[Umbrella Issue] Implements equivalences for kubectl commands

[yue9944882]

Basic commands

• kubectl exec: though we already have helper class Exec, a kubectl wrapper can be more user-friendly
• kubectl logs: <ditto>
• kubectl port-forward: <ditto>
• kubectl cp: <ditto>
• kubectl scale: How to use patchNamespacedDeploymentScale? #968
• kubectl rollout: can I use " kubectl rollout history deployment <deployment> " with java API ? #599
• kubectl annotate
• kubectl create Equivalent for kubectl create #1187

Cluster/Node management

• kubectl taint: Patch node with taints using add is overriding already added taints #517
• kubectl drain: How to use kubernetes-client/java implement the command of kubectl drain #1069
• kubectl cordon/uncordon: ApiException exception on CoreV1Api.replaceNode #306
• kubectl top: how to get metrics by client api ? #892

Advanced commands

• kubectl patch: we have PatchUtils documented on README, however a Kubectl.patch(..) be easier for developers to find..
• Kubectl label equivalence #1078 kubectl label/annotate: obviously a common usecase
• kubectl version: TBD
• kubectl api-resources: cluster api discovery is necessary for some usecases

[sarveshkaushal]

Thanks for providing the list. I am confused on where to implement these. I generated code using code-gen repo. But don't see new changes. Some pointers to existing implementation for reference will help.

[brendandburns]

@sarveshkaushal the hand-written code for most of these are located here:

https://github.com/kubernetes-client/java/tree/master/util/src/main/java/io/kubernetes/client

You can add new hand-written utility classes (e.g. Drain.java) there.

[brendandburns]

(and thanks!)

[sarveshkaushal]

@sarveshkaushal the hand-written code for most of these are located here:

https://github.com/kubernetes-client/java/tree/master/util/src/main/java/io/kubernetes/client

You can add new hand-written utility classes (e.g. Drain.java) there.

Thanks I will take a look at it.

[FlyAIBox]

Drain.java

Where is Drain.java ? Is Implements equivalences for kubectl drain

[sarveshkaushal]

You can create it.

[sarveshkaushal]

@brendandburns @yue9944882 I have implemented a utility class. But want to make sure this is acceptable:

public class VersionUtil {
  private ApiClient apiClient;
  private VersionApi versionApi;

  public VersionUtil() {
    this(Configuration.getDefaultApiClient());
  }

  public VersionUtil(ApiClient apiClient) {
    this.apiClient = apiClient;
    this.versionApi = new VersionApi();
  }

  public ApiClient getApiClient() {
    return apiClient;
  }

  public VersionInfo getVersion() throws ApiException {
    return versionApi.getCode();
  }
}

[yue9944882]

i started kubectl label in #1078 as this subcommand is a low-hanging fruit. we will be accepting more subcommands after we agreed on the structure/framework.

[brendandburns]

@sarveshkaushal for version you need to make a call to the server in order to get the version that the server is running. I don't see your code making that network API call.

[brendandburns]

@yue9944882 I'm going to start working on kubectl scale

https://github.com/kubernetes/kubernetes/blob/master/staging/src/k8s.io/kubectl/pkg/cmd/scale/scale.go

[brendandburns]

@yue9944882 I'm going to start working on kubectl exec

[brendandburns]

I'm going to start working on kubectl logs