[Qemu-devel] question about qemu migrate.

[Qemu-devel] question about qemu migrate.

[Sheldon]

I find there are four kinds of uri for qmp_migrate
"tcp:", "exec:", "unix:", and "fd:"


now I want to migrate the vm to a local file with "exec:" uri by 
hmp-command.

How should I do the migration?

Re: [Qemu-devel] question about qemu migrate.

[Amos Kong]

[-- Attachment #1: Type: text/plain, Size: 363 bytes --]

On Sun, Jul 22, 2012 at 12:30 PM, Sheldon <shaohef@linux.vnet.ibm.com>wrote:

> I find there are four kinds of uri for qmp_migrate
> "tcp:", "exec:", "unix:", and "fd:"
>
>
> now I want to migrate the vm to a local file with "exec:" uri by
> hmp-command.
>
> How should I do the migration?
>

(qemu) migrate -d exec:cat>/tmp/vm.out
.... -incoming fd:</tmp/vm.out

[-- Attachment #2: Type: text/html, Size: 831 bytes --]

Re: [Qemu-devel] question about qemu migrate.

[Sheldon]

[-- Attachment #1: Type: text/plain, Size: 947 bytes --]

On 07/22/2012 12:49 PM, Amos Kong wrote:
> On Sun, Jul 22, 2012 at 12:30 PM, Sheldon <shaohef@linux.vnet.ibm.com 
> <mailto:shaohef@linux.vnet.ibm.com>> wrote:
>
>     I find there are four kinds of uri for qmp_migrate
>     "tcp:", "exec:", "unix:", and "fd:"
>
>
>     now I want to migrate the vm to a local file with "exec:" uri by
>     hmp-command.
>
>     How should I do the migration?
>
>
> (qemu) migrate -d exec:cat>/tmp/vm.out
> .... -incoming fd:</tmp/vm.out

thank you. it can work now.
there are still some questions.
1. the migration file vm.out  is  a QEMU suspend to disk image.
How can I reboot vm.out by QEMU?

2. I execute "migrate" with -b option, seems that the "migrate" runs at 
background.
I cat get the "migrate" information by qmp , there is a { "execute": 
"query-migrate" } command in qmp-command.
But I can not get the the "migrate" information by hmp,  there is not a 
"query-migrate" command in hmp-command.







[-- Attachment #2: Type: text/html, Size: 2046 bytes --]

Re: [Qemu-devel] question about qemu migrate.

[Amos Kong]

On Sun, Jul 22, 2012 at 10:59 PM, Sheldon <shaohef@linux.vnet.ibm.com> wrote:
>
>
> (qemu) migrate -d exec:cat>/tmp/vm.out
> .... -incoming fd:</tmp/vm.out
>
> thank you. it can work now.
> there are still some questions.
> 1. the migration file vm.out is a QEMU suspend to disk image.
> How can I reboot vm.out by QEMU?


Load the suspend vm.out by  # qemu-kvm .... incoming fd</tmp/vm.out,
and execute monitor cmd to reboot  # system_reset.
Then re-dump VM to disk by (qemu) migrate -d exec:cat>/tmp/vm.out2

Is it satisfied for you?


> 2. I execute "migrate" with -b option, seems that the "migrate" runs
> at background.
> I cat get the "migrate" information by qmp , there is a { "execute":
> "query-migrate" } command in qmp-command.


> But I can not get the the "migrate" information by hmp, there is not
> a "query-migrate" command in hmp-command.

(qemu) info migrate

info commands(for hmp) always correspond with query commands(for qmp),
some query-cmds are not implemented right now (eg. query-network)


hmp            qmp
---            ---
info status -> query-status
info block  -> query-block
info pci    -> query-pci
....

Re: [Qemu-devel] question about qemu migrate.

[Sheldon]

[-- Attachment #1: Type: text/plain, Size: 1651 bytes --]

On 07/23/2012 06:26 AM, Amos Kong wrote:
> On Sun, Jul 22, 2012 at 10:59 PM, Sheldon <shaohef@linux.vnet.ibm.com> wrote:
>>
>> (qemu) migrate -d exec:cat>/tmp/vm.out
>> .... -incoming fd:</tmp/vm.out
>>
>> thank you. it can work now.
>> there are still some questions.
>> 1. the migration file vm.out is a QEMU suspend to disk image.
>> How can I reboot vm.out by QEMU?
>
> Load the suspend vm.out by  # qemu-kvm .... incoming fd</tmp/vm.out,
> and execute monitor cmd to reboot  # system_reset.
> Then re-dump VM to disk by (qemu) migrate -d exec:cat>/tmp/vm.out2
>
> Is it satisfied for you?
Thank for your patience.

Load the suspend vm.out by  # qemu-kvm .... incoming fd</tmp/vm.out,

Actual, I have not do it successfully.  For I can not load the suspend 
vm.out, the hmp terminal report "load of migration failed"

When "migrate" with -b option (full copy of disk), the suspend vm.out 
will copy the source image.
So if I Load the suspend vm.out, does the qemu need the source image?

>
>> 2. I execute "migrate" with -b option, seems that the "migrate" runs
>> at background.
>> I cat get the "migrate" information by qmp , there is a { "execute":
>> "query-migrate" } command in qmp-command.
>
>> But I can not get the the "migrate" information by hmp, there is not
>> a "query-migrate" command in hmp-command.
> (qemu) info migrate
>
> info commands(for hmp) always correspond with query commands(for qmp),
> some query-cmds are not implemented right now (eg. query-network)
>
>
> hmp            qmp
> ---            ---
> info status -> query-status
> info block  -> query-block
> info pci    -> query-pci
> ....
got it. Thank you again.



[-- Attachment #2: Type: text/html, Size: 2824 bytes --]