Problems multicasting fog on different vlans
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@Yamakazi Well if no password is set, root should have permission. Also - if root didn’t have permission, the fog web interface wouldn’t even work, as it uses local root access to MySQL.
Check if you have a password set on the DB, the credentials FOG uses to access it are in
/opt/fog/.fogsettingsAlso, you can check what’s set inside of config.class.php:
cat /var/www/html/fog/lib/fog/config.class.phpAdditional reading:
https://wiki.fogproject.org/wiki/index.php?title=Password_Central
and
https://wiki.fogproject.org/wiki/index.php?title=Troubleshoot_MySQL -
I did a fresh install and managed to get multicast working in the same subnet but not in different vlans.
This is what i get when i’m in the database excuting those commands.
The .fogsettings file seems to be empty?
Config file is below
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@Yamakazi Just a guess, but try manually typing those commands, since I’m guessing mysql only accepts either ` or ’ and not both.
Could also simply do
TRUNCATE TABLE multicastSessions; TRUNCATE TABLE multicastSessionsAssoc; DELETE FROM tasks WHERE taskTypeID=8;if you don’t care about any current multicast tasks.
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I Made a new very basic setup with just the fog server a router and a host. I configured the router to allow multicast.
I get the same result, everything is working: dhcp, unicast etc. Just not multicast. So i think fog is causing the problems. I’m just really lost what is wrong. FOGMulticastmanger is active and working, the multicast settings in the webinterface are all correct. Dhcp and the image are working fine. Mysql still remains a mystery to me though. I’ve got no experiecne with it on linux so.
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From one of the wiki pages of fog it makes you check these files.
“Check the MySQL details in “/opt/fog/service/etc/config.php” are correct.
If not, correct them (they should be the same as in /var/www/fog/commons/config.php) and restart the service”
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this can’t be right. There is not much in the first config.php file and the 2nd under commons doesn’t even exist.
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@Yamakazi That wiki is outdated due to relatively recent changes I believe
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@Yamakazi said:
FOGMulticastmanger is active and working, the multicast settings in the webinterface are all correct.
Checked the multicast.log? Do you see udp-sender processes in
ps ax | grep udp?I might be wrong but I feel that this is not a general FOG issue as we have a lot of users who are running multicast imaging just fine. What if you connect one FOG server and two or three clients just with one simple dumb mini switch? Not router!
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@Yamakazi Also, your syntax is indeed wrong.
You need to do
use fog;first. Then try and run those other commands after that.
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UDP running
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This is to different vlan. Is it normal it broadcasts to 224.0.0.1? Because i see in wireshark it doesn’t get further than the first router it encounters on 224.0.0.1 (see pic a few posts back)
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To the same subnet multicast is working properly.
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Was also able to clear mysql database but to no avail.
I already tested the setup in the same subnet and that works. I’m just don’t seems to get it to work on different subnets.
How does fog multicast? to which multicast address? Does it make a multicast address and lets clients join it? or is it a set multicast address? Because it’s sending to 224.0.0.1 atm, which seems a bit weird.
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Alright it seems it has something to do with multicasting groups not properly reporting to eachother.
When fog starts a multicast session it send to 224.0.0.1 but it stops there and doesn’t get forwarded to other clients in different subnets
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When in the same subnet, It manges to request to join that specific multicast group get the data en then again leaves the mcast group.
Though it’s doing this directly with the fog server and not trough the general 224.0.0.1 which normally request host to join or leave a group.
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I know this is maybe not that fog related anymore, but we came this far already
Hosts in a different vlan listen to 224.0.0.1 to report their status. For example
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Is it possible to change the multicast adress of fog somewhere? to something different then 224.0.0.1 ?
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@Yamakazi You can specify the multicast address, but not the broadcast address I think. This seems like a routing issue, not a FOG problem, but I don’t really know enough about networking to say for sure.
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Where could i change the multicast adress? Haven’t seen it anywhere in the options.
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@Yamakazi Under Multicast settings - FOG_MULTICAST_ADDRESS default value is 0
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@Yamakazi I’m guessing you’re on FOG 1.2 then? Not on trunk? Might be worth upgrading and see if that helps.
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I’m not sure that 1.2.0 or trunk can multicast to more than one address. In 1.2.0 it uses the broadcast address of the broadcast domain the server resides in. In trunk, the same is true unless you define a custom address.
You can setup some custom multicast handling if you want, and have that traffic sent throughout your organization - but there’s no easy way to swap destination addresses easily in 1.2.0. Even with FOG Trunk it’ll be repetitive but doable.
You will need to figure out how to handle the traffic on your switches and routers.
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@Yamakazi Good finds! Check out udp-sender’s man page and you’ll see options like
--mcast-rdv-addressand--mcast-data-address. I guess you could play with those and patch your PHP files in FOG 1.2.0 to achieve this. On the other hand I think this shouldn’t be need as multicast addresses ought to be “universal” and not depend on IP addresses used in the subnets. But possibly I just don’t know enough about multicast. What I know is that we were using multicast for three different subnets (separated via VLANs!) at my old working place. Worked like a charm after I had setup the multicast routing stuff on all the switches properly. Unfortunately I can’t remember all those settings in detail as this was years ago.
