Docker官網上針對Centos的的安裝需求如下:

Docker requires a 64-bit installation regardless of your CentOS version. Also, your kernel must be 3.10 at minimum, which CentOS 7 runs.

看來如果我們想在低於3.x核心的作業系統（比如Centos6.6）上裝Docker最新版，勢必要升級核心了。且不說升級核心步驟繁瑣、容易出錯，單就這種比較怪異的搭配：Centos6.x + Kerneol3.X + Docker1.11，就沒有人能夠保證其穩定性。故我的建議是設法在Centos6.6上安裝較低版本的

[[email protected] docker]# uname -a

Linux bogon 2.6.32-504.el6.x86_64 #1 SMP Wed Oct 15 04:27:16 UTC 2014 x86_64 x86_64 x86_64 GNU/linux

[[email protected] docker]# cat /etc/redhat-release

CentOS release 6.6 (Final)

[[email protected] docker]# docker

bash: docker: command not found

[[email protected] docker]# yum install docker

Loaded plugins: fastestmirror, refresh-packagekit, security
Setting up Install Process
Loading mirror speeds from cached hostfile
 * base: mirrors.tuna.tsinghua.edu.cn
 * epel: dl.fedoraproject.org
 * extras: mirrors.tuna.tsinghua.edu.cn
 * updates: mirrors.tuna.tsinghua.edu.cn
http://repos.fedorapeople.org/repos/peter/erlang/epel-6/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
Trying other mirror.
To address this issue please refer to the below knowledge base article

https://access.redhat.com/articles/1320623

If above article doesn't help to resolve this issue please open a ticket with Red Hat Support.

No package docker available.
Error: Nothing to do

[[email protected] docker]# yum install docker-io

Loaded plugins: fastestmirror, refresh-packagekit, security
Setting up Install Process
Loading mirror speeds from cached hostfile
 * base: mirrors.tuna.tsinghua.edu.cn
 * epel: pubmirror1.math.uh.edu
 * extras: mirrors.tuna.tsinghua.edu.cn
 * updates: mirrors.tuna.tsinghua.edu.cn
http://repos.fedorapeople.org/repos/peter/erlang/epel-6/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
Trying other mirror.
To address this issue please refer to the below knowledge base article

https://access.redhat.com/articles/1320623

If above article doesn't help to resolve this issue please open a ticket with Red Hat Support.

No package docker-io available.
Error: Nothing to do

可以看到，在Centos6.7的標準yum源中已經沒有Docker的安裝包了，這時，我們需要安裝EPEL。

EPEL（Extra Packages for Enterprise Linux），企業版Linux額外包，RHEL分佈非標準包的社群類庫。安裝如下：

[[email protected] docker]# rpm -iUvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm

Retrieving http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
warning: /var/tmp/rpm-tmp.em6i9i: Header V3 RSA/SHA256 Signature, key ID 0608b895: NOKEY
Preparing...                ########################################### [100%]
   1:epel-release           ########################################### [100%]

接下來安裝Docker1.7.1，在1.7.1中，安裝包名稱為docker-io，故我們的安裝命令如下：

[[email protected] docker]# yum install docker-io

Loaded plugins: fastestmirror, refresh-packagekit, security
Setting up Install Process
Loading mirror speeds from cached hostfile
epel/metalink                                                                                                                                                                                            | 7.1 kB     00:00     
 * base: mirrors.tuna.tsinghua.edu.cn
 * epel: mirrors.tuna.tsinghua.edu.cn
 * extras: mirrors.tuna.tsinghua.edu.cn
 * updates: mirrors.tuna.tsinghua.edu.cn
epel                                                                                                                                                                                                     | 4.3 kB     00:00     
epel/primary_db                                                                                                                                                                                          | 5.9 MB     00:13     
http://repos.fedorapeople.org/repos/peter/erlang/epel-6/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
Trying other mirror.
To address this issue please refer to the below knowledge base article

https://access.redhat.com/articles/1320623

If above article doesn't help to resolve this issue please open a ticket with Red Hat Support.

Resolving Dependencies
--> Running transaction check
---> Package docker-io.x86_64 0:1.7.1-2.el6 will be installed
--> Processing Dependency: lxc for package: docker-io-1.7.1-2.el6.x86_64
--> Processing Dependency: libcgroup for package: docker-io-1.7.1-2.el6.x86_64
--> Running transaction check
---> Package libcgroup.x86_64 0:0.40.rc1-23.el6 will be installed
---> Package lxc.x86_64 0:1.0.9-1.el6 will be installed
--> Processing Dependency: lua-lxc(x86-64) = 1.0.9-1.el6 for package: lxc-1.0.9-1.el6.x86_64
--> Processing Dependency: lua-alt-getopt for package: lxc-1.0.9-1.el6.x86_64
--> Processing Dependency: liblxc.so.1()(64bit) for package: lxc-1.0.9-1.el6.x86_64
--> Running transaction check
---> Package lua-alt-getopt.noarch 0:0.7.0-1.el6 will be installed
---> Package lua-lxc.x86_64 0:1.0.9-1.el6 will be installed
--> Processing Dependency: lua-filesystem for package: lua-lxc-1.0.9-1.el6.x86_64
---> Package lxc-libs.x86_64 0:1.0.9-1.el6 will be installed
--> Running transaction check
---> Package lua-filesystem.x86_64 0:1.4.2-1.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================================================================================================================================================================
 Package                                                   Arch                                              Version                                                      Repository                                       Size
================================================================================================================================================================================================================================
Installing:
 docker-io                                                 x86_64                                            1.7.1-2.el6                                                  epel                                            4.6 M
Installing for dependencies:
 libcgroup                                                 x86_64                                            0.40.rc1-23.el6                                              base                                            131 k
 lua-alt-getopt                                            noarch                                            0.7.0-1.el6                                                  epel                                            6.9 k
 lua-filesystem                                            x86_64                                            1.4.2-1.el6                                                  epel                                             24 k
 lua-lxc                                                   x86_64                                            1.0.9-1.el6                                                  epel                                             16 k
 lxc                                                       x86_64                                            1.0.9-1.el6                                                  epel                                            122 k
 lxc-libs                                                  x86_64                                            1.0.9-1.el6                                                  epel                                            257 k

Transaction Summary
================================================================================================================================================================================================================================
Install       7 Package(s)

Total download size: 5.1 M
Installed size: 20 M

Is this ok [y/N]: y

Downloading Packages:
(1/7): docker-io-1.7.1-2.el6.x86_64.rpm                                                                                                                                                                  | 4.6 MB     00:10     
(2/7): libcgroup-0.40.rc1-23.el6.x86_64.rpm                                                                                                                                                              | 131 kB     00:00     
(3/7): lua-alt-getopt-0.7.0-1.el6.noarch.rpm                                                                                                                                                             | 6.9 kB     00:00     
(4/7): lua-filesystem-1.4.2-1.el6.x86_64.rpm                                                                                                                                                             |  24 kB     00:00     
(5/7): lua-lxc-1.0.9-1.el6.x86_64.rpm                                                                                                                                                                    |  16 kB     00:00     
(6/7): lxc-1.0.9-1.el6.x86_64.rpm                                                                                                                                                                        | 122 kB     00:00     
(7/7): lxc-libs-1.0.9-1.el6.x86_64.rpm                                                                                                                                                                   | 257 kB     00:00     
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total                                                                                                                                                                                           457 kB/s | 5.1 MB     00:11     
warning: rpmts_HdrFromFdno: Header V3 RSA/SHA256 Signature, key ID 0608b895: NOKEY
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
Importing GPG key 0x0608B895:
 Userid : EPEL (6) <[email protected]>
 Package: epel-release-6-8.noarch (installed)
 From   : /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6

Is this ok [y/N]: y

Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Warning: RPMDB altered outside of yum.
  Installing : lxc-libs-1.0.9-1.el6.x86_64                                                                                                                                                                                  1/7
  Installing : lua-filesystem-1.4.2-1.el6.x86_64                                                                                                                                                                            2/7
  Installing : lua-lxc-1.0.9-1.el6.x86_64                                                                                                                                                                                   3/7
  Installing : libcgroup-0.40.rc1-23.el6.x86_64                                                                                                                                                                             4/7
  Installing : lua-alt-getopt-0.7.0-1.el6.noarch                                                                                                                                                                            5/7
  Installing : lxc-1.0.9-1.el6.x86_64                                                                                                                                                                                       6/7
  Installing : docker-io-1.7.1-2.el6.x86_64                                                                                                                                                                                 7/7
  Verifying  : lua-lxc-1.0.9-1.el6.x86_64                                                                                                                                                                                   1/7
  Verifying  : lxc-libs-1.0.9-1.el6.x86_64                                                                                                                                                                                  2/7
  Verifying  : lxc-1.0.9-1.el6.x86_64                                                                                                                                                                                       3/7
  Verifying  : docker-io-1.7.1-2.el6.x86_64                                                                                                                                                                                 4/7
  Verifying  : lua-alt-getopt-0.7.0-1.el6.noarch                                                                                                                                                                            5/7
  Verifying  : libcgroup-0.40.rc1-23.el6.x86_64                                                                                                                                                                             6/7
  Verifying  : lua-filesystem-1.4.2-1.el6.x86_64                                                                                                                                                                            7/7

Installed:
  docker-io.x86_64 0:1.7.1-2.el6                                                                                                                                                                                                

Dependency Installed:
  libcgroup.x86_64 0:0.40.rc1-23.el6      lua-alt-getopt.noarch 0:0.7.0-1.el6      lua-filesystem.x86_64 0:1.4.2-1.el6      lua-lxc.x86_64 0:1.0.9-1.el6      lxc.x86_64 0:1.0.9-1.el6      lxc-libs.x86_64 0:1.0.9-1.el6     

Complete!

[[email protected] docker]# docker -v

Docker version 1.7.1, build 786b29d/1.7.1

安裝完成！

至此，本想升級Linux核心，但按照下面的教程沒有成功，所以 http://www.docker.org.cn/book/docker/what-is-docker-16.html ，docker入門手冊繼續！docker pull learn/tutorial時報錯，繼續下一步（自動下載），就OK！

======================================================================================================================

檢查當前版本

[[email protected]~]$ uname -r

2.6.32-279.el6.x86_64

檢視當前的/boot/grub/grub.conf內容：

下面使用root使用者操作：

[[email protected]~]# cat /boot/grub/grub.conf

#grub.conf generated by anaconda

#

#Note that you do not have to rerun grub after making changes to this file

#NOTICE:  You do not have a /bootpartition.  This means that

#          all kernel and initrd paths arerelative to /, eg.

#          root (hd0,0)

#          kernel /boot/vmlinuz-version roroot=/dev/sda1

#          initrd/boot/initrd-[generic-]version.img

#boot=/dev/sda

default=0

timeout=5

splashimage=(hd0,0)/boot/grub/splash.xpm.gz

hiddenmenu

titleCentOS (2.6.32-279.el6.x86_64)

        root (hd0,0)

        kernel /boot/vmlinuz-2.6.32-279.el6.x86_64ro root=UUID=41262435-0821-4978-a349-5edf0b1caf32 rd_NO_LUKS rd_NO_LVMLANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgbquiet

        initrd/boot/initramfs-2.6.32-279.el6.x86_64.img

[[email protected]~]#

安裝所需要的工具：

[[email protected]~]# yum install wget gcc gc bc gd make perl ncursec-devel xz –y

如果此處，執行時遇到問題，比如：

Loaded plugins: fastestmirror, security
Determining fastest mirrors
Setting up Install Process
No package gc available.
No package ncursec-devel available.
Nothing to do

【這是由於沒有配置正確yum的源導致，可通過ll /etc/yum.repos.d/來檢查，看看是否是存在CentOS-Base.repo，

以及內容：

[base]
name=CentOS-$releasever - Base
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6


#released updates 
[updates]
name=CentOS-$releasever - Updates
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
#baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6


#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
#baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6


#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=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6


#contrib - packages by Centos Users
[contrib]
name=CentOS-$releasever - Contrib
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib
#baseurl=http://mirror.centos.org/centos/$releasever/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6】

下載核心檔案：

cd /usr/src  

xz  -d Linux-3.11.4.tar.xz # 解壓.xz   （補充：目前可以直接使用 tar xvJf  ***.tar.xz來解壓）

tar  -xvf linux-3.11.4.tar # 解壓.tar

cd linux-3.11.4

清理系統內的環境變數及依賴

make mrproper #清除環境變數

cp  /boot/config-* /usr/src/kernels/ #為了方便編譯配置，將/boot下的配置檔案複製到當前目錄下的/usr/src/kernels/檔案中

make   menuconfig出現General setup選單，根據自己的需要對Kernel進行增、減。

報錯時：（yum install ncurses ncurses-devel）

make  clean

make bzImage    #生成核心檔案

make  modules    #編譯模組（注：此處需要很長時間，請耐心等待，給我的環境輕鬆一個半小時+）

make  modules_install  #安裝模組

make  install    #安裝，此處報了一個vmware的錯【ERROR: modinfo: could not find module vmware_balloon】，是因為在VM中執行導致的，但不影響升級

下面修改/boot/grub/grub.conf檔案，把default=1改為0

[[email protected]]# vi  /boot/grub/grub.conf

#grub.conf generated by anaconda

#

#Note that you do not have to rerun grub after making changes to this file

#NOTICE:  You do not have a /bootpartition.  This means that

#          all kernel and initrd paths arerelative to /, eg.

#          root (hd0,0)

#          kernel /boot/vmlinuz-version roroot=/dev/sda1

#          initrd/boot/initrd-[generic-]version.img

#boot=/dev/sda

default=0

timeout=5

splashimage=(hd0,0)/boot/grub/splash.xpm.gz

hiddenmenu

titleCentOS (3.11.4)

        root (hd0,0)

        kernel /boot/vmlinuz-3.11.4 roroot=UUID=41262435-0821-4978-a349-5edf0b1caf32 rd_NO_LUKS rd_NO_LVMLANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgbquiet

        initrd /boot/initramfs-3.11.4.img

titleCentOS (2.6.32-279.el6.x86_64)

        root (hd0,0)

        kernel/boot/vmlinuz-2.6.32-279.el6.x86_64 roroot=UUID=41262435-0821-4978-a349-5edf0b1caf32 rd_NO_LUKS rd_NO_LVMLANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgbquiet

        initrd/boot/initramfs-2.6.32-279.el6.x86_64.img

重啟之後看看版本號：

reboot

uname -r

[[email protected] ~]$ uname -r

3.11.4

此時升級完成。