Systemd

Usage

• systemd:0 means first systemd socket defined in the .socket file (FD 3), systemd:1 is the second (FD 4) and so on.

Configure a service to start at boot

sudo systemctl enable courier-authdaemon

Create a new service

From SE:

• Create a file /etc/systemd/system/foo.service

[Unit]
Description=foo

[Service]
ExecStart=/bin/bash -c "while true; do /bin/inotifywait -qq --event close_write /sys/class/backlight/acpi_video0/brightness; su myusername -c '/bin/xbacklight -display :0 -set $(cat /sys/class/backlight/acpi_video0/brightness)'; done"

[Install]
WantedBy=multi-user.target

Reload systemd:

systemctl daemon-reload

Enable the new service:

systemctl enable foo

The service will start automatically at boot. To start it immediately:

systemctl start foo
systemctl status foo # optional, just to verify

Example of options to add in the service file:

[Unit]
Description=rapid spam filtering system
After=nss-lookup.target

[Service]
ExecStart=/usr/bin/rspamd -c /etc/rspamd/rspamd.conf -f
User=_rspamd
RuntimeDirectory=rspamd
RuntimeDirectoryMode=0755
Restart=always

[Install]
WantedBy=multi-user.target