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Upgrade your cluster
Constellation provides an easy way to upgrade to the next release. 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 a list of available updates.
constellation upgrade plan
The command lets you interactively choose from a list of available updates and prepares your Constellation config file for the next step.
To use the command in scripts, use the --file flag to compile the available options into a YAML file.
You can then set the chosen upgrade option in your Constellation config file.
:::caution
constellation upgrade plan only works for official Edgeless release images.
If your cluster is using a custom 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.