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This article introduces how java implements kubernates's api access to Fabric8. The content is very detailed. Interested friends can use it for reference. I hope it will be helpful to you.

I. Preface

There are many ways for java to access kubernates API, and there are two ways to develop it in Java, one is based on Jersey, the other is based on Fabric8. Because Kubernates API Server is RESRFul Web Service, and Jersey is a framework that facilitates and simplifies the development of RESRFul Web Service, it is easier to adopt jersey, but it still requires a lot of work for developers themselves. Kubernates-client-1.3.83.jar,kubernates-model-1.0.12.jar and other toolkits in Fabric8 encapsulate kubernates api very well, and the access code is relatively simple.

II. Instructions for use

Prepare the relevant jar packages

Create a client that accesses API Server

See three for the code

Manipulate the resources of kubernates

Commonly used resources (resource explanations will be added later):

Nodes

Namespaces

Services

Replicationcontrollers

Pods

Events

Resourcequotas

You can add, delete, modify and check the above resources through api.

Third, the specific code implementation

1. Create a client code example that accesses k8s API server

Config config = new ConfigBuilder () .withMasterUrl ("http://10.45.32.153:8080/").build();

KubernetesClient client = new DefaultKubernetesClient (config)

/ / http://10.45.32.153:8080/ is the address of API Server

two。 Code example for querying k8s resources (each resource is queried in more or less the same way)

Almost all resources can be checked, now let's take query namesapce as an example to explain.

A query all namespace lists

List nameSpaceList = client.namespaces (). List (). GetItems ()

B query namespace based on condition

Namespace space = client.namespaces () .withName (tenant.getAccount ()) .get ()

It can be filtered according to many conditions.

3. Create resource sample code (this is the core part, each resource is created differently)

A create tenant

Namespace ns = new NamespaceBuilder () .withNewMetadata ()

.withName (tenant.getAccount ()) .endMetadata () .build ()

/ / property setting

ObjectMeta metadata = new ObjectMeta ()

Map labels = new HashMap ()

Labels.put ("label1", tenant.getAccount ())

Metadata.setLabels (labels)

Metadata.setNamespace (tenant.getAccount ())

Metadata.setName (tenant.getAccount ())

Ns.setMetadata (metadata)

/ / perform the create operation

Client.namespaces () create (ns)

B create result

Note: this code does not set quotas for namespace

4. Modify tenant quota sample code

5. Delete tenant sample code

Client.namespaces () .withName (tenant.getAccount ()) .delete ()

About java how to achieve kubernates api access Fabric8 to share here, I hope the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.

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