[lxc-users] LXD Live Migration

[Jamie Brown]

Thanks Tycho, installing CRIU solved the problem;

# apt-get install criu

Should this package not be included as a dependency for LXD, or at least provide a meaningful warning if the package isn’t available? It seems odd to advertise out-the-box live migration in LXD, but then have to install another package to provide it.

Is this in the documentation anywhere?

Thanks again.

-- Jamie




On 04/11/2015, 16:47, "lxc-users on behalf of Tycho Andersen" <lxc-users-bounces at lists.linuxcontainers.org on behalf of tycho.andersen at canonical.com> wrote:

>On Wed, Nov 04, 2015 at 01:48:44PM +0000, Jamie Brown wrote:
>> Greetings all.
>> 
>> I’ve been using LXD in a development environment for a few weeks and so far very impressed, 
>> I can see a really bright future for this technology!
>> 
>> However, today I thought I’d try out the live migration, based on the following guide;
>> https://insights.ubuntu.com/2015/05/06/live-migration-in-lxd/
>> 
>> I believe I have followed the steps correctly, however when I run the move command, I 
>> receive the following output;
>> 
>> # lxc move host1:test host2:test
>> error: Error transferring container data: checkpoint failed:
>> Problem accessing CRIU log: open /tmp/lxd_migration_899480871/dump.log: no such file or directory
>> 
>> The file it is referring to above doesn't exist. However, there are other lxd_migration_* 
>> directories with different numbers appended. Each time I attempt the migration a new directory 
>> is created (e.g. lxd_migration_192965652), but there is no dump.log in there.
>> 
>> The migration doesn't create a log file as per the guide above in;
>> /var/log/lxd/test/migration_{dump|restore}_.log
>> 
>> Steps I've taken;
>> 
>> - Copied all profiles from host1 to host2
>> - Added the migratable profile to the container
>> - Removed lxcfs package (on both hosts)
>> - Added the remote HTTPS hosts for both the local and remote hosts
>> 
>> Both hosts are running Ubuntu 14.04.3 LTS (x64) with LXD version 0.21.
>> 
>> The only difference I can tell between my hosts and the guide is that the 'migratable'
>> profile (which came out-the-box with my LXD installation) doesn't contain the autostart
>> entries as in the guide above;
>> 
>> # lxc profile show migratable
>> name: migratable
>> config:
>>   raw.lxc: |-
>>     lxc.console = none
>>     lxc.cgroup.devices.deny = c 5:1 rwm
>>     lxc.seccomp =
>>   security.privileged: "true"
>> devices: {}
>> 
>> 
>> Any help would be much appreciated!
>
>Have you installed CRIU? lxc info --show-log test probably has more
>info about what failed, but my guess is that it can't find CRIU if you
>haven't installed it.
>
>Tycho
>
>> Thank you,
>> 
>> Jamie
>> 
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