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Azure Arc Update Management uses the Azure Automation Update Management solution to update virtual machines hosted on an on-premises Hyper-V host. The Update Management solution uses a combination of push and pull mechanisms to deliver updates to virtual machines.
When updating an on-premises host machine, Arc Update Management will first create checkpoints on all VMs that are running on the host machine. This will ensure that any changes made to the VMs during the update process can be rolled back if necessary. Arc Update Management will then shut down the host machine and install the updates. Once the updates have been installed, Arc Update Management will restart the host machine.
On-premise VMs do not have to be onboarded separately to the host machine. Arc Update Management will automatically discover all VMs that are running on the host machine and add them to the update management process. Arc Update Management will create a checkpoint for each VM before updating and re-booting the VM.
Here are the steps involved in updating virtual machines hosted on an on-premises Hyper-V host with Azure Arc Update Management:
- In the Azure portal, go to the Azure Arc resource bridge resource.
- In the left navigation pane, select Updates.
- On the Updates page, select the check box next to the virtual machine that you want to update.
- In the Actions menu, select Update.
- In the Update blade, select the check box next to the updates that you want to install.
- Select Save.
- Arc Update Management will create a checkpoint for the virtual machine and then install the updates.
- Once the updates have been installed, Arc Update Management will restart the virtual machine.
Here are some additional considerations for updating virtual machines hosted on an on-premises Hyper-V host with Azure Arc Update Management:
- Make sure that the virtual machines have the latest version of the Hyper-V integration services installed.
- Make sure that the virtual machines have enough resources to handle the update process.
- If you are using a cluster, make sure that the cluster is healthy and that all of the nodes are available.
- If you are using a storage area network (SAN), make sure that the SAN is healthy and that there is enough bandwidth to support the update process.
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