VIP switch causing connections that refuse to die

Michal Arbet michal.arbet at ultimum.io
Fri Feb 26 17:07:42 UTC 2021


Hi,

I found  that keepalived VIP switch cause TCP connections  that refuse to
die on host where VIP was before  it was switched.

I filled a bug here -> https://bugs.launchpad.net/kolla-ansible/+bug/1917068
Fixed here -> https://review.opendev.org/c/openstack/kolla-ansible/+/777772
Video presentation of bug here ->
https://download.kevko.ultimum.cloud/video_debug.mp4

I was just curious and wanted to ask here in openstack-discuss :

If someone already seen this issue in past ?
If yes, do you tweak net.ipv4.tcp_retries2 kernel parameter ?
If no, how did you solve this ?

Thank you,
Michal Arbet ( kevko )
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