Systemd Rails 启动脚本因 rbenv 失败，(code=exited, status=1/FAILURE)答案

【问题标题】：Systemd Rails boot script fails with rbenv, (code=exited, status=1/FAILURE)Systemd Rails 启动脚本因 rbenv 失败，(code=exited, status=1/FAILURE)
【发布时间】：2019-04-03 18:13:14
【问题描述】：

在创建 systemd 服务以启动 rails 应用程序后，该服务因以下错误而失败：

$ systemctl status evrserver
● evrserver.service - evr server boot
   Loaded: loaded (/etc/systemd/system/evrserver.service; enabled; vendor preset: enabled)
   Active: activating (auto-restart) (Result: exit-code) since Wed 2019-04-03 18:34:22 BST; 2min 51s ago
  Process: 425 ExecStart=/home/pi/.rbenv/bin/rbenv bundle exec rails s -b 192.168.1.66 (code=exited, status=1/FAILURE)
   CGroup: /system.slice/evrserver.service

Apr 03 18:34:22 raspberrypi systemd[1]: Failed to start evr server boot.
Apr 03 18:34:22 raspberrypi systemd[1]: evrserver.service: Unit entered failed state.
Apr 03 18:34:22 raspberrypi systemd[1]: evrserver.service: Failed with result 'exit-code'.

根据其他在线教程设置 systemd 在 rbenv 托管环境中启动 rails 应用程序，如下所述：

https://gist.github.com/arteezy/5d53d99f6ee617fae1f0db0576fdd418

https://mikewilliamson.wordpress.com/2015/08/26/running-a-rails-app-with-systemd-and-liking-it/

这里是服务文件：

[Unit]
Description=evr server boot
After=network.target
After=local-fs.target

[Service]
Type=forking
User=pi
Group=pi
WorkingDirectory=/home/pi/evr
ExecStart=/home/pi/.rbenv/bin/rbenv bundle exec rails s -b 192.168.1.66
TimeoutSec=180
RestartSec=180s
Restart=always

[Install]
WantedBy=multi-user.target

此设备还有另外两个服务，它们是自定义实现，可以正常工作，都是非 Rails 进程。我在这里缺少什么来运行 rails 服务？

【问题讨论】：

标签： ruby-on-rails raspbian systemd rbenv ruby-on-rails-6

【解决方案1】：

啊，有点意思。它总是小事，是吗？在 bundle 之前忘记了 exec 并且类型需要简单而不是分叉。

[Unit]
Description=evr server boot
After=network.target
After=local-fs.target

[Service]
Type=simple
User=pi
Group=pi
WorkingDirectory=/home/pi/evr
ExecStart=/home/pi/.rbenv/bin/rbenv exec bundle exec rails s -b 192.168.1.66
TimeoutSec=180
RestartSec=180s
Restart=always

[Install]
WantedBy=multi-user.target

和成功的日志：

● evrserver.service - evr server boot
   Loaded: loaded (/etc/systemd/system/evrserver.service; enabled; vendor preset: enabled)
   Active: active (running) since Thu 2019-04-04 04:05:45 BST; 8min ago
 Main PID: 460 (ruby)
   CGroup: /system.slice/evrserver.service
           └─460 puma 3.12.0 (tcp://192.168.1.66:3000) [evr]

Apr 04 04:05:45 raspberrypi systemd[1]: Started evr server boot.
Apr 04 04:06:08 raspberrypi rbenv[460]: => Booting Puma
Apr 04 04:06:08 raspberrypi rbenv[460]: => Rails 6.0.0.beta3 application starting in development
Apr 04 04:06:08 raspberrypi rbenv[460]: => Run `rails server --help` for more startup options
Apr 04 04:13:51 raspberrypi rbenv[460]: Puma starting in single mode...
Apr 04 04:13:51 raspberrypi rbenv[460]: * Version 3.12.0 (ruby 2.6.2-p47), codename: Llamas in Pajamas
Apr 04 04:13:51 raspberrypi rbenv[460]: * Min threads: 5, max threads: 5
Apr 04 04:13:51 raspberrypi rbenv[460]: * Environment: development
Apr 04 04:13:51 raspberrypi rbenv[460]: * Listening on tcp://192.168.1.66:3000
Apr 04 04:13:51 raspberrypi rbenv[460]: Use Ctrl-C to stop

【讨论】：