Package: isc-dhcp-server Version: 4.4.1-2 Severity: important Hi,
I don't really have a good non-intrusive idea to fix this. I also don't see other reports about this (for code that was supposedly added before stretch), so I wonder what I'm missing. /etc/init.d/isc-dhcp-server tries to start both an IPv4 and an IPv6 server in the default configuration (both INTERFACESv[46] empty). Or if you have both set. If the IPv6 server does not start due to any reason (missing configuration, typo in the configuration, misconfigured NIC) you end up with some bad state. root@opsvm:~# systemctl start isc-dhcp-server Job for isc-dhcp-server.service failed because the control process exited with error code. See "systemctl status isc-dhcp-server.service" and "journalctl -xe" for details. Apr 01 22:37:29 opsvm isc-dhcp-server[3057]: Launching IPv4 server only. Apr 01 22:37:29 opsvm dhcpd[3066]: Internet Systems Consortium DHCP Server 4.4.1 Apr 01 22:37:29 opsvm dhcpd[3066]: Copyright 2004-2018 Internet Systems Consortium. Apr 01 22:37:29 opsvm dhcpd[3066]: All rights reserved. Apr 01 22:37:29 opsvm dhcpd[3066]: For info, please visit https://www.isc.org/software/dhcp/ Apr 01 22:37:30 opsvm dhcpd[3069]: Internet Systems Consortium DHCP Server 4.4.1 Apr 01 22:37:30 opsvm dhcpd[3069]: Copyright 2004-2018 Internet Systems Consortium. Apr 01 22:37:30 opsvm dhcpd[3069]: All rights reserved. Apr 01 22:37:30 opsvm dhcpd[3069]: For info, please visit https://www.isc.org/software/dhcp/ Apr 01 22:37:30 opsvm dhcpd[3069]: Wrote 0 group decls to leases file. Apr 01 22:37:30 opsvm dhcpd[3069]: Wrote 0 deleted host decls to leases file. Apr 01 22:37:30 opsvm dhcpd[3069]: Wrote 0 new dynamic host decls to leases file. Apr 01 22:37:30 opsvm dhcpd[3069]: Wrote 136 leases to leases file. Apr 01 22:37:30 opsvm dhcpd[3069]: Server starting service. Apr 01 22:37:32 opsvm isc-dhcp-server[3057]: Starting ISC DHCPv4 server: dhcpd. Apr 01 22:37:32 opsvm isc-dhcp-server[3057]: Launching IPv6 server only. Apr 01 22:37:32 opsvm dhcpd[3076]: Wrote 0 NA, 0 TA, 0 PD leases to lease file. Apr 01 22:37:32 opsvm dhcpd[3076]: Apr 01 22:37:32 opsvm dhcpd[3076]: No subnet6 declaration for ens18 (2001:1b10:100:3::53aa:12a). Apr 01 22:37:32 opsvm dhcpd[3076]: ** Ignoring requests on ens18. If this is not what Apr 01 22:37:32 opsvm dhcpd[3076]: you want, please write a subnet6 declaration Apr 01 22:37:32 opsvm dhcpd[3076]: in your dhcpd.conf file for the network segment Apr 01 22:37:32 opsvm dhcpd[3076]: to which interface ens18 is attached. ** Apr 01 22:37:32 opsvm dhcpd[3076]: Apr 01 22:37:32 opsvm dhcpd[3076]: Apr 01 22:37:32 opsvm dhcpd[3076]: Not configured to listen on any interfaces! Apr 01 22:37:32 opsvm dhcpd[3076]: Apr 01 22:37:32 opsvm dhcpd[3076]: If you think you have received this message due to a bug rather Apr 01 22:37:32 opsvm dhcpd[3076]: than a configuration issue please read the section on submitting Apr 01 22:37:32 opsvm dhcpd[3076]: bugs on either our web page at www.isc.org or in the README file Apr 01 22:37:32 opsvm dhcpd[3076]: before submitting a bug. These pages explain the proper Apr 01 22:37:32 opsvm dhcpd[3076]: process and the information we find helpful for debugging. Apr 01 22:37:32 opsvm dhcpd[3076]: Apr 01 22:37:32 opsvm dhcpd[3076]: exiting. Apr 01 22:37:34 opsvm isc-dhcp-server[3057]: Starting ISC DHCPv6 server: dhcpd6check syslog for diagnostics. ... failed! Apr 01 22:37:34 opsvm isc-dhcp-server[3057]: failed! root@opsvm:~# systemctl status isc-dhcp-server ● isc-dhcp-server.service - LSB: DHCP server Loaded: loaded (/etc/init.d/isc-dhcp-server; generated) Active: failed (Result: exit-code) since Mon 2019-04-01 22:37:34 UTC; 9s ago root 3069 0.0 0.2 13632 9376 ? Ss 22:37 0:00 /usr/sbin/dhcpd -4 -q -cf /etc/dhcp/dhcpd.conf ens18 moni123 mgmt100 So there is the IPv4 daemon running, but systemd thinks the whole service has failed. This leads to various weird things. You cannot stop the daemon using systemctl root@opsvm:~# systemctl stop isc-dhcp-server root@opsvm:~# systemctl status isc-dhcp-server ● isc-dhcp-server.service - LSB: DHCP server Loaded: loaded (/etc/init.d/isc-dhcp-server; generated) Active: failed (Result: exit-code) since Mon 2019-04-01 22:37:34 UTC; 2min 35s ago Docs: man:systemd-sysv-generator(8) Process: 3057 ExecStart=/etc/init.d/isc-dhcp-server start (code=exited, status=1/FAILURE) Tasks: 1 (limit: 4696) Memory: 6.5M CGroup: /system.slice/isc-dhcp-server.service └─3069 /usr/sbin/dhcpd -4 -q -cf /etc/dhcp/dhcpd.conf ens18 moni123 mgmt100 root 3069 0.0 0.2 13632 8860 ? Ss 22:37 0:00 /usr/sbin/dhcpd -4 -q -cf /etc/dhcp/dhcpd.conf ens18 moni123 mgmt100 You cannot start or restart it, because it would then just try starting the daemon again Apr 01 22:40:54 opsvm isc-dhcp-server[3599]: Starting ISC DHCPv4 server: dhcpddhcpd service already running (pid file /var/run/dhcpd.pid currenty exists) ... failed! And even after manually killing the untracked dhcpd the pidfile still exists and blocks restarting the daemon (Bug#868240). Bernhard
