Supervdsm allows vdsm to run root commands, like mount, dmidecode, lsblk, scan
folders that are unprivileged for vdsm user, and more. Due to this method we
avoid executing root commands using execv with sudo, that way we don't create
subprocess for each operation.
We have to have supervdsm as external deamon, as it runs as different user
(root, vdsm runs as user vdsm). Supervdsm deamon doesn't related to libvirt or
uses libvirt at all, most of supervdsm functionality is used by vdsm in
different flows. you can check supervdsm API in supervdsmServer.py and see
where we call it.
We need to have only one instance of supervdsm with a socket file under
/var/run/vdsm/ , supervdsm creates this file and vdsm communicate with it.
Due to your netstat output, most of the time you should have 2 or 3 entries
unix 2 [ ACC ] STREAM LISTENING 18895145
unix 2 [ ] STREAM CONNECTED 18895172
unix 3 [ ] STREAM CONNECTED 18895158
(multiprocessing package implementation, you can check there)
might be that other subprocesses or subthreads also hold a request to
svdsm.sock at the time you checked,
I don't understand the reason for /var/run/mcvda folder at all.. maybe you
changed something in the configuration? is it always appear? what else do you
have under this folder?
Normal run shouldn't have more entries as far as I checked.
In addition, I'm working on making supervdsm external service, you can take a
look and maybe help me with review :)
----- Original Message -----
> From: "bigclouds" <bigclo...@163.com>
> To: us...@ovirt.org
> Sent: Friday, April 26, 2013 9:59:47 AM
> Subject: [Users] questions about vdsm supervdsmserver
> i have 2 questions about supervdsmserver,
> 1.why it is created separately as a daemon?
> its many function have never been used, and its function can be done by
> calling libvirt directly, why supervdsmserver is need?
> 2.it seems that only one supervdsmserver should be exist, by killing old ones
> to assure that . but look at this, and please explain to me.
> unix 2 [ ACC ] STREAM LISTENING 1339963 4968/python /var/run/vdsm/svdsm.sock
> unix 2 [ ACC ] STREAM LISTENING 384165 39716/python &nb sp;
> unix 2 [ ACC ] STREAM LISTENING 1100509 49487/python /var/run/vdsm/svdsm.sock
> unix 2 [ ACC ] STREAM LISTENING 1326232 3813/python /var/run/mcvda/svdsm.sock
> unix 3 [ ] STREAM CONNECTED 1448193 4968/python /var/run/mcvda/svdsm.sock
> unix 3 [ ] STREAM CONNECTED 1447937 4968/python /var /run/mcvda/svdsm.sock
> unix 3 [ ] STREAM CONNECTED 1424959 4968/python /var/run/mcvda/svdsm.sock
> unix 3 [ ] STREAM CONNECTED 1414835 4968/python /var/run/mcvda/svdsm.sock
> unix 3 [ ] STREAM CONNECTED 1327873 3813/python /var/run/mcvda/svdsm.sock
> unix 2 [ ] STREAM CONNECTED 1309612 49487/python & nbsp;
> unix 3 [ ] STREAM CONNECTED 384221 39716/python /var/run/mcvda/svdsm.sock
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