This section instructs you on how to reboot an OpenStack compute node for a planned maintenance.
To reboot an OpenStack compute node:
Log in to an OpenStack controller node.
Disable scheduling of new VMs to the node. Optionally provide a reason comment:
openstack compute service set --disable --disable-reason \
maintenance <compute_node_hostname> nova-compute
Migrate workloads from the OpenStack compute node:
nova host-evacuate-live <compute_node_hostname>
Log in to an OpenStack compute node.
Stop the nova-compute service:
service nova-compute stop
Shut down the OpenStack compute node, perform the maintenance, and turn the node back on.
Verify that the nova-compute service is up and running:
service nova-compute status
Perform the following steps from the OpenStack controller node:
Enable scheduling of VMs to the node:
openstack compute service set --enable <compute_node_hostname> nova-compute
Verify that the nova-compute service and neutron agents are
running on the node:
openstack network agent list --host <compute_node_hostname>
openstack compute service list --host <compute_node_hostname>
The OpeStack compute service state must be up. The Neutron agent
service state must be UP and the alive column must include
:-).
Examples of a positive system response:
+----+--------------+------+------+---------+-------+----------------------------+
| ID | Binary | Host | Zone | Status | State | Updated At |
+----+--------------+------+------+---------+-------+----------------------------+
| 70 | nova-compute | cmp1 | nova | enabled | up | 2020-09-17T08:51:07.000000 |
+----+--------------+------+------+---------+-------+----------------------------+
+----------+--------------------+------+-------------------+-------+-------+---------------------------+
| ID | Agent Type | Host | Availability Zone | Alive | State | Binary |
+----------+--------------------+------+-------------------+-------+-------+---------------------------+
| e4256d73 | Open vSwitch agent | cmp1 | None | :-) | UP | neutron-openvswitch-agent |
+----------+--------------------+------+-------------------+-------+-------+---------------------------+
Optional. Migrate the instances back to their original OpenStack compute node.