Kubernetes mysql Installation (helm)

Posted on Friday Jnauary 11, 2019

Introduction

In this section we will learn how to install and setup mysql in kubernetes cluster using helm

First define the PersistentVolume mysql-pv where the mysql data to be stored. The hostPath tells the mysql directory is in /opt/mysql location

root@kube-master:# cat mysqldb-hostpath.yaml 
apiVersion: v1
kind: PersistentVolume
metadata:
  name: mysql-pv
spec:
  capacity: 
    storage: 2Gi
  accessModes:
    - ReadWriteOnce
    - ReadOnlyMany
  persistentVolumeReclaimPolicy: Retain
  hostPath:
    path: /opt/mysql

Create PersistentVolume in kube cluster

root@kube-master:/home/ansible# kubectl create -f  mysqldb-hostpath.yaml 
persistentvolume/mysql-pv created

Check the PersistentVolume mysql-pv is available for use

root@kube-master:/home/ansible# kubectl get pv 
NAME       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS      CLAIM     STORAGECLASS   REASON    AGE
mysql-pv   1Gi        RWO,ROX        Retain           Available                                      15s

Define PersistentVolumeClaim mysql-pvc

root@kube-master:/home/ansible# cat mysqldb-pvc.yaml 
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: mysql-pvc
spec:
  storageClassName: ""
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi

create PersistentVolumeClaim mysql-pvc in kube cluster

root@kube-master:/home/ansible# kubectl create -f  mysqldb-pvc.yaml 
persistentvolumeclaim/mysql-pvc created

Check the PersistentVolumeClaim mysql-pvc is bounded to mysql-pv

root@kube-master:/home/ansible# kubectl get pvc
NAME        STATUS    VOLUME     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
mysql-pvc   Bound     mysql-pv   1Gi        RWO,ROX                       6s

MYSQL Installation starts here, this is done through helm the kubernetes package manager,

helm install --name mysql --set
mysqlRootPassword=rootpassword,mysqlUser=mysql,mysqlPassword=my-password,mysqlDatabase=mydatabase,persistence.existingClaim=mysql-pvc stable/mysql

while setting up mysql cluster the persistence.existingClaim=mysql-pvc is set which we have created earlier.

root@kube-master:# helm install --name mysql --set mysqlRootPassword=rootpassword,mysqlUser=mysql,mysqlPassword=my-password,mysqlDatabase=mydatabase,persistence.existingClaim=mysql-pvc stable/mysql

NAME:   mysql
LAST DEPLOYED: Thu Jan 10 16:18:31 2019
NAMESPACE: default
STATUS: DEPLOYED

RESOURCES:
==> v1beta1/Deployment
NAME   DESIRED  CURRENT  UP-TO-DATE  AVAILABLE  AGE
mysql  1        0        0           0          1s

==> v1/Pod(related)
NAME                    READY  STATUS   RESTARTS  AGE
mysql-7b688448b9-pxml5  0/1    Pending  0         1s

==> v1/Secret
NAME   TYPE    DATA  AGE
mysql  Opaque  2     1s

==> v1/ConfigMap
NAME        DATA  AGE
mysql-test  1     1s

==> v1/Service
NAME   TYPE       CLUSTER-IP     EXTERNAL-IP  PORT(S)   AGE
mysql  ClusterIP  10.100.139.57  <none>       3306/TCP  1s


NOTES:
MySQL can be accessed via port 3306 on the following DNS name from within your cluster:
mysql.default.svc.cluster.local

To get your root password run:

    MYSQL_ROOT_PASSWORD=$(kubectl get secret --namespace default mysql -o jsonpath="{.data.mysql-root-password}" | base64 --decode; echo)

To connect to your database:

1. Run an Ubuntu pod that you can use as a client:

    kubectl run -i --tty ubuntu --image=ubuntu:16.04 --restart=Never -- bash -il

2. Install the mysql client:

    $ apt-get update && apt-get install mysql-client -y

3. Connect using the mysql cli, then provide your password:
    $ mysql -h mysql -p

To connect to your database directly from outside the K8s cluster:
    MYSQL_HOST=127.0.0.1
    MYSQL_PORT=3306

    # Execute the following command to route the connection:
    kubectl port-forward svc/mysql 3306

    mysql -h ${MYSQL_HOST} -P${MYSQL_PORT} -u root -p${MYSQL_ROOT_PASSWORD}

root@kube-master:# kubectl get pods  --watch
NAME                           READY     STATUS      RESTARTS   AGE
my-sql-mysql-95b597d5b-zd5pm   0/1       Init:0/1    0          5s
ubuntu                         0/1       Completed   0          7m
my-sql-mysql-95b597d5b-zd5pm   0/1       PodInitializing   0         12s
my-sql-mysql-95b597d5b-zd5pm   0/1       Running   0         13s

Once the my-sql POD is up and running , your mysql is ready to use

To get your root password run

root@kube-master:/home/ansible# MYSQL_ROOT_PASSWORD=$(kubectl get secret --namespace default mysql -o jsonpath="{.data.mysql-root-password}" | base64 --decode; echo)
root@kube-master:/home/ansible# echo $MYSQL_ROOT_PASSWORD
rootpassword

To connect to your database directly from outside the K8s cluster

kubectl port-forward svc/mysql 3306
MYSQL_HOST=127.0.0.1
MYSQL_PORT=3306
mysql -h ${MYSQL_HOST} -P${MYSQL_PORT} -u root -p${MYSQL_ROOT_PASSWORD}

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