Capistrano在使用Amazon RDS部署时超时

Question

我似乎无法让Capistrano与AmazonRDS良好地配合。我已经找遍了各地的任何信息正确设置，但没有找到任何。现在，当我cap deploy，过程超时。

这是我deploy.rb：

set :deploy_to, "/opt/bitnami/apps/annarbortshirtcompany.com/cms/" 
set :scm, :git 
set :repository, "ssh://user@ec2-repository.compute-1.amazonaws.com/~/repo/cms.git" 
set :deploy_via, :remote_cache 

set :user, "user" 
ssh_options[:keys] = [File.join(ENV["HOME"], "EC2", "admin.pem")] 
ssh_options[:forward_agent] = true 
set :branch, "master" 
set :use_sudo, true 

set :location, "ec2-webserver.compute-1.amazonaws.com" 
role :web, location 
role :app, location 
role :db, "cmsinstance.c7r8frl6npxn.us-east-1.rds.amazonaws.com", :primary => true 

# If you are using Passenger mod_rails uncomment this: 
namespace :deploy do 
    task :start do ; end 
    task :stop do ; end 
    task :restart, :roles => :app, :except => { :no_release => true } do 
    run "#{try_sudo} touch #{File.join(current_path,'tmp','restart.txt')}" 
    end 
end 

的RDS数据库实例的用户名不同于SSH用户名在这里设置，但在我的database.yml定义。我认为这可能不是由capistrano读取的，但不知道如何做到这一点。

当我的“帽子部署”：

ubuntu@ubuntu-VirtualBox:~/RailsApps/cms$ cap deploy 
    * executing `deploy' 
    * executing `deploy:update' 
** transaction: start 
    * executing `deploy:update_code' 
    updating the cached checkout on all servers 
    executing locally: "git ls-remote ssh://user@ec2-repository.compute-1.amazonaws.com/~/repo/cms.git master" 
    command finished in 1590ms 
    * executing "if [ -d /app-directory/shared/cached-copy ]; then cd /app-directory/shared/cached-copy && git fetch -q origin && git fetch --tags -q origin && git reset -q --hard ffc4ec7762566f801c4a9140aa3980dc71e3d06f && git clean -q -d -x -f; else git clone -q ssh://user@ec2-repository.amazonaws.com/~/repo/cms.git /app-directory/shared/cached-copy && cd /app-directory/shared/cached-copy && git checkout -q -b deploy ffc4ec7762566f801c4a9140aa3980dc71e3d06f; fi" 
    servers: ["ec2-webserver.compute-1.amazonaws.com", "dbinstance.us-east1.rds.amazonaws.com"] 
*** [deploy:update_code] rolling back 
    * executing "rm -rf /app-directory/releases/20110607161612; true" 
    servers: ["ec2-webserver.compute-1.amazonaws.com", "dbinstance.us-east1.rds.amazonaws.com"] 
** [deploy:update_code] exception while rolling back: Capistrano::ConnectionError, connection failed for: dbinstance.us-east1.rds.amazonaws.com (Errno::ETIMEDOUT: Connection timed out - connect(2)) 
    connection failed for: dbinstance.us-east1.rds.amazonaws.com (Errno::ETIMEDOUT: Connection timed out - connect(2)) 

它为什么要“更新所有服务器上的缓存结账”？现在甚至不需要数据库服务器。我很难理解如何解决这个问题。希望有人能指出我正确的方向！

Answer 1

我有这个确切的问题，并为我尴尬的说是一个好的5或6个小时挣扎。最后，当我意识到问题出在什么地方时，我觉得自己在sma myself自己，因为我知道这一次，但却忘记了它。下面是问题的症结所在，从deploy.rb的这一部分：

set :location, "ec2-webserver.compute-1.amazonaws.com" 
role :web, location 
role :app, location 
role :db, "cmsinstance.c7r8frl6npxn.us-east-1.rds.amazonaws.com", :primary => true 

当你定义Capistrano的机器的角色，您实际上并不确定哪些机器将发挥特殊作用......相反，您正在识别，在应用角色的部署配方时，Capistrano代码将在哪些机器上运行。所以，当你定义：db角色时，你想指向你的EC2实例，而不是的RDS实例。你不能进入RDS机器，所以Capistrano不可能在那里运行配方。相反，点：DB为你指点在同一台机器：网站和：应用程序，即

set :location, "ec2-webserver.compute-1.amazonaws.com" 
role :web, location 
role :app, location 
role :db, location, :primary => true 

怎样的RDS的机器，那么有任何牵连？那么，这是database.yml文件，它指示哪台机器实际上正在运行需要执行SQL的RDBMS。您只需确保您为目标数据库设置主机值：例如：

production: 
    adapter: mysql2 
    encoding: utf8 
    reconnect: false 
    database: <your_db>_production 
    pool: 5 
    username: <username> 
    password: <password> 
    host: cmsinstance.c7r8frl6npxn.us-east-1.rds.amazonaws.com 

是否有意义？

我希望这救了别人我遇到的挫折。

• 大卫