I noticed that sometimes when we (Analytics) reboot our Ganeti VMs we get the following service error:
elukey@kafka-test1006:~$ sudo journalctl -u ifup@ens5.service -- Logs begin at Tue 2021-01-26 16:40:37 UTC, end at Wed 2021-01-27 07:27:28 UTC. -- Jan 26 16:40:38 kafka-test1006 systemd[1]: Started ifup for ens5. Jan 26 16:40:38 kafka-test1006 sh[487]: RTNETLINK answers: File exists Jan 26 16:40:38 kafka-test1006 sh[487]: ifup: failed to bring up ens5 Jan 26 16:40:38 kafka-test1006 systemd[1]: ifup@ens5.service: Main process exited, code=exited, status=1/FAILURE Jan 26 16:40:38 kafka-test1006 systemd[1]: ifup@ens5.service: Failed with result 'exit-code'.
The interface is up and running fine:
elukey@kafka-test1006:~$ ip link show ens5 2: ens5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000 link/ether aa:00:00:d2:81:d8 brd ff:ff:ff:ff:ff:ff elukey@kafka-test1006:~$ ip addr [..] 2: ens5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether aa:00:00:d2:81:d8 brd ff:ff:ff:ff:ff:ff inet 10.64.16.146/22 brd 10.64.19.255 scope global ens5 valid_lft forever preferred_lft forever inet6 2620:0:861:102:10:64:16:146/64 scope global dynamic mngtmpaddr valid_lft 2591992sec preferred_lft 604792sec inet6 fe80::a800:ff:fed2:81d8/64 scope link valid_lft forever preferred_lft forever
Restarting the service doesn't work (same error), the only thing that I found working (to clear the error) is ip addr flush followed by either a restart of the service or ifup ens5. Any idea why this happening?
I left kafka-test1006 unfixed to let people check :)