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Re: isc-dhcp-server-ldap: fails to activate the service

[ Wolfgang Schweer, 2020-09-28 ]
> while working on Debian Edu Bullseye, I noticed that the DHCP service 
> stopped working after upgrading the system.

> Reason seems to be that the init script timed out, maybe 
> /etc/default/isc-dhcp-server could not be sourced:

This isn't the case; it seems that testing the configurations is the 
> root@tjener:~# service isc-dhcp-server status
> * isc-dhcp-server.service - LSB: DHCP server
>      Loaded: loaded (/etc/init.d/isc-dhcp-server; generated)
>      Active: activating (start) since Mon 2020-09-28 18:24:25 CEST; 2min 36s ago
>        Docs: man:systemd-sysv-generator(8)
> Cntrl PID: 1280 (isc-dhcp-server)
>       Tasks: 8 (limit: 4671)
>      Memory: 17.6M
>      CGroup: /system.slice/isc-dhcp-server.service
>              |-1280 /bin/sh /etc/init.d/isc-dhcp-server start
>              `-1310 /usr/sbin/dhcpd -t -4 -q -cf /etc/dhcp/dhcpd.conf
> Sep 28 18:24:25 tjener.intern systemd[1]: Starting LSB: DHCP server...
> Sep 28 18:24:26 tjener.intern isc-dhcp-server[1280]: Launching IPv4 server only.

I've found two ways to work around this issue:

(1) Commenting the related code in /etc/init.d/isc-dhcp-server


	#if ! /usr/sbin/dhcpd -t $VERSION -q -cf "$CONF" > /dev/null 2>&1; then
	#	echo "dhcpd self-test failed. Please fix $CONF."
	#	echo "The error was: "
	#	/usr/sbin/dhcpd -t $VERSION -cf "$CONF"
	#	exit 1

and adjusting related lines in /etc/default/isc-dhcp-server (for a 
Debian Edu combined server with two network interfaces as an example):

# On what interfaces should the DHCP server (dhcpd) serve DHCP requests?
#	Separate multiple interfaces with spaces, e.g. "eth0 eth1".
INTERFACESv4="eth0 eth1"


(2) Use a systemd unit file /etc/systemd/system/isc-dhcp-server.service

Description=DHCP server
After=network.target network-online.target

ExecStartPre=-/usr/bin/touch /var/lib/dhcp/dhcpd.leases
ExecStart=/usr/sbin/dhcpd -4 -q -cf /etc/dhcp/dhcpd.conf



Please note that I'm no expert, I guess the unit file could be improved.


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