If you have used the VMware.hv.helper the title of this blog post might sound strange since the set-hvmachine already has a way to set maintenance mode. When Ryan Butler asked me the question this week though I didn’t think of that and dived into the api’s immediately. The machines.Machine_EnterMaintenanceMode method looked good to me and than I though of the vmware.hv.helper and noticed that with

Set-HVMachine -Maintenance ENTER_MAINTENANCE_MODE

it was also possible so set maintenance mode. The usage though made me think immediately that this was not actually using a proper api call but the update function. A quick look at the function itself confirmed this. It sets that status of the virtual machine by directly setting the status.

if ($Maintenance) { if ($Maintenance -eq 'ENTER_MAINTENANCE_MODE') { $updates += Get-MapEntry -key 'managedMachineData.inMaintenanceMode' -value $true } else { $updates += Get-MapEntry -key 'managedMachineData.inMaintenanceMode' -value $false } }

(this is just a snippet of the complete function)

If you are below version 7.5 of Horizon view it’s probably of no use to continue with the rest of this blog post. The api explorer only mentions the relevant functions since 7.5! They have been tried against 7.0.3 and 6.2 and there they don’t work.

So back to the drawing board it was and I needed to look at the API explorer, there are 4 relevant methods for maintenance mode.

As usual there are methods for multiple machines that use an array of id’s (with machines in the name) and methods for single machines id’s (without the machines in the name).

Since I usually use instant clones these days I created a small pool with three linked clones. With get-hvmachine I can show you their names and state.

(get-hvmachine -pool pod2_linked).base | select-object name,basicstate

Since I know that get-hvmachine will already give you the id of a machine it’s easy to do a one liner to set one system in maintenance mode.

$services1.Machine.Machine_EnterMaintenanceMode((get-hvmachine -machinename p2lc001).id)

and exit maintenance mode.

$services1.Machine.Machine_ExitMaintenanceMode((get-hvmachine -machinename p2lc001).id)

And the entire pool?

$services1.Machine.Machine_EnterMaintenanceModemachines((get-hvmachine -pool pod2_linked).id)

And exit maintenance mode for the entire pool.

$services1.Machine.Machine_ExitMaintenanceModemachines((get-hvmachine -pool pod2_linked).id)

Okay so we now know how this works but I don’t want to use to vmware.hv.helper module for this at all because I want to be able to use a list of machines or based on part of the name. That can be done using a query. The query entitytype to use is MachineSummaryView and if you use queryfiltercontains it’s also possible to use only a part of the name for a kind of wildcard selection. Combine several of these in with queryfilteror and it gives the opportunity to select them from a list.

p2lc001 p2lc003

Now I replaced the names in the txt file with only p2lc00

And back into maintenance mode

So this is a nice way to manage the machines and their maintenance state. Please remember that these scripts only work against horizon 7.5 and higher.