AWS EKS

EKS Overview

• Service managed by Amazon that allows us to run Kubernetes on AWS, without having to manage the infra

Create a cluster

eksctl create cluster \
--name my-cluster \
--region region-name \
--fargate

...
[✓]  EKS cluster "my-cluster" in "region-name" region is ready

Above line tells the cluster is ready to use in the given region

2. After successful creation of cluster, in ~/.kube/config we can see cluster details, like below

- name: chiras@cisco.com@chiras-eks-cluster1.ap-south-1.eksctl.io
  user:
    exec:
      apiVersion: client.authentication.k8s.io/v1alpha1
      args:
      - token
      - -i
      - chiras-eks-cluster1
      command: aws-iam-authenticator
      env:
      - name: AWS_STS_REGIONAL_ENDPOINTS
        value: regional
      - name: AWS_DEFAULT_REGION
        value: ap-south-1

3. View your cluster nodes

kubectl get nodes -o wide

4. View workloads on the cluster

kubectl get pods --all-namespaces -o wide

Deploy a sample application

1. Create a namespace

kubectl create namespace <my-namespace>

2. Create a K8s Service and Deployment using a YAML file

apiVersion: v1
kind: Service
metadata:
  name: my-service
  namespace: my-namespace
  labels:
    app: my-app
spec:
  selector:
    app: my-app
  ports:
    - protocol: TCP
      port: 80
      targetPort: 80
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-deployment
  namespace: my-namespace
  labels:
    app: my-app
spec:
  replicas: 3
  selector:
    matchLabels:
      app: my-app
  template:
    metadata:
      labels:
        app: my-app
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: beta.kubernetes.io/arch
                operator: In
                values:
                - amd64
                - arm64
      containers:
      - name: nginx
        image: public.ecr.aws/z9d2n7e1/nginx:1.19.5
        ports:
        - containerPort: 80

3. Deploy the application

kubectl apply -f <sample-service.yaml>

4. View the resources in the namespace

kubectl get all -n my-namespace