docker 自制CentOS 6-lnp镜像

环境准备

1台centos 6.5镜像虚拟机  febootstrap、docker

febootstrap 安装

yum install -y yum-priorities && rpm -ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm && rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6 

yum -y install febootstrap

docker 安装

yum -y install docker-io
service docker start

使用root账号制作镜像，普通用户制作后会有各种问题：

febootstrap -i bash -i wget -i yum -i iputils -i iproute -i man -i vim -i openssh-server -i openssh-clients -i tar -i gzip centos6 centos6-image http://mirrors.aliyun.com/centos/6/os/x86_64/  
(-i 安装package， centos6 操作系统版本，centos6-doc安装目录，最后是源地址)

执行完成后 你当前目录会生成centos6-image 目录

cd centos6-image
cp etc/skel/.bash* root/ (不拷贝，登录后Linux提示行会显示 bash-41#，而不是我们正常看到的[root@localhost ~]#)
tar -c .|docker import - centos6-base (centos6-base 为docker 镜像名称)

查看镜像

docker images
REPOSITORY            TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
centos6-base          latest              8f94e0bebd19        6 hours ago         399.4 MB

启动进入镜像

[root@192-168-0-151 build]# docker run  -itd 8f94e0bebd19 bash
2e943abb130a32830dd8580ab9345dd514b7b39597559cd08a790a8754ef56f1
[root@192-168-0-151 build]# docker exec -it 84f48b314bfa bash
[root@2e943abb130a /]#

进入镜像后，你可以安装自己的应用，我这里安装的是php 和nginx

我在/etc/init.d/ 下加入了nginx 和php-fpm 的启停脚本（可以省略）

容器里应用开机启动

容器下面多个应用启动的方法有很多种，比如supervisord、shell脚本等

我这里用的是shell 脚本的方法

mkdir /usr/local/scripts

[root@2e943abb130a scripts]# cat init-bashrc.sh
#!/bin/sh

function service_start()
{
    for SERVICE in nginx php-fpm sshd
    do
      if ! (ps ax | grep -v grep | grep $SERVICE > /dev/null)
      then
         /etc/init.d/$SERVICE start;
      fi
    done
}

service_start

编辑   ~/.bashrc

[root@2e943abb130a scripts]# cat  ~/.bashrc
# .bashrc

# Source global definitions
if [ -f /etc/bashrc ]; then
        . /etc/bashrc
fi

alias rm='rm -i'
alias cp='cp -i'
alias mv='mv -i'
alias ll='ls -l'
alias vi='vim'

/usr/local/scripts/init-bashrc.sh
# User specific aliases and functions

记得source  ~/.bashrc

退出容器 ctrl +d

提交容器为新的镜像

docker commit 2e943abb130a centos6-nginx-php56:v1
d85f477d9e00d12c380ebc442d544e0d8c9dd8ee86441e0885bb54f636c18ec1

提交成功后，docker images 会发现多出一个镜像

启动新镜像

[root@192-168-0-151 build]# docker run -it centos6-nginx-php56:v1

Starting nginx:                                            [  OK  ]
Starting php-fpm:                                          [  OK  ]
Starting sshd:                                             [  OK  ]
[root@36abc5805a89 /]# 

你还可以启动时暴漏端口，修改root 密码等

这里我们可以用Dockerfile 来做，下面只是个示例，关于Dockerfile 这里就不说明了。

cat Dockerfile

FROM centos6-nginx-php56:v1
MAINTAINER Tempted
RUN sed -i 's/UsePAM yes/UsePAM no/g' /etc/ssh/sshd_config
RUN echo "root:123456" | chpasswd
EXPOSE 22 80
CMD ["bash"]

build 新的镜像

[root@192-168-0-151 build]# docker  build -t centos6-lnp:v1 .
Sending build context to Docker daemon 15.87 kB
Sending build context to Docker daemon
Step 0 : FROM centos6-nginx-php56:v1
 ---> d85f477d9e00
Step 1 : MAINTAINER Tempted
 ---> Running in 46ec3f0fab12
 ---> 4ed3d31476d0
Removing intermediate container 46ec3f0fab12
Step 2 : RUN sed -i 's/UsePAM yes/UsePAM no/g' /etc/ssh/sshd_config
 ---> Running in 48ece83ad435
 ---> c02f08cf9b19
Removing intermediate container 48ece83ad435
Step 3 : RUN echo "root:123456" | chpasswd
 ---> Running in 22d1086800ca
 ---> 18db13e52113
Removing intermediate container 22d1086800ca
Step 4 : EXPOSE 22 80
 ---> Running in 8a65e01a0e84
 ---> 63a5bd61ba88
Removing intermediate container 8a65e01a0e84
Step 5 : CMD bash
 ---> Running in 671572d70abf
 ---> d0c9c51584ee
Removing intermediate container 671572d70abf
Successfully built d0c9c51584ee

这时你执行docker images 会看到三个image

启动新的镜像

[root@192-168-0-151 build]# docker run -itd d0c9c51584ee bash
bc10a9e77a8c8b9eb12a7da16d6513ffa11a686d29dc86e050e702fac96a6109
[root@192-168-0-151 build]# docker ps
CONTAINER ID        IMAGE               COMMAND                CREATED             STATUS              PORTS               NAMES
bc10a9e77a8c        d0c9c51584ee        "bash"                 20 seconds ago      Up 17 seconds       22/tcp, 80/tcp      cocky_morse 

[root@192-168-0-151 build]# docker  exec -it bc10a9e77a8c ifconfig
eth0      Link encap:Ethernet  HWaddr 02:42:AC:11:00:51
          inet addr:172.17.0.81  Bcast:0.0.0.0  Mask:255.255.0.0
          inet6 addr: fe80::42:acff:fe11:51/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:41 errors:0 dropped:0 overruns:0 frame:0
          TX packets:38 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:5060 (4.9 KiB)  TX bytes:5179 (5.0 KiB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

连接

[root@192-168-0-151 build]# ssh 172.17.0.81
root@172.17.0.81's password:
Last login: Fri Nov  3 17:23:16 2017 from 172.17.42.1
[root@bc10a9e77a8c ~]# 

导出镜像

docker  save centos6-lnp:v1 >centos6-lnp.tar