Ubuntu 18.04 here, no apparmor.
Directory /run is on tempfs, so it is empty at start.
I suppose PID file /run/dhcp-server/dhcpd.pid can't be created because
directory /run/dhcp-server is missing at startup and I haven't found where it
will be created.
I've fixed systemd unit "/lib/systemd/system/isc-dhcp-server.service" by
creating the needed "/run/dhcp-server" folder before starting dhcpd:
-----------------
[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
ExecStartPre=/bin/mkdir -p /run/dhcp-server
ExecStart=/bin/sh -ec '\
CONFIG_FILE=/etc/dhcp/dhcpd.conf; \
if [ -f /etc/ltsp/dhcpd.conf ]; then CONFIG_FILE=/etc/ltsp/dhcpd.conf; 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; \
if [ ! -d /run/dhcp-server ]; then mkdir -p /run/dhcp-server ; chown dhcpd
/run/dhcp-server ; chmod 775 /run/dhcp-server; fi; \
exec dhcpd -user dhcpd -group dhcpd -f -4 -pf /run/dhcp-server/dhcpd.pid
-cf $CONFIG_FILE $INTERFACES'
[Install]
WantedBy=multi-user.target
-----------------
Still need to fix hardcoded PID filename instead of /etc/default/isc-
dhcp-server value...
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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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