This is created as split from other Jira ticket[1] which was made global as impacting various services and resolution was specific to use of dumb-init which is not the case with neutron pods.

When deleting neutron-api it will stay in TERMINATING state for the duration set on terminationGracePeriodSeconds (30 seconds), modifying this value won't change anything, it will take all the time given by terminationGracePeriodSeconds(or -grace-period), like:

$ time oc delete pod neutron-5fc78456cf-2dl2m --grace-period=100
pod "neutron-5fc78456cf-2dl2m" deleted

real    1m41.416s
user    0m0.225s
sys     0m0.055s

The pod is running two containers, one neutron-httpd and other neutron-api, neutron-api is not getting stopped for some reason.

SIGTERM signal is received by the neutron-api process and forwarded to the child processes(api/rpc/maintenance/etc). api processes are not getting stopped and thus pod not killed until grace-period is hit [1],),] a possible related old issue https://bugs.launchpad.net/neutron/+bug/1815871

Issue can be seen during scale down, config rollovers, etc,but as the default timeout is 30 second it may get unnoticed.

 [1] https://issues.redhat.com/browse/OSPRH-770