I currently have a GKE multi-zone cluster and I will like to move it to a single-zone one, the only option I can think is to create a second cluster and do the migration manually.
Is there a more straightforward way?
Unfortunately after reading official documentation and cluster concepts I noticed that you cannot change the zones after cluster creation.
Here are the notes from the docs:
Note: After you create a cluster, you cannot change it from zonal to regional, or regional to zonal.
Note: Once you create a multi-zonal cluster, you cannot convert it to a single-zone or regional cluster.
For migration purposes there is project worth checking out called Velero. Here`s a good medium article with migration using it.