使用 Java 操作 Kubernetes API

其他 2020-01-14 15:34:35 阅读次数: 0

目录

本文目标

k8s-client-java选型

kubernetes-client/java和fabric8io/kubernetes-client对比

kubernetes-client/java的使用

REST API

kubectl api-versions

REST API 实例:     

API Object 整体划分图 (红星符号代表常用资源)

kubernetes-client/java客户端API接口识别

ApiClient初始化&认证

CRD资源增删改查

操作示例

Namespaces增删改查

Node增删改查

Pod增删改查

优先级

Services增删改查

操作示例

Deployment增删改查

kubernetes-client/java 使用注意（很重要）：

本文目标

基于官方kubernetes-client/java类库，实现通过java完成对kubenetes原生资源对象（pod、node、namespace、servcie、deployment）和自定义资源对象（如：cluster）的增删改查或事件监听（watch）

k8s-client-java选型

目前通过java操作k8s，开源版本共有两个：

kubernetes-client/java和fabric8io/kubernetes-client对比

         和官网API一致性   社区活跃度                                          代码生成
kubernetes-client/java 根据k8s-openapi随之更新，一致性和更新频率高 目前不活跃 kubernetes-client/java提供了生成代码的通用跨语言工具，该工具托管在 kubernetes-client / gen存储库中
fabric8io/kubernetes-client 一致性低，更新慢；其中不支持k8s1.8和1.13 社区活跃，目前使用者多 暂无

鉴于kubernetes-client/java和官网API一致性好，本文决定采用它

kubernetes-client/java的使用

REST API

API 资源使用REST模式。

kube-apiserver 支持同时提供 https（默认监听在 6443 端口）和 http API（默认监听在 127.0.0.1 的 8080 端口），其中 http API 是非安全接口，不做任何认证授权机制，不建议生产环境启用。两个接口提供的 REST API 格式相同

图片来自  OpenShift Blog

  1. GET /<资源名的复数格式>：获得某一类型的资源列表，例如GET /pods 返回一个Pod资源列表。

  2. POST /<资源名的复数格式>：创建一个资源，该资源来自用户提供的JSON对象。

  3. GET /<资源名复数格式>/<名字>：通过给出的名称（Name）获得单个资源，例如GET /pods/first 返回一个名称为“first”的Pod。

  4. DELETE /<资源名复数格式>/<名字>：通过给出的名字删除单个资源，删除选项（DeleteOptions）中可以指定的优雅删除（Grace Deletion）的时间（GracePeriodSeconds），该可选项表明了从服务端接收到删除请求到资源被删除的时间间隔（单位为秒）。

  5. PUT /<资源名复数格式>/<名字>：通过给出的资源名和客户端提供的JSON对象来更新或创建资源。

  6. PATCH /<资源名复数格式>/<名字>：选择修改资源详细指定的域。

  7. GET /watch/<资源名复数格式>：随时间变化，不断接收一连串的JSON对象，这些JSON对象记录了给定资源类别内所有资源对象的变化情况。

  8. GET /watch/<资源名复数格式>/：随时间变化，不断接收一连串的JSON对象，这些JSON对象记录了某个给定资源对象的变化情况。

kubectl api-versions

查看 apiserver暴露的接口

kubectl api-versions

或者

curl -H'Authorization: Bearer token' https://192.168.1.122:6443/apis --insecure

[root@fly]# kubectl api-versions
admissionregistration.k8s.io/v1beta1
apiextensions.k8s.io/v1beta1
apiregistration.k8s.io/v1beta1
apps/v1
apps/v1beta1
apps/v1beta2
authentication.istio.io/v1alpha1
authentication.k8s.io/v1
authentication.k8s.io/v1beta1
authorization.k8s.io/v1
authorization.k8s.io/v1beta1
autoscaling/v1
autoscaling/v2beta1
batch/v1
batch/v1beta1
certificates.k8s.io/v1beta1
config.istio.io/v1alpha2
events.k8s.io/v1beta1
extensions/v1beta1
networking.istio.io/v1alpha3
networking.k8s.io/v1
policy/v1beta1
rbac.authorization.k8s.io/v1
rbac.authorization.k8s.io/v1beta1
rbac.istio.io/v1alpha1
storage.k8s.io/v1
storage.k8s.io/v1beta1
v1

REST API 实例:     

  https://10.10.124.199:6443/apis/apps/v1/deployment

  1. https  ： kube-apiserver 支持同时提供https（默认监听在 6443 端口）和 http API（默认监听在 127.0.0.1 的 8080 端口），由于http api 是不会经过认证授权的，在生产环境中，为了安全性考虑，推荐是不启用。
  2. 10.10.124.199  ： 该ip地址为kubernetes master 地址，在集群为高可用设置的场景下，该ip地址为 vip 地址。
  3. apis ：kubernetes在这一层级只有api 与 apis ，api只有初步核心资源，包含pod，node，namespace等基本资源
  4. apps ： 为api group 名，api group 是kubernetes 对资源类型特性相近的整合。
  5. v1： 是作为api group  version， 在新资源类型的加入到kubernetes，会经历版本变迁： v1alpha1-->v1alpha2-->....-->v1alphaN-->v1beta1-->v1beta2-->v1 。
  6. deployment ： 是kubernetes 的资源名

API Object 整体划分图 (红星符号代表常用资源)

kubernetes-client/java客户端API接口识别

打开kubernetes-client/java，只要是以Api结尾，一般就是我们可以调用的Api接口

API接口识别

ApiClient初始化&认证

ApiClient client = new ClientBuilder().setBasePath("ApiServer地址").setVerifyingSsl(false)
                .setAuthentication(new AccessTokenAuthentication("Token")).build();
        Configuration.setDefaultApiClient(client);

在生产环境，建议放在 程序启动前的初始化方法中

CRD资源增删改查

使用 CustomObjectsApi apiInstance = new CustomObjectsApi(); 操作

Method HTTP request Description
createClusterCustomObject POST /apis/{group}/{version}/{plural} 创建集群范围CRD资源对象
createNamespacedCustomObject POST /apis/{group}/{version}/namespaces/{namespace}/{plural} 创建分区范围CRD资源对象
deleteClusterCustomObject DELETE /apis/{group}/{version}/{plural}/{name} 删除集群范围CRD资源对象
deleteNamespacedCustomObject DELETE/apis/{group}/{version}/namespaces/{namespace}/{plural}/{name} 删除分区范围CRD资源对象
getClusterCustomObject GET /apis/{group}/{version}/{plural}/{name} 获取集群范围CRD资源对象
getClusterCustomObjectScale GET /apis/{group}/{version}/{plural}/{name}/scale 获取集群范围CRD资源对象-scale
getClusterCustomObjectStatus GET /apis/{group}/{version}/{plural}/{name}/status 获取集群范围CRD资源对象-状态
getNamespacedCustomObject GET /apis/{group}/{version}/namespaces/{namespace}/{plural}/{name} 获取分区范围CRD资源对象
getNamespacedCustomObjectScale GET/apis/{group}/{version}/namespaces/{namespace}/{plural}/{name}/scale 获取分区范围CRD资源对象-scale
getNamespacedCustomObjectStatus GET/apis/{group}/{version}/namespaces/{namespace}/{plural}/{name}/status 获取分区范围CRD资源对象-状态
listClusterCustomObject GET /apis/{group}/{version}/{plural} 集群范围CRD资源对象列表
listNamespacedCustomObject GET /apis/{group}/{version}/namespaces/{namespace}/{plural} 分区范围CRD资源对象列表
patchClusterCustomObject PATCH /apis/{group}/{version}/{plural}/{name} 更新集群范围CRD资源对象
patchClusterCustomObjectScale PATCH /apis/{group}/{version}/{plural}/{name}/scale 更新集群范围CRD资源对象-scale
patchClusterCustomObjectStatus PATCH /apis/{group}/{version}/{plural}/{name}/status 更新集群范围CRD资源对象-状态
patchNamespacedCustomObject PATCH/apis/{group}/{version}/namespaces/{namespace}/{plural}/{name} 更新分区范围CRD资源对象
patchNamespacedCustomObjectScale PATCH/apis/{group}/{version}/namespaces/{namespace}/{plural}/{name}/scale 更新分区范围CRD资源对象-scale
patchNamespacedCustomObjectStatus PATCH/apis/{group}/{version}/namespaces/{namespace}/{plural}/{name}/status 更新分区范围CRD资源对象-状态
replaceClusterCustomObject PUT /apis/{group}/{version}/{plural}/{name} 替换集群范围CRD资源对象
replaceClusterCustomObjectScale PUT /apis/{group}/{version}/{plural}/{name}/scale 替换集群范围CRD资源对象-scale
replaceClusterCustomObjectStatus PUT /apis/{group}/{version}/{plural}/{name}/status 替换集群范围CRD资源对象-状态
replaceNamespacedCustomObject PUT /apis/{group}/{version}/namespaces/{namespace}/{plural}/{name} 替换分区范围CRD资源对象
replaceNamespacedCustomObjectScale PUT/apis/{group}/{version}/namespaces/{namespace}/{plural}/{name}/scale 替换分区范围CRD资源对象-scale
replaceNamespacedCustomObjectStatus PUT/apis/{group}/{version}/namespaces/{namespace}/{plural}/{name}/status 替换分区范围CRD资源对象-状态

操作示例

简要描述：

请求方式：

  • GET

请求URL：

  • /apis/{group}/{version}/{plural}

请求URL示例：

  • /apis/flycloud.cn/v1/clusters

请求java示例：

        CustomObjectsApi apiInstance = new CustomObjectsApi();
        String group = "flycloud.cn"; 
        String version = "v1";
        String plural = "clusters";
        String pretty = "ture";
        try {
            Object result = apiInstance.listClusterCustomObject(group,version,plural,pretty,null,null,null,null);
            String listCluster = JSON.toJSONString(result);
            System.out.println(listCluster);
        } catch (ApiException e) {
            System.err.println("Exception when calling CustomObjectsApi#listClusterCustomObject");
            e.printStackTrace();
        }

返回结果：

 {
	"apiVersion": "flycloud.cn/v1",
	"items": [{
		"apiVersion": "flycloud.cn/v1",
		"kind": "Cluster",
		"metadata": {
			"annotations": {
				"name": "top"
			},
			"creationTimestamp": "2019-08-12T07:03:23Z",
			"generation": 1.0,
			"labels": {
				"template": "platform"
			},
			"name": "top",
			"namespace": "cluster-top",
			"resourceVersion": "277020",
			"selfLink": "/apis/flycloud.cn/v1/namespaces/cluster-top/clusters/top",
			"uid": "46528941-bccf-11e9-bfeb-005056bc7cff"
		},
		"spec": {
			"info": {
				"address": "192.168.103.60",
				"harbor": {
					"address": "192.168.103.65",
					"password": "123456",
					"port": 443.0,
					"protocol": "https",
					"user": "admin"
				},
				"jenkins": {
					"password": "admin",
					"type": "jenkins",
					"username": "admin"
				},
				"mysql": {
					"connectionProperties": "druid.stat.mergeSql=true druid.stat.slowSqlMillis=5000",
					"driverClass": "com.mysql.jdbc.Driver",
					"filters": "stat",
					"initialSize": 0.0,
					"logAbandoned": true,
					"maxActive": 100.0,
					"maxOpenPreparedStatements": 50.0,
					"maxWait": 60000.0,
					"minIdle": 0.0,
					"minPoolSize": 2.0,
					"password": "123456",
					"poolPreparedStatements": false,
					"removeAbandoned": true,
					"removeAbandonedTimeout": 900.0,
					"type": "api-mysql",
					"username": "root"
				},
				"network": {
					"networkFlag": "calico",
					"version": 1.0
				},
				"nfs": [{
					"capacity": "1",
					"ip": "192.168.103.65",
					"name": "nfs",
					"path": "/nfs/top",
					"type": "nfs"
				}],
				"port": 6443.0,
				"prometheusPort": 30003.0,
				"protocol": "https",
				"redis": {
					"maxTotal": 500.0,
					"maxWaitMillis": 15000.0,
					"minIdle": 10.0,
					"password": "123456",
					"testOnBorrow": true,
					"testWhileIdle": true,
					"timeBetweenEvictionRunsMillis": 600000.0,
					"type": "api-redis"
				}
			},
			"template": [{
				"namespace": "kube-system",
				"serviceName": "heapster",
				"servicePort": [{
					"port": 80.0,
					"protocol": "TCP",
					"type": "check"
				}],
				"type": "heapster"
			}, {
				"namespace": "kube-system",
				"serviceName": "influxdb",
				"servicePort": [{
					"port": 80.0,
					"protocol": "TCP",
					"type": "web"
				}, {
					"port": 8086.0,
					"protocol": "TCP",
					"type": "api"
				}],
				"type": "influxdb"
			}, {
				"namespace": "kube-system",
				"serviceName": "elasticsearch-logging-v1",
				"servicePort": [{
					"port": 9200.0,
					"protocol": "TCP",
					"type": "web"
				}, {
					"port": 9300.0,
					"protocol": "TCP",
					"type": "api"
				}],
				"type": "es"
			}, {
				"namespace": "kube-system",
				"serviceName": "oam-api-service",
				"servicePort": [{
					"port": 8081.0,
					"protocol": "TCP",
					"type": "api"
				}],
				"type": "oam-api"
			}, {
				"namespace": "kube-system",
				"serviceName": "oam-task-service",
				"type": "oma-task"
			}, {
				"namespace": "kube-system",
				"serviceName": "webapi-service",
				"servicePort": [{
					"port": 8080.0,
					"protocol": "TCP",
					"type": "api"
				}],
				"type": "webapi"
			}, {
				"namespace": "kube-system",
				"serviceName": "webpage-service",
				"servicePort": [{
					"port": 8887.0,
					"protocol": "TCP",
					"type": "web"
				}],
				"type": "webpage"
			}, {
				"namespace": "kube-system",
				"serviceName": "terminal-service",
				"servicePort": [{
					"port": 8888.0,
					"protocol": "TCP",
					"type": "api"
				}],
				"type": "terminal"
			}, {
				"namespace": "kube-system",
				"serviceName": "api-mysql-service",
				"servicePort": [{
					"nodePort": 30306.0,
					"port": 3306.0,
					"protocol": "TCP",
					"type": "api"
				}],
				"type": "api-mysql"
			}, {
				"namespace": "kube-system",
				"serviceName": "api-redis-service",
				"servicePort": [{
					"nodePort": 30379.0,
					"port": 6379.0,
					"protocol": "TCP",
					"type": "api"
				}],
				"type": "api-redis"
			}, {
				"namespace": "kube-system",
				"serviceName": "jenkins",
				"servicePort": [{
					"nodePort": 30080.0,
					"port": 8080.0,
					"protocol": "TCP",
					"type": "api"
				}],
				"type": "jenkins"
			}, {
				"namespace": "kube-system",
				"serviceName": "nfs-controller",
				"type": "nfs-controller"
			}, {
				"namespace": "kube-system",
				"serviceName": "auto-scale",
				"type": "auto-scale"
			}, {
				"namespace": "kube-system",
				"serviceName": "node-up-down",
				"type": "node-up-down"
			}, {
				"namespace": "kube-system",
				"serviceName": "calico-node",
				"type": "calico-node"
			}, {
				"namespace": "kube-system",
				"serviceName": "calico-kube-controller",
				"type": "calico-cotnroller"
			}, {
				"namespace": "kube-system",
				"serviceName": "kube-apiserver",
				"type": "kube-apiserver"
			}, {
				"namespace": "kube-system",
				"serviceName": "kube-controller-manager",
				"type": "kube-controller-manager"
			}, {
				"namespace": "kube-system",
				"serviceName": "kube-scheduler",
				"type": "kube-scheduler"
			}, {
				"namespace": "kube-system",
				"serviceName": "kube-proxy",
				"type": "kube-proxy"
			}, {
				"namespace": "kube-system",
				"serviceName": "etcd",
				"type": "etcd"
			}, {
				"namespace": "kube-system",
				"serviceName": "cluster-controller",
				"type": "cluster-controller"
			}, {
				"namespace": "kube-system",
				"serviceName": "kube-dns",
				"servicePort": [{
					"port": 53.0,
					"protocol": "TCP",
					"type": "check"
				}, {
					"port": 53.0,
					"protocol": "UDP",
					"type": "dns"
				}],
				"type": "kube-dns"
			}]
		},
		"status": {
			"conditions": [{
				"status": false,
				"type": "Ready"
			}]
		}
	}, {
		"apiVersion": "flycloud.cn/v1",
		"kind": "Cluster",
		"metadata": {
			"annotations": {
				"name": "test"
			},
			"creationTimestamp": "2019-09-13T15:54:57Z",
			"generation": 1.0,
			"labels": {
				"template": "dev"
			},
			"name": "test",
			"namespace": "flycloud",
			"resourceVersion": "7687403",
			"selfLink": "/apis/flycloud.cn/v1/namespaces/flycloud/clusters/test",
			"uid": "d5bddb21-d63e-11e9-b5a7-005056bc7cff"
		},
		"spec": {
			"info": {
				"address": "192.168.103.60",
				"domain": [],
				"external": [{
					"labels": {
						"lb": "nginx"
					},
					"maxPort": 35000.0,
					"minPort": 33000.0,
					"tcpConfig": "system-expose-nginx-config-tcp",
					"topLb": "192.168.103.61",
					"type": "nginx",
					"udpConfig": "system-expose-nginx-config-udp"
				}],
				"harbor": {
					"address": "192.168.103.59",
					"password": "Harbor12345",
					"port": 443.0,
					"protocol": "https",
					"user": "admin"
				},
				"network": {
					"networkFlag": "calico",
					"version": "1"
				},
				"nfs": [{
					"capacity": "1",
					"ip": "192.168.103.65",
					"name": "nfs",
					"path": "/nfs/top",
					"type": "nfs"
				}],
				"port": 6443.0,
				"prometheusPort": 30003.0,
				"protocol": "https",
				"storages": []
			},
			"template": [{
				"namespace": "kube-system",
				"serviceName": "auto-scale",
				"type": "auto-scale"
			}, {
				"namespace": "kube-system",
				"serviceName": "calico-kube-controller",
				"type": "calico-cotnroller"
			}, {
				"namespace": "kube-system",
				"serviceName": "calico-node",
				"type": "calico-node"
			}, {
				"namespace": "kube-system",
				"serviceName": "default-http-backend",
				"servicePort": [{
					"port": 80.0,
					"protocol": "TCP",
					"type": "web"
				}],
				"type": "default-http-backend"
			}, {
				"namespace": "kube-system",
				"serviceName": "elasticsearch-logging-v1",
				"servicePort": [{
					"port": 9200.0,
					"protocol": "TCP",
					"type": "web"
				}, {
					"port": 9300.0,
					"protocol": "TCP",
					"type": "api"
				}],
				"type": "es"
			}, {
				"namespace": "kube-system",
				"serviceName": "etcd",
				"type": "etcd"
			}, {
				"namespace": "kube-system",
				"serviceName": "heapster",
				"servicePort": [{
					"port": 80.0,
					"protocol": "TCP",
					"type": "check"
				}],
				"type": "heapster"
			}, {
				"namespace": "kube-system",
				"serviceName": "influxdb",
				"servicePort": [{
					"port": 80.0,
					"protocol": "TCP",
					"type": "web"
				}, {
					"port": 8086.0,
					"protocol": "TCP",
					"type": "api"
				}],
				"type": "influxdb"
			}, {
				"namespace": "kube-system",
				"serviceName": "kube-apiserver",
				"type": "kube-apiserver"
			}, {
				"namespace": "kube-system",
				"serviceName": "kube-controller-manager",
				"type": "kube-controller-manager"
			}, {
				"namespace": "kube-system",
				"serviceName": "kube-dns",
				"servicePort": [{
					"port": 54.0,
					"protocol": "TCP",
					"type": "check"
				}, {
					"port": 53.0,
					"protocol": "UDP",
					"type": "dns"
				}],
				"type": "kube-dns"
			}, {
				"namespace": "kube-system",
				"serviceName": "kube-proxy",
				"type": "kube-proxy"
			}, {
				"namespace": "kube-system",
				"serviceName": "kube-scheduler",
				"type": "kube-scheduler"
			}, {
				"namespace": "kube-system",
				"serviceName": "nfs-controller",
				"type": "nfs-controller"
			}, {
				"namespace": "kube-system",
				"serviceName": "nginx-controller",
				"servicePort": [{
					"port": 80.0,
					"protocol": "TCP",
					"type": "web"
				}],
				"type": "nginx-controller"
			}, {
				"namespace": "kube-system",
				"serviceName": "node-up-down",
				"type": "node-up-down"
			}, {
				"namespace": "kube-system",
				"serviceName": "oam-api-service",
				"servicePort": [{
					"port": 8081.0,
					"protocol": "TCP",
					"type": "api"
				}],
				"type": "oam-api"
			}, {
				"namespace": "kube-system",
				"serviceName": "oam-task-service",
				"type": "oma-task"
			}, {
				"namespace": "kube-system",
				"serviceName": "terminal-service",
				"servicePort": [{
					"port": 8888.0,
					"protocol": "TCP",
					"type": "api"
				}],
				"type": "terminal"
			}]
		},
		"status": {
			"conditions": [{
				"status": true,
				"type": "Ready"
			}]
		}
	}],
	"kind": "ClusterList",
	"metadata": {
		"continue": "",
		"resourceVersion": "7758294",
		"selfLink": "/apis/flycloud.cn/v1/clusters"
	}
}

Namespaces增删改查

使用 CoreV1Api apiInstance = new CoreV1Api(); 操作

Method HTTP request Description
createNamespace POST /api/v1/namespaces 创建分区
deleteNamespace DELETE/api/v1/namespaces/{name} 删除分区
listNamespace GET /api/v1/namespaces 分区列表
patchNamespace PATCH/api/v1/namespaces/{name} 更新分区内容
readNamespace GET/api/v1/namespaces/{name} 查询指定分区详情
replaceNamespace PUT/api/v1/namespaces/{name} 替换分区内容

Node增删改查

使用 CoreV1Api apiInstance = new CoreV1Api(); 操作

Method HTTP request Description
createNode POST /api/v1/nodes 创建节点
deleteCollectionNode DELETE /api/v1/nodes 删除多个节点
deleteNode DELETE/api/v1/nodes/{name} 删除节点
listNode GET /api/v1/nodes 节点列表
patchNode PATCH/api/v1/nodes/{name} 更新节点
readNode GET /api/v1/nodes/{name} 查询指定节点
replaceNode PUT /api/v1/nodes/{name} 替换指定节点内容
replaceNodeStatus PUT/api/v1/nodes/{name}/status 修改节点状态

Pod增删改查

使用 CoreV1Api apiInstance = new CoreV1Api(); 操作

Method HTTP request Description
createNamespacedPod POST /api/v1/namespaces/{namespace}/pods 创建pod
deleteCollectionNamespacedPod DELETE/api/v1/namespaces/{namespace}/pods 删除多个pod
deleteNamespacedPod DELETE/api/v1/namespaces/{namespace}/pods/{name} 删除pod
listNamespacedPod GET /api/v1/namespaces/{namespace}/pods pod列表
patchNamespacedPod PATCH/api/v1/namespaces/{namespace}/pods/{name} 更新pod
readNamespacedPod GET/api/v1/namespaces/{namespace}/pods/{name} 查询指定pod
replaceNamespacedPod PUT/api/v1/namespaces/{namespace}/pods/{name} 替换指定pod内容

优先级

Method HTTP request Description
createPriorityClass POST /apis/scheduling.k8s.io/v1beta1/priorityclasses 创建优先级
deleteCollectionPriorityClass DELETE /apis/scheduling.k8s.io/v1beta1/priorityclasses 删除多个优先级
deletePriorityClass DELETE /apis/scheduling.k8s.io/v1beta1/priorityclasses/{name} 删除优先级
getAPIResources GET /apis/scheduling.k8s.io/v1beta1/ 获取可用资源
listPriorityClass GET /apis/scheduling.k8s.io/v1beta1/priorityclasses 优先级列表
patchPriorityClass PATCH /apis/scheduling.k8s.io/v1beta1/priorityclasses/{name} 修改优先级
readPriorityClass GET /apis/scheduling.k8s.io/v1beta1/priorityclasses/{name} 查询指定优先级
replacePriorityClass PUT /apis/scheduling.k8s.io/v1beta1/priorityclasses/{name} 替换优先级

Services增删改查

使用 CoreV1Api apiInstance = new CoreV1Api(); 操作

Method HTTP request Description
createNamespacedService POST /api/v1/namespaces/{namespace}/services 创建服务
deleteNamespacedService DELETE/api/v1/namespaces/{namespace}/services/{name} 删除服务
listNamespacedService GET /api/v1/namespaces/{namespace}/services 服务列表
patchNamespacedService PATCH/api/v1/namespaces/{namespace}/services/{name} 修改指定服务内容
readNamespacedService GET/api/v1/namespaces/{namespace}/services/{name} 查询指定服务内容
replaceNamespacedService PUT/api/v1/namespaces/{namespace}/services/{name} 替换指定服务内容

操作示例

@Test
    public void CoreV1ApiTest(){

        CoreV1Api apiInstance = new CoreV1Api();
        String pretty = "true"; // String | If 'true', then the output is pretty printed.
        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 {

            // Namespace列表
            V1NamespaceList result = apiInstance.listNamespace(null,pretty,null,null,null,null,null,null,null);

            // Node列表
            // V1NodeList result = apiInstance.listNode(null,pretty,null,null,null,null,null,null,null);

           // Service列表
            // V1ServiceList result = apiInstance.listNamespacedService("kube-system", null, null, null, null, null, null, null, null, null);

            // Service 详情
            // /api/v1/namespaces/kube-system/services/webapi-service
            // V1Service result = apiInstance.readNamespacedService("flyapi-service", "kube-system", null, null, null);

            System.out.println(result);

            // JSON
            Gson gson=new Gson();
            String s = gson.toJson(result);
            System.out.println(s);

        } catch (ApiException e) {
            System.err.println("Exception when calling CoreV1Api#listNode");
            e.printStackTrace();
        }
    }

Deployment增删改查

使用 ExtensionsV1beta1Api apiInstance = new ExtensionsV1beta1Api(); 操作

Method HTTP request Description
createNamespacedDeployment POST /apis/extensions/v1beta1/namespaces/{namespace}/deployments 创建应用
deleteCollectionNamespacedDeployment DELETE/apis/extensions/v1beta1/namespaces/{namespace}/deployments 删除多个应用
deleteNamespacedDeployment DELETE/apis/extensions/v1beta1/namespaces/{namespace}/deployments/{name} 删除应用
listNamespacedDeployment GET /apis/extensions/v1beta1/namespaces/{namespace}/deployments 应用列表
patchNamespacedDeployment PATCH/apis/extensions/v1beta1/namespaces/{namespace}/deployments/{name} 更新应用
readNamespacedDeployment GET/apis/extensions/v1beta1/namespaces/{namespace}/deployments/{name} 查询指定应用
replaceNamespacedDeployment PUT/apis/extensions/v1beta1/namespaces/{namespace}/deployments/{name} 替换指定应用内容

kubernetes-client/java 使用注意（很重要）：

  1.  Kubernetes资源内容查询：JSONPath

  2.  kubernetes-client: delete操作异常 Expected a string but was BEGIN_OBJECT at line 1 column 1912

  3.  kubernetes：CPU 和内存单位解释

  4.  kubenetes： patch更新和替换、删除资源内容

  5. kubernetes：字段选择器（field-selector）标签选择器（labels-selector）和筛选 Kubernetes 资源

  6. Kubernetes参数：dryRun理解

  7. kubernetes-client/java：Scale报错400 BadRequest 或 500 cannot unmarshal object

  8. Kubectl ：--v 接口调试，以及设置日志输出详细程度

课程分享：

  1. 课程分享：Docker+Kubernetes(k8s)微服务容器化实践

  2. 课程分享：Kubernetes(k8s)生产级实践指南 从部署到核心应用

  3. 课程分享：（极客时间）深入剖析Kubernetes

参考链接：

https://k8smeetup.github.io/docs/reference/client-libraries/

https://feisky.gitbooks.io/kubernetes/components/apiserver.html

https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.13/

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