Migrate Releases from Helm v2 to Helm v3

About this task

After upgrading a cluster, end users’ Helm releases are not upgraded from version 2. Run a custom script to migrate the end users’ Helm releases or installs to Helm v3.

Procedure

1. Install the /helm-2to3 plugin.

   ~(keystone-admin)]$ mkdir plugin
   wget https://github.com/helm/helm-2to3/releases/download/v0.9.0/helm-2to3_0.9.0_linux_amd64.tar.gz
   pushd plugin/
   tar -xvzf ../helm-2to3_0.9.0_linux_amd64.tar.gz
   mkdir bin
   cp 2to3 bin
   popd
   export HELM_LINTER_PLUGIN_NO_INSTALL_HOOK=true
   helm plugin install ./plugin
   

2. Move the helm2 config to helm3.

   ~(keystone-admin)]$ helm 2to3 move config
   

3. Choose a Helm v2 release to migrate.

   ~(keystone-admin)]$ helmv2-cli -- helm list -a
   

4. Migrate a helm2 release, for example, myApplication.

   ~(keystone-admin)]$ ./migrate_helm_release.py myApplication
   

5. Check if it migrated successfully.

   ~(keystone-admin)]$ helm list -A -a
   

6. The migrated release should not appear in helm2.

   ~(keystone-admin)]$ helmv2-cli -- helm list -a