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If you mean this:

####################
# keepalived options
####################
# Arbitrary unique number from 0..255
#keepalived_virtual_router_id: "51"

It’s an arbitrary number. Normally you don’t have to change the default, but in case you have several keepalived’s on the same network, you need to ensure they have different numbers to prevent trouble.

If you mean this:

####################
# keepalived options
####################
# Arbitrary unique number from 0..255
#keepalived_virtual_router_id: "51"

It’s an arbitrary number. Normally you don’t have to change the default, but in case you have several keepalived’s on the same network, you need to ensure they have different numbers to prevent trouble.

EDIT:

Kolla seems to use haproxy and keepalived to set up multiple controllers, as hinted in https://docs.openstack.org/kolla-ansible/latest/admin/production-architecture-guide.html.

If you have multiple virtual router instances with the same ID on your network, you should see VRRP advertisements with the same ID, for example like this Serverfault question. I had such a situation once (deploying two Helion OpenStack clouds on the same network), but don’t remember what error messages if any were in the keepalived logs.