向docker镜像中传递变量的两种方式
Posted 潇湘神剑
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测试用到的python文件:
#!/usr/bin/env python3 #conding: utf-8 from http.server import HTTPServer, BaseHTTPRequestHandler import json import sys import socket def hostname(): return socket.gethostname() def ipa(): return socket.gethostbyname(hostname()) data = {hostname(): ipa()} def httpserver(ipadd=\'127.0.0.1\',sport=8888): host = (ipadd, sport) server = HTTPServer(host, Resquest) server.serve_forever() class Resquest(BaseHTTPRequestHandler): def do_GET(self): self.send_response(200) self.send_header(\'Content-type\', \'application/json\') self.end_headers() self.wfile.write(json.dumps(data).encode()) if len(sys.argv) == 1: httpserver() elif len(sys.argv) == 3: httpserver(sys.argv[1],eval(sys.argv[2]))
方式一
1、方式一所用到的Dockerfile文件
FROM centos:7 MAINTAINER "1072051214@qq.com" COPY CentOS-Base.repo epel.repo /etc/yum.repos.d/ RUN yum install python3 net-tools -y && \\ yum clean all COPY ["app.py","/tmp"] ENTRYPOINT ["python3","/tmp/app.py"] CMD ["localhost","8888"]
在该Dockerfile文件中,ENTRYPOINT中定义了需要在镜像中执行的py文件;而CMD定义了py文件所需要的默认参数;
2、构建镜像
在Dockerfile存在的同级目录下放入构建所需的app.py、CentOS-Base.repo、epel.repo文件;
在Dockerfile目录下执行构建命令
docker build -t zhang/python:v0.3 ./
3、测试效果
#查看镜像 [root@master dockerfile]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE zhang/python v0.3 ef2f8644ab79 6 hours ago 278 MB
#前台运行,先测试默认值是否生效
[root@master dockerfile]# docker run --rm zhang/python:v0.3
#再开一个终端
[root@master ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
cb38dedce26d zhang/python:v0.3 "python3 /tmp/app...." 2 minutes ago Up 2 minutes reverent_kowalevski
[root@master ~]# docker exec -it cb38dedce26d /bin/bash
[root@cb38dedce26d /]# netstat -ntl
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 127.0.0.1:8888 0.0.0.0:* LISTEN
#前台运行,测试传递参数进去是否生效
[root@master dockerfile]# docker run --rm zhang/python:v0.3 172.17.0.3 8080
#再开一个终端
[root@master ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
f43e54f80660 zhang/python:v0.3 "python3 /tmp/app...." 24 seconds ago Up 24 seconds laughing_torvalds
[root@master ~]# docker exec -it f43e54f80660 /bin/bash
[root@f43e54f80660 /]# netstat -ntl
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 172.17.0.3:8080 0.0.0.0:* LISTEN
方式二
1、方式二所用到的Dockerfile文件
FROM centos:7 MAINTAINER "1072051214@qq.com" COPY CentOS-Base.repo epel.repo /etc/yum.repos.d/ RUN yum install python3 net-tools -y && \\ yum clean all COPY ["app.py","/tmp"] ENV HOST="localhost" ENV PORT="8888" CMD python3 /tmp/app.py $HOST $PORT
在该Dockerfile文件中,用ENV定义变量默认值;用CMD定义要运行的py文件;
2、构建镜像
在Dockerfile存在的同级目录下放入构建所需的app.py、CentOS-Base.repo、epel.repo文件;
在Dockerfile目录下执行构建命令
docker build -t zhang/python:v0.6 ./
3、测试效果
#查看镜像 [root@master dockerfile]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE zhang/python v0.6 ccb36fd6ad19 2 hours ago 278 MB zhang/python v0.3 ef2f8644ab79 6 hours ago 278 MB
#前台运行,先测试默认值是否生效
[root@master dockerfile]# docker run --rm zhang/python:v0.6
#再开一个终端
[root@master ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
f577e9f651bb zhang/python:v0.6 "/bin/sh -c \'pytho..." About a minute ago Up About a minute nifty_cray
[root@master ~]# docker exec -it f577e9f651bb /bin/bash
[root@f577e9f651bb /]# netstat -ntl
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 127.0.0.1:8888 0.0.0.0:* LISTEN
#前台运行,测试传递参数进去是否生效(-e和--env都可以)
[root@master dockerfile]# docker run --rm --env HOST=172.17.0.3 --env PORT=8085 zhang/python:v0.6
#再开一个终端
[root@master ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
0c631fd54ad0 zhang/python:v0.6 "/bin/sh -c \'pytho..." 35 seconds ago Up 34 seconds eager_yalow
[root@master ~]# docker exec -it 0c631fd54ad0 /bin/bash
[root@0c631fd54ad0 /]# netstat -ntl
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 172.17.0.3:8085 0.0.0.0:* LISTEN
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