1. 用python创建一个应用程序，使用docker构建镜像，使用k8s管理运行这个程序。

docker build -t k8s_python_code .
docker tag k8s_python_code:latest 172.27.233.13:35000/k8s_python_code:1.6
docker push 172.27.233.13:35000/k8s_python_code:1.6

kubectl  delete -f k8s_python_sample_code.service.yml
kubectl  create -f k8s_python_sample_code.service.yml

---

整个文件的目录结构

/Dockerfile

/k8s

  /k8s/k8s_python_sample_code.service.yml

/src

  /src/app.py

  /src/as.sh

  /src/requirements.txt

编写docker的配置文件，Dockerfile

WORKDIR /k8s_python_code/src

# Installing python dependencies
COPY ./src/requirements.txt /k8s_python_code/src
RUN pip install --no-cache-dir -r requirements.txt

# Copying src code to Container
COPY ./src/  /k8s_python_code/src

# Application Environment variables
ENV APP_ENV development

# Exposing Ports
EXPOSE 60001

# Setting Persistent data
VOLUME ["/app-data"]

# Running Python Application
# CMD python app.py
# ENTRYPOINT ["shell",  "as.sh"]
# ADD startup /k8s_python_code/src
RUN chmod a+x /k8s_python_code/src/as.sh
ENTRYPOINT ["/k8s_python_code/src/as.sh"]

WORKDIR为docker镜像的工作目录，expose为暴漏端口，cmd和ENTRYPOINT都是运行代码。

进行打镜像操作

docker build -t k8s_python_code .
docker tag k8s_python_code:latest 172.27.233.13:35000/k8s_python_code:0.1
docker push 172.27.233.13:35000/k8s_python_code:0.1

k8s_python_sample_code.service.yml的文件内容。

apiVersion: apps/v1
kind: Deployment
metadata:
  name: k8s
spec:
  selector:
    matchLabels:
      run: k8s
  replicas: 1
  template:
    metadata:
      labels:
        run: k8s
    spec:
      containers:
      - name: k8s
        image: 172.27.233.13:35000/k8s_python_code:0.1
        # command: [ "/bin/bash", "/k8s_python_code/src/as.sh" ]
        ports:
        - containerPort: 60001

进行pod的部署

执行：kubectl  create -f k8s_python_sample_code.service.yml

执行：k get pod -n default     查看pod的状态

看到pod没有启动，执行： k describe pod k8s-5b555cbc89-zxbrs -n default    查看具体原因

获取报错信息：Container image "172.27.233.13:35000/k8s_python_code:1.6" already present on machine

将上面的k8s_python_sample_code.service.yml中注释的 #command放开。

再执行重新部署，执行：

kubectl  delete -f k8s_python_sample_code.service.yml
kubectl  create -f k8s_python_sample_code.service.yml

在查看pod的状态

其中app.py中的代码

import sys
import os
import datetime



if __name__ == "__main__":
    fo = open("foo.txt", "w")
    fo.write( "www.runoob.com!\nVery good site!\n")
    while(1):
        print("1")

    fo.close()
    pdfPath = './pdf/mm.pdf'
    imagePath = './image'
    print("xxxxxxxxxxxxxxxxxxxxx")

如果将app.py中的循环代码，注释。查看pod 的状态

查看具体原因，执行

k describe pod k8s-db4c4b5cd-kzgsv -n default

结尾感谢忠兴同学帮助调bug。