use case for docker pause/unpause

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jude m

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Sep 13, 2014, 4:26:10 AM9/13/14
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Hello All,

Would you please help me understand few use case for docker pause/unpause? 

Is it possible to move a running container from one system to another, like vmotion?

Thanks,
Jeeva

Michael Crosby

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Sep 13, 2014, 4:18:20 PM9/13/14
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Yes, it is the beginning to support live migrations of containers but is still useful on it's own, taking backups without a live process still writing files or releasing cpu resources for another container.

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James Mills

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Sep 13, 2014, 5:41:12 PM9/13/14
to Michael Crosby, jude m, docker-dev

On Sun, Sep 14, 2014 at 6:17 AM, Michael Crosby <crosby....@gmail.com> wrote:
Yes, it is the beginning to support live migrations of containers but is still useful on it's own, taking backups without a live process still writing files or releasing cpu resources for another container.

Are the low-level tools "pause"/"unpause" enough to do live mgirations even now
across different hosts? What would be involved? pause, export,
import (on the other host), unpaise?

cheers
James

Michal Gryko

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Sep 15, 2014, 2:57:50 AM9/15/14
to James Mills, Michael Crosby, jude m, docker-dev
Hi,
It's not yet possible to do full live migration, some people experiment with CRIU but it's not yet ready for live migration of docker container. But check https://github.com/jpetazzo/critmux you will find there good example of using CRIU inside container to save process state. With few scripts it should be possible to move saved state to different container made from same image and restore it there. But I never tested it and don't know how it will react.

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nicolas de loof

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Sep 15, 2014, 3:00:37 AM9/15/14
to Michal Gryko, James Mills, Michael Crosby, jude m, docker-dev
I wonder if docker could support live migration, like kvm/openstack do.

James Mills

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Sep 15, 2014, 3:59:33 AM9/15/14
to nicolas de loof, Michal Gryko, Michael Crosby, jude m, docker-dev
Nice thanks guys. Be interesting to see how this pans out.


Sven Dowideit

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Sep 16, 2014, 12:10:43 AM9/16/14
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Another possible use is to pause resource intensive tasks that you can resume at a later date

heavy computations, or maybe just a runaway browser.

Sven
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