以下是一个示例程序，用于生成操作Kubernetes自定义资源（CR）的Golang代码。该程序使用了Kubernetes API中的client-go库来实现。
package main
import (
"fmt"
"io/ioutil"
apiextensionsv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
serializer "k8s.io/apimachinery/pkg/runtime/serializer/json"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
)
func main() {
// Create a Kubernetes client.
config, err := rest.InClusterConfig()
if err != nil {
config, err = clientcmd.BuildConfigFromFlags("", "/path/to/kubeconfig")
if err != nil {
panic(err.Error())
}
}
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
panic(err.Error())
}
// Define the CR object schema.
crd := &apiextensionsv1.CustomResourceDefinition{
ObjectMeta: metav1.ObjectMeta{
Name: "example.com",
},
Spec: apiextensionsv1.CustomResourceDefinitionSpec{
Group: "example.com",
Version: "v1alpha1",
Names: apiextensionsv1.CustomResourceDefinitionNames{
Plural: "examples",
Singular: "example",
Kind: "Example",
},
Scope: apiextensionsv1.NamespaceScoped,
Versions: []apiextensionsv1.CustomResourceDefinitionVersion{{
Name: "v1alpha1",
Served: true,
Storage: true,
}},
},
}
// Serialize the CR object schema to YAML.
s := runtime.NewScheme()
if err := scheme.AddToScheme(s); err != nil {
panic(err.Error())
}
codecs := serializer.NewCodecFactory(s)
obj, err := runtime.DefaultUnstructuredConverter.ToUnstructured(crd)
if err != nil {
panic(err.Error())
}
u := &unstructured.Unstructured{Object: obj}
yamlBytes, err := runtime.Encode(codecs.LegacyCodec(apiextensionsv1.SchemeGroupVersion), u)
if err != nil {
panic(err.Error())
}
// Print out the generated YAML code.
fmt.Println(string(yamlBytes))
// Create the CR object in Kubernetes.
_, err = clientset.ApiextensionsV1().CustomResourceDefinitions().Create(crd)
if err != nil {
panic(err.Error())
}
fmt.Println("Created Custom Resource Definition:", crd.ObjectMeta.Name)
}
该程序会生成一个名为example.com，版本为v1alpha1的CR，并将其创建到Kubernetes集群中。你可以修改crd变量来定义自己的CR。
执行上述程序后，控制台输出将包括生成的YAML代码和创建的CRD的名称。
