CentOS6离线安装docker1.7,以及相关的依赖架包,包括docker-io-1.7.1-2.el6.x86_64.rpm、lxc-libs-1.0.11-1.el6.x86_64.rpm、lxc-1.0.11-1.el6.x86_64.rpm等以及device-mapper-1.02.117-12.el6_9.1.x86_64.rpm、device-mapper-event-1.02.117-12.el6_9.1.x86_64.rpm等升级包;对于内核版本低的系统,无需升级也能安装docker