Deploying Reddit Copy on Kubernetes Cluster using Ingress.

Prerequisites:

?????????? EC2 (AMI- Ubuntu, Type- t2.medium)

?????????? Docker

?????????? Minikube

?????????? Kubectl

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Follow below steps for install all necessary prerequisite:

#Docker Installation steps

sudo apt-get update

sudo apt-get install docker.io -y

sudo usermod -aG docker $USER && newgrp docker        

# For Minikube & Kubectl

sudo install minikube-linux-amd64 /usr/local/bin/minikube

sudo snap install kubectl –classic

minikube start --driver=docker        

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Clone the source code:

git clone https://github.com/LondheShubham153/reddit-clone-k8s-ingress.git        

Building Docker Image:

You can build docker image using below commands:

docker build -t <DockerHub_Username>/<Imagename> .        

?

docker build -t trainwithshubham/reddit-clone .

or

docker build -t ashraw10/reddit-clone .        

Push the image to Docker hub

First you have to login on Docker hub using below command

docker login ?

give username and password.        

Write a Kubernetes Manifest File

When you are going to deploy to Kubernetes or create Kubernetes resources like a pod, replica-set, config map, secret, deployment, etc., you need to write a file called manifest that describes that object and its attributes either in yaml or json.

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Let’s create a Deployment file for our Application

Using the following code for the Deployement.yml file

apiVersion: apps/v1
kind: Deployment
metadata:
  name: reddit-clone-deployment
  labels:
    app: reddit-clone
spec:
  replicas: 2
  selector:
    matchLabels:
      app: reddit-clone
  template:
    metadata:
      labels:
        app: reddit-clone
    spec:
      containers:
      - name: reddit-clone
        image: trainwithshubham/reddit-clone
        ports:
        - containerPort: 3000
        

Write Service.yml file

apiVersion: v1
kind: Service
metadata:
  name: reddit-clone-service
  labels:
    app: reddit-clone
spec:
  type: NodePort
  ports:
  - port: 3000
    targetPort: 3000
    nodePort: 31000
  selector:
    app: reddit-clone
        

Deploy the app to Kubernetes & Create a Service for It

Now, we have a deployment file for our app and we have a running Kubernetes cluster. We can deploy the app to Kubernetes.

Run following command:

kubectl apply -f deployment.yml

kubectl apply -f service.yml        

?Check your deployment and services using below command:

kubectl get deployment -o wide

kubectl get services -o wide        

Let's Configure Ingress

Ingress in Kubernetes:

Pods and services in Kubernetes have their own IP; however, it is normally not the interface you'd provide to the external internet. Though there is a service with node IP configured, the port in the node IP can't be duplicated among the services. It is cumbersome to decide which port to manage with which service. Furthermore, the node comes and goes, it wouldn't be clever to provide a static node IP to an external service. Ingress defines a set of rules that allows the inbound connection to access Kubernetes cluster services. It brings the traffic into the cluster at L7 and allocates and forwards a port on each VM to the service port.

Write ingress.yml file using below code:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ingress-reddit-app
spec:
  rules:
  - host: "domain.com"
    http:
      paths:
      - pathType: Prefix
        path: "/test"
        backend:
          service:
            name: reddit-clone-service
            port:
              number: 3000
  - host: "*.domain.com"
    http:
      paths:
      - pathType: Prefix
        path: "/test"
        backend:
          service:
            name: reddit-clone-service
            port:
              number: 3000
        

Apply the ingress.yml using below commands:

Kubectl apply –f ingress.yml        

Use below command to verify ingress is running correctly:

kubectl get ingress ingress-reddit-app        

To check ingress status used below command:

Kubectl get ingress –o wide        

Test Ingress:

Now It's time to test your ingress so use the?curl -L domain/test?command in the terminal.

Note: open the 3000 port in a security group of your Ec2 Instance

Used Ec2_ip to see the deployed application on browser using

EC2_ip:3000

You have successfully deployed the Reddit clone app using ingress on Kubeadm cluster.

Thank you all!