有权限  set :runner, "user2"                          #以user2用户启动服务  set :svn_username, "xxxx"           set :scm, :subversion                        #  # Or: `accurev`, `bzr`, `cvs`, `darcs`, `git`, `mercurial`, `perforce`, `subversion` or `none`                     #set :deploy_via, :copy                     #如果SCM设为空， 也可通过直接copy本地repo部署      #set :domain, "crm.abc.com"    #custom define      role :web, "192.168.0.13", "192.168.0.117"                          # Your HTTP server, Apache/etc  role :app, "192.168.0.13", "192.168.0.117"                          # This may be the same as your `Web` server  role :db,  "192.168.0.13", :primary => true # This is where Rails migrations will run  #role :db,  "your slave db-server here"  #            namespace :deploy do          desc "remove and destory this app"      task :destory, :roles => :app do          run "cd #{deploy_to}/../ && #{try_sudo} mv #{application} /tmp/#{application}_#{Time.now.strftime('%Y%d%m%H%M%S')}"      #try_sudo 以sudo权限执行命令      end          after "deploy:update", "deploy:shared:setup"              #after， before 表示在特定操作之后或之前执行其他任务          namespace :shared do          desc "setup shared folder symblink"          task :setup do              run "cd #{deploy_to}/current; rm -rf shared; ln -s #{shared_path} ."               end      end          after "deploy:setup", "deploy:setup_chown"      desc "change owner from root to user1"      task :setup_chown do          run "cd #{deploy_to}/../ && #{try_sudo} chown -R #{user}:#{user} #{application}"      end            task :start do         run "cd #{deploy_to}/current && ./crmd.sh start"         #try_sudo "cd #{deploy_to}/current && ./restart.sh"      end          task :stop do         run "cd #{deploy_to}/current && ./crmd.sh stop"      end          task :restart do         run "cd #{deploy_to}/current && ./crmd.sh restart"      end        end  

setup 4: 在项目根目录执行 
          

               cap deploy:setup #建立部署路径             cap deploy:update #部署             cap deploy:start    #启动服务             cap deploy:stop   #停止服务             cap deploy:restart #重启服务

setup 5: 如果有多个stage要部署，则在config下创建deploy文件夹， 在该文件夹下有各stages文件, 文件名和 set :stages, %w(development production) 对应， 如development.rb production.rb，在各文件中设置相应变量即可， 然后可用 cap production deploy:... 来执行对应production的操作


其实capistrano最终都是转变成shell命令来完成任务的， 所以纯粹用shell脚本也可以完成相应功能， 但相对于晦涩的shell命令， capistrano明显更好懂， 并且它有很多默认操作非常好用， 比如setup， update， 如果自己用shell来实现非常麻烦， capistrano允许在脚本中嵌入shell， 比如上面的start， restart等， 这非常方便， 很多capistrano做不到的就可以用shell去搞定了
这事最近又有了新进展，我在一个django项目中用capistrano来发布，虽然python下也有一个叫fabric的东西，但那个还不熟，先用这个，有时间学习一下fabric再说

require 'bundler/capistrano'     #添加之后部署时会调用bundle install， 如果不需要就可以注释掉   

#require "capistrano/ext/multistage"     #多stage部署所需        set :application, "app"   #应用名称    set :scm, :subversion                          set :repository,  "svn://0.0.0.0/trunk/src"           set :keep_releases, 5          #只保留5个备份        set :deploy_to, "/var/www/#{application}"  #部署到远程机器的路径    set :user, "xxx"              #登录部署机器的用户名    set :password, "xxxxx"      #登录部署机器的密码， 如果不设部署时需要输入密码        default_run_options[:pty] = true          #pty: 伪登录设备    #default_run_options[:shell] = false     #Disable sh wrapping        #set :use_sudo, true                            #执行的命令中含有sudo， 如果设为false， 用户所有操作都有权限    set :runner, "xxxx"                          #以用户启动服务                           #set :deploy_via, :copy                     #如果SCM设为空， 也可通过直接copy本地repo部署       role :web, "172.16.120.222"#, "192.168.0.117"                          # Your HTTP server, Apache/etc    role :app, "172.16.120.222"#, "192.168.0.117"                          # This may be the same as your `Web` server    role :db,  "172.16.120.222", :primary => true # This is where Rails migrations will run    #role :db,  "your slave db-server here"    #              namespace :deploy do                desc "remove and destory this app"        task :destory, :roles => :app do            run "cd #{deploy_to}/../ && #{try_sudo} mv #{application} /tmp/#{application}_#{Time.now.strftime('%Y%d%m%H%M%S')}"      #try_sudo 以sudo权限执行命令        end          #    after "deploy:setup", "deploy:setting_link"  #    desc "symlink for settings.py"  #    task :setting_link do  #        run "cd #{deploy_to}; #{try_sudo} touch current; #{try_sudo} ln -s current releases/#{application}"  #    end          after "deploy:update", "deploy:shared:setup"              #after， before 表示在特定操作之后或之前执行其他任务            namespace :shared do            desc "setup shared folder symblink"            task :setup do              run "cd #{deploy_to}/current; ln -s #{shared_path} x"                     run "cd #{deploy_to}/current; rm -rf log; ln -s #{shared_path}/log log"                     run "cd #{deploy_to}/releases; rm -f #{application} &&  __realversion__=`realpath ../current` && ln -s $__realversion__ #{application}"          end        end            after "deploy:setup", "deploy:setup_chown"        desc "change owner from root to user1"        task :setup_chown do            run "cd #{deploy_to}/../ && #{try_sudo} chown -R #{user}:#{user} #{application}"        end           task :default do           transaction do               update_code              symlink          end      end       task :update_code, :except => { :no_release => true } do           on_rollback { run "rm -rf #{release_path}; true" }           strategy.deploy!       end       before "deploy:rollback", "deploy:clean_adaptive"     task :clean_adaptive do          run "cd #{deploy_to}/releases; rm -f #{application}"     end                   after "deploy:rollback", "deploy:rollback_set"     task :rollback_set do          run "cd #{deploy_to}/releases; rm -f #{application} &&  __realversion__=`realpath ../current` && ln -s $__realversion__ #{application}"     end          task :start do           run "cd #{deploy_to}/current && ./adaptive_pool.sh start"           run "cd #{deploy_to}/current && ./adaptive_exam.sh start"         end                task :stop do           run "cd #{deploy_to}/current && ./adaptive_pool.sh stop"           run "cd #{deploy_to}/current && ./adaptive_exam.sh stop"        end                task :restart do           run "cd #{deploy_to}/current && ./adaptive_pool.sh restart"           run "cd #{deploy_to}/current && ./adaptive_exam.sh restart"        end            end    

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