I had occasion to shrink my Contrail compute side today, and it occurred to me that while I could just pull the plug, this would result in a persistent alarm in the dashboard, mourning the loss of the old node. Since this is not an uncommon occurrence, I found a procedure to do this:
- On the confuration node (cfg-mgt) remove the vRouter
fab detach_vrouter - Stop openstack-nova-compute service in the node to be removed
[root@hostname ~]# openstack-status
openstack-nova-compute: active
[root@hostname ~]# service openstack-nova-compute stop
Stopping openstack-nova-compute: [ OK ] - Remove to-be-removed compute-node from openstack node’s compute-list
nova-manage service disable --host=<host ID> --service=nova-compute - Run
provision_vrouter.pycommand to delete this node
source /opt/contrail/api-venv/bin/activate && python
/opt/contrail/utils/provision_vrouter.py --host_name <host ID> --host_ip a.b.c.d --api_server_ip a.b.c.x --oper del --admin_user <ADMIN USER> --admin_password <ADMIN PASSWORD> --admin_tenant_name admin
