python3 kubernetes api的使用示例

github：https://github.com/kubernetes-client/python

安装

pip install kubernetes二、认证1、kubeconfig文件认证

首先引入SDK支持库。然后将 ~/.kube 的config文件的内容复制到本地目录，保存为文件kubeconfig.yaml，然后运行下面的python代码。

[root@k8s-m ~]# cp .kube/config kubeconfig.yaml#使用from kubernetes import client, configconfig.kube_config.load_kube_config(config_file='/root/kubeconfig.yaml')三、api使用1、列出资源信息

from kubernetes import client, configconfig.kube_config.load_kube_config(config_file='/root/kubeconfig.yaml')#获取API的CoreV1Api版本对象v1 = client.CoreV1Api()#列出 namespacesfor ns in v1.list_namespace().items: print(ns.metadata.name) #列出所有的servicesret = v1.list_service_for_all_namespaces(watch=False)for i in ret.items: print('%s t%s t%s t%s t%s n' % (i.kind, i.metadata.namespace, i.metadata.name, i.spec.cluster_ip, i.spec.ports )) #列出所有的podret = v1.list_pod_for_all_namespaces(watch=False)for i in ret.items: print('%st%st%s' % (i.status.pod_ip, i.metadata.namespace, i.metadata.name))#列出所有deployret = v1.list_deployments_for_all_namespaces(watch=False)for i in ret.items: print('%st%st%s' % (i.status.pod_ip, i.metadata.namespace, i.metadata.name)) ##列出其他资源和以上类似，不懂可以查看(kubectl api-resources)2、创建k8s资源对象

github:https://github.com/kubernetes-client/python/tree/master/examples

创建资源（提前写好yaml资源清单）

#创建deploy[root@k8s-m ~]# cat create_deploy.pyfrom os import pathimport yamlfrom kubernetes import client, configdef main(): config.load_kube_config() with open(path.join(path.dirname(__file__), '/root/deploy.yaml')) as f: dep = yaml.safe_load(f) k8s_apps_v1 = client.AppsV1Api() resp = k8s_apps_v1.create_namespaced_deployment( body=dep, namespace='default') print('Deployment created. status=’%s’' % resp.metadata.name)main()[root@k8s-m ~]# kubectl get pod NAME READY STATUS RESTARTS AGEmydeploy-6946c867dc-bgcld 1/1 Running 0 40smydeploy-6946c867dc-rdnvj 1/1 Running 0 40s[root@k8s-m ~]# kubectl get deployNAME READY UP-TO-DATE AVAILABLE AGEmydeploy 2/2 2 2 44s#创建pod例子（其它资源得自己查源码自己找对应的API）[root@k8s-m ~]# cat create_pod.py from os import pathimport yamlfrom kubernetes import client, configdef main(): config.load_kube_config() with open(path.join(path.dirname(__file__), '/root/pod.yaml')) as f: dep = yaml.safe_load(f) k8s_core_v1 = client.CoreV1Api() resp = k8s_core_v1.create_namespaced_pod( body=dep, namespace='default') print('Pod created. status=’%s’' % resp.metadata.name)if __name__ == ’__main__’: main()##[root@k8s-m ~]# python3 create_pod.py Pod created. status=’nginx-pod’[root@k8s-m ~]# kubectl get pod nginx-podNAME READY STATUS RESTARTS AGEnginx-pod 1/1 Running 0 8s3、删除资源（我这里展示pod例子，其它资源删除差不多）

参考地址:/usr/local/python3/lib/python3.6/site-packages/kubernetes/client/

[root@k8s-m ~]# cat dp.pyfrom os import pathimport yamlfrom kubernetes import client, configdef main(): config.load_kube_config() k8s_core_v1 = client.CoreV1Api() resp = k8s_core_v1.delete_namespaced_pod(namespace='default',name=’nginx-pod’) print('delete Pod ')[root@k8s-m ~]# python3 dp.pydelete Pod4、查看资源（类似kubectl get pod xxx -o json）

#查看(read)[root@k8s-m ~]# cat rp.py from os import pathimport yamlfrom kubernetes import client, configdef main(): config.load_kube_config() k8s_core_v1 = client.CoreV1Api() resp = k8s_core_v1.read_namespaced_pod(namespace='default',name=’nginx-pod’) print('read Pod ') #详细信息 print(resp) #指定信息 print(resp.spec.containers[0].image)if __name__ == ’__main__’: main()[root@k8s-m ~]# python3 rp.py |tail ’host_ip’: ’172.31.250.229’, ’init_container_statuses’: None, ’message’: None, ’nominated_node_name’: None, ’phase’: ’Running’, ’pod_ip’: ’10.244.167.134’, ’qos_class’: ’BestEffort’, ’reason’: None, ’start_time’: datetime.datetime(2019, 8, 30, 9, 13, 49, tzinfo=tzutc())}}nginx5、修改

[root@k8s-m ~]# cat pp.py from os import pathimport yamlfrom kubernetes import client, configdef main(): config.load_kube_config() k8s_core_v1 = client.CoreV1Api() old_resp = k8s_core_v1.read_namespaced_pod(namespace='default',name=’nginx-pod’) old_resp.spec.containers[0].image = 'nginx:alpine' #修改镜像 new_resp = k8s_core_v1.patch_namespaced_pod(namespace='default',name=’nginx-pod’,body=old_resp) print(new_resp.spec.containers[0].image)if __name__ == ’__main__’: main()[root@k8s-m ~]# python3 pp.py nginx:alpine

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