Incremental update

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Updated at December 15, 2023

You might need to update your service incrementally, undeploying no more than N instances at a time:

Describe the appropriate instance template.
Set the deployment policy with a non-zero value of max_unavailable: the maximum number of instances to undeploy at the same time.
Run a group's update operation.

For example, to update an instance group sequentially by undeploying one instance at a time, set the following parameters in the deploy-policy:

...
deploy-policy:
    max_unavailable: 1
    max_expansion: 0
    ...
...

The group will be updated as follows:

Rolling update