K
Q

While running a sample yml file in kubernetes i am facing this error.Could anyone help me in sorting out

1/23/2020
apiVersion: v1
kind: ReplicationController
metadata:
  name: simple-rc
spec:
  replicas: 2
  selector:
    app: nginx
  template:
    metadata:
      name: simple-rc
      labels:
        app: simple-rc
        version: "1.0"
    spec:
      containers:
        - name: simple-rc
          image: nginx
          ports:
            - containerPort: 80

error:

error validating "sample.yml": error validating data: 
ValidationError(ReplicationController.metadata): invalid type for io.k8s.apimachinery.pkg.apis.meta.v1.ObjectMeta: got "string", expected "map"; if you choose to ignore these errors, turn validation off with --validate=false
-- RISHI MALLIK
kubernetes
yaml

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2 Answers

1/23/2020

Please change

  selector:
    app: nginx

to

  selector:
    app: simple-rc

Also, please dont use replication controller it is obsolete, use Deployment instead

-- pr-pal
Source: StackOverflow
1/23/2020

The .spec.selector field is a label selector. A ReplicationController manages all the pods with labels that match the selector. It does not distinguish between pods that it created or deleted and pods that another person or process created or deleted. This allows the ReplicationController to be replaced without affecting the running pods.

If specified, the .spec.template.metadata.labels must be equal to the .spec.selector, or it will be rejected by the API. If .spec.selector is unspecified, it will be defaulted to .spec.template.metadata.labels.

spec:
  replicas: 2
  selector: # Update the selector to match labels
    app: simple-rc
    version: "1.0"
  template:
    metadata:
      name: simple-rc
      labels:
        app: simple-rc
        version: "1.0"
-- Kamol Hasan
Source: StackOverflow