Kubernetes Cookbook - Second Edition

Creating a ReplicaSet

When trying to use the command line to launch a Kubernetes Service immediately, we usually fire kubectl run. However, it would creates a Deployment by default, and not only taking care of the Pod replica but also providing a container-updating mechanism. To simply create a standalone ReplicaSet, we can exploit a configuration YAML file and run it:

$ cat my-first-replicaset.yamlapiVersion: extensions/v1beta1kind: ReplicaSetmetadata:  name: my-first-replicaset  labels:    version: 0.0.1spec:  replicas: 3  selector:    matchLabels:      project: My-Happy-Web      role: frontend  template:    metadata:      labels:        project: My-Happy-Web        role: frontend        env: dev    spec:      containers:      - name: happy-web        image: nginx:latest

The preceding file is the YAML for ...