使用 EC2 + Rails + Nginx + Capistrano 重启时 Puma 重启失败

Question

我已成功使用 capistrano 将我的 rails 应用程序部署到 Ubuntu EC2。部署时一切正常。Rails 应用程序名称是 deseov12 我的问题是 Puma 不会在启动时启动，这是必要的，因为生产 EC2 实例将按需实例化。Puma 会在通过 Capistrano 部署时启动，它也会在运行时启动

cap production puma:start

在本地机器上。

如果我运行以下命令，它也会在重新启动后在服务器上启动：

su - deploy
[enter password]
cd /home/deploy/deseov12/current && ( export RACK_ENV="production" ; ~/.rvm/bin/rvm ruby-2.2.4 do bundle exec puma -C /home/deploy/deseov12/shared/puma.rb --daemon )

我已按照 Puma 丛林工具的指示使用 upstart 使 Puma 在启动时启动，如下所示：

/etc/puma.conf 的内容

/home/deploy/deseov12/current

/etc/init/puma.conf 和 /home/deploy/puma.conf 的内容

# /etc/init/puma.conf - Puma config

# This example config should work with Ubuntu 12.04+.  It
# allows you to manage multiple Puma instances with
# Upstart, Ubuntu's native service management tool.
#
# See workers.conf for how to manage all Puma instances at once.
#
# Save this config as /etc/init/puma.conf then manage puma with:
#   sudo start puma app=PATH_TO_APP
#   sudo stop puma app=PATH_TO_APP
#   sudo status puma app=PATH_TO_APP
#
# or use the service command:
#   sudo service puma {start,stop,restart,status}
#

description "Puma Background Worker"

# no "start on", we don't want to automatically start
stop on (stopping puma-manager or runlevel [06])

# change apps to match your deployment user if you want to use this as a less privileged user $
setuid deploy
setgid deploy

respawn
respawn limit 3 30

instance ${app}

script
# this script runs in /bin/sh by default
# respawn as bash so we can source in rbenv/rvm
# quoted heredoc to tell /bin/sh not to interpret
# variables

# source ENV variables manually as Upstart doesn't, eg:
#. /etc/environment

exec /bin/bash <<'EOT'
# set HOME to the setuid user's home, there doesn't seem to be a better, portable way
  export HOME="$(eval echo ~$(id -un))"

  if [ -d "/usr/local/rbenv/bin" ]; then
    export PATH="/usr/local/rbenv/bin:/usr/local/rbenv/shims:$PATH"
  elif [ -d "$HOME/.rbenv/bin" ]; then
    export PATH="$HOME/.rbenv/bin:$HOME/.rbenv/shims:$PATH"
  elif [ -f  /etc/profile.d/rvm.sh ]; then
    source /etc/profile.d/rvm.sh
  elif [ -f /usr/local/rvm/scripts/rvm ]; then
    source /etc/profile.d/rvm.sh
  elif [ -f "$HOME/.rvm/scripts/rvm" ]; then
    source "$HOME/.rvm/scripts/rvm"
  elif [ -f /usr/local/share/chruby/chruby.sh ]; then
    source /usr/local/share/chruby/chruby.sh
    if [ -f /usr/local/share/chruby/auto.sh ]; then
      source /usr/local/share/chruby/auto.sh
    fi
    # if you aren't using auto, set your version here
    # chruby 2.0.0
  fi

  cd $app
  logger -t puma "Starting server: $app"

  exec bundle exec puma -C current/config/puma.rb
EOT
end script

/etc/init/puma-manager.conf 和 /home/deploy/puma-manager.conf 的内容

# /etc/init/puma-manager.conf - manage a set of Pumas

# This example config should work with Ubuntu 12.04+.  It
# allows you to manage multiple Puma instances with
# Upstart, Ubuntu's native service management tool.
#
# See puma.conf for how to manage a single Puma instance.
#
# Use "stop puma-manager" to stop all Puma instances.
# Use "start puma-manager" to start all instances.
# Use "restart puma-manager" to restart all instances.
# Crazy, right?
#

description "Manages the set of puma processes"

# This starts upon bootup and stops on shutdown
start on runlevel [2345]
stop on runlevel [06]

# Set this to the number of Puma processes you want
# to run on this machine
env PUMA_CONF="/etc/puma.conf"

pre-start script
  for i in `cat $PUMA_CONF`; do
  app=`echo $i | cut -d , -f 1`
  logger -t "puma-manager" "Starting $app"
  start puma app=$app
done
end script

/home/deploy/deseov12/shared/puma.rb 的内容

#!/usr/bin/env puma

directory '/home/deploy/deseov12/current'
rackup "/home/deploy/deseov12/current/config.ru"
environment 'production'

pidfile "/home/deploy/deseov12/shared/tmp/pids/puma.pid"
state_path "/home/deploy/deseov12/shared/tmp/pids/puma.state"
stdout_redirect '/home/deploy/deseov12/shared/log/puma_error.log', '/home/deploy/deseov12/shar$


threads 0,8

bind 'unix:///home/deploy/deseov12/shared/tmp/sockets/puma.sock'

workers 0

activate_control_app

prune_bundler


on_restart do
  puts 'Refreshing Gemfile'
  ENV["BUNDLE_GEMFILE"] = "/home/deploy/deseov12/current/Gemfile"
end

但是，我无法在服务器重新启动后让 Puma 自动启动。它只是没有开始。

我当然会感谢一些帮助

编辑：我刚刚注意到一些可能是线索的东西：

以部署用户身份运行以下命令时：

sudo start puma app=/home/deploy/deseov12/current

ps aux 将显示 puma 进程几秒钟后消失。

deploy    4312  103  7.7 183396 78488 ?        Rsl  03:42   0:02 puma 2.15.3 (tcp://0.0.0.0:3000) [20160106224332]

这个puma流程与capistrano推出的工作流程不同：

deploy    5489 10.0 12.4 858088 126716 ?       Sl   03:45   0:02 puma 2.15.3 (unix:///home/deploy/deseov12/shared/tmp/sockets/puma.sock) [20160106224332]

Answer 1

经过大量研究，终于解决了这个问题。事实证明，问题是三重的：

1) 运行 upstart 脚本时没有设置正确的环境 2) 使用 capistrano 时的实际生产 puma.rb 配置文件可以在 home/deploy/deseov12/shared 目录中找到，而不是在 /current/ 目录中 3) 没有正确妖魔化美洲狮服务器

要解决这些问题：

1) 此行应添加到 /etc/init/puma.conf 和 /home/deploy/puma.conf 中脚本的开头：

env RACK_ENV="production"

2) 和 3) 这条线

exec bundle exec puma -C current/config/puma.rb

应该换成这个

exec bundle exec puma -C /home/deploy/deseov12/shared/puma.rb --daemon

执行此操作后，puma 服务器会在重新启动或新实例生成时正常启动。希望这可以帮助人们避免数小时的故障排除。