FAQ:Zero downtime images cloudposse#397

taken from https://github.com/cloudposse/docs/pull/397/files

content/faq/how-achieve-zero-downtime-image.md

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+---
+title: "How do we achieve image updates with zero downtime?"
+description: "This is similar to scaling a cluster vertically."
+tags:
+- VM
+- image
+- kops
+- updates
+---
+
+## Question
+
+How do we achieve zero-downtime deploys of VM image updates?
+
+
+## Answer
+
+This is similar to scaling a cluster vertically. This can be done with zero downtime.
+
+Basically, it requires setting the `KOPS_BASE_IMAGE` env to the new value, rebuilding the `kops` manifest, then redeploying by running the `kops rolling-update` command. See [here.](https://github.com/cloudposse/geodesic/blob/master/rootfs/templates/kops/default.yaml#L171)
+
+Our instructions are [here.](https://docs.cloudposse.com/kubernetes-optimization/scale-cluster-vertically/)
+
+We don’t presently build the `kops` images. Using Packer would be the strategy we would take.
+