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constellation/docs/versioned_docs/version-1.5/workflows/upgrade.md
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Upgrade you cluster

Constellation provides an easy way to upgrade from one release to the next. This involves choosing a new VM image to use for all nodes in the cluster and updating the cluster's expected measurements.

Plan the upgrade

If you don't already know the image you want to upgrade to, use the upgrade plan command to pull in a list of available updates.

constellation upgrade plan

The command will let you interactively choose from a list of available updates and prepare your Constellation config file for the next step.

If you plan to use the command in scripts, use the --file flag to compile the available options into a YAML file. You can then manually set the chosen upgrade option in your Constellation config file.

:::caution

The constellation upgrade plan will only work for official Edgeless release images. If your cluster is using a custom image or a debug image, the Constellation CLI will fail to find compatible images. However, you may still use the upgrade execute command by manually selecting a compatible image and setting it in your config file.

:::

Execute the upgrade

Once your config file has been prepared with the new image and measurements, use the upgrade execute command to initiate the upgrade.

constellation upgrade execute

After the command has finished, the cluster will automatically replace old nodes using a rolling update strategy to ensure no downtime of the control or data plane.