scripted migration (without Alt-Ctrl-2 / qemu-monitor) - possible?
Is it possible to do a migration (or any other maintenance, like stopping a guest VM) without qemu-monitor / Alt-Ctrl-2?
For those using Xen, it would be similar to a command line "xm" which migrates a guest/domain to a different host - just SSH to your server (or use it in a script etc.), and do:
xm migrate <Domain> <Host>
Similarly, lots of other actions are possible, like pausing, rebooting, shutting down, saving, restoring etc.
The idea of having to "alt-ctrl-2 on the SDL window" does seem a bit incompatible with CLI, doesn't it?
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Quoted 11 lines · Tomasz Chmielewski
Is it possible to do a migration (or any other maintenance, like stopping a guest VM) without qemu-monitor / Alt-Ctrl-2?
For those using Xen, it would be similar to a command line "xm" which migrates a guest/domain to a different host - just SSH to your server (or use it in a script etc.), and do:
xm migrate <Domain> <Host>
Quoted 8 lines
Similarly, lots of other actions are possible, like pausing, rebooting, shutting down, saving, restoring etc.
The idea of having to "alt-ctrl-2 on the SDL window" does seem a bit incompatible with CLI, doesn't it?
Look up the qemu -monitor option. This allows you to redirect the qemu console anywhere you like, including stdio, pipes, tcp sockets, etc. It's wonderfully flexible.
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Quoted 16 lines · Avi Kivity
Quoted 15 lines · Tomasz Chmielewski
Is it possible to do a migration (or any other maintenance, like stopping a guest VM) without qemu-monitor / Alt-Ctrl-2?
For those using Xen, it would be similar to a command line "xm" which migrates a guest/domain to a different host - just SSH to your server (or use it in a script etc.), and do:
xm migrate <Domain> <Host>
Similarly, lots of other actions are possible, like pausing, rebooting, shutting down, saving, restoring etc.
Quoted 8 lines
Quoted 4 lines
The idea of having to "alt-ctrl-2 on the SDL window" does seem a bit incompatible with CLI, doesn't it?
Look up the qemu -monitor option. This allows you to redirect the qemu console anywhere you like, including stdio, pipes, tcp sockets, etc. It's wonderfully flexible.
All right - so I see it belongs more to qemu documentation than KVM's (+/- KVM extensions like migration etc.).
Not as easy to use and intuitive as "xm" - some instruction here, as Qemu's "-monitor dev" documentation seems a bit incomplete as it mentions only "vc" and "stdio":
1. Make a /tmp/guest socket; then start a guest
qemu (...) -monitor unix:/tmp/quest,server,nowait
2. Show qemu-monitor's help:
echo 'help' | socat - unix-connect:/tmp/quest
The things get more complicated if you run multiple quests - you have to keep track of the pipes etc.
Certainly, it is possible to write a powerful backend to that - as you say, if it supports tcp sockets, it would be even possible to support multiple KVM/qemu servers with one program or a script - something that Xen's "xm" can't easily do.
Are there any ready solutions for that? Or the wheel still waits to be invented?
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Quoted 5 lines · Tomasz Chmielewski
Quoted 4 lines
Look up the qemu -monitor option. This allows you to redirect the qemu console anywhere you like, including stdio, pipes, tcp sockets, etc. It's wonderfully flexible.
Quoted 7 lines
All right - so I see it belongs more to qemu documentation than KVM's (+/- KVM extensions like migration etc.).
Not as easy to use and intuitive as "xm" - some instruction here, as Qemu's "-monitor dev" documentation seems a bit incomplete as it mentions only "vc" and "stdio":
The various device options are documented under '-serial'.
Quoted 16 lines
1. Make a
/tmp/guestsocket; then start a guestqemu (...) -monitor unix:/tmp/quest,server,nowait
2. Show qemu-monitor's help:
echo 'help' | socat - unix-connect:/tmp/quest
The things get more complicated if you run multiple quests - you have to keep track of the pipes etc.
Quoted 10 lines
Certainly, it is possible to write a powerful backend to that - as you say, if it supports tcp sockets, it would be even possible to support multiple KVM/qemu servers with one program or a script - something that Xen's "xm" can't easily do.
Are there any ready solutions for that? Or the wheel still waits to be invented?
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Quoted 10 lines
Quoted 10 lines
1. Make a
/tmp/guestsocket; then start a guestqemu (...) -monitor unix:/tmp/quest,server,nowait
2. Show qemu-monitor's help:
echo 'help' | socat - unix-connect:/tmp/quest
You can also try with a tcp device and telnet it.
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Quoted 23 lines · Avi Kivity
Quoted 11 lines · Tomasz Chmielewski
Is it possible to do a migration (or any other maintenance, like stopping a guest VM) without qemu-monitor / Alt-Ctrl-2?
For those using Xen, it would be similar to a command line "xm" which migrates a guest/domain to a different host - just SSH to your server (or use it in a script etc.), and do:
xm migrate <Domain> <Host>
Quoted 9 lines
Similarly, lots of other actions are possible, like pausing, rebooting, shutting down, saving, restoring etc.
The idea of having to "alt-ctrl-2 on the SDL window" does seem a bit incompatible with CLI, doesn't it?
Quoted 4 lines
Look up the qemu -monitor option. This allows you to redirect the qemu console anywhere you like, including stdio, pipes, tcp sockets, etc. It's wonderfully flexible.
A nice trick is to redirect the monitor to a unix socket and then use:
echo 'migrate ssh://foo' | socat stdio unix:/path/to/socket
It's pretty easy to write a small program that lets you execute monitor commands externally. I've got a patch in my queue that adds a standard convention for monitor socket paths based on a guest "name" with the idea that you could write something very similar to xm. Just have to figure out how to address some of the lingering issues with it (mostly, how to clean things up reliably on exit).
Regards,
Anthony Liguori
Regards,
Anthony Liguori
Quoted 2 lines
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