kubernetes - 如何使用 kubernetes java 客户端获取所有 Kubernetes Deployment 对象？

Question

我打算使用 kubernetes java 客户端 ( https://github.com/kubernetes-client/java/ ) 编写简单的程序。我可以获取所有命名空间和 Pod，但如何获取给定命名空间中的部署列表？我找不到任何方法。有什么办法可以得到吗？

for (V1Namespace ns: namespaces.getItems()) {
  System.out.println("------Begin-----");
  System.out.println("Namespace: " + ns.getMetadata().getName());

  V1PodList pods = api.listNamespacedPod(ns.getMetadata().getName(), null, null, null, null, null, null, null, null, null);
  int count = 0;
  for (V1Pod pod: pods.getItems()) {
    System.out.println("Pod " + (++count) + ": " + pod.getMetadata().getName());
    System.out.println("Node: " + pod.getSpec().getNodeName());

  }
  System.out.println("------ENd-----");
}

Answer 1

我猜您正在寻找以下 example :

public class Example {
  public static void main(String[] args) {
    ApiClient defaultClient = Configuration.getDefaultApiClient();
    defaultClient.setBasePath("http://localhost");
    
    // Configure API key authorization: BearerToken
    ApiKeyAuth BearerToken = (ApiKeyAuth) defaultClient.getAuthentication("BearerToken");
    BearerToken.setApiKey("YOUR API KEY");
    // Uncomment the following line to set a prefix for the API key, e.g. "Token" (defaults to null)
    //BearerToken.setApiKeyPrefix("Token");

    AppsV1Api apiInstance = new AppsV1Api(defaultClient);
    String namespace = "namespace_example"; // String | object name and auth scope, such as for teams and projects
    String pretty = "pretty_example"; // String | If 'true', then the output is pretty printed.
    Boolean allowWatchBookmarks = true; // Boolean | allowWatchBookmarks requests watch events with type \"BOOKMARK\". Servers that do not implement bookmarks may ignore this flag and bookmarks are sent at the server's discretion. Clients should not assume bookmarks are returned at any specific interval, nor may they assume the server will send any BOOKMARK event during a session. If this is not a watch, this field is ignored. If the feature gate WatchBookmarks is not enabled in apiserver, this field is ignored.
    String _continue = "_continue_example"; // String | The continue option should be set when retrieving more results from the server. Since this value is server defined, clients may only use the continue value from a previous query result with identical query parameters (except for the value of continue) and the server may reject a continue value it does not recognize. If the specified continue value is no longer valid whether due to expiration (generally five to fifteen minutes) or a configuration change on the server, the server will respond with a 410 ResourceExpired error together with a continue token. If the client needs a consistent list, it must restart their list without the continue field. Otherwise, the client may send another list request with the token received with the 410 error, the server will respond with a list starting from the next key, but from the latest snapshot, which is inconsistent from the previous list results - objects that are created, modified, or deleted after the first list request will be included in the response, as long as their keys are after the \"next key\".  This field is not supported when watch is true. Clients may start a watch from the last resourceVersion value returned by the server and not miss any modifications.
    String fieldSelector = "fieldSelector_example"; // String | A selector to restrict the list of returned objects by their fields. Defaults to everything.
    String labelSelector = "labelSelector_example"; // String | A selector to restrict the list of returned objects by their labels. Defaults to everything.
    Integer limit = 56; // Integer | limit is a maximum number of responses to return for a list call. If more items exist, the server will set the `continue` field on the list metadata to a value that can be used with the same initial query to retrieve the next set of results. Setting a limit may return fewer than the requested amount of items (up to zero items) in the event all requested objects are filtered out and clients should only use the presence of the continue field to determine whether more results are available. Servers may choose not to support the limit argument and will return all of the available results. If limit is specified and the continue field is empty, clients may assume that no more results are available. This field is not supported if watch is true.  The server guarantees that the objects returned when using continue will be identical to issuing a single list call without a limit - that is, no objects created, modified, or deleted after the first request is issued will be included in any subsequent continued requests. This is sometimes referred to as a consistent snapshot, and ensures that a client that is using limit to receive smaller chunks of a very large result can ensure they see all possible objects. If objects are updated during a chunked list the version of the object that was present at the time the first list result was calculated is returned.
    String resourceVersion = "resourceVersion_example"; // String | When specified with a watch call, shows changes that occur after that particular version of a resource. Defaults to changes from the beginning of history. When specified for list: - if unset, then the result is returned from remote storage based on quorum-read flag; - if it's 0, then we simply return what we currently have in cache, no guarantee; - if set to non zero, then the result is at least as fresh as given rv.
    Integer timeoutSeconds = 56; // Integer | Timeout for the list/watch call. This limits the duration of the call, regardless of any activity or inactivity.
    Boolean watch = true; // Boolean | Watch for changes to the described resources and return them as a stream of add, update, and remove notifications. Specify resourceVersion.
    try {
      V1DeploymentList result = apiInstance.listNamespacedDeployment(namespace, pretty, allowWatchBookmarks, _continue, fieldSelector, labelSelector, limit, resourceVersion, timeoutSeconds, watch);
      System.out.println(result);
    } catch (ApiException e) {
      System.err.println("Exception when calling AppsV1Api#listNamespacedDeployment");
      System.err.println("Status code: " + e.getCode());
      System.err.println("Reason: " + e.getResponseBody());
      System.err.println("Response headers: " + e.getResponseHeaders());
      e.printStackTrace();
    }
  }
}