Hi,
we use z/VM's Live Guest Relocation for our Debian/GNU Linux
servers. Since following commit this is broken:
d4560150cb47daba50b0d080550ca4bbe80cf3c3 is the first bad commit
commit d4560150cb47daba50b0d080550ca4bbe80cf3c3
Author: Julian Wiedmann <jwi@xxxxxxxxxxxxx>
Date: Thu Feb 28 18:59:39 2019 +0100
s390/qeth: call dev_close() during recovery
With Debian/buster and Linux 4.18.x this works fine.
With Debian/bullseye and Linux 5.10.x this does not work anymore.
The reason for that is that all configured routes are lost after
relocating the guest.
This looks to me like a major regression.
The network is configured via /etc/network/interfaces and executing
systemctl restart networking fixes the issue. This can be done via a
udev rule, but this looks like a rather incomplete workaround to us.
All manually added routing information will be lost anyway.
And I might not imagine what happens to any firewall connection
tables or ipvs connection tracking information in case of a Live
Guest Relocation.
So is there any kernel level solution for this you can think of?
Thanks for any advice and comments,
best regards
Waldemar
