k8s二次开发 使用python （Kubernetes Python Client）

一.在k8s master获取API cluster URL与token

1.抓取Cluster URL地址

# APISERVER=$(kubectl config view --minify | grep server | cut -f 2- -d ":" | tr -d " ")

# echo $APISERVER

下面python脚本要使用，我获取的是：https://192.168.1.202:6443

2.创建k8s admin-token

# mkdir -p /kube/role

# cd /kube/role

# vi admin-token.yaml

 

kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: admin
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
roleRef:
  kind: ClusterRole
  name: cluster-admin
  apiGroup: rbac.authorization.k8s.io
subjects:
- kind: ServiceAccount
  name: admin
  namespace: kube-system
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: admin
  namespace: kube-system
  labels:
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile

# kubectl create -f admin-token.yaml

3.获取token值

# kubectl describe secret/$(kubectl get secret -nkube-system |grep admin|awk '{print $1}') -nkube-system

最后将token与APISERVER地址返回内容复制到python client主机上, 供脚本使用.

二、 在python client主机上编写脚本

1. 创建目录结构

# mkdir -p /kube/auth

# cd /kube/auth

# vim token.txt

将刚才获取的Token字符串复制到该文件

这里我们获取的token会引入到我们的脚本下, 作为bearer authorization的api key与远程k8s API建立认证连接.

2. 编写python client脚本，获取的pod信息

# vi k8s.py

from kubernetes.client import api_client
from kubernetes.client.apis import core_v1_api


def test_service_apis():
    from kubernetes import client
    k8s_url = 'https://192.168.1.124:6443'
    with open('/kube/auth/token.txt', 'r') as file:
        Token = file.read().strip('\n')
    configuration = client.Configuration()
    configuration.host = k8s_url
    configuration.verify_ssl = False
    configuration.api_key = {"authorization": "Bearer " + Token}
    client1 = api_client.ApiClient(configuration=configuration)
    api = core_v1_api.CoreV1Api(client1)
    ret = api.list_pod_for_all_namespaces(watch=False)
    print(ret)

test_service_apis()