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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
Source the admin RC file for your environment.
$ source [your_rc_filename]
Get a list of available compute services.
$ openstack compute service list
Disable the nova-compute binary on the host you want to put in maintenance mode.
$ openstack compute service set --disable --disable-reason [optional_reason] [host] nova-compute
Verify that the service is disabled.
$ openstack compute service list | grep [host]
To disable maintenance mode, simply enable the nova-compute binary/service again.
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'.
