How to Deserialize Kubernetes YAML Files into Go Structs: Why Do I Get the Error \"no kind \'Deployment\' is registered for version \'apps/v1beta1\'\"?

Deserializing Kubernetes YAML Files in Go

Problem:

Deserialize a Kubernetes YAML file into a Go struct.

Error Encountered:

no kind "Deployment" is registered for version "apps/v1beta1"

Solution:

To resolve the error, you need to import the necessary Kubernetes schema package. This instructs the decoder which types it should consider when deserializing the YAML.

Import the following package:

<code class="go">_ "k8s.io/client-go/pkg/apis/extensions/install"</code>

Reason:

The Kubernetes schema is not automatically registered with the decoder. By importing the install package, you explicitly register the schema for the extensions/v1beta1 API group, which includes the Deployment resource type.

Complete Working Example:

<code class="go">package main

import (
    "fmt"

    "k8s.io/client-go/pkg/api"
    _ "k8s.io/client-go/pkg/api/install"
    _ "k8s.io/client-go/pkg/apis/extensions/install"
)

var service = `
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: my-nginx
spec:
  replicas: 2
  template:
    metadata:
      labels:
        run: my-nginx
    spec:
      containers:
      - name: my-nginx
        image: nginx
        ports:
        - containerPort: 80
`

func main() {
    decode := api.Codecs.UniversalDeserializer().Decode

    obj, _, err := decode([]byte(service), nil, nil)
    if err != nil {
        panic(err)
    }

    fmt.Printf("%#v\n", obj)
}</code>

Note:

In the updated example, the Deployment resource is defined using the extensions/v1beta1 API group, which is the correct API group for the Deployment resource in Kubernetes versions prior to 1.9. For Kubernetes 1.9 and later, you should use the apps/v1 API group instead.

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