K8s version hardcoded? (... or I am wrong)

[ivanilves]

Hi guys!

One question:

When I use latest (v0.9.9) version of kube-aws I always get K8s cluster of version 1.8.4.

I also see this line of code in kube-aws:
https://github.com/kubernetes-incubator/kube-aws/blob/bc100a61283601fa7a82a544f6d8c8f9acf002fc/core/controlplane/config/config.go#L32

Does this mean that with a particular version of kube-aws I could only use one specific version of Kubernetes?

Does this also mean that to upgrade Kubernetes version on cluster I always need to get new kube-aws ?
... or once deployed with kube-aws cluster should be upgraded to new versions of K8s some other way ?

Thank you!

[camilb]

Hi @ivanilves this is the default version, in case you don not override it in cluster.yaml.

To upgrade the kubernetes version in a cluster, you have to change the version in cluster.yaml, then render and update the stack using kube-aws render stack and kube-aws update --s3-uri s3://bucket_name

If you intent to use previous versions of kubernetes it's better to also use previous versions of kube-aws. Sometimes it may work, but it's possible to have changes that are not backward compatible. kube-aws v0.9.9 works fine with kubernetes v1.8.0 and up.

Update:

It is also possible to override the container image, for example if you preffer to use Google's hyperkube build.

# Version of hyperkube image to use. This is the tag for the hyperkube image repository.
kubernetesVersion: v1.8.5

# Hyperkube image repository to use.
hyperkubeImage:
  repo: gcr.io/google-containers/hyperkube-amd64
  rktPullDocker: true

[ivanilves]

Thanks @camilb ! The thing is that I am trying to install Kubernetes 1.8.5 by changing the version accordingly in the cluster.yaml and still gettings cluster with 1.8.4... Maybe some my fault, I need to recheck. 🤔

[ivanilves]

@camilb you were right!

It works! The error was my own misconfiguration (I was loading wrong cluster.yaml) Thanks again! Closing the issue!

🎉

[sonnysideup]

I'm curious, what limitations exist (if any) regarding an upgrade to a more recent version of K8s using kube-aws? Stated differently, can I use to v0.9.9 to upgrade to the latest version of K8s v1.8 (latest tag is v1.8.7_coreos.0)? How about K8s v1.9?

[camilb]

@drywheat support for Kubernetes 1.9 was added in #1074 here: https://github.com/kubernetes-incubator/kube-aws/pull/1074/files#diff-ef25536c536667a40b993d4d24ab7567R1915, which is not included in v0.9.9. It's a small change, as mentioned in #1076

[whereisaaron]

@drywheat I've been using 1.8.7 a lot with kube-aws 0.9.9 without problem. Generally Is expect 1.8.x to work with 0.9.9, since they won't make major API version or component changes.