创建原生的docker镜像

说明：根据youtube视屏学习，视屏网址：https://www.youtube.com/watch?v=s948NKa1I1I&noredirect=1

1、在虚拟机上安装minimal版本的系统（centos6.5）虚拟机网络保证是NAT模式，这样可以能使用在线yum源

2、配置虚拟机网络环境：

[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0

ONBOOT=yes

NM_CONTROLLED=yes

BOOTPROTO=dhcp

------------------------------------------------------------

ifup eth0

yum install vim  #测试yum是否可用，vim安装后方便后期脚本编辑

3、安装epel-release rpm包，下面网址中提供各种操作系统的包

http://www.tecmint.com/how-to-enable-epel-repository-for-rhel-centos-6-5/

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# wget http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
# rpm -ivh epel-release-6-8.noarch.rpm
4、修改/etc/yum.repos.d/CentOS-Base.repo

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#additional packages that extend functionality of existing packages

[centosplus]

name=CentOS-$releasever - Plus

mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus

#baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/

gpgcheck=1

enabled=1

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6

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yum update -y #软件升级，主要是内核过低会导致高版本的docker无法启动

 yum install docker-io #安装docker，这里的版本是1.7.1

:%s/$releasever/6/g

:%s/$basearch/x86_64/g



5、在/root/下面

mkdir scripts

touch mkimage-yum.sh

拷贝https://github.com/docker/docker/blob/master/contrib/mkimage-yum.sh

内容到脚本中

chmod +x  mkimage-yum.sh

./mkimage_yum.sh centos6.8image

[root@localhost scripts]# docker images

REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE

centos6.8image      6.8                 ec9c8e39b9c6        26 seconds ago      183.2 MB

导出镜像：

[root@localhost scripts]# docker save ec9c8e39b9c6 > ./centos6.8base.tar

本地加载：

docker load < /home/paradigm/project/docker_note/images/centos6.8base.tar

镜像打标：

docker tag 4218ea8f4b45 4paradigm/centos:6.8