红帽全球峰会3.9. 清理订阅池
安装所需的软件包来自定义镜像后，现在我们删除订阅并取消注册镜像：
$ virt-customize -a overcloud-full.qcow2 --run-command 'subscription-manager remove --all'
[ 0.0] Examining the guest ...
[ 12.0] Setting a random seed
[ 12.0] Running: subscription-manager remove --all
[ 18.0] Finishing off这会从镜像中删除所有订阅池。
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