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：

# 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\tServer\n"}{range .clusters[*]}{.name}{"\t"}{.cluster.server}{"\n"}{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:\Users\JackHe\PycharmProjects\JJ\k8s\auth\kubeconfig.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:\Users\JackHe\PycharmProjects\JJ\k8s\auth\token', 'r') as file:
            Token = file.read().strip('\n')
            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\t%s\t%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 \t%s \t%s \t%s \t%s \n" %(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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