(1)如何自动清理老的release

capistrano 部署后自动清理老 release，默认只保留 5 个 releases

添加下面代码到 config/deploy.rb# if you want to clean up old releases on each deploy uncomment this:after "deploy:restart", "deploy:cleanup"

(2)如何人指定保留数量
如果想制定具体保留几个releases文件夹,设置保留数量，在 config/deploy.rb 中添加如下代码

set :keep_releases, 15
以上代码的含义是保留15次部署的releases