docker镜像制作

docker 镜像制作

以制作openeuler:22.03为例

• docker pull openeuler/openeuler:22.03拉取指定版本镜像，如果失败需要设置docker的源

• 现在openeuler:22.03中需要内置一些rpm，python3.10.9、以及whl

  docker run -itd --name openeuler-22.03 -v /tmp:/tmp openeuler/openeuler:22.03

  docker exec -it openeuler-22.03 bash

  宿主机执行：

  cd /tmp

  yum -y install rpm_name

  宿主机下载pthon3.10.9源码包，依赖rpm包

  容器中执行cd /tmp；rpm -Uvh --nodeps $(ls *.rpm) ；源码编译python3.10.9

• 宿主机

  生成新的镜像openeuler:22.03-mod

  docker commit -a “user and email” -m “commit msg” openeuler-22.03 openeuler:22.03-mod

• 项目打包到openeuler:22.03-mod中

  项目app中可能需要新的whl包，rpm包，需要事先下载到对应pip、rpm目录

  # 启动容器
  docker run --network host -itd --name app \
   -v $(pwd)/pip:/pip \
   -v $(pwd)/rpm:/rpm \
   -w /app \ # 容器内部程序的工作目录
   openeuler:22.03-mod \
   /bin/bash || exit -1
  
  
  # 进入容器并执行依赖安装
  docker exec -it app /bin/bash -c 'cd /pip;python3 -m pip install --upgrade --no-deps $(ls);cd /rpm;rpm -Uvh --nodeps $(ls)' || exit -1
  
  # 将项目app-master拷贝到容器/app目录
  docker cp app-master app:/app || exit -1
  
  # 导出容器为app.rootfs.tar
  docker container export -o app.rootfs.tar app || exit -1
  
  # 生成镜像app:0.1
  docker image import app.rootfs.tar app:0.1 || exit -1
  
  # 删除文件
  rm app.rootfs.tar || exit -1
  # 停止删除app容器
  docker stop app || exit -1
  docker rm app || exit -1
  

• 一般app项目都需要有个监控程序，用于监控进程挂掉之后，重新启动

#!/usr/bin/python3
import subprocess
import time
def get_process_id(process_nm):
    pid = subprocess.run(["ps -ef | grep -w '{}' | grep -v grep | awk '{}'".format(process_nm, '{print $2}')], shell=True)
    
while True:
    pid = get_process_id("start_app")
    print('pid:', pid)
    if not pid:
        subprocess.run(['python3 start_app.py'], shell=True)
    time.sleep(5)

• 生成docker-compose.yaml文件，用于拉取容器

  version: '3'
  services:
    app:
      container_name: app
      image: app:0.1
      network_mode: host       # 使用主机网络
      privileged: true         # 启用特权模式
      working_dir: /app/app-master
      command: ["python3", "run_app.py"]