Any news on lxc online migration?

[grin]

It's been more than 2 years now since I last asked about the status report of online migration of containers.
Oh, and got no answer, so it's been 5 years since I have heard anything about this from you guys.

Would be nice to know that at least you keep in mind that we're right here waiting.

Thanks!

 

[gurubert]

I do not think that it is possible to live migrate a container.

A container are just processes running in a different namespace on the host's kernel.

You cannot freeze a process and transport it to another host and unfreeze it there like you can do with a virtual machine.

 

[grin]

I do not think that it is possible to live migrate a container.

A container are just processes running in a different namespace on the host's kernel.

You cannot freeze a process and transport it to another host and unfreeze it there like you can do with a virtual machine.

I understand that you don't think that.
Have you ever seen OpenVZ? It also have done the "impossible", and had a working checkpointing and freeze/thaw infrastructure.

Like: https://www.kernel.org/doc/Documentation/cgroup-v1/freezer-subsystem.txt

I guess you never heard of criu either?

 

[gurubert]

I learn something new every day.

 

[grin]

I also remember, half a decade ago that someone have complained about various mount(ed) namespaces and that their freeze isn't well developed in the kernel, but since then a lot of years have came to pass, and it may work.

I probably shall play a little with criu and lxc and see what I get, but it's not the same as our renowned px developers.

 

[VictorSTS]

IMHO this should be reported to bugzilla [1] as a request for enhancement, so devels may take a look eventually and check if it can be implemented. It would be wonderful if LXC could be live migrated.

[1] https://bugzilla.proxmox.com/buglist.cgi?component=lxc&list_id=44785&product=pve&resolution=---

 

[grin]

IMHO this should be reported to bugzilla [1] as a request for enhancement, so devels may take a look eventually and check if it can be implemented. It would be wonderful if LXC could be live migrated.

[1] https://bugzilla.proxmox.com/buglist.cgi?component=lxc&list_id=44785&product=pve&resolution=---

It's a longer list but yes, you are right, somehow I haven't opened it yet. Now I have.

 

[grin]

I wouldn't say it's easy to tell where are we now, or when the developers have checked the state of affairs last time, and what works and what not and what's blocking and where, and where is progress and what's stuck, et cetera:

• https://forum.proxmox.com/threads/lxd-4-20-supports-live-migration-of-lxc-containers.99939/
• https://forum.proxmox.com/threads/proxmox-lxd.37052/
• https://forum.proxmox.com/threads/live-migration-von-containern.133591/
• https://forum.proxmox.com/threads/lxc-live-migration-roadmap.115265/
• https://forum.proxmox.com/threads/criu-or-how-to-migrate-containers.110694/
• https://forum.proxmox.com/threads/s...shutdown-reboot-and-restore-on-reboot.110187/
• https://forum.proxmox.com/threads/pct-suspend-is-working-on-latest-version.77880/
• https://forum.proxmox.com/threads/can-not-suspend-lxc.34507/
• https://forum.proxmox.com/threads/live-migration-lxc.38682/
• https://forum.proxmox.com/threads/lxc-live-migration-with-criu.29762/
• https://forum.proxmox.com/threads/criu-lxc-online-migration-status.43217/

 

[exp]

It was THE most disappointing realization that proxmox cannot do what OpenVZ did more than 10 years ago. Understand, it's not easy but heck, everything needed is out there.

I tend to start processes in screen sessions and it's just not a solution to restart the container. It's frustrating that I'd need a VM just because of that.