= k8s helm v2 to v3 migration =

== 2020-04 Steps ==
 * NOTE: 202005 Migration is really easy, get some pod resarts, and helm3 linting is stricter, found some templates that needed fixing.

 * Assumes v2 was tillerless, else remove the --tiller-out-cluster
 1. set env {{{
$ export en=dev
$ export ch=main
}}}
 1. convert helm 2 to 3 {{{
$ helm 2to3 convert --tiller-out-cluster --namespace $ch-$en   $ch-$en
}}}

 1. remove --dry-run from commandline. {{{
$ time helm upgrade --namespace $ch-$en --install -f git/build.manifest/artifacts.yaml -f git/9s/9spokeshelmchart/env/9spokes/$en/values.yaml $ch-$en git/9s/9spokeshelmchart/  --atomic --debug --dry-run

Release "nsp-main" has been upgraded. Happy Helming!
}}}

 1. Later cleanup {{{
$ helm3 2to3 cleanup -tiller-out-cluster
}}}

=== Live v2 to v3 migration might need these annotation added ===
 * ONLY helm version >= 3.2  $ helm version
 * https://github.com/helm/helm/pull/7649
 * Add to v2 and then migrate {{{
KIND=deployment
NAME=my-app-staging
RELEASE=staging
NAMESPACE=default
kubectl annotate $KIND $NAME meta.helm.sh/release-name=$RELEASE
kubectl annotate $KIND $NAME meta.helm.sh/release-namespace=$NAMESPACE
kubectl label $KIND $NAME app.kubernetes.io/managed-by=Helm
}}}


== Helm migration v2 to v2 2020 ==
 * https://itnext.io/breaking-changes-in-helm-3-and-how-to-fix-them-39fea23e06ff