Centos7 docker容器 搭建

Dockerfile 文件如下：

#
# MAINTAINER        Carson,C.J.Zeong <zcy@nicescale.com>
# DOCKER-VERSION    1.6.
#
# Dockerizing CentOS7: Dockerfile for building CentOS images
#
#基础镜像来自：centos7
FROM       centos:centos7.1.1503
#维护者信息
MAINTAINER XXXXX <XXX@XXX.com>

#evn 是环境的意思
ENV TZ "Asia/Shanghai"
ENV TERM xterm

# Add和copy都是复制文件的命令，但是add比copy 好：add可支持连接地址同时对于压缩文件可以自动解压
ADD aliyun-mirror.repo /etc/yum.repos.d/CentOS-Base.repo
ADD aliyun-epel.repo /etc/yum.repos.d/epel.repo

#安装了基础的工具和软件
RUN yum install -y curl wget tar bzip2 unzip vim-enhanced passwd sudo yum-utils hostname net-tools rsync man && \
    yum install -y gcc gcc-c++ git make automake cmake patch logrotate python-devel libpng-devel libjpeg-devel && \
    yum install -y --enablerepo=epel pwgen python-pip && \
    yum clean all

#使用pip安装进程管理工具
RUN pip install supervisor
#复制本地文件到镜像机器的相应目录
ADD supervisord.conf /etc/supervisord.conf

#创建需要用到的其他目录，这里是启动其他文件的配置文件和日志文件
RUN mkdir -p /etc/supervisor.conf.d && \
    mkdir -p /var/log/supervisor

#暴露22端口
EXPOSE 

#只有最后ENTRYPOINT一条生效
ENTRYPOINT ["/usr/bin/supervisord", "-n", "-c", "/etc/supervisord.conf"]

同时在和Dockerfile 文件的同级目录下有如下文件：

aliyun-mirror.repo文件

# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client. You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
#
#

[base]
name=CentOS-$releasever - Base - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/os/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

#released updates
[updates]
name=CentOS-$releasever - Updates - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/updates/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/extras/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/centosplus/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus
gpgcheck=1
enabled=0
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

#contrib - packages by Centos Users
[contrib]
name=CentOS-$releasever - Contrib - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/contrib/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib
gpgcheck=1
enabled=0
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

aliyun-epel.repo文件

[epel]
name=Extra Packages for Enterprise Linux  - $basearch
baseurl=http://mirrors.aliyun.com/epel/7/$basearch
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=$basearch
failovermethod=priority
enabled=
gpgcheck=
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7

[epel-debuginfo]
name=Extra Packages for Enterprise Linux  - $basearch - Debug
baseurl=http://mirrors.aliyun.com/epel/7/$basearch/debug
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-debug-7&arch=$basearch
failovermethod=priority
enabled=
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
gpgcheck=

[epel-source]
name=Extra Packages for Enterprise Linux  - $basearch - Source
baseurl=http://mirrors.aliyun.com/epel/7/SRPMS
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-source-7&arch=$basearch
failovermethod=priority
enabled=
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
gpgcheck=

supervisord.conf文件

[unix_http_server]
file=/var/run/supervisor.sock ; (the path to the socket file)
chmod=              ; socket file mode (default )

[supervisord]
logfile=/var/log/supervisor/supervisord.log ; (main log file;default $CWD/supervisord.log)
logfile_maxbytes=50MB
logfile_backup=
loglevel=info
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 )

[rpcinterface:supervisor]
supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface

[supervisorctl]
serverurl=unix:///var/run/supervisor.sock ; use a unix:// URL  for a unix socket

[include]
files = /etc/supervisor.conf.d/*.conf

开始build镜像：

命令的最后的点表示当前目录，正如你所看的（ls 命令查看），当前目录下有Dockerfile 文件 这里只用点（.） 就可以了，不然要用正确的路径。

上图也就是docker的第一层（step1）操作。

后面的操作类似都会根据Dockerfile配置的执行。

然后查看docker镜像，这里已经有了。

然后运行容器，docker run：

-d 表示后台运行（把容器的长id返回），-p 表示端口映射， --name 表示该容器的别名，，最后返回容器的id号。（-P(大写)的话宿主机会随机给一个端口与改容器需要使用的端口（这里是22）做映射。）

查看容器（加 -a 表示查看全部）：

基础镜像已经完成。