Public bug reported:
If KillMode in systemd config of a neutron l3 agent service is set to
'process' - it will not kill child processes on main service stop - this
is useful when we don't want data-plane downtime on agent stop/restart
due to keepalived exit.
However in some cases graceful cleanup on l3 agent shutdown is needed -
like with containerised control plane, when kubernetes kills l3-agent
pod, it automatically kills its children (keepalived processes) in non-
graceful way, so that keepalived does not clear VIPs. This leads to a
situation when same VIP is present on different nodes and hence to long
downtime.
The proposal is to add a new l3 agent config so that it handles stop
(SIGTERM) by deleting all routers. For HA routers it results in graceful
keepalived shutdown.
** Affects: neutron
Importance: Medium
Assignee: Oleg Bondarev (obondarev)
Status: New
** Tags: l3-ha l3-ipam-dhcp
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https://bugs.launchpad.net/bugs/1851609
Title:
Add an option for graceful l3 agent shutdown
Status in neutron:
New
Bug description:
If KillMode in systemd config of a neutron l3 agent service is set to
'process' - it will not kill child processes on main service stop -
this is useful when we don't want data-plane downtime on agent
stop/restart due to keepalived exit.
However in some cases graceful cleanup on l3 agent shutdown is needed
- like with containerised control plane, when kubernetes kills
l3-agent pod, it automatically kills its children (keepalived
processes) in non-graceful way, so that keepalived does not clear
VIPs. This leads to a situation when same VIP is present on different
nodes and hence to long downtime.
The proposal is to add a new l3 agent config so that it handles stop
(SIGTERM) by deleting all routers. For HA routers it results in
graceful keepalived shutdown.
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https://bugs.launchpad.net/neutron/+bug/1851609/+subscriptions
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