Difficulty: beginner
Estimated Time: 10-15 minutes

In this scenario, you'll learn how to use Kubectl to create and launch Deployments, Replication Controllers and expose them via Services by writing yaml definitions.

YAML definitions define the Kubernetes Objects that become scheduled for deployment. The objects can be updated and redeployed to the cluster to change the configuration.

Deploy Containers Using YAML

Step 1 of 3

Step 1 - Create Deployment

One of the most common Kubernetes object is the deployment object. The deployment object defines the container spec required, along with the name and labels used by other parts of Kubernetes to discover and connect to the application.

Task

Copy the following definition to the editor. The definition defines how to launch an application called webapp1 using the Docker Image katacoda/docker-http-server that runs on Port 80.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: webapp1
spec:
  replicas: 1
  selector:
    matchLabels:
      app: webapp1
  template:
    metadata:
      labels:
        app: webapp1
    spec:
      containers:
      - name: webapp1
        image: katacoda/docker-http-server:latest
        ports:
        - containerPort: 80

This is deployed to the cluster with the command kubectl create -f deployment.yaml

As it's a Deployment object, a list of all the deployed objects can be obtained via kubectl get deployment

Details of individual deployments can be outputted with kubectl describe deployment webapp1

deployment.yaml
service.yaml
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