因为目前1.8以上的docker最低要求是3.10的Linux内核，而我的内核版本远低于此。
1 [root@localhost home]# uname -r 2 2.6.32-754.11.1.el6.x86_64
鉴于我的vm上有一堆的dependency，并且没有太多的时间来把内核升级，所以只能咬牙在redhat6的环境下装docker，先把不能把代码mount到另外一台ubuntu上跑unittest这个事情给解决了（这里我想吐槽管杀不管埋的IT一百遍）。
docker主要依赖于CE（社区版，一般已经很够用了），它的主要依赖包如下：（这个是1.7版本的，从网上看到的）
lxc-libs-1.0.9-1.el6.x86_64.rpm lua-alt-getopt-0.7.0-1.el6.noarch.rpm lua-filesystem-1.4.2-1.el6.x86_64.rpm lua-lxc-1.0.9-1.el6.x86_64.rpm lxc-1.0.9-1.el6.x86_64.rpm docker-io-1.7.1-2.el6.x86_64.rpm device-mapper-libs-1.02.117-12.el6.i686.rpm device-mapper-libs-1.02.117-12.el6.x86_64.rpm
但是我想用yum下载并安装，所以为了以防万一，我先装了个epel-release。EPEL (Extra Packages for Enterprise Linux)是基于Fedora的一个项目，为“红帽系”的操作系统提供额外的软件包，适用于RHEL、CentOS和Scientific Linux.
1 [root@localhost Downloads]# yum -y install epel-release
2 Loaded plugins: product-id, refresh-packagekit, security, subscription-manager
3 Updating certificate-based repositories.
4 Unable to read consumer identity
5 epel | 4.7 kB 00:00
6 itaas | 2.0 kB 00:00
7 itaas-extras | 1.8 kB 00:00
8 itaas-optional | 2.0 kB 00:00
9 itaas-supplementary | 2.0 kB 00:00
10 Setting up Install Process
11 Package epel-release-6-8.noarch already installed and latest version
12 Nothing to do
安装成功后，yum的源可以看到
1 [root@localhost Downloads]# yum repolist
2 Loaded plugins: product-id, refresh-packagekit, security, subscription-manager
3 Updating certificate-based repositories.
4 Unable to read consumer identity
5 repo id repo name status
6 epel Extra Packages for Enterprise Linux 6 - x86_64 12,503
7 itaas itaas 20,720
8 itaas-extras itaas extras yum repo 97
9 itaas-optional itaas optional yum repo 11,997
10 itaas-supplementary itaas supplementary yum repo 896 11 repolist: 46,213
查找docker相应的依赖包
1 [root@localhost etc]# yum search docker 2 Loaded plugins: product-id, refresh-packagekit, security, subscription-manager 3 Updating certificate-based repositories. 4 Unable to read consumer identity 5 ============================================================================================== N/S Matched: docker =============================================================================================== 6 docker-io-fish-completion.x86_64 : fish completion files for docker 7 docker-io-logrotate.x86_64 : cron job to run logrotate on docker containers 8 docker-io-vim.x86_64 : vim syntax highlighting files for docker 9 docker-io-zsh-completion.x86_64 : zsh completion files for docker 10 fedora-dockerfiles.x86_64 : Example dockerfiles to assist standing up containers quickly 11 golang-github-docker-libtrust-unit-test.x86_64 : Unit tests for golang-github-docker-libtrust package 12 golang-github-docker-spdystream-unit-test.x86_64 : Unit tests for golang-github-docker-spdystream package 13 golang-github-fsouza-go-dockerclient-devel.noarch : Client for the Docker remote API 14 golang-github-fsouza-go-dockerclient-unit-test.x86_64 : Unit tests for golang-github-fsouza-go-dockerclient package 15 imagefactory-plugins-Docker.noarch : Cloud plugin for Docker 16 python-docker-py.x86_64 : An API client for docker written in Python 17 python-docker-registry-core.noarch : Core package for docker-registry (drivers) developers 18 python-dockerfile-parse.noarch : Python library for Dockerfile manipulation 19 docker.x86_64 : KDE and GNOME2 system tray replacement docking application 20 docker-io.x86_64 : Automates deployment of containerized applications 21 docker-io-devel.x86_64 : A golang registry for global request variables (source libraries) 22 golang-github-docker-libcontainer.x86_64 : Configuration options for containers 23 golang-github-docker-libcontainer-devel.x86_64 : Configuration options for containers 24 golang-github-docker-libtrust-devel.noarch : Library for managing authentication and authorization 25 golang-github-docker-spdystream-devel.noarch : A multiplexed stream library using spdy 26 27 Name and summary matches only, use "search all" for everything.
安装docker必须的依赖包，以为有些依赖包之间也存在依赖关系，所以有些装完，被依赖的包也就顺便一起装了。
1 [root@localhost etc]# yum install -y docker 2 [root@localhost etc]# yum install -y lua-lxc.x86_64 3 [root@localhost etc]# yum install -y lxc.x86_64 4 [root@localhost8 etc]# yum install -y docker-io.x86_64 5 [root@localhost etc]# yum install -y device-mapper-libs.i686 6 [root@localhost etc]# yum install -y device-mapper-libs.x86_64
然后把docker的service打开，确认docker是否装上了
1 [root@localhost docker]# service docker start 2 Starting docker: [ OK ] 3 [root@localhost docker]# docker info
这里需要注意一下，因为是redhat6，所以只有service，没有systemctl。这里还关系到另外一个问题，就是尽量不要把docker的存储位置迁移。
目前网上所教的方法，有如下几种：
1. 是把/var/lib/docker整个路径下的文件都拷贝到其他位置，然后再软链接回来。
2.是把/var/lib/docker整个路径下的文件都拷贝到其他位置，然后修改docker.service，
- --graph=/data/docker：docker新的存储位置
- --storage-driver=overlay ： 当前docker所使用的存储驱动
虽然这俩方法都挺好的，但是redhat6的service写法于redhat7不同，并且我们这里装的docker版本比较低，软链接回来，有些路径依旧不对，docker pull会不起作用，并且明面上不会有报错。所以最好不迁移。