如何在python3项目中使用kubernetesapi-创新互联
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一、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, config config.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, config config.kube_config.load_kube_config(config_file="/root/kubeconfig.yaml") #获取API的CoreV1Api版本对象 v1 = client.CoreV1Api() #列出 namespaces for ns in v1.list_namespace().items: print(ns.metadata.name) #列出所有的services ret = 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pod ret = v1.list_pod_for_all_namespaces(watch=False) for i in ret.items: print("%s\t%s\t%s" % (i.status.pod_ip, i.metadata.namespace, i.metadata.name)) #列出所有deploy ret = v1.list_deployments_for_all_namespaces(watch=False) for i in ret.items: print("%s\t%s\t%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.py from os import path import yaml from kubernetes import client, config def 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 AGE mydeploy-6946c867dc-bgcld 1/1 Running 0 40s mydeploy-6946c867dc-rdnvj 1/1 Running 0 40s [root@k8s-m ~]# kubectl get deploy NAME READY UP-TO-DATE AVAILABLE AGE mydeploy 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 path import yaml from kubernetes import client, config def 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-pod NAME READY STATUS RESTARTS AGE nginx-pod 1/1 Running 0 8s
3、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.py from os import path import yaml from kubernetes import client, config def 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.py delete Pod
4、查看资源(类似kubectl get pod xxx -o json)
#查看(read) [root@k8s-m ~]# cat rp.py from os import path import yaml from kubernetes import client, config def 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())}} nginx
5、修改
[root@k8s-m ~]# cat pp.py from os import path import yaml from kubernetes import client, config def 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
上述就是小编为大家分享的如何在python3项目中使用kubernetes api了,如果刚好有类似的疑惑,不妨参照上述分析进行理解。如果想知道更多相关知识,欢迎关注创新互联行业资讯频道。
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