List deployments using apimachinery by the .spec.selector.matchLabels key

Question

I want to list my deployments based on a key value pair found in the .spec.selector.matchLabels field.

Doing so using the plain labels is easy, but I could not find a way to match / fetch the deployment that satisfies the condition that a certain key=value is present in the following section

spec:
  [...]
  selector:
    matchLabels:
      app: myapp
      process: web
      release: myrelease

Does not seem this can be done using the ListOptions

Which version of Kubernetes did you use and how did you set up the cluster? Did you use bare metal installation or some cloud provider? — kkopczak, Nov 10 '21 at 15:10
Did you try [`LIST and WATCH filtering`](https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#list-and-watch-filtering)? — kkopczak, Nov 19 '21 at 14:39

score 4 · Accepted Answer · answered Nov 22 '21 at 08:02

It is not supported:

You have to filter on the client side:

    depl, err := clientset.AppsV1().Deployments("some_namespace").List(context.Background(), metav1.ListOptions{})
    if err != nil {
        panic(err.Error())
    }
    for _, item := range depl.Items {
        if item.Spec.Selector.MatchLabels["app"] == "myapp" {
            fmt.Println("found it")
        }
    }

List deployments using apimachinery by the .spec.selector.matchLabels key

1 Answers1