I'm trying to write code in Go to fetch the labels of the pods created in a deployment. For example:
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
labels:
app: nginx
spec:
replicas: 3
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.14.2
ports:
- containerPort: 80I know if I use ObjectMeta, I would be able to fetch the metadata of the deployment, but I would not be able to fetch the spec. Is there a way to get the data from the spec level of the resource?
Using kubernetes client-go and this example I was able to get the labels for each container
package main
import (
"context"
"flag"
"fmt"
"log"
"path/filepath"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/util/homedir"
)
func main() {
var kubeconfig *string
if home := homedir.HomeDir(); home != "" {
kubeconfig = flag.String("kubeconfig", filepath.Join(home, ".kube", "config"), "(optional) absolute path to the kubeconfig file")
} else {
kubeconfig = flag.String("kubeconfig", "", "absolute path to the kubeconfig file")
}
flag.Parse()
// use the current context in kubeconfig
config, err := clientcmd.BuildConfigFromFlags("", *kubeconfig)
if err != nil {
log.Fatalf(err.Error())
}
// create the clientset
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
log.Fatalf(err.Error())
}
// get pods
pods, err := clientset.CoreV1().Pods("your-namespace").List(context.TODO(), metav1.ListOptions{})
if err != nil {
log.Fatalf(err.Error())
}
// get labels
for _, pod := range pods.Items {
labels := pod.GetObjectMeta().GetLabels()
fmt.Printf("%+v", labels)
}
}