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Install Python 3.7.5 on CentOS 7 by source tarball

· One min read

目前 CentOS 7 的 yum repo 中只有 Python 3.6.8, 项目中要使用 3.7.5, 只能从源码安装

  1. 安装依赖组件
# yum install gcc openssl-devel bzip2-devel libffi-devel
  1. 下载 Python 3.7.5 源码包, 解压 From https://www.python.org/downloads/release/python-375/
# cd /usr/src
# curl https://www.python.org/ftp/python/3.7.5/Python-3.7.5.tgz -O
# tar zxvf Python-3.7.5.tgz
  1. 配置安装
# cd /usr/src/Python-3.7.5
# ./configure --enable-optimizations
# make altinstall
  1. 创建 python 软链接

安装后的 Python 3.7 执行文件位于: /usr/local/bin/python3.7

# ln -s /usr/local/bin/python3.7 /usr/bin/python3
# ln -s /usr/bin/python3 /usr/bin/python

# python -V
Python 3.7.5
  1. 清理
# rm -f /usr/src/Python-3.7.5.tgz

[Kubernetes] Create deployment, service by Python client

· 2 min read

Install Kubernetes Python Client and PyYaml:

# pip install kubernetes pyyaml

1. Get Namespaces or Pods by CoreV1Api:

# -*- coding: utf-8 -*-
from kubernetes import client, config, utils

config.kube_config.load_kube_config(config_file="../kubecfg.yaml")
coreV1Api = client.CoreV1Api()

print("\nListing all namespaces")
for ns in coreV1Api.list_namespace().items:
    print(ns.metadata.name)

print("\nListing pods with their IP, namespace, names:")
for pod in coreV1Api.list_pod_for_all_namespaces(watch=False).items:
    print("%s\t\t%s\t%s" % (pod.status.pod_ip, pod.metadata.namespace, pod.metadata.name))

2. Create Deployment and Service by AppsV1Api:

# -*- coding: utf-8 -*-
from kubernetes import client, config, utils
import yaml

config.kube_config.load_kube_config(config_file="../kubecfg.yaml")
yamlDeploy = open( r'deploy.yaml')
jsonDeploy = yaml.load(yamlDeploy, Loader = yaml.FullLoader)

yamlService = open(r'service.yaml')
jsonService = yaml.load(yamlService, Loader = yaml.FullLoader)

appsV1Api = client.AppsV1Api()

if jsonDeploy['kind'] == 'Deployment':
    appsV1Api.create_namespaced_deployment(
        namespace="default", body = jsonDeploy
    )

if jsonService['kind'] == 'Service':
    coreV1Api.create_namespaced_service(
        namespace="default",
        body=jsonService
    )

3. Create ANY type of objects from a yaml file by utils.create_from_yaml, you can put multiple resources in one yaml file:

# -*- coding: utf-8 -*-
from kubernetes import client, config, utils

config.kube_config.load_kube_config(config_file="../kubecfg.yaml")

k8sClient = client.ApiClient()
utils.create_from_yaml(k8sClient, "deploy-service.yaml")

Reference: https://github.com/kubernetes-client/python/blob/6709b753b4ad2e09aa472b6452bbad9f96e264e3/examples/create_deployment_from_yaml.py https://stackoverflow.com/questions/56673919/kubernetes-python-api-client-execute-full-yaml-file

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