DEPLOYING WORDPRESS ON TOP OF AWS EKS CLUSTER WITH MANAGED KUBERNETES MASTER

Amazon Elastic Kubernetes Service

Amazon kubernetes services are fully managed services for kubernetes. These are fully certified kubernetes conformant so we can use all benefits of open source tooling from community. Current EKS supports K8s v1.14,1.15,1.16(default).

Some prerequisites are as follows-

• A Workspace installed with aws cli v2, eksctl, kubectl command configured.
• An IAM user with Administrative power.
• A key for SSH.
• Selecting Region of Deploying Cluster.

Now time to hands on Deployment of Wordpress-

• Firstly we will create these files amancluster.yml, kustomization.yml, wordpress-deployment.yml, mysql-deployment.
• My amancluster.yml is as below-

apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig


metadata:
  name: amancluster
  region: ap-south-1


nodeGroups:
   - name: ng1
     desiredCapacity: 2
     instanceType: t2.micro
     ssh:
        publicKeyName: saman
   - name: ng2
     desiredCapacity: 1
     instanceType: t2.small
     ssh:
        publicKeyName: saman
   - name: ng-mixed
     minSize: 2
     maxSize: 5
     instancesDistribution:
       maxPrice: 0.017
       instanceTypes: ["t3.small", "t3.medium"] # At least one instance type should be specified
       onDemandBaseCapacity: 0
       onDemandPercentageAboveBaseCapacity: 50
       spotInstancePools: 2     
     ssh:
         publicKeyName: saman

• We have to open command prompt of windows.
• Now go to directory where yml files(amancluster.yml, kustomization.yml, wordpress-deploy.yml, mysql-deploy.yml) to be used are saved.
• amancluster.yml-contains yml code to launch cluster on EKS.
• Kustomization.yml-contains order of deployment and secret.
• wordpress-deploy.yml-contains wordpress deployment code.
• mysql-deploy.yml-contains my sql deployment code with three parts as services,pvc claim and Deployment part.
• Now run aws configure command and give your IAM user credentials.

aws configure command 

The screen will appear like this

• Now run eksctl create cluster cluster.yml to launch eks cluster.

eksctl create cluster cluster.yml

After running this command the screen will appear like this and will launch cluster in approximate 20 minutes

• Now we will scale the cluster nodegroup using command eksctl scale nodegroup cluster amancluster --name ng2 --nodes=3 --nodes-max=5

 eksctl scale nodegroup cluster amancluster --name ng2 --nodes=3 --nodes-max=5

The screen will appear like this

• The subnet page on aws web ui will look like this-

• all nodes created are as

• We will first create wordpress-deploy.yml file-

This code has three parts, services part will create a load balancer to control the traffic between nodes.the pvc created using second part is of size 20 gi and will be mounted to the folder /var/www/html. third part contains deployment which monitors pods,autoscaling etc.

apiVersion: v1
kind: Service
metadata:
  name: wordpress
  labels:
    app: wordpress
spec:
  ports:
    - port: 80
  selector:
    app: wordpress
    tier: frontend
  type: LoadBalancer
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: wp-pv-claim
  labels:
    app: wordpress
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 20Gi
---
apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
kind: Deployment
metadata:
  name: wordpress
  labels:
    app: wordpress
spec:
  selector:
    matchLabels:
      app: wordpress
      tier: frontend
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: wordpress
        tier: frontend
    spec:
      containers:
      - image: wordpress:4.8-apache
        name: wordpress
        env:
        - name: WORDPRESS_DB_HOST
          value: wordpress-mysql
        - name: WORDPRESS_DB_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysql-pass
              key: password
        ports:
        - containerPort: 80
          name: wordpress
        volumeMounts:
        - name: wordpress-persistent-storage
          mountPath: /var/www/html
      volumes:
      - name: wordpress-persistent-storage
        persistentVolumeClaim:
          claimName: wp-pv-claim

After creating wordpress-deploy file we will will create mysql-deploy.yml

This code of database file has also three parts first part services will create a cluster ip for connecting to the database.the second contains pvc creation and mounting of it on top of folder /var/lib/mysql. and the last part contains deployment to monitor pods.

apiVersion: v1
kind: Service
metadata:
  name: wordpress-mysql
  labels:
    app: wordpress
spec:
  ports:
    - port: 3306
  selector:
    app: wordpress
    tier: mysql
  clusterIP: None
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: mysql-pv-claim
  labels:
    app: wordpress
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 20Gi
---
apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
kind: Deployment
metadata:
  name: wordpress-mysql
  labels:
    app: wordpress
spec:
  selector: 
    matchLabels:
      app: wordpress
      tier: mysql
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: wordpress
        tier: mysql
    spec:
      containers:
      - image: mysql:5.6
        name: mysql
        env:
        - name: MYSQL_ROOT_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysql-pass
              key: password
        ports:
        - containerPort: 3306
          name: mysql
        volumeMounts:
        - name: mysql-persistent-storage
          mountPath: /var/lib/mysql
      volumes:
      - name: mysql-persistent-storage
        persistentVolumeClaim:
          claimName: mysql-pv-claim

• Finally we will create kustomization.yml which contains sequence and secrets.

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
secretGenerator:
- name: mysql-pass
  literals:
  - password=redhat
resources:
  - mysql-deploy.yaml

  - wordpress-deploy.yaml 

• Now the time time to finally run this file came using command kubectl create -k .

 kubectl create -k .

The screen will appear like this

This command is launching all files in sequences and will finally launch pods of wordpress, mysql, services, pv , pvc.

• now run this command to get curl of your wordpress-

kubectl get all

• Finally copy the link and open it in browser.

The wordpress will appear like this and select language

Now enter your database credentials

Finally the wordpress appear like this..

Finally i have deployed wordpress on aws eks fully managed services. This was all possible due to the effort of world record holder Mr. Vimal Daga Sir and his great guidance and mentorship. He has a deep knowledge of everything he taught and we fully enjoyed all the things and technology he taught us . I will be very grateful to sir for all of this he has done with only vision of making youth and India Future Ready.

SIR WE WILL SURELY BE FUTURE READY UNDER YOUR GUIDANCE

THANK YOU

LINUX WORLD

AND

MR. VIMAL DAGA SIR