在redhat6上装1.8以下的docker

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。

 [root@localhost home]# uname -r
 2.6.-754.11..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.-.el6.x86_64.rpm
lua-alt-getopt-0.7.-.el6.noarch.rpm
lua-filesystem-1.4.-.el6.x86_64.rpm
lua-lxc-1.0.-.el6.x86_64.rpm
lxc-1.0.-.el6.x86_64.rpm
docker-io-1.7.-.el6.x86_64.rpm

device-mapper-libs-1.02.-.el6.i686.rpm
device-mapper-libs-1.02.-.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.

 [root@localhost Downloads]# yum -y install epel-release 
 Loaded plugins: product-id, refresh-packagekit, security, subscription-manager 
 Updating certificate-based repositories. 
 Unable to read consumer identity  
 5 epel | 4.7 kB : 
 itaas | 2.0 kB : 
 itaas-extras | 1.8 kB : 
 itaas-optional | 2.0 kB : 
 itaas-supplementary | 2.0 kB :00
  Setting up Install Process
  Package epel-release--.noarch already installed and latest version
  Nothing to do

安装成功后，yum的源可以看到

 [root@localhost Downloads]# yum repolist  
 2 Loaded plugins: product-id, refresh-packagekit, security, subscription-manager  
 3 Updating certificate-based repositories.
 Unable to read consumer identity 
 repo id repo name status 
 epel Extra Packages for Enterprise Linux  - x86_64 , 
 itaas itaas , 
 itaas-extras itaas extras yum repo  
 itaas-optional itaas optional yum repo ,997
  itaas-supplementary itaas supplementary yum repo   repolist: ,

查找docker相应的依赖包

 [root@localhost etc]# yum search docker
 Loaded plugins: product-id, refresh-packagekit, security, subscription-manager
 Updating certificate-based repositories.
 Unable to read consumer identity
 ============================================================================================== N/S Matched: docker ===============================================================================================
 docker-io-fish-completion.x86_64 : fish completion files for docker
 docker-io-logrotate.x86_64 : cron job to run logrotate on docker containers
 docker-io-vim.x86_64 : vim syntax highlighting files for docker
 docker-io-zsh-completion.x86_64 : zsh completion files for docker
 fedora-dockerfiles.x86_64 : Example dockerfiles to assist standing up containers quickly
 golang-github-docker-libtrust-unit-test.x86_64 : Unit tests for golang-github-docker-libtrust package
 golang-github-docker-spdystream-unit-test.x86_64 : Unit tests for golang-github-docker-spdystream package
 golang-github-fsouza-go-dockerclient-devel.noarch : Client for the Docker remote API
 golang-github-fsouza-go-dockerclient-unit-test.x86_64 : Unit tests for golang-github-fsouza-go-dockerclient package
 imagefactory-plugins-Docker.noarch : Cloud plugin for Docker
 python-docker-py.x86_64 : An API client for docker written in Python
 python-docker-registry-core.noarch : Core package for docker-registry (drivers) developers
 python-dockerfile-parse.noarch : Python library for Dockerfile manipulation
 docker.x86_64 : KDE and GNOME2 system tray replacement docking application
 docker-io.x86_64 : Automates deployment of containerized applications
 docker-io-devel.x86_64 : A golang registry for global request variables (source libraries)
 golang-github-docker-libcontainer.x86_64 : Configuration options for containers
 golang-github-docker-libcontainer-devel.x86_64 : Configuration options for containers
 golang-github-docker-libtrust-devel.noarch : Library for managing authentication and authorization
 golang-github-docker-spdystream-devel.noarch : A multiplexed stream library using spdy

   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。

 [root@localhost etc]# yum install -y docker
 [root@localhost etc]# yum install -y lua-lxc.x86_64
 [root@localhost etc]# yum install -y lxc.x86_64
 [root@localhost8 etc]# yum install -y docker-io.x86_64
 [root@localhost etc]# yum install -y device-mapper-libs.i686
 [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

 [root@localhost docker]# service docker start
 Starting docker:                                       [  OK  ]
 [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。