一.运行docker Linux内核版本需要在3.8以上,针对centos6.5 内核为2.6的系统需要先升级内核.不然会特别卡，退出容器.
在yum的ELRepo源中,有mainline（3.13.1）、long-term（3.10.28）这2个内核版本，考虑到long-term更稳定，会长期更新，所以选择这个版本。
1.查看当前版本：
引用
[root@localhost ~]# more /etc/issue
CentOS release 6.5 (Final)
Kernel \r on an \m
[root@localhost ~]# uname -a
Linux localhost.localdomain 2.6.32-431.el6.x86_64 #1 SMP Fri Nov 22 03:15:09 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
CentOS release 6.5 (Final)
Kernel \r on an \m
[root@localhost ~]# uname -a
Linux localhost.localdomain 2.6.32-431.el6.x86_64 #1 SMP Fri Nov 22 03:15:09 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
2.升级内核至3.10.28
- 1.>导入public key
- 2.>安装ELRepo到CentOS-6.5中
- 3.>安装**kernel-lt（lt=long-term）**
- 4.>编辑grub.conf文件，修改Grub引导顺序
- 5.>重启，查看内核版本号.
引用
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
引用
rpm -ivh http://www.elrepo.org/elrepo-release-6-6.el6.elrepo.noarch.rpm
引用
yum --enablerepo=elrepo-kernel install kernel-lt -y
或者安装kernel-ml（ml=mainline）
引用
yum --enablerepo=elrepo-kernel install kernel-ml -y
引用
vim /etc/grub.conf
# grub.conf generated by anaconda
#
default=0
timeout=5
splashimage=(hd0,0)/boot/grub/splash.xpm.gz
hiddenmenu
title CentOS (3.10.28-1.el6.elrepo.x86_64)
root (hd0,0)
kernel /boot/vmlinuz-3.10.28-1.el6.elrepo.x86_64 ro root=UUID=0a05411f-16f2-4d69-beb0-2db4cefd3613 rd_NO_LUKS KEYBOARDTYPE=pc KEYTABLE=us rd_NO_MD crashkernel=auto.UTF-8 rd_NO_LVM rd_NO_DM rhgb quiet
initrd /boot/initramfs-3.10.28-1.el6.elrepo.x86_64.img
title CentOS (2.6.32-431.3.1.el6.x86_64)
root (hd0,0)
kernel /boot/vmlinuz-2.6.32-431.3.1.el6.x86_64 ro root=UUID=0a05411f-16f2-4d69-beb0-2db4cefd3613 rd_NO_LUKS KEYBOARDTYPE=pc KEYTABLE=us rd_NO_MD crashkernel=auto.UTF-8 rd_NO_LVM rd_NO_DM rhgb quiet
initrd /boot/initramfs-2.6.32-431.3.1.el6.x86_64.img
# grub.conf generated by anaconda
#
default=0
timeout=5
splashimage=(hd0,0)/boot/grub/splash.xpm.gz
hiddenmenu
title CentOS (3.10.28-1.el6.elrepo.x86_64)
root (hd0,0)
kernel /boot/vmlinuz-3.10.28-1.el6.elrepo.x86_64 ro root=UUID=0a05411f-16f2-4d69-beb0-2db4cefd3613 rd_NO_LUKS KEYBOARDTYPE=pc KEYTABLE=us rd_NO_MD crashkernel=auto.UTF-8 rd_NO_LVM rd_NO_DM rhgb quiet
initrd /boot/initramfs-3.10.28-1.el6.elrepo.x86_64.img
title CentOS (2.6.32-431.3.1.el6.x86_64)
root (hd0,0)
kernel /boot/vmlinuz-2.6.32-431.3.1.el6.x86_64 ro root=UUID=0a05411f-16f2-4d69-beb0-2db4cefd3613 rd_NO_LUKS KEYBOARDTYPE=pc KEYTABLE=us rd_NO_MD crashkernel=auto.UTF-8 rd_NO_LVM rd_NO_DM rhgb quiet
initrd /boot/initramfs-2.6.32-431.3.1.el6.x86_64.img
确认刚安装好的内核在哪个位置，然后设置default值（从0开始），一般新安装的内核在第一个位置，所以设置default=0
引用
[root@localhost ~]# reboot
[root@localhost ~]# uname -r
3.10.104-1.el6.elrepo.x86_64
[root@localhost ~]# uname -r
3.10.104-1.el6.elrepo.x86_64
至此，CentOS6.5的内核升级完成，下面就可以安装docker了.
二.安装docker
直接使用命令: yum install docker-io 是会报错的!!! 提示:No package docker-io available.
需要先安装yum 源.
引用
yum -y install http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
再执行
引用
yum install docker-io
就可以正常安装了!!
在安装的过程中由于dns的问题报了错，所以要设置好自己的dns确保服务器能连接到外网，我当时设置的dns为：
引用
vim /etc/resolv.conf
nameserver 8.8.8.8
nameserver 8.8.4.4
nameserver 8.8.8.8
nameserver 8.8.4.4
启动docker
引用
service docker start
查看docker版本：
引用
[root@localhost ]# docker version
Client version: 1.7.1
Client API version: 1.19
Go version (client): go1.4.2
Git commit (client): 786b29d/1.7.1
OS/Arch (client): linux/amd64
Server version: 1.7.1
Server API version: 1.19
Go version (server): go1.4.2
Git commit (server): 786b29d/1.7.1
OS/Arch (server): linux/amd64
Client version: 1.7.1
Client API version: 1.19
Go version (client): go1.4.2
Git commit (client): 786b29d/1.7.1
OS/Arch (client): linux/amd64
Server version: 1.7.1
Server API version: 1.19
Go version (server): go1.4.2
Git commit (server): 786b29d/1.7.1
OS/Arch (server): linux/amd64
查看docker日志
引用
cat /var/log/docker
至此，docker安装完成！！！
参考： http://www.cnblogs.com/saneri/p/6178536.html
docker官网： https://docs.docker.com/engine/installation/linux/centos/