CentOS Docker 安装
Docker支持以下的CentOS版本：
CentOS 7 (64-bit)
CentOS 6.5 (64-bit) 或更高的版本版本要求
目前，CentOS 仅发行版本中的内核支持 Docker。
Docker 运行在 CentOS 7 上，要求系统为64位、系统内核版本为 3.10 以上。
Docker 运行在 CentOS-6.5 或更高的版本的 CentOS 上，要求系统为64位、系统内核版本为 2.6.32-431 或者更高版本。查看操作系统版本
[root@Optimus ~]# cat /etc/issue
CentOS release 6.6 (Final)
Kernel \r on an \m
[root@Optimus ~]# cat /proc/version
Linux version 2.6.32-504.el6.x86_64 (mockbuild@c6b9.bsys.dev.centos.org) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-11) (GCC) ) #1 SMP Wed Oct 15 04:27:16 UTC 2014
安装
教程参考：
安装docker
1. yum install -y epel-releas
2. yum install docker-io
[root@Optimus ~]# 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.btte.net
* epel: ftp.riken.jp
* extras: mirrors.btte.net
* updates: mirrors.btte.net
base | 3.7 kB 00:00
epel | 4.3 kB 00:00
epel/primary_db | 5.9 MB 00:40
extras | 3.4 kB 00:00
nginx | 2.9 kB 00:00
updates | 3.4 kB 00:00
updates/primary_db | 4.7 MB 00:26
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.rc1-24.el6_9 will be installed
---> Package lxc.x86_64 0:1.0.10-2.el6 will be installed
--> Processing Dependency: lua-lxc(x86-64) = 1.0.10-2.el6 for package: lxc-1.0.10-2.el6.x86_64
--> Processing Dependency: lua-alt-getopt for package: lxc-1.0.10-2.el6.x86_64
--> Processing Dependency: liblxc.so.1()(64bit) for package: lxc-1.0.10-2.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 0:1.0.10-2.el6 will be installed
--> Processing Dependency: lua-filesystem for package: lua-lxc-1.0.10-2.el6.x86_64
---> Package lxc-libs.x86_64 0:1.0.10-2.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.rc1-24.el6_9 updates 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 1.0.10-2.el6 epel 16 k
lxc x86_64 1.0.10-2.el6 epel 124 k
lxc-libs x86_64 1.0.10-2.el6 epel 258 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 00:25
(2/7): libcgroup-0.40.rc1-24.el6_9.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-1.0.10-2.el6.x86_64.rpm | 16 kB 00:00
(6/7): lxc-1.0.10-2.el6.x86_64.rpm | 124 kB 00:00
(7/7): lxc-libs-1.0.10-2.el6.x86_64.rpm | 258 kB 00:01
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total 177 kB/s | 5.1 MB 00:29
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) <epel@fedoraproject.org>
Package: epel-release-6-8.noarch (@extras)
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
Installing : lxc-libs-1.0.10-2.el6.x86_64 1/7
Installing : lua-filesystem-1.4.2-1.el6.x86_64 2/7
Installing : lua-lxc-1.0.10-2.el6.x86_64 3/7
Installing : lua-alt-getopt-0.7.0-1.el6.noarch 4/7
Installing : lxc-1.0.10-2.el6.x86_64 5/7
Installing : libcgroup-0.40.rc1-24.el6_9.x86_64 6/7
Installing : docker-io-1.7.1-2.el6.x86_64 7/7
Verifying : lua-lxc-1.0.10-2.el6.x86_64 1/7
Verifying : lxc-libs-1.0.10-2.el6.x86_64 2/7
Verifying : libcgroup-0.40.rc1-24.el6_9.x86_64 3/7
Verifying : lxc-1.0.10-2.el6.x86_64 4/7
Verifying : docker-io-1.7.1-2.el6.x86_64 5/7
Verifying : lua-alt-getopt-0.7.0-1.el6.noarch 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.rc1-24.el6_9 lua-alt-getopt.noarch 0:0.7.0-1.el6 lua-filesystem.x86_64 0:1.4.2-1.el6 lua-lxc.x86_64 0:1.0.10-2.el6 lxc.x86_64 0:1.0.10-2.el6 lxc-libs.x86_64 0:1.0.10-2.el6
Complete!
加入开机启动
[root@Optimus ~]# chkconfig docker on
启动docker
[root@Optimus ~]# service docker start
Starting cgconfig service: [ OK ]
Starting docker: [ OK ]
查看docker版本
[root@Optimus ~]# 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查看docker信息
[root@Optimus ~]# docker info
Containers: 0
Images: 0
Storage Driver: devicemapper
Pool Name: docker-8:1-67240264-pool
Pool Blocksize: 65.54 kB
Backing Filesystem: extfs
Data file: /dev/loop0
Metadata file: /dev/loop1
Data Space Used: 305.7 MB
Data Space Total: 107.4 GB
Data Space Available: 107.1 GB
Metadata Space Used: 733.2 kB
Metadata Space Total: 2.147 GB
Metadata Space Available: 2.147 GB
Udev Sync Supported: true
Deferred Removal Enabled: false
Data loop file: /var/lib/docker/devicemapper/devicemapper/data
Metadata loop file: /var/lib/docker/devicemapper/devicemapper/metadata
Library Version: 1.02.89-RHEL6 (2014-09-01)
Execution Driver: native-0.2
Logging Driver: json-file
Kernel Version: 2.6.32-504.el6.x86_64
Operating System: <unknown>
CPUs: 24
Total Memory: 15.52 GiB
Name: Optimus
ID: OKJW:54WI:244F:NBPA:ULP6:LTA3:TJ5T:4VNH:EALS:YGYJ:POLS:WIV5
下载centos镜像
[root@Optimus ~]# docker pull centos
latest: Pulling from centos
6c5159923047: Pull complete
acec82331181: Pull complete
1c1b67b33c28: Pull complete
Digest: sha256:57c91a43765de2147fa666a128477bc6101d6fda660feaaa5fbb1a8b110c934f
Status: Downloaded newer image for centos:latest
查看镜像
[root@Optimus ~]# docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
centos latest 1c1b67b33c28 5 weeks ago 196.6 MB
运行centos镜像
[root@Optimus ~]# docker run -i -t centos /bin/bash
[root@0d1f6225836b /]#
查找镜像
[root@Optimus ~]# docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
centos latest 1c1b67b33c28 5 weeks ago 196.6 MB
[root@Optimus ~]# docker images -a
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
centos latest 1c1b67b33c28 5 weeks ago 196.6 MB
<none> <none> 6c5159923047 5 weeks ago 196.6 MB
<none> <none> acec82331181 5 weeks ago 196.6 MB
删除镜像：第一次删除时显示冲突，加-f强制删除
[root@Optimus ~]# docker rmi 1c1b67b33c28
Error response from daemon: Conflict, cannot delete 1c1b67b33c28 because the container 0d1f6225836b is using it, use -f to force
Error: failed to remove images: [1c1b67b33c28]
[root@Optimus ~]# docker rmi -f 1c1b67b33c28
Untagged: centos:latest
Deleted: 1c1b67b33c2810dcdbe70cf5ab186f1de50b138d06877e6b8421d5329a70beb1
Deleted: acec82331181312afa99df6a79e541ea819d64d32af6f4d3656897ce63d55f88
Deleted: 6c51599230478bde53cfcf5f4e7f68c2bf295102f31146c0bb6e9b814365c0e7
[root@Optimus ~]# docker images -a
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
[root@Optimus ~]#
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