client-java

We expect to provide a Java client (Please using JDK 17):

• Flexibility. It can support all Kubernetes-based systems with minimized extra development, such as Openshift, istio, etc.
• Usability. Developers just need to learn to write json/yaml(kubernetes native style) from Kubernetes documentation.
• Integration. It can work with the other Kubernetes clients, such as fabric8, official.

This project is based on the following softwares.

NAME	Website	LICENSE
Apache HttpComponent	https://github.com/apache/httpcomponents-client	Apache License 2.0
Apache Commons-codec	https://github.com/apache/commons-codec	Apache License 2.0
FasterXML Jackson	https://github.com/FasterXML/jackson-databind	Apache License 2.0
Snakeyaml	https://github.com/asomov/snakeyaml	Apache License 2.0

Comparison

	official	fabric8	this project
Compatibility	provide different SDK versions	provide different SDK versions	one version for all
Support customized Kubernetes resources	a lot of development	a lot of development	zero-deployment
Works with the other SDKs	/	/	simple

Supported

• National Key Research and Development Program of China (2023YFB3308702)

Architecture

Installation

To install the Java client library to your local Maven repository, simply execute:

git clone --recursive https://github.com/kubesys/client-java
cd java
mvn install

Maven users

Add this dependency to your project's POM:

<dependency>
  <groupId>io.github.kubesys</groupId>
  <artifactId>client-java</artifactId>
  <version>1.2.3</version> 
</dependency>

1. maven setting

<settings>
    <!-- omitted xml -->
    <servers>
        <server>
            <id>g-ubjg5602-iscas-system-maven</id>
            <username>wuheng@iscas.ac.cn</username>
            <password>[PASSWORD]</password>
        </server>
    </servers>
</settings>

2. pom setting

<profiles>
    <profile>
        <id>Repository Proxy</id>
        <activation>
            <activeByDefault>true</activeByDefault>
        </activation>
        <repositories>
            <repository>
                <id>g-ubjg5602-iscas-system-maven</id>
                <name>maven</name>
                <url>https://g-ubjg5602-maven.pkg.coding.net/repository/iscas-system/jars/</url>
                <releases>
                    <enabled>true</enabled>
                </releases>
                <snapshots>
                    <enabled>true</enabled>
                </snapshots>
            </repository>
        </repositories>
    </profile>
</profiles>

Quick start

• Creating a client
• Get all kinds
• Simple examples
• watch resourcs
• Work with other SDKs

Build from source

docker run -it --net host --rm -v /root/.m2:/root/.m2 -v "$(pwd)":/usr/src/mymaven -w /usr/src/mymaven maven:3.8.5-openjdk-17-slim mvn clean install -Dmaven.test.skip

Creating a client

Two easiest way to create a client is:

CA:

File file = new File("/etc/kubernetes/admin.conf"); // if you installed Kuberentes, this file exist, or using the file $HOME/.kube/config
KubernetesClient client = new KubernetesClient(file);

Bearer token:

String url = "https://IP:6443/";
String token = "xxx";
KubernetesClient client = new KubernetesClient(url, token);

you can create and get a token by the following commands:

1. create token

kubectl create -f https://raw.githubusercontent.com/kubesys/client-java/master/token.yaml

2. get token

kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep iscas-client | awk '{print $1}') | grep "token:" | awk -F":" '{print$2}' | sed 's/ //g'

get-all-kinds

1. get kind

Here, the 'kind' means the Kubernetes kind

System.out.println(client.getKinds().toPrettyString());

for example, the output is

[
	"DaemonSet",
	"Node",
	"Pod",
	"ClusterRole",
	"StorageClass",
	"PriorityClass",
	"ReplicationController",
	"PersistentVolume",
	"ReplicaSet",
	"Job"
]

2. get fullkind

Here, fullkind = apiversion + "." + kind

System.out.println(client.getFullKinds().toPrettyString());

for example, the output is

[
	"apps.DaemonSet",
	"Node",
	"Pod",
	"rbac.authorization.k8s.io.ClusterRole",
	"storage.k8s.io.StorageClass",
	"scheduling.k8s.io.PriorityClass",
	"apps.ReplicaSet",
	"batch.Job"
]

simple-examples

Assume you have a json:

{
  "apiVersion": "v1",
  "kind": "Pod",
  "metadata": {
    "name": "busybox",
    "namespace": "default",
    "labels": {
      "test": "test"
    }
  }
}

List resources:

client.listResources("Pod")       // kind or fullKind

Create a resource:

client.createResource(new ObjectMapper().readTree(json));

Get a resource:

client.getResource("Pod", "default", "busybox");       // kind or fullKind

Delete a resource::

client.deleteResource("Pod", "default", "busybox")     // kind or fullKind

Close client

client.close()

watch-resources

KubernetesWatcher watcher = new KubernetesWatcher(client) {
			
  public void doModified(JsonNode node) {
    System.out.println(node);
  }
  
  public void doDeleted(JsonNode node) {
    System.out.println(node);
  }
  
  public void doAdded(JsonNode node) {
    System.out.println(node);
  }
  
  public void doClose() {
    System.out.println("close");
  }
};

client.watchResources("Pod", KubernetesConstants.VALUE_ALL_NAMESPACES, watcher);

and the output is as

{"kind":"Pod","apiVersion":"v1","metadata":{"name":"kube-nexus3-7b5769ccf7-95p4p","generateName":"kube-nexus3-7b5769ccf7-","namespace":"kube-system","uid":"c55d4976-165a-4a04-bd15-bbb2a42f7fc0","resourceVersion":"101041","creationTimestamp":"2021-08-18T07:06:03Z","labels":{"name":"kube-nexus3","pod-template-hash":"7b5769ccf7"},"annotations":{"cni.projectcalico.org/containerID":"11c985c51253d2aed8f2276d6045be2d66338120f1968b2205ffcd92e808b696","cni.projectcalico.org/podIP":"10.244.158.133/32","cni.projectcalico.org/podIPs":"10.244.158.133/32"},"ownerReferences":[{"apiVersion":"apps/v1","kind":"ReplicaSet","name":"kube-nexus3-7b5769ccf7","uid":"ce20ed7d-c561-4699-994f-9f8556fc33bc","controller":true,"blockOwnerDeletion":true}],"managedFields":[{"manager":"kube-controller-manager","operation":"Update","apiVersion":"v1","time":"2021-08-18T07:06:03Z","fieldsType":"FieldsV1","fieldsV1":{"f:metadata":{"f:generateName":{},"f:labels":{".":{},"f:name":{},"f:pod-template-hash":{}},"f:ownerReferences":{".":{},"k:{\"uid\":\"ce20ed7d-c561-4699-994f-9f8556fc33bc\"}":{".":{},"f:apiVersion":{},"f:blockOwnerDeletion":{},"f:controller":{},"f:kind":{},"f:name":{},"f:uid":{}}}},"f:spec":{"f:containers":{"k:{\"name\":\"kube-nexus3\"}":{".":{},"f:image":{},"f:imagePullPolicy":{},"f:name":{},"f:resources":{},"f:terminationMessagePath":{},"f:terminationMessagePolicy":{},"f:volumeMounts":{".":{},"k:{\"mountPath\":\"/nexus-data\"}":{".":{},"f:mountPath":{},"f:name":{}}}}},"f:dnsPolicy":{},"f:enableServiceLinks":{},"f:nodeSelector":{".":{},"f:node-role.kubernetes.io/master":{}},"f:restartPolicy":{},"f:schedulerName":{},"f:securityContext":{},"f:terminationGracePeriodSeconds":{},"f:tolerations":{},"f:volumes":{".":{},"k:{\"name\":\"data\"}":{".":{},"f:hostPath":{".":{},"f:path":{},"f:type":{}},"f:name":{}}}}}},{"manager":"calico","operation":"Update","apiVersion":"v1","time":"2021-08-18T07:06:04Z","fieldsType":"FieldsV1","fieldsV1":{"f:metadata":{"f:annotations":{".":{},"f:cni.projectcalico.org/containerID":{},"f:cni.projectcalico.org/podIP":{},"f:cni.projectcalico.org/podIPs":{}}}}},{"manager":"kubelet","operation":"Update","apiVersion":"v1","time":"2021-08-18T07:06:21Z","fieldsType":"FieldsV1","fieldsV1":{"f:status":{"f:conditions":{"k:{\"type\":\"ContainersReady\"}":{".":{},"f:lastProbeTime":{},"f:lastTransitionTime":{},"f:status":{},"f:type":{}},"k:{\"type\":\"Initialized\"}":{".":{},"f:lastProbeTime":{},"f:lastTransitionTime":{},"f:status":{},"f:type":{}},"k:{\"type\":\"Ready\"}":{".":{},"f:lastProbeTime":{},"f:lastTransitionTime":{},"f:status":{},"f:type":{}}},"f:containerStatuses":{},"f:hostIP":{},"f:phase":{},"f:podIP":{},"f:podIPs":{".":{},"k:{\"ip\":\"10.244.158.133\"}":{".":{},"f:ip":{}}},"f:startTime":{}}}}]},"spec":{"volumes":[{"name":"data","hostPath":{"path":"/var/lib/doslab/nexus","type":""}},{"name":"default-token-zfqwp","secret":{"secretName":"default-token-zfqwp","defaultMode":420}}],"containers":[{"name":"kube-nexus3","image":"sonatype/nexus3","resources":{},"volumeMounts":[{"name":"data","mountPath":"/nexus-data"},{"name":"default-token-zfqwp","readOnly":true,"mountPath":"/var/run/secrets/kubernetes.io/serviceaccount"}],"terminationMessagePath":"/dev/termination-log","terminationMessagePolicy":"File","imagePullPolicy":"IfNotPresent"}],"restartPolicy":"Always","terminationGracePeriodSeconds":30,"dnsPolicy":"ClusterFirst","nodeSelector":{"node-role.kubernetes.io/master":""},"serviceAccountName":"default","serviceAccount":"default","nodeName":"iz8vb39159pi4b6k0wfz68z","securityContext":{},"schedulerName":"default-scheduler","tolerations":[{"key":"node-role.kubernetes.io/master","effect":"NoSchedule"},{"key":"node.kubernetes.io/not-ready","operator":"Exists","effect":"NoExecute","tolerationSeconds":300},{"key":"node.kubernetes.io/unreachable","operator":"Exists","effect":"NoExecute","tolerationSeconds":300}],"priority":0,"enableServiceLinks":true,"preemptionPolicy":"PreemptLowerPriority"},"status":{"phase":"Running","conditions":[{"type":"Initialized","status":"True","lastProbeTime":null,"lastTransitionTime":"2021-08-18T07:06:04Z"},{"type":"Ready","status":"True","lastProbeTime":null,"lastTransitionTime":"2021-08-18T07:06:21Z"},{"type":"ContainersReady","status":"True","lastProbeTime":null,"lastTransitionTime":"2021-08-18T07:06:21Z"},{"type":"PodScheduled","status":"True","lastProbeTime":null,"lastTransitionTime":"2021-08-18T07:06:04Z"}],"hostIP":"172.23.136.69","podIP":"10.244.158.133","podIPs":[{"ip":"10.244.158.133"}],"startTime":"2021-08-18T07:06:04Z","containerStatuses":[{"name":"kube-nexus3","state":{"running":{"startedAt":"2021-08-18T07:06:20Z"}},"lastState":{"terminated":{"exitCode":0,"reason":"Completed","startedAt":"2021-08-18T07:06:06Z","finishedAt":"2021-08-18T07:06:07Z","containerID":"containerd://88648ca0c629223ba99f4a4109fb348896553f1b287da43073268a949fcee778"}},"ready":true,"restartCount":2,"image":"docker.io/sonatype/nexus3:latest","imageID":"docker.io/sonatype/nexus3@sha256:94d9032990de23a4fbdeae45960a256a6153f130ab39dbe53880849dbbf18e05","containerID":"containerd://34d63461c68892e868ec44b4e854b29109592e5925d3d18adb2d9550f03d394e","started":true}],"qosClass":"BestEffort"}}
{"kind":"Pod","apiVersion":"v1","metadata":{"name":"etcd-iz8vb39159pi4b6k0wfz68z","namespace":"kube-system","uid":"217e6f93-5daa-4986-be9e-d844c3fb6805","resourceVersion":"610","creationTimestamp":"2021-08-17T07:52:52Z","labels":{"component":"etcd","tier":"control-plane"},"annotations":{"kubeadm.kubernetes.io/etcd.advertise-client-urls":"https://172.23.136.69:2379","kubernetes.io/config.hash":"a08b6d0d8f468604b7564b87de8dfd49","kubernetes.io/config.mirror":"a08b6d0d8f468604b7564b87de8dfd49","kubernetes.io/config.seen":"2021-08-17T15:52:46.797594841+08:00","kubernetes.io/config.source":"file"},"ownerReferences":[{"apiVersion":"v1","kind":"Node","name":"iz8vb39159pi4b6k0wfz68z","uid":"c2716d4d-0926-4cac-88fa-5700d5194920","controller":true}],"managedFields":[{"manager":"kubelet","operation":"Update","apiVersion":"v1","time":"2021-08-17T07:53:56Z","fieldsType":"FieldsV1","fieldsV1":{"f:metadata":{"f:annotations":{".":{},"f:kubeadm.kubernetes.io/etcd.advertise-client-urls":{},"f:kubernetes.io/config.hash":{},"f:kubernetes.io/config.mirror":{},"f:kubernetes.io/config.seen":{},"f:kubernetes.io/config.source":{}},"f:labels":{".":{},"f:component":{},"f:tier":{}},"f:ownerReferences":{".":{},"k:{\"uid\":\"c2716d4d-0926-4cac-88fa-5700d5194920\"}":{".":{},"f:apiVersion":{},"f:controller":{},"f:kind":{},"f:name":{},"f:uid":{}}}},"f:spec":{"f:containers":{"k:{\"name\":\"etcd\"}":{".":{},"f:command":{},"f:image":{},"f:imagePullPolicy":{},"f:livenessProbe":{".":{},"f:failureThreshold":{},"f:httpGet":{".":{},"f:host":{},"f:path":{},"f:port":{},"f:scheme":{}},"f:initialDelaySeconds":{},"f:periodSeconds":{},"f:successThreshold":{},"f:timeoutSeconds":{}},"f:name":{},"f:resources":{".":{},"f:requests":{".":{},"f:cpu":{},"f:memory":{}}},"f:startupProbe":{".":{},"f:failureThreshold":{},"f:httpGet":{".":{},"f:host":{},"f:path":{},"f:port":{},"f:scheme":{}},"f:initialDelaySeconds":{},"f:periodSeconds":{},"f:successThreshold":{},"f:timeoutSeconds":{}},"f:terminationMessagePath":{},"f:terminationMessagePolicy":{},"f:volumeMounts":{".":{},"k:{\"mountPath\":\"/etc/kubernetes/pki/etcd\"}":{".":{},"f:mountPath":{},"f:name":{}},"k:{\"mountPath\":\"/var/lib/etcd\"}":{".":{},"f:mountPath":{},"f:name":{}}}}},"f:dnsPolicy":{},"f:enableServiceLinks":{},"f:hostNetwork":{},"f:nodeName":{},"f:priorityClassName":{},"f:restartPolicy":{},"f:schedulerName":{},"f:securityContext":{},"f:terminationGracePeriodSeconds":{},"f:tolerations":{},"f:volumes":{".":{},"k:{\"name\":\"etcd-certs\"}":{".":{},"f:hostPath":{".":{},"f:path":{},"f:type":{}},"f:name":{}},"k:{\"name\":\"etcd-data\"}":{".":{},"f:hostPath":{".":{},"f:path":{},"f:type":{}},"f:name":{}}}},"f:status":{"f:conditions":{".":{},"k:{\"type\":\"ContainersReady\"}":{".":{},"f:lastProbeTime":{},"f:lastTransitionTime":{},"f:status":{},"f:type":{}},"k:{\"type\":\"Initialized\"}":{".":{},"f:lastProbeTime":{},"f:lastTransitionTime":{},"f:status":{},"f:type":{}},"k:{\"type\":\"PodScheduled\"}":{".":{},"f:lastProbeTime":{},"f:lastTransitionTime":{},"f:status":{},"f:type":{}},"k:{\"type\":\"Ready\"}":{".":{},"f:lastProbeTime":{},"f:lastTransitionTime":{},"f:status":{},"f:type":{}}},"f:containerStatuses":{},"f:hostIP":{},"f:phase":{},"f:podIP":{},"f:podIPs":{".":{},"k:{\"ip\":\"172.23.136.69\"}":{".":{},"f:ip":{}}},"f:startTime":{}}}}]},"spec":{"volumes":[{"name":"etcd-certs","hostPath":{"path":"/etc/kubernetes/pki/etcd","type":"DirectoryOrCreate"}},{"name":"etcd-data","hostPath":{"path":"/var/lib/etcd","type":"DirectoryOrCreate"}}],"containers":[{"name":"etcd","image":"registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.4.13-0","command":["etcd","--advertise-client-urls=https://172.23.136.69:2379","--cert-file=/etc/kubernetes/pki/etcd/server.crt","--client-cert-auth=true","--data-dir=/var/lib/etcd","--initial-advertise-peer-urls=https://172.23.136.69:2380","--initial-cluster=iz8vb39159pi4b6k0wfz68z=https://172.23.136.69:2380","--key-file=/etc/kubernetes/pki/etcd/server.key","--listen-client-urls=https://127.0.0.1:2379,https://172.23.136.69:2379","--listen-metrics-urls=http://127.0.0.1:2381","--listen-peer-urls=https://172.23.136.69:2380","--name=iz8vb39159pi4b6k0wfz68z","--peer-cert-file=/etc/kubernetes/pki/etcd/peer.crt","--peer-client-cert-auth=true","--peer-key-file=/etc/kubernetes/pki/etcd/peer.key","--peer-trusted-ca-file=/etc/kubernetes/pki/etcd/ca.crt","--snapshot-count=10000","--trusted-ca-file=/etc/kubernetes/pki/etcd/ca.crt"],"resources":{"requests":{"cpu":"100m","memory":"100Mi"}},"volumeMounts":[{"name":"etcd-data","mountPath":"/var/lib/etcd"},{"name":"etcd-certs","mountPath":"/etc/kubernetes/pki/etcd"}],"livenessProbe":{"httpGet":{"path":"/health","port":2381,"host":"127.0.0.1","scheme":"HTTP"},"initialDelaySeconds":10,"timeoutSeconds":15,"periodSeconds":10,"successThreshold":1,"failureThreshold":8},"startupProbe":{"httpGet":{"path":"/health","port":2381,"host":"127.0.0.1","scheme":"HTTP"},"initialDelaySeconds":10,"timeoutSeconds":15,"periodSeconds":10,"successThreshold":1,"failureThresh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work-with-other-sdks

Unlike fabric8, you need to implement 'create, update, delete, list, get, watch' operators for customized Kubernetes resources.

This SDK peovides a unified API using JSON, and can automatically support customized Kubernetes resources.

In addition, if you want to get object (not JSON), you just need to write a JavaBean or reused a JavaBean from an existing SDKs.

Let take fabric8 for example.

JsonNode json = client.getResource("Pod", "default", "busybox");
io.fabric8.kubernetes.api.model.Pod pod = new ObjectMapper().readValue(json.toString(), io.fabric8.kubernetes.api.model.Pod.class);

Roadmap

• 1.2.x: support webhook
• 1.3.x: example doc generation

Sonatype

Other

• kubectl command
• webhook
  • example
  • cert