So, you try to setup an agent, and instead of getting a nice package or anything, you get told, “run this long java command line app” …. wat. Here’s a (very) basic system unit file to run your agent. You can copy the command lines from what jenkins provides itself.
$ cat /etc/systemd/system/jenkins-agent.service
[Unit]
Description=My radical Jenkins agent
Wants=network-online.target
After=network-online.target
[Service]
ExecStart=/usr/bin/java -jar /var/opt/jenkins-agent/agent.jar -jnlpUrl https://radical.example.org/computer/blah/slave-agent.jnlp -secret @/var/opt/jenkins-agent/my.jenkins.secret-file -workDir /var/opt/jenkins-agent
Restart=always
RestartSec=10
[Install]
WantedBy=multi-user.target
(And remember, JDK8 for your agent, until https://issues.jenkins-ci.org/browse/JENKINS-63313 is fixed)
Then, just systemctl enable jenkins-agent and systemctl start jenkins-agent.
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