Helm Basic Tutorial.txt

Helm Tutorial:
==============

- ~/.kube/config <=> helm
- ~/.helm - Helm Configuration
- ServiceAccount for helm to talk to the cluster


Components:
===========

    - Helm - Binary
    - Tiller - Pod - Takes care of all Deployment
    
Helm:
=====

    - Deploy packages to cluster
    - Packages are called charts

Helm commands:
==============

helm help
helm install
helm fetch
helm list
helm status
helm search
helm repo update
helm upgrade
helm rollback
helm delete --purge
helm reset  --force

mkdir .kube
kubectl cluster-info
kubectl get nodes
kubectl version --short
kubectl get all

Download Helm Binary and extract it
------------------------------------

sudo mv helm /usr/local/bin
which helm
helm version --short --client


kubectl -n kube-system create serviceaccount tiller
kubectl create clusterrolebinding tiller --clusterrole cluster-admin --serviceaccount=kube-system:tiller
kubectl get clusterrolebinding tiller


helm init --serviceaccount tiller
kubectl -n kube-system get pods


helm repo list
helm list

helm search jenkins
helm inspect jenkins 
helm fetch stable/jenkins

kubectl -n kube-system get deploy,replicaset,pod,serviceaccount,clusterrolebinding | grep tiller

helm reset
helm home

kubectl -n kube-system delete rs tiller-deploy

sudo rm -rf /usr/local/bin/tiller


Create your first Helm chart
-----------------------------

helm version --short 
helm create myapp
mkdir charts
cd charts
mkdir my-nginx
cd my-nginx
vi Chart.yaml - Note uppercase letter C


apiVersion: v1
name: my-nginx
version: 0.1.0
appVersion: 1.0
description: My Custom nginx chart
tillerversion : ">2.14.0"


tree

mkdir templates
kubectl create deploy deploy my-nginx --image nginx

kubectl create deploy my-nginx --image  nginx  --dry-run -o yaml > /charts/my-nginx/templates/deployment.yaml - Creates Deployment file

kubectl delete deploy nginx

kubectl get all


helm install --name nginx .

kubectl expose deploy my-nginx --port 80 --dry-run -o yaml > templates/service.yaml


helm list
vi Chart.yaml 
helm upgrade my-nginx .
helm rollback my-nginx 1
helm del --purge my-nginx


Deploy helm charts to chart repo and your team start using it
-------------------------------------------------------------

vi values.yaml
replicaCount: 1
service:
    type: NodePort



vi/templates/deployment.yaml
replicas: {{ .Values.deployment }}

helm install --name my-nginx . --set replicaCount=2

helm inspect values . 
helm upgrade my-nginx . --set replicaCount=2

vi templates/service.yaml
type: {{ .Values.service.type}}


vi Chart.yaml => Change Version
helm list
helm upgrade my-nginx .
helm list
helm upgrade my-nginx .


helm create myapp