我有一项服务，我想在以下情况下启动和停止我的服务：特定网络接口（eth0就我而言）会上升和下降。通过阅读文档和帖子，我来到了下面的单元，不幸的是，它不起作用。
澄清一下：我想要的是当eth0上升时my-service.service开始，当eth0下降时my-service.service停止。
有问题的接口由 管理systemd-networkd，具有静态 IP 和 DHCP 服务器。
是否有一个选项可以纯粹使用 systemd 来执行此操作，或者我唯一的选择是不同的服务，例如networkd-dispatcher？
该系统正在运行由 Yocto Project 制作的自定义发行版，具有systemd250.4 和由systemd-networkd.但我欢迎任何发行版的答案，因为它们可能会向我指出答案，或者对其他人有帮助。
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没有显示任何有趣的东西：
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
答案1
如果我理解正确的话，您想要一个网络已关闭的自定义通知吗？
不仅仅是在 my-service.service 中添加一个键“ExecStopPost”，它将指向您需要在服务关闭时运行的脚本/应用程序。
请阅读此处了解 .service 文件的完整说明： https://www.freedesktop.org/software/systemd/man/systemd.service.html