I have a service which I want to start and stop my service when a specific network interface (eth0 in my case) goes up and down. Reading through documentation, and posts, I have come to the unit below, which, unfortunately, does not work.
The interface in question is managed by systemd-networkd, has a static IP and a DHCP server.
Is there an option to do this purely with systemd, or is my only option a different service, such as networkd-dispatcher?
The system is running a custom distribution made with Yocto Project, with systemd 250.4 and networks managed by systemd-networkd. But I welcome answers from any distro, as they might point me to an answer, or be helpful to others.
my-service.service
[Unit]
BindsTo=sys-subsystem-net-devices-eth0.device
After=sys-subsystem-net-devices-eth0.device
BindsTo=nats.service
After=nats.service
BindsTo=postgresql.service
After=postgresql.service
[Service]
Type=simple
Restart=on-failure
EnvironmentFile=/opt/my/environment.txt
ExecStart=/opt/my/executable
[Install]
WantedBy=multi-user.target
systemctl list-units doesn't show anything interesting:
root@device:~# systemctl list-units | grep -i net
sys-devices-platform-bus\x405a000000-5a8e0000.can-net-can0.device loaded active plugged /sys/devices/platform/bus@5a000000/5a8e0000.can/net/can0
sys-devices-platform-bus\x405a000000-5a8f0000.can-net-can1.device loaded active plugged /sys/devices/platform/bus@5a000000/5a8f0000.can/net/can1
sys-devices-platform-bus\x405b000000-5b040000.ethernet-net-eth0.device loaded active plugged /sys/devices/platform/bus@5b000000/5b040000.ethernet/net/eth0
sys-devices-platform-bus\x405b000000-5b050000.ethernet-net-eth1.device loaded active plugged /sys/devices/platform/bus@5b000000/5b050000.ethernet/net/eth1
sys-subsystem-net-devices-can0.device loaded active plugged /sys/subsystem/net/devices/can0
sys-subsystem-net-devices-can1.device loaded active plugged /sys/subsystem/net/devices/can1
sys-subsystem-net-devices-eth0.device loaded active plugged /sys/subsystem/net/devices/eth0
sys-subsystem-net-devices-eth1.device loaded active plugged /sys/subsystem/net/devices/eth1
dhcpcd.service loaded active running A minimalistic network configuration daemon with DHCPv4, rdisc and DHCPv6 support
rdisc.service loaded active running Network Router Discovery Daemon
systemd-network-generator.service loaded active exited Generate network units from Kernel command line
systemd-networkd.service loaded active running Network Configuration
systemd-resolved.service loaded active running Network Name Resolution
systemd-timesyncd.service loaded active running Network Time Synchronization
xinetd.service loaded active running Xinetd A Powerful Replacement For Inetd
systemd-networkd.socket loaded active running Network Service Netlink Socket
network-pre.target loaded active active Preparation for Network
network.target loaded active active Network
nss-lookup.target loaded active active Host and Network Name Lookups
