python构建镜像例子(安装vim和telnet)

 

1.创建脚本存放目录
mkdir /root/docker_test

 

2.准备测试脚本
vi /root/docker_test/script.py

 

[root@master docker_test]# more script.py 
#!/usr/bin/python

#_*_coding:utf-8_*_
import time

while True:
    print("helloworld",flush=True)
    time.sleep(10)

 

 

 

 

 

3.主备docker file文件
vi /root/docker_test/Dockerfile

#拉取Docker环境
#FROM python
FROM registry.cn-shenzhen.aliyuncs.com/hxlk8s/python:3.13

RUN apt-get update && apt install -y vim && apt install -y telnet

#设置工作目录,容器中的目录,不是宿主机的目录
WORKDIR /app
#将dockerfile同级文件copy到docker容器内app目录下
COPY . /app
#运行python的命令
CMD ["python", "/app/script.py"]

 

 

4.构建镜像

在dockerfile同级目录下运行下列指令创建一个镜像
[root@node1 docker_test]#cd /root/docker_test
[root@node1 docker_test]#docker build -t python_test .

 

5.查看刚才制作的镜像

 

[root@master docker_test]# docker images
REPOSITORY                                          TAG        IMAGE ID       CREATED         SIZE
python_test                                         latest     bd5d93f9058d   7 minutes ago   1.08GB

 

 

6.运行Docker容器
[root@node1 docker_test]# docker run -d python_test:latest
700ec3da071074ea939ad80c47ef8200c0b8cebec70aba4ded4c2355e314387f

 

7.查看docker容器运行情况

[root@master docker_test]# docker ps
CONTAINER ID   IMAGE                COMMAND                  CREATED         STATUS         PORTS     NAMES
a7b3e697f489   python_test:latest   "python /app/script.…"   8 minutes ago   Up 8 minutes             stoic_cray

[root@master docker_test]# docker logs a7b3e697f489
helloworld
helloworld
helloworld
helloworld
helloworld
helloworld
helloworld
helloworld
helloworld
helloworld
helloworld
helloworld

注意：带上flush=True才会持续打印输出

print("helloworld",flush=True)

 

8.登录容器查看安装的vim和telnet工具

[root@master docker_test]# docker exec -it a7b3e697f489 /bin/bash
root@a7b3e697f489:/app# which vim
/usr/bin/vim
root@a7b3e697f489:/app# which telnet
/usr/bin/telnet