python3kubernetesapi의 사용 예시

1. 설치

github: https://github.com/kubernetes-client/python
설치

pip install kubernetes

인증

1. kubeconfig 파일 인증

먼저 SDK 지원 라이브러리를 도입하십시오.그리고 ~/.kube의config 파일의 내용을 로컬 디렉터리로 복사하여 파일kubeconfig로 저장합니다.yaml, 다음의python 코드를 실행합니다.

[root@k8s-m ~]# cp .kube/config  kubeconfig.yaml

# 
from kubernetes import client, config
config.kube_config.load_kube_config(config_file="/root/kubeconfig.yaml")

3.api 사용

1. 리소스 정보 나열

from kubernetes import client, config
config.kube_config.load_kube_config(config_file="/root/kubeconfig.yaml")

# API CoreV1Api 
v1 = client.CoreV1Api()

#  namespaces
for ns in v1.list_namespace().items:
  print(ns.metadata.name)
  
# 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 
" % (i.kind, i.metadata.namespace, i.metadata.name, i.spec.cluster_ip, i.spec.ports ))
  
# 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))

# 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))
  
## ， (kubectl api-resources)

2. k8s 자원 대상 만들기

github: https://github.com/kubernetes-client/python/tree/master/examples
자원 만들기 (yaml 자원 목록 미리 쓰기)

# 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


# pod （ 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. 자원 삭제 (pod 예를 보여 드리겠습니다. 다른 자원 삭제가 많지 않습니다)

참고 주소:/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. 자원 보기(kubectl getpod xxx-o json 유사)

# (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 ")
  # 
  print(resp)
  # 
  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. 수정

[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"
  # 
  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

이상은python3kubernetesapi의 사용 예시에 대한 상세한 내용입니다. 더 많은python3kubernetesapi의 사용에 관한 자료는 저희 다른 관련 글을 주목해 주십시오!