Simple generic service file#
/etc/systemd/system/foo.service
[Unit]
Description=Foo
After=network-online.target
Wants=network-online.target
[Service]
Type=simple
EnvironmentFile=-/etc/sysconfig/foo
LimitNOFILE=1024
PIDFile=/var/run/foo/running.pid
ExecStart=/bin/foo start
ExecStop=/bin/foo stop
KillSignal=SIGTERM
Restart=on-abort
User=nobody
Group=nobody
PermissionsStartOnly=true
ExecStartPre=/bin/mkdir -p /var/log/foo
ExecStartPre=/bin/chown root:adm /var/log/foo
ExecStartPre=/bin/chmod 755 /var/log/foo
RestartSec=9
StandardOutput=syslog
StandardError=syslog
SyslogIdentifier=foo
[Install]
WantedBy=multi-user.target
Mappings of limits#
Credits to this StackOverflow answer!
| Directive | ulimit equivalent | Unit |
|---|---|---|
| LimitCPU= | ulimit -t | Seconds |
| LimitFSIZE= | ulimit -f | Bytes |
| LimitDATA= | ulimit -d | Bytes |
| LimitSTACK= | ulimit -s | Bytes |
| LimitCORE= | ulimit -c | Bytes |
| LimitRSS= | ulimit -m | Bytes |
| LimitNOFILE= | ulimit -n | Number of File Descriptors |
| LimitAS= | ulimit -v | Bytes |
| LimitNPROC= | ulimit -u | Number of Processes |
| LimitMEMLOCK= | ulimit -l | Bytes |
| LimitLOCKS= | ulimit -x | Number of Locks |
| LimitSIGPENDING= | ulimit -i | Number of Queued Signals |
| LimitMSGQUEUE= | ulimit -q | Bytes |
| LimitNICE= | ulimit -e | Nice Level |
| LimitRTPRIO= | ulimit -r | Realtime Priority |
| LimitRTTIME= | No equivalent |
ulimit -c unlimited is the same as LimitCORE=infinity
ulimit -v unlimited is the same as LimitAS=infinity
ulimit -m unlimited is the same as LimitRSS=infinity
Interact with systemd#
Reload changes
systemctl daemon-reload
List unit files
systemctl list-unit-files [--state=[LODA|SUB|ACTIVE|failed]]
Enable/Disable unit
systemctl enable|disable FOO
Edit unit file
systemctl edit --full FOO # or just by directly editing the file
Start/Stop/Reload/Restart
systemctl start/stop/reload/restart FOO