[pve-devel] live migration problems

Alexandre DERUMIER aderumier at odiso.com
Mon Sep 3 10:48:39 CEST 2012


>># lsof |grep /var/run/qemu-server/103.qmp 
>>kvm 110639 root 3u unix 0xffff88006735af00 0t0 422078 /var/run/qemu-server/103.qmp 
>>kvm 110639 root 56u unix 0xffff880061d1c580 0t0 424078 /var/run/qemu-server/103.qmp 
>>
>>No idea why there are two open FDs, both owned by process 110639? 
>>
>>I tried to connect with socat 
>>
>># socat - /var/run/qemu-server/103.qmp 
>>
>>and that simply blocks. 
>>
>>Any ideas? 

I have done some tests with qmp and qemu-ga socket,

It seem that we can do multiple connections and send query, but response occur only on one connection at time.
lsof show 2 open FD, when first connection is open.



example (with qemu-ga):

#lsof
-----
kvm        63541       root    4u     unix 0xffff8804237dcf80        0t0    3953934 /var/run/qemu-server/115.qga


established first connection

#socat unix-connect:/var/run/qemu-server/115.qga readline

#lsof
-----
kvm        63541       root    4u     unix 0xffff8804237dcf80        0t0    3953934 /var/run/qemu-server/115.qga
kvm        63541       root   37u     unix 0xffff88042a556b00        0t0    3959438 /var/run/qemu-server/115.qga



established second connection

#socat unix-connect:/var/run/qemu-server/115.qga readline
#lsof
-----
kvm        63541       root    4u     unix 0xffff8804237dcf80        0t0    3953934 /var/run/qemu-server/115.qga
kvm        63541       root   37u     unix 0xffff88042a556b00        0t0    3959438 /var/run/qemu-server/115.qga


#send command to second connection
----------------------------------
{"execute":"guest-ping"}
--> waiting response



#send command to first connection
----------------------------------
{"execute":"guest-ping"}
{"return": {}}  --> response


#close first connection
------------------------
second connection receive response : {"return": {}}  -




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