Creating Kubernetes Replication Controller in 5 Minutes

Let’s look at the following diagram to create Kubernetes Replication Controller:

What to remember when creating ReplicationController

• apiVersion: v1
• You can define number of replicas, selector and template under spec
• spec->template has its own spec section along side metadata
• You specify containers’ related attributes under template‘s spec

Create ReplicationController YAML file example

apiVersion: v1
kind: ReplicationController
metadata:
  name: nginx
spec:
  replicas: 3
  selector:
    app: nginx
  template:
    metadata:
      name: nginx
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx
        ports:
        - containerPort: 80

apiVersion: v1

kind: ReplicationController

metadata:

  name: nginx

spec:

  replicas: 3

  selector:

    app: nginx

  template:

    metadata:

      name: nginx

      labels:

        app: nginx

    spec:

      containers:

      - name: nginx

        image: nginx

        ports:

        - containerPort: 80

​

Đạt Trần

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