On Fri, 4 Jun 2021 14:08:51 +0200 Wolfgang Schweer <w.schw...@gmx.de> wrote:
[ 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
cause.
> 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
test_config()
{
VERSION="$1"
CONF="$2"
#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
#fi
}
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"
#INTERFACESv6=""
----------------------
(2) Use a systemd unit file /etc/systemd/system/isc-dhcp-server.service
[Unit]
Description=DHCP server
After=network.target network-online.target
Requires=slapd.service
Tried your work around (1) and failed, activating both, INTERFACESv4=""
and INTERFACESv6="" for eth0. Worked, when only activating
INTERFACESv4="" for eth0. Wondered if changes in
/etc/init.d/isc-dhcp-server are necessary: For me, they're not! Only
activating INTERFACESv4="" for eth0 in /etc/default/isc-dhcp-server does
the trick. BUT: I changed to systemv-init during installation of debianedu!
