# Systemd

> Source: https://www.ymotongpoo.com/works/adopting-erlang-ja/systemd/


## Systemdユニット

```shell
[Unit]
Description=Service Discovery Runner
After=network.target

[Service]
WorkingDirectory=/opt/service_discovery
EnvironmentFile=/etc/default/service_discovery.env
ExecStart=/opt/service_discovery/bin/service_discovery foreground
Restart=on-failure
Environment=RELX_OUT_FILE_PATH=/tmp/
Environment=COOKIE=service_discovery_cookie

[Install]
WantedBy=multi-user.target
```

OTP 19.3以降、`SIGTERM` シグナルによってOTPのVMはグレースフルシャットダウンします。

```shell
journalctl service_discovery
```