Kubernetes - Replication, and Self-Healing

Kubernetes - Replication, and Self-Healing

I would like to explain what does self-healing means in terms of Kubernetes. Self-healing is a fantastic feature of Kubernetes to recover from service or node failure automatically. We will consider the benefit of using replication for your microservices and how the Kubernetes cluster can automatically recover from a service failure.

The benefit of using replication for your microservices and how the Kubernetes cluster can automatically recover from a service failure.

To start with, I would like to explain what does self-healing means in terms of Kubernetes. Self-healing is a fantastic feature of Kubernetes to recover from service or node failure automatically. In the following article, we will consider the benefit of using replication for your microservices and how the Kubernetes cluster can automatically recover from a service failure.

Prerequisite

One of the great features of Kubernetes is the ability to replicate pods and their underlying containers across the cluster. So, before we set up our self-healing feature please make sure you have managed replication, and here is a simple example of a deployment file that will deploy nginx container with replication factor 3:

apiVersion: apps/v1
kind: Deployment-example
metadata:
  name: nginx-deployment-example
  labels:
    app: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.15.4
        ports:
        - containerPort: 80

All right, so let's create the deployment:

kubectl create -f deployment.yaml

Now, let's check whether our nginx-deployment-example was created:

kubectl get deployments -n default

You should see your nginx-deployment-example deployment in the default namespace. If we want to see more details about those pods, please run the following command:

kubectl get pods -n default

We will see our 3 nginx-deployment-example pods:

NAME                                     READY   STATUS    RESTARTS   AGE
nginx-deployment-example-f4cd8584-f494x   1/1     Running   0          94s
nginx-deployment-example-f4cd8584-qvkbg   1/1     Running   0          94s
nginx-deployment-example-f4cd8584-z2bzb   1/1     Running   0          94s

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