What are some examples of Kubernetes deployments?

What are some examples of Kubernetes deployments?

Kubernetes deployments are used to manage a set of identical pods. Here are a few examples:

1. Nginx Deployment: A simple web server deployment.
2. MySQL Deployment: A database deployment with persistent storage.
3. Node.js Application: A deployment for a Node.js app with scaling capabilities.

Can you explain how to create a deployment for a Node.js app?

Sure! To create a deployment for a Node.js app, you can use the following YAML configuration:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nodejs-app
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nodejs
  template:
    metadata:
      labels:
        app: nodejs
    spec:
      containers:
      - name: nodejs
        image: node:14
        ports:
        - containerPort: 3000

This will create a deployment with 3 replicas of your Node.js application.

What is the purpose of the replicas field?

The replicas field specifies the number of pod instances that should be running at any given time. It helps ensure high availability and load balancing.

How can I update an existing deployment?

You can update an existing deployment by modifying the deployment YAML file and applying it using the command kubectl apply -f deployment.yaml. Alternatively, you can use kubectl set image to update the container image directly.