April 2018
Intermediate to advanced
468 pages
14h 34m
English
Content preview from Mastering Kubernetes - Second Edition
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Upgrading and rolling back a release
You may want to upgrade a package you installed to the latest and greatest version. Helm provides the upgrade command, which operates intelligently and only updates things that have changed. For example, let's check the current values of our mariadb installation:
> helm get values cranky-whippet mariadbDatabase: awesome_stuff mariadbRootPassword: evenbettersecret
Now, let's run, upgrade, and change the name of the database:
> helm upgrade cranky-whippet --set mariadbDatabase=awesome_sauce stable/mariadb $ helm get values cranky-whippet mariadbDatabase: awesome_sauce
Note that we've lost our root password. All the existing values are replaced when you upgrade. OK, let's roll back. The helm history command ...
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