The Azure Team recently announced the availability of the new Planned Maintenance experience. The goal is to provide customers a new experience that enables them to initiate a proactive redeploy of their VMs for planned maintenance events that require a reboot. Maintenance will be communicated via the Azure portal, Azure Service Health dashboard, CLI and PowerShell. Subscription owners and admins will also continue to get maintenance notifications via e-mail.
Customers can now test the Planned Maintenance experience in the US West Central region. To do so, you need to use a special link for accessing the Azure Portal. In the overview screen for a VM which will be impacted by scheduled maintenance, you’ll see a screen similar to the one below.
Choosing to initiate maintenance now will redeploy the VM onto a node which has already been upgraded, allowing you to control when the VM is restarted. In addition, the VM blade in the preview portal will contain new columns which can be used to determine the maintenance status of the VM:
Maintenance windows which involve VM reboots follow the same update patterns Azure would use in any other situation. This means that VMs that are part of Availability Sets or VM Scale Sets will be part of separate update domains and Azure will never update hosts in more than one update domain at a time. Each Azure region also has a region pair (like US East and US West) and updates are never performed across region pairs at the same time. However, for VMs which are not in an availability set, this new feature gives you the ability to control when the updates are done and schedule those within maintenance windows. Also, if you need an exact window during which maintenance is performed even for VMs in an availability set, this is the way to accomplish that. Lastly, if you need to coordinate the impact of VM redeployment or applications don’t support HA, the planned maintenance support experience would help you deal with those situations as well.
Full control of this is also available via PowerShell as you would expect. You can query the planned maintenance status of a VM using Get-AzureRmVM: Get-AzureRmVM -ResourceGroupName “PrevMaintenance” -Name “mytestvm2” -Status. You can also perform (kick off) the maintenance task using Restart-AzureRmVM and the “PerformMaintenance” parameter: Restart-AzureRmVM -PerformMaintenance -name “mytestvm2” -ResourceGroupName “PrevMaintenance”. PowerShell makes it easy to get the status of all of the VMs across a subscription very easily. Here’s a sample of how you would get a list of all VMs and their planned maintenance status in the current subscription:
Some other useful resources: