k8s_inspect.py

#!/usr/bin/env python3# -*- coding: utf-8 -*-""" Kubernetes 集群健康巡检脚本 检查内容： - 节点是否处于 Ready 状态 - Pod 是否正常运行（跳过已完成的 Job） - Deployment 是否达到期望副本数 - Service 是否有可用的后端 Endpoints 使用方法： python3 k8s_inspect.py 依赖安装（建议在虚拟环境中）： pipinstallkubernetes"""importsys from kubernetesimportclient, config from kubernetes.client.restimportApiException def load_kube_config():"""加载 Kubernetes 配置：优先尝试 in-cluster 模式，否则使用 kubeconfig 文件""" try: config.load_incluster_config()print("[成功] 使用集群内配置（in-cluster config）")except config.ConfigException: try: config.load_kube_config()print("[成功] 使用本地 kubeconfig 文件")except config.ConfigException as e: print(f"[失败] 无法加载 Kubernetes 配置: {e}")sys.exit(1)def check_nodes():"""检查所有节点是否就绪（Ready）""" print("\n[信息] 正在检查节点状态...")v1=client.CoreV1Api()try: nodes=v1.list_node().itemsifnot nodes: print("[警告] 未发现任何节点")returnFalse all_ready=Truefornodeinnodes: name=node.metadata.name ready=any(cond.type=="Ready"and cond.status=="True"forcondinnode.status.conditions or[])ifnot ready: print(f"[错误] 节点 {name} 未就绪（NotReady）")all_ready=False else: print(f"[正常] 节点 {name} 已就绪")returnall_ready except ApiException as e: print(f"[错误] 获取节点列表失败: {e}")returnFalse def check_pods():"""检查所有命名空间中的 Pod 状态，跳过已完成的 Job Pod""" print("\n[信息] 正在检查 Pod 状态...")v1=client.CoreV1Api()try: pods=v1.list_pod_for_all_namespaces().itemsifnot pods: print("[信息] 未发现任何 Pod")returnTrue all_ok=Trueforpodinpods: namespace=pod.metadata.namespace name=pod.metadata.name phase=pod.status.phase is_job_pod=(pod.metadata.owner_references and any(owner.kind=="Job"forownerinpod.metadata.owner_references))ifis_job_pod and phasein("Succeeded","Completed"):continueifphase=="Running":continueelifphase=="Pending":continueelifany(c.state.waiting and c.state.waiting.reason=="CrashLoopBackOff"forcin(pod.status.container_statuses or[])): print(f"[错误] Pod {namespace}/{name} 处于 CrashLoopBackOff 状态")all_ok=False else: print(f"[警告] Pod {namespace}/{name} 状态异常: {phase}")all_ok=Falsereturnall_ok except ApiException as e: print(f"[错误] 获取 Pod 列表失败: {e}")returnFalse def check_deployments():"""检查所有 Deployment 是否达到期望的可用副本数""" print("\n[信息] 正在检查 Deployment 状态...")apps_v1=client.AppsV1Api()try: deployments=apps_v1.list_deployment_for_all_namespaces().itemsifnot deployments: print("[信息] 未发现任何 Deployment")returnTrue all_ok=Truefordepindeployments: namespace=dep.metadata.namespace name=dep.metadata.name desired=dep.spec.replicas or0available=dep.status.available_replicas or0ifavailable<desired: print(f"[错误] Deployment {namespace}/{name} 可用副本不足: {available}/{desired}")all_ok=Falsereturnall_ok except ApiException as e: print(f"[错误] 获取 Deployment 列表失败: {e}")returnFalse def check_services():"""检查每个带 selector 的 Service 是否有可用的 Endpoints""" print("\n[信息] 正在检查 Service 的 Endpoints...")v1=client.CoreV1Api()try: services=v1.list_service_for_all_namespaces().items services=[sforsinservicesifs.spec.selector]ifnot services: print("[信息] 未发现带 selector 的 Service")returnTrue all_ok=Trueforsvcinservices: namespace=svc.metadata.namespace name=svc.metadata.name try: endpoints=v1.read_namespaced_endpoints(name, namespace)ifnot endpoints.subsets: print(f"[错误] Service {namespace}/{name} 没有可用的后端 Endpoints")all_ok=False except ApiException as e: print(f"[警告] 读取 Service {namespace}/{name} 的 Endpoints 失败: {e}")all_ok=Falsereturnall_ok except ApiException as e: print(f"[错误] 获取 Service 列表失败: {e}")returnFalse def main():"""主函数：执行检查并汇总结果""" print("开始 Kubernetes 集群健康巡检...")load_kube_config()node_ok=check_nodes()pod_ok=check_pods()deploy_ok=check_deployments()svc_ok=check_services()print("\n========== 巡检结果汇总 ==========")print(f"节点状态: {'正常' if node_ok else '异常'}")print(f"Pod 状态: {'正常' if pod_ok else '异常'}")print(f"Deployment: {'正常' if deploy_ok else '异常'}")print(f"Service 后端: {'正常' if svc_ok else '异常'}")ifall([node_ok, pod_ok, deploy_ok, svc_ok]): print("\n集群整体健康，无异常！")sys.exit(0)else: print("\n集群存在异常，请根据上述信息排查！")sys.exit(1)if__name__=="__main__":main()