Understanding YAML

 

Kubernetes resources are defined using YAML files.

Example:

apiVersion: v1

kind: Pod

metadata:

  name: nginx

spec:

  containers:

  - name: nginx

    image: nginx

YAML Structure

apiVersion

Which Kubernetes API version to use.

apiVersion: v1

kind

Resource type.

kind: Pod

kind: Service

kind: Deployment

metadata

Information about object.

metadata:

  name: nginx

spec

Desired state.

spec:

  containers:

Deployment Example

apiVersion: apps/v1

kind: Deployment

metadata:

  name: nginx-deployment

spec:

  replicas: 3

  selector:

    matchLabels:

      app: nginx

  template:

    metadata:

      labels:

        app: nginx

    spec:

      containers:

      - name: nginx

        image: nginx:latest

kubectl apply -f deployment.yaml

kubectl get deploy

kubectl get pods