Ubuntu k3s manual registration as daemon

_etc_systemd_system_k3s-agent.service

[Unit]
Description=K3s Agent start
# After=network.target
# After=systemd-user-sessions.service
# After=network-online.target

[Service]
User=root
# Type=simple
# PIDFile=/run/my-service.pid
ExecStart=/usr/local/bin/k3s agent -c /etc/rancher/k3s/agent/config.yaml
# ExecReload=/home/transang/startup.sh reload
# ExecStop=/home/transang/startup.sh stop
# TimeoutSec=30
Restart=on-failure
RestartSec=30
# StartLimitInterval=350
# StartLimitBurst=10

[Install]
WantedBy=multi-user.target

_etc_systemd_system_k3s-server.service

[Unit]
Description=K3s Server start
# After=network.target
# After=systemd-user-sessions.service
# After=network-online.target

[Service]
User=root
# Type=simple
# PIDFile=/run/my-service.pid
ExecStart=/usr/local/bin/k3s server -c /etc/rancher/k3s/master/config.yaml
# ExecReload=/home/transang/startup.sh reload
# ExecStop=/home/transang/startup.sh stop
# TimeoutSec=30
Restart=on-failure
RestartSec=30
# StartLimitInterval=350
# StartLimitBurst=10

[Install]
WantedBy=multi-user.target

REAME.md

You can now start/stop this service with: systemctl start my-service / systemctl stop my-service. To enable this service when startup, run systemctl enable my-service.

References: https://transang.me/create-startup-scripts-in-ubuntu/