A DevOps project

Scalable-deployments.md

Scalable Deployments in Kubernetes and more

In this project I deployed my personal web application on AWS EKS, which Kubernetes automatically horizontally scale up and scale down, Means the number of pods of my application in a node gets scaled up and scaled donw by an Autoscaler on the basis of resources load on each pod.

Used Technologies:

• AWS
• Kubernetes
• Docker
• ArgoCD
• Bash

Implementation details

• Created an ECR registry on AWS to store application container images.

• Created an AWS Pipeline that is triggered when an update happens to the repository personal-web and an container image is built by the AWS PipeLine and pushed to the created ECR registry.

• Then created a deployment of my web application inside k8s cluster with a ClusterIP service.

  apiVersion: apps/v1
  kind: Deployment
  metadata:
    name: personal-web-deployment
    labels:
      app: personal-web
  spec:
    replicas: 1
    selector:
      matchLabels:
        app: personal-web
    template:
      metadata:
        labels:
          app: personal-web
      spec:
        imagePullSecrets:
          - name: docker-registry-secret
        containers:
          - name: personal-web
            image: mdsahiloss/personal-web:latest
            ports:
              - containerPort: 3000
  ---
  apiVersion: v1
  kind: Service
  metadata:
    name: personal-web-svc
    labels:
      app: personal-web
  spec:
    type: ClusterIP
    ports:
      - name: http
        protocol: TCP
        port: 80
        targetPort: 3000
    selector:
      app: personal-web
  

• Then created an Autoscaler inside Kubernetes configuired by AWS EKS that scale up and scale down number of pods of my application deployment on the basis of load on my each pod.

  $ kubectl autoscale deployment personal-web-deployment --cpu-percent=80 --min=1 --max=10

• Then configured an Ingress inside Kubernetes cluster (that Nginx ingress controller handles) that allows users to access the running web application inside Kubernetes cluster from outside of cluster.

  apiVersion: networking.k8s.io/v1
  kind: Ingress
  metadata:
   name: personal-web-ingress
  spec:
   ingressClassName: nginx
   rules:
     - host: mdsahil-oss.me
       http:
         paths:
           - path: /
             pathType: Prefix
             backend:
               service:
                 name: personal-web-svc
                 port:
                   number: 80
  

• Then, I Obtained a load balancer service domain to access the web site, which was very ugly. So, I linked that load-balancer domain name with my own domain name mdsahil-oss.me using [namecheap](https://www.namecheap.com/) web tool to access the website using domain mdsahil-oss.me.