adityakron/k8s-cluster

Using KIND deployed K8S 2 node cluster

Install Kind Command

$ curl -L https://github.com/kubernetes-sigs/kind/releases/download/v0.8.1/kind-linux-amd64 -o kind

$ chmod +x ./kind

$ sudo mv ./kind /usr/local/bin/kind

Install Docker on machine

1. Update existing listed packages

$ sudo apt update

2. Install a few prerequisite packages which let apt use packages over HTTPS.

$ sudo apt install apt-transport-https ca-certificates curl software-properties-common

3. Then add the GPG key for the official Docker repository to system.

$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

4. Add the Docker repository to APT sources

$ sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable"

5. Update the package database with the Docker packages from the newly added repo

$ sudo apt update

6. Install from the Docker repo instead of the default Ubuntu repo

$ apt-cache policy docker-ce

7. Install docker

$ sudo apt install docker-ce

8. Checked Docker installed

$ sudo systemctl status docker

Install Kubectl

$ curl -LO https://storage.googleapis.com/kubernetes-release/release/`curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt` /bin/linux/amd64/kubectl

$ chmod +x ./kubectl

Creating Cluster

1. Create the File using this content adn with yaml extension

$ echo "" >> kind.config.yaml

kind: Cluster apiVersion: kind.sigs.k8s.io/v1alpha3 nodes:

• role: control-plane extraPortMappings:
  • containerPort: 30080 hostPort: 80 listenAddress: "0.0.0.0" protocol: TCP
• role: worker1
• role: worker2

2. Create cluster using Kind command , The extra port mapping is required to allow us to talk to the webserver

$ kind create cluster --name mycluster --config kind.config.yaml --wait 5m

3. Cluster is created , Using following command check the cluster

$ sudo kind get clusters

Deploying webapplication on k8s

1. Create deployment file with extension .yaml

apiVersion: apps/v1 kind: Deployment metadata: labels: app: example1 name: example1 spec: replicas: 1 selector: matchLabels: app: example1 template: metadata: labels: app: example1 spec: containers: - image: nginx:latest name: nginx ports: - containerPort: 80 name: nginx

$ sudo kubectl apply -f helloworld.yaml

2. Check pod is up and running

$ sudo kubectl get pods

3. Check logs of th ppod

$ sudo kubectl logs (pod name)

Create the Service

1. Create service file first

$ echo "apiVersion: v1 >> helloservice.yaml kind: Service metadata: name: helloworld labels: app: helloworld spec: type: NodePort selector: app: helloworld ports: - protocol: TCP targetPort: 80 port: 80 nodePort: 30080"

2. Apply service

$ sudo kubectl apply -f helloservice.yaml

3. Check services using following command

$ sudo kubectl get services

5. Now check using curl command on localhost nginx is running

$ sudo curl localhost

Change Content

1)Enter in the running pod using following command

$ sudo kubectl exec -it $podname bash

2. Under pod go to the path /usr/share/nginx/html

$ cd /usr/share/nginx/html

3. change the content of a index.html file

$ echo "hello world" >> index.html

4. check using curl commadn on host machine content is change or not .

$ curl localhost

AWS cluster

1. launch Ubuntu 18.04 free tier instance and configure it and run the script on it .