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Hands-on Lab·Certified Kubernetes Application Developer

Helm Install, Upgrade and Rollback

Helm is a package manager with a memory: every install and upgrade is a revision it can go back to. The five commands that cover almost everything are template, install, upgrade, history and rollback, and all five are here against a chart created locally so nothing depends on a reachable repository.

Application Deployment Guide 21 of 44 Intermediate

Written against the versions above. Helm 3 has no Tiller and stores each release revision as a Secret of type `helm.sh/release.v1` in the release's own namespace. That is why `helm list` is namespaced, why deleting a namespace destroys the release history with it, and why anyone with Secret read access in that namespace can read the release.

Helm runs client-side and talks to the API server; the release Secrets live in the cluster.
Server NameIP AddressOSRolesCPURAMHDD
CKA1001192.168.0.175Ubuntu 26.04 LTSControl Plane Node2 Core4 GB50 GB
CKA1001-NODE01192.168.0.176Ubuntu 26.04 LTSWorker Node2 Core4 GB50 GB
CKA1001-NODE02192.168.0.177Ubuntu 26.04 LTSWorker Node2 Core4 GB50 GB
CKA1001-NODE03192.168.0.178Ubuntu 26.04 LTSWorker Node2 Core4 GB50 GB

Before you start

  1. A chart you can read

  2. Render it without a cluster

  3. Install, and look at the release

  4. Upgrade, then take it back

  5. Where the state actually lives

Official sources

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