** Changed in: neutron
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1365429
Title:
All HA routers become active on the same agent
Status in OpenStack Neutron (virtual network service):
Fix Released
Bug description:
How to reproduce:
On a setup with two L3 agents, create ten HA routers, the scheduler will
place them on both agents, but the same agent will host the active instance of
all ten routers. This defeats the idea of load sharing traffic across all L3
agents.
Solutions:
This can be solved in one of two ways:
1) Enable preemptive elections for HA routers. Keepalived enables a
configuration value that causes VRRP pre-emptive elections. This way we can set
a random VRRP priority for each router instance, and the elections process will
guarantee a random distribution of active routers on the available agents.
Preemptive elections have a major downside - If an agent that's hosting a
master instance drops, the backup router will come in to play, but when the
node is fixed the old master will re-assume its role. This second state
transition is costly and redundant.
2) With non-preemptive elections the first router instance to come up will
become the master. We can exploit this and send the notification from the
server to the agents in a random order.
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