Creating the Dockerfile to Automatically Build the Image:

1.启动一个容器：

docker run -i -t -p 7000:80 centos7:cg /bin/bash

注释：centos7:cg这个镜像是在busybox +sshd+systemd+epel还加了监控工具sar+netstat等的镜像

　　在镜像中的操作:　　　　

41 yum update

42 yum -y install tar git curl nano wget dialog net-tools

43 yum -y install build-essential

44 yum install -y python python-dev python-distribute python-pip

45 yum install -y python python-dev python-distribute python-pip

46 yum install -y python python-dev*

47 yum install -y python-pip*

48 yum provides python-pip

49 yum provides pip

50 yum provides pip

51 yum search pip

52 pip

53 yum -y install pip

54 yum -y install pip*

55 yum -y --enablerepo=epel install python-pip

56 pip install flask

57 pip install --upgrade pip

58 pip install flask

59 mkdir my_application

60 cd my_application

61 vi app.py

  cat app.py

from flask import Flaskapp = Flask(__name__)@app.route("/")def hello():    return "Hello World!"if __name__ == "__main__":    app.run()

62 vi requirements.txt

63 pip install cherrypy

64 vi server.py

# Import your application as:# from app import application# Example:from app import app# Import CherryPyimport cherrypyif __name__ == '__main__':    # Mount the application    cherrypy.tree.graft(app, "/")    # Unsubscribe the default server    cherrypy.server.unsubscribe()    # Instantiate a new server object    server = cherrypy._cpserver.Server()    # Configure the server object    server.socket_host = "0.0.0.0"    server.socket_port = 80    server.thread_pool = 30    # For SSL Support    # server.ssl_module            = 'pyopenssl'    # server.ssl_certificate       = 'ssl/certificate.crt'    # server.ssl_private_key       = 'ssl/private.key'    # server.ssl_certificate_chain = 'ssl/bundle.crt'    # Subscribe this server    server.subscribe()    # Start the server engine (Option 1 *and* 2)    cherrypy.engine.start()    cherrypy.engine.block()

65 mkdir app

66 python server.py

67 pwd

68 history

最后在容器中的结构：

/my_application    |    |- requirements.txt  # File containing list of dependencies    |- /app              # Application module (which should have your app)    |- app.py            # WSGI file containing the "app" callable    |- server.py         # Optional: To run the app servers (CherryPy)

2.现在开始创建Dockerfile:

[root@node ~]# cat Dockerfile

############################################################

# Dockerfile to build Python WSGI Application Containers

# Based on jt

############################################################

# Set the base image to Ubuntu

FROM centos7:cg

# File Author / Maintainer

MAINTAINER Maintaner Name

# Add the application resources URL

#RUN echo "deb http://archive.ubuntu.com/ubuntu/ $(lsb_release -sc) main universe" >> /etc/apt/sources.list

# Update the sources list

RUN yum update

# Install basic applications

RUN yum install --enablerepo=epel -y tar git curl nano wget dialog net-tools

# Install Python and Basic Python Tools

RUN yum install --enablerepo=epel -y python python-dev python-distribute python-pip

#genxin

RUN pip install --upgrade pip

# Copy the application folder inside the container

ADD /my_application /my_application

# Get pip to download and install requirements:

RUN pip install -r /my_application/requirements.txt

# Expose ports

EXPOSE 80

# Set the default directory where CMD will execute

WORKDIR /my_application

# Set the default command to execute

# when creating a new container

# i.e. using CherryPy to serve the application

CMD python server.py &

[root@node ~]#

注意这里：ADD /my_application /my_application

我们可以换成：

RUN git clone [application repository URL] 至此我们用dockefile成功构建了一个镜像并访问成功 docker build -t my_application_img .

[root@node ~]# docker run -p 7001:80 -i -t --name jt my_application_img

[02/Jun/2017:20:05:49] ENGINE Bus STARTING

[02/Jun/2017:20:05:49] ENGINE Started monitor thread 'Autoreloader'.

[02/Jun/2017:20:05:49] ENGINE Started monitor thread '_TimeoutMonitor'.

[02/Jun/2017:20:05:49] ENGINE Serving on http://0.0.0.0

[02/Jun/2017:20:05:49] ENGINE Bus STARTED

 

 

 

 好了，成功用dockerfile发布了一个小代码

私有仓库搭建：

mkdir -p /opt/data/registry

因为是centos7所以都要在所有节点上修改：

vi /usr/lib/systemd/system/docker.service

ExecStart=/usr/bin/dockerd --insecure-registry 192.168.36.151:5000

systemctl daemon-reload

systemctl restart docker

启动一个注册容器：

docker run -d -p 5000:5000 -v /opt/data/registry:/var/lib/registry registry

为上传镜像打个标签：

docker tag busybox 192.168.36.151:5000/test

另外一个机器上面测试成功：

[root@node ~]# docker pull 192.168.36.151:5000/test

Using default tag: latest

Trying to pull repository 192.168.36.151:5000/test ...

latest: Pulling from 192.168.36.151:5000/test

Digest: sha256:32a0e4c673002bd7d4585587fb06ae9826cda9808317561b790ebef374bbb312