Diff before upgrade

Show what would change in the cluster (requires helm-diff plugin)

helm diff upgrade myrelease ./chart -f values.yaml

More helm commands

Show computed values

helm get values myrelease -n mynamespace

Print the user-supplied values for a deployed release
Show all computed values (with defaults)

helm get values myrelease -a -n mynamespace

Show all values including chart defaults (-a / --all)
Rollback to specific revision

helm rollback myrelease 2 -n mynamespace

Roll back a release to revision number 2
Show release history

helm history myrelease -n mynamespace

List all revisions of a Helm release with status
Package chart for distribution

helm package ./mychart --version 1.2.3 --app-version 1.2.3

Create a versioned .tgz package from a chart directory