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python - `--context` 的 Kubernetes API 等价物是什么？

问题描述

使用kubectl命令行，我可以使用--context标志在给定上下文中运行命令，例如：

kubectl --context <MyContext> get deploy messenger

但是，当我尝试使用以下 API 列出 pod 时，似乎没有办法在上下文中传递。

 from kubernetes import client
 v1 = client.CoreV1Api()
 pods = v1.list_namespaced_pod("messenger")

上面的命令似乎给了我当前上下文中的 pod。

有没有办法使用 Python API 在不同的上下文中列出 pod？

我查看了以下文档并查找了字符串context，但没有发现任何启发性的内容。

https://kubernetes.io/docs/tasks/administer-cluster/access-cluster-api/ https://github.com/kubernetes-client/python/blob/master/kubernetes/README.md

标签： pythonkubernetes

解决方案

您可以从文件中读取上下文并将其传递给如下CoreV1Api函数

# Copyright 2016 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""
Allows you to pick a context and then lists all pods in the chosen context.
Please install the pick library before running this example.
"""

from kubernetes import client, config
from kubernetes.client import configuration
from pick import pick  # install pick using `pip install pick`


def main():
    contexts, active_context = config.list_kube_config_contexts()
    if not contexts:
        print("Cannot find any context in kube-config file.")
        return
    contexts = [context['name'] for context in contexts]
    active_index = contexts.index(active_context['name'])
    cluster1, first_index = pick(contexts, title="Pick the first context",
                                 default_index=active_index)
    cluster2, _ = pick(contexts, title="Pick the second context",
                       default_index=first_index)

    client1 = client.CoreV1Api(
        api_client=config.new_client_from_config(context=cluster1))
    client2 = client.CoreV1Api(
        api_client=config.new_client_from_config(context=cluster2))

    print("\nList of pods on %s:" % cluster1)
    for i in client1.list_pod_for_all_namespaces().items:
        print("%s\t%s\t%s" %
              (i.status.pod_ip, i.metadata.namespace, i.metadata.name))

    print("\n\nList of pods on %s:" % cluster2)
    for i in client2.list_pod_for_all_namespaces().items:
        print("%s\t%s\t%s" %
              (i.status.pod_ip, i.metadata.namespace, i.metadata.name))


if __name__ == '__main__':
    main()

代码也可以在 github 示例文件夹中找到 https://github.com/kubernetes-client/python/blob/master/examples/multiple_clusters.py

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