求助：启动器从 openrc 切换到 systemd，因 systemd-networkd 配置网络，导致 dnsmasq 启动失败！

如标题所述，自启动 dnsmasq 会失败，进入系统后手动启动 dnsmasq 服务则一切正常。根据错误提示：

3 月 08 20:24:56 LINUX systemd[1]: Starting A lightweight DHCP and caching DNS server...

3 月 08 20:24:56 LINUX dnsmasq[228]: dnsmasq: syntax check OK.

3 月 08 20:24:56 LINUX systemd[1]: Started A lightweight DHCP and caching DNS server.

3 月 08 20:24:56 LINUX dnsmasq[232]: dnsmasq: failed to create listening socket for 10.0.1.1: 无法指定被请求的地址

3 月 08 20:24:56 LINUX systemd[1]: dnsmasq.service: Main process exited, code=exited,，status=2/INVALIDARGUMENT

3 月 08 20:24:56 LINUX systemd[1]: dnsmasq.service: Failed with result 'exit-code'.

可知，是无法绑定我设置的局域网本机地址：10.0.1.1，该地址是我用 systemd-networkd 配置的静态地址。根据系统启动后再次运行该服务又一切正常，初步判断是因为 dnsmasq 启动时，网络还没有配置好。

但是服务的依赖配置，感觉又没什么问题，不知道怎么解决了？难道写个 sh 脚本，特意等待若干秒，再启动 dnsmasq ？？

[Unit]

Description=A lightweight DHCP and caching DNS server

After=network.target

[Service]

Type=simple

ExecStartPre=/usr/sbin/dnsmasq --test

ExecStart=/usr/sbin/dnsmasq -k

ExecReload=/bin/kill -HUP $MAINPID

[Install]

WantedBy=multi-user.target

Jirajine

2021-03-08 20:52:32 +08:00

systemd 非常的激进，你不显示指定 After 的全都会并行启动。

https://wiki.archlinux.org/index.php/Systemd#Handling_dependencies

With systemd, dependencies can be resolved by designing the unit files correctly. The most typical case is that the unit A requires the unit B to be running before A is started. In that case add Requires=B and After=B to the [Unit] section of A. If the dependency is optional, add Wants=B and After=B instead. Note that Wants= and Requires= do not imply After=, meaning that if After= is not specified, the two units will be started in parallel.