For scale sets with configured application health probes or Application Health extension, the upgrade waits up to 5 minutes for the instance to become healthy, before moving on to upgrade the next batch. All specified extensions and configurations in the scale set model are applied to the upgraded instance.Ĥ. The OS disk of every VM in the selected upgrade batch is replaced with a new OS disk created from the latest image.

There is no minimum scale set size requirement and scale sets with 5 or fewer instances will have 1 VM per upgrade batch (minimum batch size).ģ.

The upgrade orchestrator identifies the batch of VM instances to upgrade, with any one batch having a maximum of 20% of the total instance count, subject to a minimum batch size of one virtual machine. The image upgrade is then applied to an individual scale set in a batched manner as follows:īefore beginning the upgrade process, the orchestrator will ensure that no more than 20% of instances in the entire scale set are unhealthy (for any reason).Ģ. The region of a scale set becomes eligible to get image upgrades either through the availability-first process for platform images or replicating new custom image versions for Share Image Gallery.

( Supported OS Images List, includes Ubuntu 16.04-LTS) Ubuntu 16.04 upgrade to 18.04 instructions (using Data Science VM instructions)Īzure virtual machine scale set automatic OS image upgrades Workaround Instructions (for anyone who may run into this with Windows VMs): (For more information, see KB 4014997.) Instead, you should create a new Azure virtual machine that is running the supported version of the operating system that is required and then migrate the workload. Microsoft does not support an upgrade of the operating system of a Microsoft Azure Virtual Machine. Hello, of a few Windows 10 scenarios and Azure virtual machine scale set automatic OS image upgrades (which does work with Ubuntu 16.04-LTS, see below), Azure does not currently support an upgrade of the operating system of a Microsoft Azure Virtual Machine:

Ubuntu virtualbox image 16.04