Replication Controller

Create rc-definition.yml file. be careful of tabs and indents.

# cat rc-definition.yml
apiVersion: v1
kind: ReplicationController
metadata:
  name: myapp-rc
  labels:
      app: myapp
      type: front-end

spec:
 template:

     metadata:
        name: myapp-prod
        labels:
          app: myapp
          type: front-end
     spec:
       containers:
         - name: nginx-controller
           image: nginx
 replicas: 2

Run below command to create the pods

# kubectl create -f rc-definition.yml

replicationcontroller/myapp-rc created

when you run the above commands, errors like the below may come if the indentation is incorrect, or there is a array instead of a map

error: error parsing rc-definition.yml: error converting YAML to JSON: yaml: line 6: found character that cannot start any token

error: error parsing rc-definition.yml: error converting YAML to JSON: yaml: line 16: found a tab character that violates indentation

error: error validating "rc-definition.yml": error validating data: ValidationError(ReplicationController.spec): invalid type for io.k8s.api.core.v1.ReplicationControllerSpec: got "array", expected "map"; if you choose to ignore these errors, turn validation off with --validate=false

# kubectl get replicationcontroller
NAME       DESIRED   CURRENT   READY   AGE
myapp-rc   2         2         2       14m

# kubectl get pods
NAME                       READY   STATUS    RESTARTS   AGE
myapp-rc-69v2d             1/1     Running   0          14m
myapp-rc-fw8z4             1/1     Running   0          14m
mynginx-6b7b7bcd75-l7jwv   1/1     Running   1          25h

nginx-7cdbd8cdc9-g2tcv     1/1     Running   2          9d