ubuntu14.04 server版 安装指定版本docker的方法（解决apt-get install无法安装指定版本docker的问题）
因为之前一直使用的是centos6.x系统，因为公司考虑转用docker代替VMware的ESXI，所以就开始了我的docker折腾之旅。 在安装Ubuntu之前我已经用centos6.7+升级内核的办法使用了一段时间docker1.7.1版本，后面装了一个cSphere的docker集群管理工具，发现docker1.7.1版本有很大的漏洞，因为官网的docker对Ubuntu的支持比较好，而且内核也比较新，所以决定转用。然后就有了昨天的U盘安装Ubuntu的文字记录。废话少说，今天的坑是装好了系统，配置了好多次手动指定IP，但是就是上不了外网，但是自动获取可以，反复折腾了好多次，最后是我同事随便查看了一下，什么也没改动就可以ping通外网了。有时候不得不说，这是命！
连上网络开始用apt-get update更新包管理器然后apt-get install docker 安装发现是比较低的版本，
然后改用官方的脚本安装：
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$ wget -qO- https://get.docker.com/ | sh
可能是因为网络的关系，一直卡在下载的地方，过不去。所以找了其他网上朋友的方法，实测可行
操作如下：
这边记录ubuntu安装过程，首先是官网文档
[*]If you haven’t already done so, log into your Ubuntu instance.
[*]Open a terminal window.
[*]Add the new gpg key.$ apt-key adv --keyserver hkp://pgp.mit.edu:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
[*]Open the /etc/apt/sources.list.d/docker.list file in your favorite editor.If the file doesn’t exist, create it.
[*]Remove any existing entries.
[*]Add an entry for your Ubuntu operating system.The possible entries are:# Ubuntu Precisedeb https://apt.dockerproject.org/repo ubuntu-precise main# Ubuntu Trustydeb https://apt.dockerproject.org/repo ubuntu-trusty main# Ubuntu Vividdeb https://apt.dockerproject.org/repo ubuntu-vivid main# Ubuntu Wilydeb https://apt.dockerproject.org/repo ubuntu-wily main
[*]Save and close the /etc/apt/sources.list.d/docker.list file.
[*]Update the apt package index.$ apt-get update
[*]Purge the old repo if it exists.$ apt-get purge lxc-docker*
[*]Verify that apt is pulling from the right repository.$ apt-cache policy docker-engine
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root@ubuntu:/etc/apt/sources.list.d# apt-cache policy docker-engine
docker-engine:
Installed: (none)
Candidate: 1.10.1-0~wily
Version table:
1.10.1-0~wily 0
500 https://apt.dockerproject.org/repo/ ubuntu-wily/main amd64 Packages
1.10.1-0~trusty 0
500 https://apt.dockerproject.org/repo/ ubuntu-trusty/main amd64 Packages
1.10.1-0~precise 0
500 https://apt.dockerproject.org/repo/ ubuntu-precise/main amd64 Packages
1.10.0-0~wily 0
500 https://apt.dockerproject.org/repo/ ubuntu-wily/main amd64 Packages
1.10.0-0~trusty 0
500 https://apt.dockerproject.org/repo/ ubuntu-trusty/main amd64 Packages
1.10.0-0~precise 0
500 https://apt.dockerproject.org/repo/ ubuntu-precise/main amd64 Packages
1.9.1-0~wily 0
500 https://apt.dockerproject.org/repo/ ubuntu-wily/main amd64 Packages
1.9.1-0~vivid 0
500 https://apt.dockerproject.org/repo/ ubuntu-vivid/main amd64 Packages
1.9.1-0~trusty 0
500 https://apt.dockerproject.org/repo/ ubuntu-trusty/main amd64 Packages
1.9.1-0~precise 0
500 https://apt.dockerproject.org/repo/ ubuntu-precise/main amd64 Packages
1.9.0-0~wily 0
500 https://apt.dockerproject.org/repo/ ubuntu-wily/main amd64 Packages
1.9.0-0~vivid 0
500 https://apt.dockerproject.org/repo/ ubuntu-vivid/main amd64 Packages
1.9.0-0~trusty 0
500 https://apt.dockerproject.org/repo/ ubuntu-trusty/main amd64 Packages
1.9.0-0~precise 0
500 https://apt.dockerproject.org/repo/ ubuntu-precise/main amd64 Packages
1.8.3-0~wily 0
500 https://apt.dockerproject.org/repo/ ubuntu-wily/main amd64 Packages
1.8.3-0~vivid 0
500 https://apt.dockerproject.org/repo/ ubuntu-vivid/main amd64 Packages
1.8.3-0~trusty 0
500 https://apt.dockerproject.org/repo/ ubuntu-trusty/main amd64 Packages
1.8.3-0~precise 0
500 https://apt.dockerproject.org/repo/ ubuntu-precise/main amd64 Packages
1.8.2-0~wily 0
500 https://apt.dockerproject.org/repo/ ubuntu-wily/main amd64 Packages
1.8.2-0~vivid 0
500 https://apt.dockerproject.org/repo/ ubuntu-vivid/main amd64 Packages
1.8.2-0~trusty 0
500 https://apt.dockerproject.org/repo/ ubuntu-trusty/main amd64 Packages
1.8.2-0~precise 0
500 https://apt.dockerproject.org/repo/ ubuntu-precise/main amd64 Packages
最后选择需要的版本安装即可。命令如下：
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$ apt-get install -y docker-engine=1.10.1-0~trusty
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