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
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
创建镜像文件
vim Dockerfile
# This Dockerfile # Base image
FROM centos # Who
MAINTAINER shhnwangjian xxx@163.com # EPEL
ADD epel.repo /etc/yum.repos.d/ # Base pkg
RUN yum install -y wget supervisor git tree net-tools sudo psmisc mysql-devel && yum clean all
构建镜像
docker build -t shhnwangjian/centos:base .
案例2：基于案例1的centos系统镜像，构建python运行环境镜像
mkdir -p /root/docker/runtime/python
cd /root/docker/runtime/python
创建镜像文件
vim Dockerfile
# Base image
FROM shhnwangjian/centos:base # Who
MAINTAINER shhnwangjian xxx@163.com # Python env
RUN yum install -y python-devel python-pip supervisor # Upgrade pip
RUN pip install --upgrade pip
构建镜像
docker build -t shhnwangjian/python .
案例3：构建带SSH功能的centos 7系统镜像
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
创建镜像文件
# Docker for CentOS # Base image
FROM centos # Who
MAINTAINER shhnwangjian xxx@163.com # EPEL
ADD epel.repo /etc/yum.repos.d/ # Base pkg
RUN yum install -y openssh-clients openssl-devel openssh-server wget supervisor git tree net-tools sudo psmisc mysql-devel && yum clean all # For SSHD
RUN ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key
RUN ssh-keygen -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key
RUN echo "root:123456" | chpasswd
构建镜像
docker build -t shhnwangjian/centos-ssh .
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
mkdir -p /root/docker/runtime/python-ssh
cd /root/docker/runtime/python-ssh
创建镜像文件
# Base image
FROM shhnwangjian/centos-ssh # Who
MAINTAINER shhnwangjian xxx@163.com # Python env
RUN yum install -y python-devel python-pip supervisor # Upgrade pip
RUN pip install --upgrade pip
构建镜像
docker build -t shhnwangjian/python-ssh .
案例5：基于案例4的python-ssh镜像，构建app应用服务镜像
mkdir -p /root/docker/app/web-app
cd /root/docker/app/web-app
应用程序文件app.py
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)
python依赖包文件requirements.txt
Flask
supervisor配置文件app-supervisor.ini
[program:web-api]
command=/usr/bin/python2.7 /opt/app.py
process_name=%(program_name)s
autostart=true
user=www
stdout_logfile=/tmp/app.log
stderr_logfile=/tmp/app.error [program:sshd]
command=/usr/sbin/sshd -D
process_name=%(program_name)s
autostart=true
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
; Sample supervisor config file. [unix_http_server]
file=/var/run/supervisor/supervisor.sock ; (the path to the socket file)
;chmod= ; sockef file mode (default )
;chown=nobody:nogroup ; socket file uid:gid owner
;username=user ; (default is no username (open server))
;password= ; (default is no password (open server)) ;[inet_http_server] ; inet (TCP) server disabled by default
;port=127.0.0.1: ; (ip_address:port specifier, *:port for all iface)
;username=user ; (default is no username (open server))
;password= ; (default is no password (open server)) [supervisord]
logfile=/var/log/supervisor/supervisord.log ; (main log file;default $CWD/supervisord.log)
logfile_maxbytes=50MB ; (max main logfile bytes b4 rotation;default 50MB)
logfile_backups= ; (num of main logfile rotation backups;default )
loglevel=info ; (log level;default info; others: debug,warn,trace)
pidfile=/var/run/supervisord.pid ; (supervisord pidfile;default supervisord.pid)
nodaemon=true ; (start in foreground if true;default false)
minfds= ; (min. avail startup file descriptors;default )
minprocs= ; (min. avail process descriptors;default )
;umask= ; (process file creation umask;default )
;user=chrism ; (default is current user, required if root)
;identifier=supervisor ; (supervisord identifier, default is 'supervisor')
;directory=/tmp ; (default is not to cd during start)
;nocleanup=true ; (don't clean up tempfiles at start;default false)
;childlogdir=/tmp ; ('AUTO' child log dir, default $TEMP)
;environment=KEY=value ; (key value pairs to add to environment)
;strip_ansi=false ; (strip ansi escape codes in logs; def. false) ; the below section must remain in the config file for RPC
; (supervisorctl/web interface) to work, additional interfaces may be
; added by defining them in separate rpcinterface: sections
[rpcinterface:supervisor]
supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface [supervisorctl]
serverurl=unix:///var/run/supervisor/supervisor.sock ; use a unix:// URL for a unix socket
;serverurl=http://127.0.0.1:9001 ; use an http:// url to specify an inet socket
;username=chris ; should be same as http_username if set
;password= ; should be same as http_password if set
;prompt=mysupervisor ; cmd line prompt (default "supervisor")
;history_file=~/.sc_history ; use readline history if available ; The below sample program section shows all possible program subsection values,
; create one or more 'real' program: sections to be able to control them under
; supervisor. ;[program:theprogramname]
;command=/bin/cat ; the program (relative uses PATH, can take args)
;process_name=%(program_name)s ; process_name expr (default %(program_name)s)
;numprocs= ; number of processes copies to start (def )
;directory=/tmp ; directory to cwd to before exec (def no cwd)
;umask= ; umask for process (default None)
;priority= ; the relative start priority (default )
;autostart=true ; start at supervisord start (default: true)
;autorestart=true ; retstart at unexpected quit (default: true)
;startsecs= ; number of secs prog must stay running (def. )
;startretries= ; max # of serial start failures (default )
;exitcodes=, ; 'expected' exit codes for process (default ,)
;stopsignal=QUIT ; signal used to kill process (default TERM)
;stopwaitsecs= ; max num secs to wait b4 SIGKILL (default )
;user=chrism ; setuid to this UNIX account to run the program
;redirect_stderr=true ; redirect proc stderr to stdout (default false)
;stdout_logfile=/a/path ; stdout log path, NONE for none; default AUTO
;stdout_logfile_maxbytes=1MB ; max # logfile bytes b4 rotation (default 50MB)
;stdout_logfile_backups= ; # of stdout logfile backups (default )
;stdout_capture_maxbytes=1MB ; number of bytes in 'capturemode' (default )
;stdout_events_enabled=false ; emit events on stdout writes (default false)
;stderr_logfile=/a/path ; stderr log path, NONE for none; default AUTO
;stderr_logfile_maxbytes=1MB ; max # logfile bytes b4 rotation (default 50MB)
;stderr_logfile_backups= ; # of stderr logfile backups (default )
;stderr_capture_maxbytes=1MB ; number of bytes in 'capturemode' (default )
;stderr_events_enabled=false ; emit events on stderr writes (default false)
;environment=A=,B= ; process environment additions (def no adds)
;serverurl=AUTO ; override serverurl computation (childutils) ; The below sample eventlistener section shows all possible
; eventlistener subsection values, create one or more 'real'
; eventlistener: sections to be able to handle event notifications
; sent by supervisor. ;[eventlistener:theeventlistenername]
;command=/bin/eventlistener ; the program (relative uses PATH, can take args)
;process_name=%(program_name)s ; process_name expr (default %(program_name)s)
;numprocs= ; number of processes copies to start (def )
;events=EVENT ; event notif. types to subscribe to (req'd)
;buffer_size= ; event buffer queue size (default )
;directory=/tmp ; directory to cwd to before exec (def no cwd)
;umask= ; umask for process (default None)
;priority=- ; the relative start priority (default -)
;autostart=true ; start at supervisord start (default: true)
;autorestart=unexpected ; restart at unexpected quit (default: unexpected)
;startsecs= ; number of secs prog must stay running (def. )
;startretries= ; max # of serial start failures (default )
;exitcodes=, ; 'expected' exit codes for process (default ,)
;stopsignal=QUIT ; signal used to kill process (default TERM)
;stopwaitsecs= ; max num secs to wait b4 SIGKILL (default )
;user=chrism ; setuid to this UNIX account to run the program
;redirect_stderr=true ; redirect proc stderr to stdout (default false)
;stdout_logfile=/a/path ; stdout log path, NONE for none; default AUTO
;stdout_logfile_maxbytes=1MB ; max # logfile bytes b4 rotation (default 50MB)
;stdout_logfile_backups= ; # of stdout logfile backups (default )
;stdout_events_enabled=false ; emit events on stdout writes (default false)
;stderr_logfile=/a/path ; stderr log path, NONE for none; default AUTO
;stderr_logfile_maxbytes=1MB ; max # logfile bytes b4 rotation (default 50MB)
;stderr_logfile_backups ; # of stderr logfile backups (default )
;stderr_events_enabled=false ; emit events on stderr writes (default false)
;environment=A=,B= ; process environment additions
;serverurl=AUTO ; override serverurl computation (childutils) ; The below sample group section shows all possible group values,
; create one or more 'real' group: sections to create "heterogeneous"
; process groups. ;[group:thegroupname]
;programs=progname1,progname2 ; each refers to 'x' in [program:x] definitions
;priority= ; the relative start priority (default ) ; The [include] section can just contain the "files" setting. This
; setting can list multiple files (separated by whitespace or
; newlines). It can also contain wildcards. The filenames are
; interpreted as relative to this file. Included files *cannot*
; include files themselves. [include]
files = supervisord.d/*.ini
conf
备注：nodaemon=true ，前台启动
创建镜像文件
# Base image
FROM shhnwangjian/python-ssh # Who
MAINTAINER shhnwangjian xxx@163.com # ADD user www
RUN useradd -s /sbin/nologin -M www # ADD file
ADD app.py /opt/app.py
ADD requirements.txt /opt/
ADD supervisord.conf /etc/supervisord.conf
ADD app-supervisor.ini /etc/supervisord.d/ # Pip install
RUN /usr/bin/pip2.7 install -r /opt/requirements.txt # Port
EXPOSE 22 5000 # CMD
CMD ["/usr/bin/supervisord", "-c", "/etc/supervisord.conf"]
构建镜像
docker build -t shhnwangjian/web-api .
启动容器
docker run --name web-api -d -p 88:5000 -p 8022:22 shhnwangjian/web-api
