镜像构建思路
思路：分层设计
最底层：系统层，构建自己适用的不同操作系统镜像；
中间层：根据运行环境，如php、java、python等，构建业务基础运行环境层镜像；
最上层：根据具体的业务模块，构建应用服务层镜像。
目录构建树结构
案例1：centos 7系统镜像构建
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cd /root
mkdir -p /root/docker/system/centos
cd /root/docker/system/centos
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo # 下载阿里RHEL 7 epel源
cp /etc/yum.repos.d/epel.repo epel.repo
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创建镜像文件
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vim Dockerfile# This Dockerfile # Base imageFROM centos # WhoMAINTAINER shhnwangjian [email protected] # EPELADD epel.repo /etc/yum.repos.d/
# Base pkgRUN yum install -y wget supervisor git tree net-tools sudo psmisc mysql-devel && yum clean all
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构建镜像
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docker build -t shhnwangjian/centos:base .
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案例2：基于案例1的centos系统镜像，构建python运行环境镜像
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mkdir -p /root/docker/runtime/python
cd /root/docker/runtime/python
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创建镜像文件
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vim Dockerfile# Base imageFROM shhnwangjian/centos:base
# WhoMAINTAINER shhnwangjian [email protected]# Python envRUN yum install -y python-devel python-pip supervisor
# Upgrade pipRUN pip install --upgrade pip
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构建镜像
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docker build -t shhnwangjian/python .
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案例3：构建带SSH功能的centos 7系统镜像
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mkdir -p /root/docker/system/centos-ssh
cd /root/docker/system/centos-ssh
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo # 下载阿里RHEL 7 epel源
cp /etc/yum.repos.d/epel.repo epel.repo
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创建镜像文件
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# Docker for CentOS# Base imageFROM centos # WhoMAINTAINER shhnwangjian [email protected] # EPELADD epel.repo /etc/yum.repos.d/
# Base pkgRUN yum install -y openssh-clients openssl-devel openssh-server wget supervisor git tree net-tools sudo psmisc mysql-devel && yum clean all
# For SSHDRUN ssh-****** -t rsa -f /etc/ssh/ssh_host_rsa_key
RUN ssh-****** -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key
RUN echo "root:123456" | chpasswd
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构建镜像
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docker build -t shhnwangjian/centos-ssh .
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案例4：基于案例3的centos-ssh系统镜像，构建python-ssh运行环境镜像
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mkdir -p /root/docker/runtime/python-ssh
cd /root/docker/runtime/python-ssh
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创建镜像文件
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# Base imageFROM shhnwangjian/centos-ssh
# WhoMAINTAINER shhnwangjian [email protected]# Python envRUN yum install -y python-devel python-pip supervisor
# Upgrade pipRUN pip install --upgrade pip
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构建镜像
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docker build -t shhnwangjian/python-ssh .
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案例5：基于案例4的python-ssh镜像，构建app应用服务镜像
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mkdir -p /root/docker/app/web-app
cd /root/docker/app/web-app
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应用程序文件app.py
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from flask import Flask
app = Flask(__name__)@app.route('/')
def hello(): return "Hello World!"
if __name__ == "__main__":
app.run(host="0.0.0.0", debug=True)
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python依赖包文件requirements.txt
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Flask |
supervisor配置文件app-supervisor.ini
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[program:web-api]command=/usr/bin/python2.7 /opt/app.py
process_name=%(program_name)sautostart=true
user=wwwstdout_logfile=/tmp/app.log
stderr_logfile=/tmp/app.error
[program:sshd]command=/usr/sbin/sshd -D
process_name=%(program_name)sautostart=true
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在宿主机上安装supervisor，将默认生成的supervisord.conf放入docker构建环境目录下
备注：nodaemon=true ，前台启动
创建镜像文件
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# Base imageFROM shhnwangjian/python-ssh
# WhoMAINTAINER shhnwangjian [email protected]# ADD user wwwRUN useradd -s /sbin/nologin -M www
# ADD fileADD app.py /opt/app.py
ADD requirements.txt /opt/
ADD supervisord.conf /etc/supervisord.conf
ADD app-supervisor.ini /etc/supervisord.d/
# Pip installRUN /usr/bin/pip2.7 install -r /opt/requirements.txt
# PortEXPOSE 22 5000# CMDCMD ["/usr/bin/supervisord", "-c", "/etc/supervisord.conf"]
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构建镜像
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docker build -t shhnwangjian/web-api .
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启动容器
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docker run --name web-api -d -p 88:5000 -p 8022:22 shhnwangjian/web-api
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