向docker镜像中传递变量的两种方式
作者：互联网
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
标签：变量,zhang,python,py,master,镜像,docker,root 来源： https://www.cnblogs.com/zhangzhide/p/14843537.html