如何让使用 Puma 和 Capistrano 部署的 Rails 应用程序在重启时启动

Question

我已经成功地使用 Capistrano 部署了 Rails 4、Puma、Nginx 应用程序。当我部署cap production deploy 时，一切正常。我的问题是如果服务器由于某种原因重新启动或崩溃，它不会重新启动。

我在 DigitalOcean 上使用 Debian 8。似乎 Debian 8 使用了systemd，所以我按照Puma 的说明进行操作，但它没有用。经过一番研究，我发现了更多脚本，其中最明智的一个是：

[Unit]
Description=Rails-Puma Webserver

[Service]
Type=simple
User=myuser
WorkingDirectory=/home/myuser/apps/myapp
ExecStart=/home/myuser/.rvm/rubies/ruby-2.2.2/bin/systemd_rails server -e production
TimeoutSec=15
Restart=always

[Install]
WantedBy=multi-user.target

我已经将上面的文件保存在/etc/systemd/system/rails-puma.service 然后我启用它：sudo systemctl enable rails.service 最后启动它：sudo systemctl start rails-puma.service

不幸的是，这没有奏效。这是sudo systemctl status rails-puma.service的结果：

    ● rails-puma.service - Rails-Puma Webserver
   Loaded: loaded (/etc/systemd/system/rails-puma.service; enabled)
   Active: failed (Result: start-limit) since Thu 2016-07-07 12:11:58 EDT; 4s ago
  Process: 4373 ExecStart=/home/myuser/.rvm/rubies/ruby-2.2.2/bin/systemd_rails server -e production (code=exited, status=203/EXEC)
 Main PID: 4373 (code=exited, status=203/EXEC)

Jul 07 12:11:58 mrcProd systemd[1]: rails-puma.service: main process exited, code=exited, status=203/EXEC
Jul 07 12:11:58 mrcProd systemd[1]: Unit rails-puma.service entered failed state.
Jul 07 12:11:58 mrcProd systemd[1]: rails-puma.service start request repeated too quickly, refusing to start.
Jul 07 12:11:58 mrcProd systemd[1]: Failed to start Rails-Puma Webserver.
Jul 07 12:11:58 mrcProd systemd[1]: Unit rails-puma.service entered failed state.

我在这里做错了什么？

Answer 1

我有类似的服务，但我声明的略有不同/etc/systemd/system/puma.service

[Unit]
Description=Puma Control
After=network.target auditd.service

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/etc/puma/puma-start
ExecStop=/etc/puma/puma-stop

[Install]
WantedBy=multi-user.target

然后在/etc/puma/puma-start

#!/bin/bash -

cd /home/changeuser/apps/changeapp/current && ( export RACK_ENV="production" ; /home/changeuser/.rvm/bin/rvm default do bundle exec puma -C /home/changeuser/apps/changeapp/shared/puma.rb --daemon )

在/etc/puma/puma-stop

#!/bin/bash -

cd /home/changeuser/apps/changeapp/current && ( export RACK_ENV="production" ; /home/changeuser/.rvm/bin/rvm default do bundle exec pumactl -S /home/changeuser/apps/changeapp/shared/tmp/pids/puma.state stop )

记得设置后执行

chmod +x /etc/puma/puma-start
chmod +x /etc/puma/puma-stop
systemctl enable puma

然后去测试

systemctl start puma
systemctl stop puma
systemctl restart puma
systemctl status puma