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Main / Systemd
In 2021, systemd is considered the newer service control methodology for various Linux distros. It replaces initd. Create a .service file for your service in /etc/systemd/system. Here is a working example that runs socat:
[Unit]
Description=automation of socat forwarders with relayd
After=network.target
StartLimitIntervalSec=0
[Service]
Environment="FMS_PLAT_UDPPORT=3996"
Environment="PLAT_FWD_UDPPORT=3998"
#Airbus FMS machine IP
Environment="FMS_IPADDR=127.0.0.1"
#which interface to use on this machine for connecting to Foo network
Environment="FOO_LOCAL_IPADDR=127.0.0.1"
#which interface to use on this machine for connecting to Bar network
Environment="BAR_LOCAL_IPADDR=127.0.0.1"
User=optimus
WorkingDirectory=/home/optimus
Restart=always
RestartSec=5
Type=simple
#Type=oneshot
#Type=forking
ExecStart=socat -d -d UDP-LISTEN:${PLAT_FWD_UDPPORT},bind=${AAC_LOCAL_IPADDR},fork,reuseaddr UDP:${FMS_IPADDR}:${FMS_PLAT_UDPPORT},bind=${AIRBUS_LOCAL_IPADDR}
[Install]
WantedBy=multi-user.target
Whenever you make a change to a service file, run systemctl daeomon-reload to pick up changes to the system folder. You can then run with sudo systemctl start <myservname>.service and read logs with sudo journalctl -f -u <myservname>.service |