[libvirt-users] Libvirt to return the ip address instead of the hostname during migration

[Gary R Hook]

The tunneled mode for migration is built on GNU TLS and is rather slow. 
Interest moved to NBD (which currently doesn't support any encryption) 
which is (quite a bit) faster, and the tunneled migration function gets 
no love.

Likely that any encryption added to NBD will have the same performance 
degradation.

On 1/9/15 3:59 PM, Yagmur Akbulut wrote:
> We are working on nova live-migration using Ceph and trying to work
> around the problem where vm migration fails if name resolution is not
> enabled in a cluster. See the link,
>
> https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Virtualization_Host_Configuration_and_Guest_Installation_Guide/App_Migration_Address.html
>
> We have managed to work around this by setting the flag to include
> “VIR_MIGRATE_TUNNELLED”.
> However, it is noticebaly slower than non tunnelled.
>
> We were hoping that setting the listen_addr would get libvirt to return
> the listen_addr rather than the hostname but virGetHostname in
> libvirt/src/util/virutil.c doesn’t have access to the config structure.
>
> I was wondering if libvirt can be patched in a way to return the ip
> address of the destination instead of the hostname during migration?


-- 
Gary R Hook
Senior Kernel Engineer
NIMBOXX, Inc