CentOS6.7 上面安装Docker 1.7.1

　　Docker当前发布的最新版本已经到了1.11，其官网上针对Centos的的安装需求如下:

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

看来如果我们想在低于3.x内核的操作系统（比如Centos6.7）上装Docker最新版，势必要升级内核了。且不说升级内核步骤繁琐、容易出错，单就这种比较怪异的搭配：Centos6.x + Kerneol3.X + Docker1.11，就没有人能够保证其稳定性。故我的建议是设法在Centos6.7上安装较低版本的Docker。事实上，对于内核版本要大于3.10这个要求，是从Docker1.8.2版本开始的，Docker之前的版本是可以运行在较低内核版本之上的，比如1.7.1。

　　

　　首先，看下我的操作环境以及直接安装Docker的现象：

[root@localhost ~]# uname -aLinux localhost.localdomain 2.6.32-573.el6.x86_64 #1 SMP Thu Jul 23 15:44:03 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux[root@localhost ~]# cat /etc/redhat-release CentOS release 6.7 (Final)[root@localhost ~]# docker -bash: docker: command not found[root@localhost ~]# yum install dockerLoaded plugins: fastestmirror, refresh-packagekit, securitySetting up Install Processbase                                  | 3.7 kB     00:00     base/primary_db                       | 4.6 MB     00:08     extras                                | 3.4 kB     00:00     extras/primary_db                     |  37 kB     00:00     updates                               | 3.4 kB     00:00     updates/primary_db                    | 5.2 MB     00:55     No package docker available.Error: Nothing to do[root@localhost ~]# yum install docker-ioLoaded plugins: fastestmirror, refresh-packagekit, securitySetting up Install ProcessDetermining fastest mirrors * base: mirrors.zju.edu.cn * extras: mirrors.skyshe.cn * updates: mirrors.zju.edu.cnNo package docker-io available.Error: Nothing to do

可以看到，在Centos6.7的标准yum源中已经没有Docker的安装包了，这时，我们需要安装EPEL。

　　EPEL（Extra Packages for Enterprise Linux），企业版Linux额外包，RHEL分布非标准包的社区类库。安装如下：

[root@localhost ~]# rpm -iUvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpmRetrieving http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpmwarning: /var/tmp/rpm-tmp.sA7VqQ: Header V3 RSA/SHA256 Signature, key ID 0608b895: NOKEYPreparing...                ########################################### [100%]   1:epel-release           ########################################### [100%]

　　

　　接下来安装Docker1.7.1，在1.7.1中，安装包名称为docker-io，故我们的安装命令如下：

[root@localhost ~]# yum install docker-ioLoaded plugins: fastestmirror, refresh-packagekit, securitySetting up Install ProcessLoading mirror speeds from cached hostfileepel/metalink                                                           | 5.3 kB     00:00      * base: mirrors.zju.edu.cn * epel: ftp.cuhk.edu.hk * extras: mirrors.skyshe.cn * updates: mirrors.zju.edu.cnepel                                                                    | 4.3 kB     00:00     epel/primary_db                                                         | 5.9 MB     00:49     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.rc1-17.el6_7 will be installed---> Package lxc.x86_64 0:1.0.8-1.el6 will be installed--> Processing Dependency: lua-lxc(x86-64) = 1.0.8-1.el6 for package: lxc-1.0.8-1.el6.x86_64--> Processing Dependency: lua-alt-getopt for package: lxc-1.0.8-1.el6.x86_64--> Processing Dependency: liblxc.so.1()(64bit) for package: lxc-1.0.8-1.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 0:1.0.8-1.el6 will be installed--> Processing Dependency: lua-filesystem for package: lua-lxc-1.0.8-1.el6.x86_64---> Package lxc-libs.x86_64 0:1.0.8-1.el6 will be installed--> Running transaction check---> Package lua-filesystem.x86_64 0:1.4.2-1.el6 will be installed--> Finished Dependency ResolutionDependencies Resolved=================================================================================== Package               Arch            Version             Repository    Size===================================================================================Installing: docker-io             x86_64          1.7.1-2.el6         epel          4.6 MInstalling for dependencies: libcgroup             x86_64          0.40.rc1-17.el6_7   updates       129 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          1.0.8-1.el6         epel          16 k lxc                   x86_64          1.0.8-1.el6         epel          122 k lxc-libs              x86_64          1.0.8-1.el6         epel          255 kTransaction Summary====================================================================================Install       7 Package(s)Total download size: 5.1 MInstalled size: 20 MIs this ok [y/N]: yDownloading Packages:(1/7): docker-io-1.7.1-2.el6.x86_64.rpm                                   | 4.6 MB     01:09     (2/7): libcgroup-0.40.rc1-17.el6_7.x86_64.rpm                             | 129 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-1.0.8-1.el6.x86_64.rpm                                     |  16 kB     00:00     (6/7): lxc-1.0.8-1.el6.x86_64.rpm                                         | 122 kB     00:01     (7/7): lxc-libs-1.0.8-1.el6.x86_64.rpm                                    | 255 kB     00:08     ----------------------------------------------------------------------------------------------Total                                                          64 kB/s | 5.1 MB     01:21     warning: rpmts_HdrFromFdno: Header V3 RSA/SHA256 Signature, key ID 0608b895: NOKEYRetrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6Importing GPG key 0x0608B895: Userid : EPEL (6) <[e-mail]> Package: epel-release-6-8.noarch (installed) From   : /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6Is this ok [y/N]: ywarning: rpmts_HdrFromFdno: Header V3 RSA/SHA1 Signature, key ID c105b9de: NOKEYRetrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6Importing GPG key 0xC105B9DE: Userid : CentOS-6 Key (CentOS 6 Official Signing Key) <[e-mail]> Package: centos-release-6-7.el6.centos.12.3.x86_64 (@anaconda-CentOS-201508042137.x86_64/6.7) From   : /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6Is this ok [y/N]: yRunning rpm_check_debugRunning Transaction TestTransaction Test SucceededRunning TransactionWarning: RPMDB altered outside of yum.  Installing : lxc-libs-1.0.8-1.el6.x86_64                                              1/7   Installing : lua-filesystem-1.4.2-1.el6.x86_64                                        2/7   Installing : lua-lxc-1.0.8-1.el6.x86_64                                               3/7   Installing : lua-alt-getopt-0.7.0-1.el6.noarch                                        4/7   Installing : lxc-1.0.8-1.el6.x86_64                                                   5/7   Installing : libcgroup-0.40.rc1-17.el6_7.x86_64                                       6/7   Installing : docker-io-1.7.1-2.el6.x86_64                                             7/7   Verifying  : lxc-libs-1.0.8-1.el6.x86_64                                              1/7   Verifying  : libcgroup-0.40.rc1-17.el6_7.x86_64                                       2/7   Verifying  : lua-lxc-1.0.8-1.el6.x86_64                                               3/7   Verifying  : lxc-1.0.8-1.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.el6Dependency Installed:  libcgroup.x86_64 0:0.40.rc1-17.el6_7  lua-alt-getopt.noarch 0:0.7.0-1.el6  lua-filesystem.x86_64 0:1.4.2-1.el6  lua-lxc.x86_64 0:1.0.8-1.el6  lxc.x86_64 0:1.0.8-1.el6  lxc-libs.x86_64 0:1.0.8-1.el6 Complete![root@localhost ~]# docker -vDocker version 1.7.1, build 786b29d/1.7.1