At work we mostly run Centos and I have some NodeJS services to deploy. I feel most familiar with Ubuntu / Upstart so this post serves as my notes on systemd.
In this contrived example, we define a service for our taco-api application. The taco-api source code lives in /opt/taco-api.
We manage a static .service file using a package or config management.
[Unit] Description=Node.js service for taco API [Service] Environment=NODE_ENV=development ExecStart=/usr/bin/node /opt/taco-api/app.js # Restart service after all crashes but wait 10 seconds between restarts. Restart=always RestartSec=10 # output stdout and stderr to syslog. (/var/log/messages) StandardOutput=syslog StandardError=syslog SyslogIdentifier=taco-api # define the user and group to own the process. #User=node #Group=node # change directory before running ExecStart command. WorkingDirectory=/opt/taco-api [Install] WantedBy=multi-user.target
We also manage a static override.conf file using config management. In this file, we customize the environment variables present.
This allows us to only override and keep track of the deltas.
You can test, like this:
# emit the status of the service. service taco-api status # start the service. service taco-api start # look at the process list, note that node is running. ps aux | grep node # emit the status of the service. service taco-api status # start the service. service taco-api stop # look at the process list, note that node is not running. ps aux | grep node