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#Em client operations errors update#
#Em client operations errors code#

The open API specification of K8S, API services generated by java client based on this specification, and detailed interface documents are in hand, which can be coded for actual combat The address is:, as shown in the red box below: For detailed usage, please refer to K8S official document.

The listNamespacedPod interface in the above figure has two important parameters: fieldSelector and labelSelector, which are used for filtering. The detailed information of the interface can be found in the document with the complete demo code, as shown in the following figure: At this time, select the OpenAPI interface to enter the detailed business parameters.

However, the existing API of ProtoClient does not support submitting more detailed business parameters.

#Em client operations errors code#

If you download the java client source code, you can see the complete OpenAPI interface document in the client java API subprojectĪbove Kubernetes official java client 5: basic operation of proto We have tried to get the pod list in the code of. Open common corev1 Api.java As shown in the red box below, the comments at the top have explained everything: the code is generated by the tool (how to generate it will not be discussed in this article)

In other words, depending on the API in red box 2 and the data structure in red box 3, we can complete most operations related to K8S resource control Red box 1 is a sub project related to OpenAPI, and the functional classes providing services are all in the package of red box 2. Open the source code of java client project as shown in the figure below. Next, go back to the java client to see what OpenAPI related capabilities it provides The above is an introduction to K8S OpenAPI. For example, the API information for querying the pod list is very detailed: The content obtained is shown in the following figure. The original data in the above figure is not readable, so it is copied to the online JSON format website.

#Em client operations errors update#

The system will automatically update according to the changes of the file (never execute kubectl apply -f kube-apiserver.yaml This will cause the new pod of API server to fail to start due to port occupation) Īssuming that the IP address of the host is 192.168.50.135, then access:, all OpenAPI information can be obtained, as shown in the following figure: Please wait a moment after the modification. If you want to see the OpenAPI specification for the current K8S environment, open / etc / kubernetes / manifests / Kube of K8S environment- apiserver.yaml File, add the content in the red box below: It can be seen that K8S provides OpenAPI specification: The address is: Key information is shown in the figure below. Leaving aside the java client, let's take a look at the OpenAPI of K8S. In this chapter, let's learn about OpenAPI related operations

In addition to using ProtoClient to add, delete, modify and query K8S resources, it also provides a more powerful way: OpenAPI.

The Java classes involved in the input parameters and return objects used in these interfaces are generated through the protobuf of K8S The first is proto, which mainly uses the add, delete, modify and query interface provided by ProtoClient class.

Above Kubernetes official java client 5: basic operation of proto As mentioned, the basic functions of java client are composed of two main contexts.

All the Java clients mentioned below refer to clients- jar.jar

This article is the sixth part of the Kubernetes official java client series.

Content: classification and summary of all original articles and supporting source code, involving Java, Docker, Kubernetes, DevOPS, etc overview