This Microsoft Azure Virtual Desktop blog post will show you how to host in drain mode.
Drain Mode
The Drain Mode feature in Azure Virtual Desktop allows us to place a hold on new sessions and only allow existing sessions to run on the host.
It is recommended to put a host in maintenance mode before doing planned maintenance (restart) and redirecting a new session to a different host.
Install AVD PowerShell Module
Before we start, we need to install the AVD PowerShell module using the following cmdlet.
Install-Module -Name Az.DesktopVirtualization
Once the module is installed, run the cmdlet below to connect to Azure.
Connect-AzAccount
Enter Drain Mode
Run the cmdlet below to place a host in Dran Mode mode.
Update-AzWvdSessionHost -ResourceGroupName RGNAME -HostPoolName HOSTPULNAME -Name SERVER -AllowNewSession:$false
Update the cmdlet with:
- Resource Group Name
- Host Pool Name
- Server Name
To exit Drain Mode change the -AllowNewSession:$false to -AllowNewSession:$true
Multiple Servers
To place multiple AVD hosts in Drain Mode using the code below.
$servers = "server1", "servr2", "server3"
foreach( $server in $servers )
{
Update-AzWvdSessionHost -ResourceGroupName RGNAME -HostPoolName HOSTPOOL -Name $server -AllowNewSession:$false
}
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