systemd service depending on a network interface

systemd systemd-unit systemd-service network

Source

• https://unix.stackexchange.com/a/227768

• use BindsTo= and After= in the [Unit] section and WantedBy= in [Install]

  [Unit]
  Description=Service depending on interface %I
  Wants=network-online.target
  BindsTo=sys-subsystem-net-devices-%i.device
  After=multi-user.target sys-subsystem-net-devices-%i.device network-online.target
   
  [Service]
  Type=simple
  ExecStart=...
   
  [Install]
  WantedBy=default.target sys-subsystem-net-devices-%i.device

• use Wants=network-online.target and After=network-online.target to actually wait for the network to be online

  network-online.service unit does not monitor the online state of the system!

  This only works as a one-time concept during system start-up. The