From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Zhang Haoyu" <zhanghy@sangfor.com>
Subject: Re: [question] updating the base image for all clones which havebeen running for months
Date: Mon, 3 Nov 2014 20:37:47 +0800
Message-ID: <201411032037450771771@sangfor.com>
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 <20141103121421.GE4437@noname.str.redhat.com>
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Cc: "qemu-devel" <qemu-devel@nongnu.org>, "kvm" <kvm@vger.kernel.org>,
	"Stefan Hajnoczi" <stefanha@redhat.com>
To: "Kevin Wolf" <kwolf@redhat.com>
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>> Hi, all
>> 
>> I used base image A to clone so many vm, 
>> after running for months, each vm has its own private applications and data,
>> which maybe different from each other.
>> Now, I want to install some applications for all of the clones,
>> what should I do?
>
>Install the applications on each clone separately, or use some other
>method to make it available (like installing on a shared network
>resource).
>
Could you detail "installing on a shared network resource"?

Thanks,
Zhang Haoyu
>> Can I rebase image A to B which have the applications to be installed,
>> then change the base image to B for all clones?
>
>The problem is that rebase works on the block level, not on the file
>system level. 
Yes, this is the point.

>Changing the backing file won't produce a correctly
>working guest, it causes file system corruption.
>
>Kevin