How to Fix \"no kind \"Deployment\" is registered for version \"apps/v1beta1\"\" Error When Deserializing Kubernetes YAML?

How to Deserialize Kubernetes YAML File

Issue

You've encountered an error when attempting to deserialize a Kubernetes YAML file into a Go struct using the api.Codecs.UniversalDecoder().Decode function. The error reads, "no kind "Deployment" is registered for version "apps/v1beta1."

Understanding the Problem

When deserializing a Kubernetes YAML file, you must ensure that the schema of the object is registered. In this case, the Deployment object is registered under the apps/v1beta1 version of the API.

Solution

To resolve the issue, you need to import the package that registers the schema for the apps/v1beta1 version. This can be achieved by adding the following line to your code:

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

This import ensures that the schema for the Deployment object is registered and available for use during the deserialization process.

Working Example

Here's a modified working Go program that incorporates the necessary import:

<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: apps/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.UniversalDecoder().Decode
    obj, _, err := decode([]byte(service), nil, nil)
    if err != nil {
        fmt.Printf("%#v", err)
    }
    fmt.Printf("%#v\n", obj)
}</code>

When you run this program, the Deployment object should be successfully deserialized without encountering the aforementioned error.

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