Question 372179 in Nginx Question posted in
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Nginx – Kubernetes error when creating replicaset application

I tried to create replicaset application file in the terminal but ends up with an error saying Error from server (BadRequest): error when creating "replicaset-definition.yaml": ReplicaSet in version "v1" cannot be handled as a ReplicaSet: strict decoding error: unknown field "replicas", unknown field "selector". Can anyone help me fix this issue? Thanks

apiVersion: apps/v1
kind: ReplicaSet
metadata:
  name: myapp-replicaset
  labels:
      app: myapp
      type: front-end

spec:
  template:

    metadata:
     name: myapp-pod
     labels:
        app: myapp
        type: front-end
    spec:
      containers:
      - name: nginx-container
        image: nginx

replicas: 3
selector:
   matchLabels:
      type: front-end
Tags:

2

Answers


  1. 0

    You can type

    kubectl explain replicaset

    to get a description for the ReplicaSet type.

    Your fields replicas and selector needs one more indentation level.

    E.g.

    Like this:

    spec:
    template:
    replicas:
    selector:
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  2. 0

    In your case it should looks like:

    
apiVersion: apps/v1
kind: ReplicaSet
metadata:
  name: myapp-replicaset
  labels:
      app: myapp
      type: front-end

spec:
  template:

    metadata:
     name: myapp-pod
     labels:
        app: myapp
        type: front-end
    spec:
      containers:
      - name: nginx-container
        image: nginx

  replicas: 3
  selector:
    matchLabels:
      type: front-end

    You can use one of k8s syntax validation tools, for example kubeval, for checking yaml files for this kind of issues.

    Alexanders-MacBook-Pro:~ alexander$ kubeval tst.yaml
PASS - tst.yaml contains a valid ReplicaSet (myapp-replicaset)
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