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.

   export HELM_LINTER_PLUGIN_NO_INSTALL_HOOK=true
   helm plugin install /usr/local/share/helm/plugins/2to3
   

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