Helm Lab

Lab Overview

In this lab we will install Helm CLI tool, add helm repository, use helm CLI tool to template kubernetes .yaml files.

Helm Templating

Templating a chart

1. Install the Helm CLI

mkdir -p ~/Desktop/configlabs
cd ~/Desktop/configlabs
curl https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3 | bash

1. Add a helm chart repository

helm repo add oteemocharts https://oteemo.github.io/charts

1. Update your local helm repositories

helm repo update

1. Template out to a single file
   verify that you are in the correct directory (should be ~/Desktop/configlabs)

   pwd 
   helm template oteemocharts/sonarqube > generated.yaml
   

2. View contents of the generated file

   cat generated.yaml 
   

   This file should have Secret, ConfigMap, Service, Deployment, StatefulSet, and pod objects.
   These kubernetes object files are all in one single .yaml file separated by --- file deliminator

To view the individual kubernetes objects

 cat generated.yaml | grep -i kind:

Your output should look like this

 kind: Secret
 kind: ConfigMap
 kind: ConfigMap
 kind: ConfigMap
 kind: ConfigMap
 kind: ConfigMap
 kind: Service
 kind: Service
 kind: Service
 kind: Deployment
 kind: StatefulSet
 kind: Pod

1. Template out to multiple files

   Another way to generate would be to a directory, this allows us to have a more manageable way to view all the resources needed for an application

   helm template sonar oteemocharts/sonarqube --output-dir generated
   

2. View files created

   ls -R generated
   

   This will have all the same contents, just split up over the different files

Other ways to interact with Helm

Official Helm Docs