README.md · syswu/kubernetes-client

# 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](https://www.redhat.com/en/technologies/cloud-computing/openshift), [istio](https://istio.io/), etc.
- **Usability**. Developers just need to learn to write json/yaml(kubernetes native style) from [Kubernetes documentation](https://kubernetes.io/docs/home/).
- **Integration**. It can work with the other Kubernetes clients, such as [fabric8](https://github.com/fabric8io/kubernetes-client), [official](https://github.com/kubernetes-client/java/).

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](https://github.com/kubernetes-client/java/) | [fabric8](https://github.com/fabric8io/kubernetes-client) | [this project](https://github.com/kubesys/kubernetes-client)  | 
|---------------------------|------------------|------------------|-------------------|
|        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

![avatar](/docs/arch.png)
 
## Installation

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

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

### Maven users

Add this dependency to your project's POM:

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

1. maven setting

```
<settings>
    
    <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](#creating-a-client)
- [Get all kinds](#get-all-kinds)
- [Simple examples](#simple-examples)
- [watch resourcs](#watch-resources)
- [Work with other SDKs](#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: 
```java
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:

```java
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

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

```kubectl
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](https://kubernetes.io/docs/concepts/overview/working-with-objects/kubernetes-objects/)

```java
System.out.println(client.getKinds().toPrettyString());
```
for example, the output is 
```json
[
	"DaemonSet",
	"Node",
	"Pod",
	"ClusterRole",
	"StorageClass",
	"PriorityClass",
	"ReplicationController",
	"PersistentVolume",
	"ReplicaSet",
	"Job"
]
```

2. get fullkind

Here, fullkind = [apiversion](https://kubernetes.io/docs/concepts/overview/working-with-objects/kubernetes-objects/) + "." + [kind](https://kubernetes.io/docs/concepts/overview/working-with-objects/kubernetes-objects/)

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

for example, the output is

```json
[
	"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:

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

List resources:

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

Create a resource:

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

Get a resource:

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

Delete a resource::

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

Close client

```java
client.close()
```

### watch-resources

```java
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@sha256:94d9032990de23a4fbdeae45960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{"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](https://github.com/fabric8io/kubernetes-client), 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.

```java
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](https://mp.weixin.qq.com/s?__biz=Mzg2MDYzODI5Nw==&mid=2247493958&idx=1&sn=d7e47334823f58db7ce012783045f382&source=41#wechat_redirect)

## Other
- [kubectl command](https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands)
- [webhook](https://medium.com/ovni/writing-a-very-basic-kubernetes-mutating-admission-webhook-398dbbcb63ec)
  - [example](https://github.com/alex-leonhardt/k8s-mutate-webhook/blob/master/deploy/webhook.yaml)
  - [cert](https://github.com/alex-leonhardt/k8s-mutate-webhook/blob/master/ssl/ssl.sh)

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