I tried this.
If you stop the primary dhcp server
Start the backup (This time it works)
Restart the primary dhcp server
Secondary dhcp server fails with the error
Apr 8 06:26:00 dhcp-backupl dhcpd[1360]: failover peer failover-partner: peer moves from communications-interrupted to normal
Apr 8 06:26:00 dhcp-backupl dhcpd[1360]: failover peer failover-partner: Both servers normal
Apr 8 06:26:00 dhcp-backupl sh[1360]: ../../../../lib/isc/unix/socket.c:3361: INSIST(!sock->pending_send) failed, back trace
Apr 8 06:26:00 dhcp-backupl sh[1360]: #0 0x7fbe199fda4a in ??
Apr 8 06:26:00 dhcp-backupl sh[1360]: #1 0x7fbe199fd980 in ??
Apr 8 06:26:00 dhcp-backupl sh[1360]: #2 0x7fbe19a397e1 in ??
Apr 8 06:26:00 dhcp-backupl sh[1360]: #3 0x7fbe197e0609 in ??
Apr 8 06:26:00 dhcp-backupl sh[1360]: #4 0x7fbe1991c103 in ??
Apr 8 06:26:01 dhcp-backupl systemd[1]: isc-dhcp-server.service: Main process exited, code=killed, status=6/ABRT
Apr 8 06:26:01 dhcp-backupl systemd[1]: isc-dhcp-server.service: Failed with result 'signal'
I tried this.
If you stop the primary dhcp server
Start the backup (This time it works)
Restart the primary dhcp server
Secondary dhcp server fails with the error
Apr 8 06:26:00 dhcp-backupl dhcpd[1360]: failover peer failover-partner: peer moves from communications- interrupted to normal ./../lib/ isc/unix/ socket. c:3361: INSIST( !sock-> pending_ send) failed, back trace server. service: Main process exited, code=killed, status=6/ABRT server. service: Failed with result 'signal'
Apr 8 06:26:00 dhcp-backupl dhcpd[1360]: failover peer failover-partner: Both servers normal
Apr 8 06:26:00 dhcp-backupl sh[1360]: ../../.
Apr 8 06:26:00 dhcp-backupl sh[1360]: #0 0x7fbe199fda4a in ??
Apr 8 06:26:00 dhcp-backupl sh[1360]: #1 0x7fbe199fd980 in ??
Apr 8 06:26:00 dhcp-backupl sh[1360]: #2 0x7fbe19a397e1 in ??
Apr 8 06:26:00 dhcp-backupl sh[1360]: #3 0x7fbe197e0609 in ??
Apr 8 06:26:00 dhcp-backupl sh[1360]: #4 0x7fbe1991c103 in ??
Apr 8 06:26:01 dhcp-backupl systemd[1]: isc-dhcp-
Apr 8 06:26:01 dhcp-backupl systemd[1]: isc-dhcp-