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[Bug 1830232] [NEW] [Functional tests] Keepalived fails to start when not existing interfaces are set in config file

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Public bug reported:

It looks that when not existing interfaces are given in keepalived.conf
file, keepalived may not start properly.

I saw that when running functional tests from module neutron.tests.functional.agent.linux.test_keepalived.KeepalivedManagerTestCase on RHEL 8 where keepalived 2.0.10 is used.
I saw in logs something like:

maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: Registering Kernel netlink reflector
maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: Registering Kernel netlink command channel
maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: Opening file '/tmp/tmpo_he5agd/tmpnhyku1i8/router1/keepalived.conf'.
maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 7) WARNING - interface eth0 for vrrp_instance VR_1 doesn't exist
maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 17) (VR_1) tracked interface eth0 doesn't exist
maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 20) WARNING - interface eth0 for ip address 169.254.0.1/24 doesn't exist
maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 23) WARNING - interface eth1 for ip address 192.168.1.0/24 doesn't exist
maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 24) WARNING - interface eth2 for ip address 192.168.2.0/24 doesn't exist
maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 25) WARNING - interface eth2 for ip address 192.168.3.0/24 doesn't exist
maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 26) WARNING - interface eth10 for ip address 192.168.55.0/24 doesn't exist
maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 29) WARNING - interface eth1 for VROUTE nexthop doesn't exist
maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 34) WARNING - interface eth4 for vrrp_instance VR_2 doesn't exist
maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 40) (VR_2) tracked interface eth4 doesn't exist
maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 43) WARNING - interface eth4 for ip address 169.254.0.2/24 doesn't exist
maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 46) WARNING - interface eth2 for ip address 192.168.2.0/24 doesn't exist
maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 47) WARNING - interface eth6 for ip address 192.168.3.0/24 doesn't exist
maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 48) WARNING - interface eth10 for ip address 192.168.55.0/24 doesn't exist
maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: Non-existent interface specified in configuration
maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: Stopped - used 0.000608 user time, 0.000000 system time
maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived[11266]: Keepalived_vrrp exited with permanent error CONFIG. Terminating
maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived[11266]: Stopped Keepalived v2.0.10 (11/12,2018)

** Affects: neutron
     Importance: Medium
     Assignee: Slawek Kaplonski (slaweq)
         Status: Confirmed


** Tags: functional-tests

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https://bugs.launchpad.net/bugs/1830232

Title:
  [Functional tests] Keepalived fails to start when not existing
  interfaces are set in config file

Status in neutron:
  Confirmed

Bug description:
  It looks that when not existing interfaces are given in
  keepalived.conf file, keepalived may not start properly.

  I saw that when running functional tests from module neutron.tests.functional.agent.linux.test_keepalived.KeepalivedManagerTestCase on RHEL 8 where keepalived 2.0.10 is used.
  I saw in logs something like:

  maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: Registering Kernel netlink reflector
  maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: Registering Kernel netlink command channel
  maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: Opening file '/tmp/tmpo_he5agd/tmpnhyku1i8/router1/keepalived.conf'.
  maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 7) WARNING - interface eth0 for vrrp_instance VR_1 doesn't exist
  maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 17) (VR_1) tracked interface eth0 doesn't exist
  maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 20) WARNING - interface eth0 for ip address 169.254.0.1/24 doesn't exist
  maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 23) WARNING - interface eth1 for ip address 192.168.1.0/24 doesn't exist
  maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 24) WARNING - interface eth2 for ip address 192.168.2.0/24 doesn't exist
  maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 25) WARNING - interface eth2 for ip address 192.168.3.0/24 doesn't exist
  maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 26) WARNING - interface eth10 for ip address 192.168.55.0/24 doesn't exist
  maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 29) WARNING - interface eth1 for VROUTE nexthop doesn't exist
  maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 34) WARNING - interface eth4 for vrrp_instance VR_2 doesn't exist
  maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 40) (VR_2) tracked interface eth4 doesn't exist
  maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 43) WARNING - interface eth4 for ip address 169.254.0.2/24 doesn't exist
  maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 46) WARNING - interface eth2 for ip address 192.168.2.0/24 doesn't exist
  maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 47) WARNING - interface eth6 for ip address 192.168.3.0/24 doesn't exist
  maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: (Line 48) WARNING - interface eth10 for ip address 192.168.55.0/24 doesn't exist
  maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: Non-existent interface specified in configuration
  maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived_vrrp[11267]: Stopped - used 0.000608 user time, 0.000000 system time
  maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived[11266]: Keepalived_vrrp exited with permanent error CONFIG. Terminating
  maj 23 10:10:16 de208a364e0f82ba5124812fa88cfd47-tester-0 Keepalived[11266]: Stopped Keepalived v2.0.10 (11/12,2018)

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