參考資料：
1. 開源中國 http://www.oschina.net/translate/nstalling-dockerio-on-centos-64-64-bit?cmp
Docker 是一個開源的應用容器引擎，讓開發者可以打包他們的應用以及依賴包到一個可移植的容器中，然后發布到任何流行的 Linux 機器上，也可以實現虛擬化。容器是完全使用沙箱機制，相互之間不會有任何接口。
1 Docker與虛擬機
2 搭建過程
2.1 准備宿主系統
准備一個 CentOS 7操作系統，具體要求如下：
必須是 64 位操作系統
建議內核在 3.8 以上
通過以下命令查看您的 CentOS 內核：
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# uname -r
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2.2 安裝Docker
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# yum install docker
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可使用以下命令，查看 Docker 是否安裝成功：
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# docker version
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若輸出了 Docker 的版本號，則說明安裝成功了，可通過以下命令啟動 Docker 服務：
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# systemctl start docker.service
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一旦 Docker 服務啟動完畢，就可以開始使用 Docker 了。
yum安裝時出現：Cannot retrieve metalink for repository: epel. Please verify its path and try again
在CentOS 6.3 x86_64下安裝php-mcrypt的時候出現了問題：Error: Cannot retrieve metalink for repository: epel. Please verify its path and try again，需要安裝epel源。
解決方法： 一句話：把vi /etc/yum.repos.d/epel.repo，文件第3行注釋去掉，把第四行注釋掉。具體如下：將第六行的disabled改成為0 即disabled=1改成disabled=0
打開/etc/yum.repos.d/epel.repo，將
- [epel]
- name=Extra Packages for Enterprise Linux 6 - $basearch
- #baseurl=http://download.fedoraproject.org/pub/epel/6/$basearch
- mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-6&arch=$basearch
修改為
- [epel]
- name=Extra Packages for Enterprise Linux 6 - $basearch
- baseurl=http://download.fedoraproject.org/pub/epel/6/$basearch
- #mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-6&arch=$basearch
再清理源，重新安裝
- yum clean all
- yum install -y 需要的包
如果還是不行，修改DNS,到/etc/resolv.conf下添加一下：
nameserver 8.8.8.8
search localdomain
然后重啟network服務：service network restart
最近在群里聽說Docker很火，於是自己抱着試試的態度，想玩玩，可是遇到了一些問題，記錄下來，方便備忘，也方便防止大家被坑。
我的虛擬機裝的是centos 6.5,百度了好多教程，丫的，都不解釋，就一句命令：yum install docker-io,這句話是用源安裝docker,可是源一般是國外源，用這個命令因為GFW被牆，根本安裝不了。
- [root@localhost ~]# yum install docker-io
- Loaded plugins: fastestmirror, refresh-packagekit, security
- Loading mirror speeds from cached hostfile
- * base: mirrors.skyshe.cn
- * extras: mirrors.skyshe.cn
- * updates: centosx4.centos.org
- Setting up Install Process
- No package docker-io available.
- Error: Nothing to do
- <pre name="code" class="plain">[root@localhost ~]# yum install docker
- Loaded plugins: fastestmirror, refresh-packagekit, security
- Loading mirror speeds from cached hostfile
- * base: mirrors.163.com
- * extras: mirrors.skyshe.cn
- * updates: centosx4.centos.org
- Setting up Install Process
- No package docker available.
- Error: Nothing to do
總共嘗試了好幾次，所謂的鏡像很不穩定，不是沒有找到，就是找到了，下了一半就中途斷了，哎，網上總是說一句話搞定，可是一句話搞定要有前提呀，於是乎，我看了開源中國的docker更新記錄
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Ubuntu/Debian: curl -sSL https://get.docker.com | sh
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Linux 64bit binary: https://get.docker.com/builds/Linux/x86_64/docker-1.7.1
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Darwin/OSX 64bit client binary: https://get.docker.com/builds/Darwin/x86_64/docker-1.7.1
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Darwin/OSX 32bit client binary: https://get.docker.com/builds/Darwin/i386/docker-1.7.1
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Linux 64bit tgz: https://get.docker.com/builds/Linux/x86_64/docker-1.7.1.tgz
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Windows 64bit client binary: https://get.docker.com/builds/Windows/x86_64/docker-1.7.1.exe
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Windows 32bit client binary: https://get.docker.com/builds/Windows/i386/docker-1.7.1.exe
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Centos 6/RHEL 6: https://get.docker.com/rpm/1.7.1/centos-6/RPMS/x86_64/docker-engine-1.7.1-1.el6.x86_64.rpm
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Centos 7/RHEL 7: https://get.docker.com/rpm/1.7.1/centos-7/RPMS/x86_64/docker-engine-1.7.1-1.el7.centos.x86_64.rpm
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Fedora 20: https://get.docker.com/rpm/1.7.1/fedora-20/RPMS/x86_64/docker-engine-1.7.1-1.fc20.x86_64.rpm
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Fedora 21: https://get.docker.com/rpm/1.7.1/fedora-21/RPMS/x86_64/docker-engine-1.7.1-1.fc21.x86_64.rpm
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Fedora 22: https://get.docker.com/rpm/1.7.1/fedora-22/RPMS/x86_64/docker-engine-1.7.1-1.fc22.x86_64.rpm
啥也不說成功了，
- [root@localhost ~]# yum install https://get.docker.com/rpm/1.7.1/centos-6/RPMS/x86_64/docker-engine-1.7.1-1.el6.x86_64.rpm
- Loaded plugins: fastestmirror, refresh-packagekit, security
- Loading mirror speeds from cached hostfile
- * base: mirrors.163.com
- * extras: mirrors.skyshe.cn
- * updates: centosx4.centos.org
- Setting up Install Process
- docker-engine-1.7.1-1.el6.x86_64.rpm | 4.5 MB 00:07
- Examining /var/tmp/yum-root-YSfgzS/docker-engine-1.7.1-1.el6.x86_64.rpm: docker-engine-1.7.1-1.el6.x86_64
- Marking /var/tmp/yum-root-YSfgzS/docker-engine-1.7.1-1.el6.x86_64.rpm to be installed
- Resolving Dependencies
- --> Running transaction check
- ---> Package docker-engine.x86_64 0:1.7.1-1.el6 will be installed
- --> Processing Dependency: libcgroup for package: docker-engine-1.7.1-1.el6.x86_64
- --> Running transaction check
- ---> Package libcgroup.x86_64 0:0.40.rc1-16.el6 will be installed
- --> Finished Dependency Resolution
- Dependencies Resolved
- ============================================================================================================================================================
- Package Arch Version Repository Size
- ============================================================================================================================================================
- Installing:
- docker-engine x86_64 1.7.1-1.el6 /docker-engine-1.7.1-1.el6.x86_64 19 M
- Installing for dependencies:
- libcgroup x86_64 0.40.rc1-16.el6 base 129 k
- Transaction Summary
- ============================================================================================================================================================
- Install 2 Package(s)
- Total size: 19 M
- Total download size: 129 k
- Installed size: 20 M
- Is this ok [y/N]: y
- Downloading Packages:
- libcgroup-0.40.rc1-16.el6.x86_64.rpm | 129 kB 00:00
- Running rpm_check_debug
- Running Transaction Test
- Transaction Test Succeeded
- Running Transaction
- Installing : libcgroup-0.40.rc1-16.el6.x86_64 1/2
- Installing : docker-engine-1.7.1-1.el6.x86_64 2/2
- Verifying : libcgroup-0.40.rc1-16.el6.x86_64 1/2
- Verifying : docker-engine-1.7.1-1.el6.x86_64 2/2
- Installed:
- docker-engine.x86_64 0:1.7.1-1.el6
- Dependency Installed:
- libcgroup.x86_64 0:0.40.rc1-16.el6
- Complete!
- [root@localhost ~]# service docker start
- Starting cgconfig service: [ OK ]
- Starting docker: [ OK ]
下面就開始玩玩docker了，以后慢慢分享
其他的大家可以看看：http://www.linuxidc.com/Linux/2014-07/104768.htm
https://linux.cn/article-4340-1.html
http://www.centoscn.com/image-text/config/2015/0718/5877.html