Set/Unset Maintenance Mode Using the OpenStack CLI

Problem

Toggling maintenance mode from the UI can be tedious if the operation is to be performed for multiple hosts. Since maintenance mode for a host simply involves disabling the nova-compute service, this can be achieved via the OpenStack CLI.

Environment

• Platform9 Managed OpenStack - All Versions
• OpenStack CLI

Procedure

1. Source the admin RC file for your environment.

xxxxxxxxxx

$ source [your_rc_filename]

2. Get a list of available compute services.

xxxxxxxxxx

$ openstack compute service list

3. Disable the nova-compute binary on the host you want to put in maintenance mode.

xxxxxxxxxx

$ openstack compute service set --disable --disable-reason [optional_reason] [host] nova-compute

4. Verify that the service is disabled.

xxxxxxxxxx

$ openstack compute service list | grep [host]

5. To disable maintenance mode, simply enable the nova-compute binary/service again.

xxxxxxxxxx

$ openstack compute service set --enable [host] nova-compute

6. Optional: Verify the status of the host from the UI. Login as Admin -> Infrastructure Tab

Screen_Shot_2020-01-13_at_2.44.47_PM.png

Note: If The maintenance mode column is not showing on the UI, click on the 'Gear icon' next to the search bar and select 'Maintenance Mode'.

Additional Information

• Install OpenStack CLI.
• Managing Compute Service