Scenario-301

Table of Contents

• Requirements
• Background & Highlights
• Procedures
  • Start minikube env
  • Install and run helm
  • Verify Deployment
  • Clean up
• More resources

Requirements

Scenario-301: Use helm To Deploy Service I

• Objective: Know the basic usage of helm
• Requirements:

1. Use helm to deploy a mysql service with single instance
2. Customize helm deployment: configure mysql root password

Background & Highlights

• What's Helm? Why we need Helm?

Helm is the Kubernetes Package Manager.
Community provides well-organized deployment solutions for typical services

• Our focus is helm, thus we use mninikube for this study

Procedures

Start minikube env

minikube start

Install and run helm

https://github.com/kubernetes/helm

https://github.com/kubernetes/charts/tree/master/stable/mysql

• Start Helm

cd challenges-kubernetes/Scenario-301/
helm init
helm repo update
helm list

• Create volume for mysql

Create folder to hold the data

minikube ssh

sudo mkdir -p /data
sudo chmod 777 /data
exit

Create pv with pv.yaml

kubectl apply -f ./pv.yaml

• Run helm Deployment

export mysqlRootPassword="secretpassword"
helm install --name mysql-release \
  --set mysqlRootPassword=${mysqlRootPassword},mysqlUser=my-user,mysqlPassword=my-password,mysqlDatabase=my-database \
    stable/mysql

Verify Deployment

helm status mysql-release

kubectl get pvc
kubectl get pv
kubectl get pod

export mysqlRootPassword="secretpassword"
kubectl run -i --tty --rm mysql-client  --image=mysql --restart=Never -- mysql -hmysql-release-mysql -uroot -p${mysqlRootPassword}
show databases;

Press Ctrl+D to exit

## ,----------- Example
## | Denny-Laptop:~ mac$ kubectl run -i --tty --rm mysql-client --image=mysql --restart=Never -- mysql -hmysql-release-mysql -uroot -psecretpassword
## | If you don't see a command prompt, try pressing enter.
## | 
## | mysql> show databases;
## | +--------------------+
## | | Database           |
## | +--------------------+
## | | information_schema |
## | | my-database        |
## | | mysql              |
## | | performance_schema |
## | | sys                |
## | +--------------------+
## | 5 rows in set (0.00 sec)
## `-----------

Clean up

helm delete --purge mysql-release
kubectl delete -f ./pv.yaml
minikube delete

More resources

https://github.com/kubernetes/helm
https://github.com/kubernetes/charts/tree/master/stable/mysql