I had two problems :
1) no PID-file created and
2) I couldn't assign a NIC to "isc-dhcp-server"aka "dhcpd".
It turned out that the PID-file has to be "/var/run/dhcp-
server/dhcpd.pid". If not, apparmor wouldn't allow the creation of the
PID-file.
And the the file defining the originally installed dhcpd-service script
("/usr/lib/systemd/system/isc-dhcp-server.service") is having other erroneous
fixed paths.
Solution
---------
So I copied "/usr/lib/systemd/system/isc-dhcp-server.service" to
"/etc/systemd/system/" and modified it into the one shown below. This solved my
problems.
[Unit]
Description=ISC DHCP IPv4 server
Documentation=man:dhcpd(8)
Wants=network-online.target
After=network-online.target
After=time-sync.target
ConditionPathExists=/etc/default/isc-dhcp-server
ConditionPathExists=|/etc/ltsp/dhcpd.conf
ConditionPathExists=|/etc/dhcp/dhcpd.conf
[Service]
EnvironmentFile=/etc/default/isc-dhcp-server
RuntimeDirectory=dhcp-server
# The leases files need to be root:dhcpd even when dropping privileges
ExecStart=/bin/sh -ec '\
CONFIG_FILE=/etc/dhcp/dhcpd.conf; \
if [ -f /etc/ltsp/dhcpd.conf ]; then CONFIG_FILE=/etc/ltsp/dhcpd.conf; fi; \
if [ ! -d /var/run/dhcp-server ]; then mkdir -p /var/run/dhcp-server ;
chown dhcpd:dhcpd /var/run/dhcp-server ; chmod u=rwx,go=rx /var/run/dhcp-server
; fi; \
if [ ! "$DHCPDv4_PID" ] ; then DHCPDv4_PID=/var/run/dhcp-server/dhcpd.pid;
fi; \
[ -e /var/lib/dhcp/dhcpd.leases ] || touch /var/lib/dhcp/dhcpd.leases; \
chown root:dhcpd /var/lib/dhcp /var/lib/dhcp/dhcpd.leases; \
chmod 775 /var/lib/dhcp ; chmod 664 /var/lib/dhcp/dhcpd.leases; \
exec dhcpd -user dhcpd -group dhcpd -f -4 -pf $DHCPDv4_PID -cf $CONFIG_FILE
$INTERFACESv4'
[Install]
WantedBy=multi-user.target
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https://bugs.launchpad.net/bugs/1448657
Title:
isc-dhcp-server: Can't create PID file /run/dhcp-server/dhcpd.pid:
Permission denied
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