centos6.2 64 部署docker
安装docker yum源：
yum install http://mirrors.yun-idc.com/epel/6/i386/epel-release-6-8.noarch.rpm
[root@yz6245 yum.repos.d]# yum install docker-io
Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
Error: Cannot retrieve metalink for repository: epel. Please verify its path and try again
解决：
修改repo：https 改为http
yum install docker-io
# 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
Get http:///var/run/docker.sock/v1.19/version: dial unix /var/run/docker.sock: no such file or directory. Are you trying to connect to a TLS-enabled daemon without TLS?
service docker start
启动成功
#service docker start 这里等价于docker -d
docker -d 有报错：
[root@yz6245 yum.repos.d]# docker -d
WARN[0000] You are running linux kernel version 2.6.32-220.el6.x86_64, which might be unstable running docker. Please upgrade your kernel to 3.10.0.
docker: relocation error: docker: symbol dm_task_get_info_with_deferred_remove, version Base not defined in file libdevmapper.so.1.02 with link time reference
解决：
yum install device-mapper-libs
安装成功后还是同样错误，对比在centos6.5上部署的环境，发现device-mapper-libs版本低，故进行了手动rpm安装。
升级高版本后解决。
依赖包：
yum install libudev-devel.x86_64
wget http://mirrors.163.com/centos/6/os/x86_64/Packages/device-mapper-1.02.117-7.el6.x86_64.rpm
wget http://mirrors.163.com/centos/6/os/x86_64/Packages/device-mapper-devel-1.02.117-7.el6.i686.rpm
wget http://mirrors.163.com/centos/6/os/x86_64/Packages/device-mapper-devel-1.02.117-7.el6.x86_64.rpm
wget http://mirrors.163.com/centos/6/os/x86_64/Packages/device-mapper-event-1.02.117-7.el6.x86_64.rpm
wget http://mirrors.163.com/centos/6/os/x86_64/Packages/device-mapper-event-devel-1.02.117-7.el6.i686.rpm
wget http://mirrors.163.com/centos/6/os/x86_64/Packages/device-mapper-event-devel-1.02.117-7.el6.x86_64
wget http://mirrors.163.com/centos/6/os/x86_64/Packages/device-mapper-event-libs-1.02.117-7.el6.i686.rpm
wget http://mirrors.163.com/centos/6/os/x86_64/Packages/device-mapper-event-libs-1.02.117-7.el6.x86_64.rpm
wget http://mirrors.163.com/centos/6/os/x86_64/Packages/device-mapper-libs-1.02.117-7.el6.i686.rpm
wget http://mirrors.163.com/centos/6/os/x86_64/Packages/device-mapper-libs-1.02.117-7.el6.x86_64.rpm
[root@yz6245 device-mapper]# service docker restart
Stopping docker: [FAILED]
Starting docker: [ OK ]
[root@yz6245 device-mapper]# docker -d
WARN[0000] You are running linux kernel version 2.6.32-220.el6.x86_64, which might be unstable running docker. Please upgrade your kernel to 3.10.0.
INFO[0000] Listening for HTTP on unix (/var/run/docker.sock)
ERRO[0000] [graphdriver] prior storage driver "devicemapper" failed: Error running DeviceCreate (CreatePool) dm_task_run failed
FATA[0000] Error starting daemon: error initializing graphdriver: Error running DeviceCreate (CreatePool) dm_task_run failed
还是报错，网上说可能是磁盘空间问题，发现没有异常。
[root@yz6245 device-mapper]#
[root@yz6245 device-mapper]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda1 41284736 7586236 31601360 20% /
tmpfs 1896576 0 1896576 0% /dev/shm
/dev/vda1 309627260 195416 293703700 1% /data0
[root@yz6245 device-mapper]# ll /var/lib/docker/
total 8
drwx------ 4 root root 4096 Sep 22 20:17 devicemapper
drwx------ 2 root root 4096 Sep 22 19:27 tmp
[root@yz6245 device-mapper]# rm -rf /var/lib/docker/*
[root@yz6245 device-mapper]# service docker restart
Stopping docker: [FAILED]
Starting docker: [ OK ]
[root@yz6245 device-mapper]# docker -d
WARN[0000] You are running linux kernel version 2.6.32-220.el6.x86_64, which might be unstable running docker. Please upgrade your kernel to 3.10.0.
ERRO[0000] [graphdriver] prior storage driver "devicemapper" failed: Error running DeviceCreate (CreatePool) dm_task_run failed
FATA[0000] Error starting daemon: error initializing graphdriver: Error running DeviceCreate (CreatePool) dm_task_run failed
-s 是指定使用的文件系统，默认是devicemapper 也可以是vfs 或aufs(ubuntu的）
** 启动docker-daemon不成功，可能是我的线上机器是虚拟机的问题所以加上 -s vfs 就启动成功了。**
#如果要追加参数请修改/etc/sysconfig/docker 这个文件 如：加入other_args=" -s vfs"
[root@yz6245 device-mapper]# docker -d -s vfs
WARN[0000] You are running linux kernel version 2.6.32-220.el6.x86_64, which might be unstable running docker. Please upgrade your kernel to 3.10.0.
INFO[0000] Listening for HTTP on unix (/var/run/docker.sock)
WARN[0000] Running modprobe bridge nf_nat failed with message: , error: exit status 1
WARN[0000] Your kernel does not support oom control.
INFO[0000] Loading containers: start.
INFO[0000] Loading containers: done.
INFO[0000] Daemon has completed initialization
INFO[0000] Docker daemon commit=786b29d/1.7.1 ex
#到目前为止已经能正常pull镜像，但是无法正常运行container。
[root@yz6245 ~]# docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
commonms/ansible latest b3e0a9dd686a 2 days ago 469.2 MB
[root@yz6245 ~]# docker run -i -t commonms/ansible /bin/bash
...
...
一直卡住不动。待解决。
