Introduction to HelmPune Kubernetes Meetup #4

22nd April 2017

About Me

What is Helm?

Helm is a package manager for Kubernetes.

It allows easy installation and management of Kubernetes applications.

Helm Architecture

Helm Client

Pod

Tiller

.tgz

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Talks to Executes

Introduction via Loose Equivalences

Equivalences drawn here are mainly to help in getting started

There are major differences as we dig deeper

Helm ≈ Docker client

● Runs on client machine

● Talks to Kubernetes cluster configured in ${HOME}/.kube/config

● Single binary download available for Linux and OSX

Tiller ≈ Docker Daemon

● Server-side component

● Runs as a pod on Kubernetes cluster

● Does the actual work of installing and managing Kubernetes applications

as well as maintaining release history

Charts ≈ Puppet Modules

● Charts are Helm packages stored as text files. A chart contains minimum

of 2 things :

○ A Chart.yaml that describes the package

○ One or more template files which define Kubernetes manifests

● Charts can be referred to from URL’s, tgz archives and directories

● Charts and their values can be customized as needed

● Charts can depend on other charts

Release ≈ Container

● Release is the installed instance of a Chart

● Has unique name in a cluster

● Allows install, upgrade, rollback and delete operations.

Demo