• Python使用 Kubernetes API 访问集群


    通过将身份认证令牌直接传给 API 服务器,可以避免使用 kubectl 代理,像这样:
    使用 grep/cut 方式:

    通过将身份认证令牌直接传给 API 服务器,可以避免使用 kubectl 代理,像这样:
    使用 grep/cut 方式:
    
    # 查看所有的集群,因为你的 .kubeconfig 文件中可能包含多个上下文
    kubectl config view -o jsonpath='{"Cluster name	Server
    "}{range .clusters[*]}{.name}{"	"}{.cluster.server}{"
    "}{end}'
    
    # 从上述命令输出中选择你要与之交互的集群的名称
    export CLUSTER_NAME="some_server_name"
    
    # 指向引用该集群名称的 API 服务器
    APISERVER=$(kubectl config view -o jsonpath="{.clusters[?(@.name=="$CLUSTER_NAME")].cluster.server}")
    
    # 获得令牌
    TOKEN=$(kubectl get secrets -o jsonpath="{.items[?(@.metadata.annotations['kubernetes.io/service-account.name']=='default')].data.token}"|base64 -d)
    
    # 使用令牌玩转 API
    curl -X GET $APISERVER/api --header "Authorization: Bearer $TOKEN" --insecure

    客户端库:https://kubernetes.io/zh/docs/reference/using-api/client-libraries/

    python举例:

    目录结构

    配置文件两种方式
    1、将集群中的~/.kube/config,重命名为kubeconfig.yaml
    代码:

    from kubernetes import  client,config
    from kubernetes.stream import stream
    import yaml
    config_file = r"D:UsersJackHePycharmProjectsJJk8sauthkubeconfig.yaml"
    config.kube_config.load_kube_config(config_file=config_file)
    Api_Instance = client.CoreV1Api()
    Api_Batch = client.BatchV1Api()
    
    #列出所有的namesapce
    for ns in Api_Instance.list_namespace().items:
        print(ns.metadata.name)
    
    #列出所有的nodes
    def list_node():
        api_response = Api_Instance.list_node()
        data = {}
        for i in api_response.items:
            data[i.metadata.name] = {"name": i.metadata.name,
                                    "status": i.status.conditions[-1].type if i.status.conditions[-1].status == "True" else "NotReady",
                                    "ip": i.status.addresses[0].address,
                                    "kubelet_version": i.status.node_info.kubelet_version,
                                    "os_image": i.status.node_info.os_image,
                                     }
        return data
    nodes = list_node()
    print(nodes)

    2、使用token形式,获取命令上文所示。
    代码:

    # -*- coding: utf-8 -*-
    from kubernetes.client import api_client
    from kubernetes.client.apis import core_v1_api
    from kubernetes import client,config
    
    
    class KubernetesTools(object):
        def __init__(self):
            self.k8s_url = 'https://192.168.1.56:6443'
    
        def get_token(self):
            """
            获取token
            :return:
            """
            with open(r'D:UsersJackHePycharmProjectsJJk8sauth	oken', 'r') as file:
                Token = file.read().strip('
    ')
                return Token
    
        def get_api(self):
            """
            获取API的CoreV1Api版本对象
            :return:
            """
            configuration = client.Configuration()
            configuration.host = self.k8s_url
            configuration.verify_ssl = False
            configuration.api_key = {"authorization": "Bearer " + self.get_token()}
            client1 = api_client.ApiClient(configuration=configuration)
            api = core_v1_api.CoreV1Api(client1)
            return api
    
        def get_namespace_list(self):
            """
            获取命名空间列表
            :return:
            """
            api = self.get_api()
            namespace_list = []
            for ns in api.list_namespace().items:
                # print(ns.metadata.name)
                namespace_list.append(ns.metadata.name)
    
            return namespace_list
    
        def get_pod_list(self):
           api = self.get_api()
           print("Listing pods with their IPs:")
           ret = api.list_pod_for_all_namespaces(watch=False)
           for i in ret.items:
               print("%s	%s	%s" % (i.status.pod_ip, i.metadata.namespace, i.metadata.name))
    
        def get_service_list(self):
            api = self.get_api()
            ret = api.list_service_for_all_namespaces(watch=False)
            for i in ret.items:
                print("%s 	%s 	%s 	%s 	%s 
    " %(i.kind,i.metadata.namespace,i.metadata.name,i.spec.cluster_ip,i.spec.ports))
    
    if __name__ == '__main__':
        namespace_list = KubernetesTools().get_namespace_list()
        pod_list = KubernetesTools().get_pod_list()
        service = KubernetesTools().get_service_list()
        print(namespace_list)
        print(pod_list)
        print(service)
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  • 原文地址:https://www.cnblogs.com/Dev0ps/p/14825543.html
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