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Re: [Qemu-devel] Adding Disk-Level Introspection to QEMU
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] Adding Disk-Level Introspection to QEMU |
Date: |
Wed, 24 Apr 2013 11:26:59 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130311 Thunderbird/17.0.4 |
Il 23/04/2013 20:31, Wolfgang Richter ha scritto:
> On Tue, Apr 23, 2013 at 2:21 PM, Stefan Hajnoczi <address@hidden
> <mailto:address@hidden>> wrote:
>
> The tracing subsystem is geared towards tracepoint instrumentation
> rather than binary dumps.
>
> Can you share some specific applications?
>
>
> Well, my main application is in exposing a "cloud-inotify" service by
> interpreting
> sector writes in real-time and publishing the updates as file system
> manipulations.
> By using introspection we don't need agents running inside the guest.
>
> Example: guest writes to sector 5786907; I reverse-map that sector and
> notice
> it belongs to '/etc/passwd' within that guest; I immediately emit a message
> (currently using Redis pub-sub functionality) to any interested
> subscribers that
> '/etc/passwd' changed within this guest running on a certain host within the
> datacenter.
If you are okay with writes being "bundled" and you are able to handle
reordered writes within a small timeframe (usually 0.1-1s), then you can
use drive-mirror with an NBD destination.
Paolo
Re: [Qemu-devel] Adding Disk-Level Introspection to QEMU, Stefan Hajnoczi, 2013/04/23
Re: [Qemu-devel] Adding Disk-Level Introspection to QEMU,
Paolo Bonzini <=
Re: [Qemu-devel] Adding Disk-Level Introspection to QEMU, Wolfgang Richter, 2013/04/24
Message not availableMessage not availableRe: [Qemu-devel] Adding Disk-Level Introspection to QEMU, Wolfgang Richter, 2013/04/24