Hi,
I have a setup with 2 redundant (primary / secondary) DHCPd servers
where both of them crash occasionally. This is a separate bug, but this
solution was useful in restarting the daemons after crashing and leaving
the pid files behind.
To automatically restart the daemons after this modification is
introduced, edit the systemd service description with
systemctl edit isc-dhcp-server.service
and add something like
[Service]
Type=forking
PIDFile=dhcpd.pid
Restart=on-failure
StartLimitIntervalSec=60s
StartLimitBurst=8
RestartSec=5s
in the appropriate section. Then enable this configuration, and systemd
will be able to restart DHCPd after they crash.
