Copy LXD container to another host

chandra · January 28, 2020, 12:11pm

Yes. I am getting the same error both way. Is there any specific rsync or zfs setting required for live migration of LXD containers?

tomp · January 28, 2020, 12:14pm

Can you try stopping the container and see if that helps, I’m wondering if this is an issue with transferring the CRIU data, as the error “/tmp/lxd_restore” is only mentioned in the source code for live transfer.

chandra · January 28, 2020, 12:15pm

I am able to migrate the stopped container but facing difficulty in migrating a running container.

tomp · January 28, 2020, 12:28pm

OK thanks I’ve re-created your issue now, will take a look into solving it.

chandra · January 28, 2020, 1:03pm

Thanks a lot.

tomp · January 28, 2020, 5:59pm

I’ve added a fix here:

Note that live migration with CRIU doesn’t work well with AppArmor, systemd or NICs, so you may still have a different error even with this fix.

chandra · January 28, 2020, 7:42pm

Thanks!!
Are these changes/updates available on snap or i need to install lxc/lxd using source code?

stgraber · January 28, 2020, 8:59pm

We try to backport as much as we can, though we’ll slow down soon as LXD 3.20 is due on Thursday.

chandra · January 29, 2020, 11:21am

Thanks a lot guys for your support. I have one more question.
When we live migrate a virtual machine from one host to another, only VM’s memory state is transferred from host to destination. The disk state need not to be transferred as it is stored in a network attached storage. If live migration for container works, does it supports a similar setup where disk state is in a network attached storage and we can just transfer the memory states of the container to reduce the down time?

chandra · January 31, 2020, 11:13am

I refreshed the lxd to version 3.20 using snap. I tried to live migrate container after disabling apparmor then it gives message:
cannot change profile for the next exec call: No such file or directory
snap-update-ns failed with code 1: File exists
Then i enabled the apparmor and tried to live migrate then i get message:
Error: Failed instance creation: Error transferring container data: Failed to run: /snap/lxd/current/bin/lxd forkmigrate cont2 /var/snap/lxd/common/lxd/containers /var/snap/lxd/common/lxd/logs/cont2/lxc.conf /tmp/lxd_restore_846816044/final true:

How can we migrate by disabling apparmor as mentioned earlier by Thomas Parrott when snap is dependent upon apparmor i think?