Multicast Not Working Via Groups



  • Hello, and excuse me if this has already been answered. I’ve seen lots of multicasting issues on here, but none quite answering the issue I’m having.

    Setup:
    Ubuntu 18.04.2
    FOG 1.5.5

    I have successfully set up a Multicast session via the Multicast Image item under Image Management. I set up the session name, number of clients, timeout, image, and start session and clients join the session and things go well.

    However, when I try to run a Multicast session via the Groups (select the group, Basic Tasks, select Multicast and task it), the session never deploys. The clients hang at the blue screen for deployment, but nothing happens. Furthermore, the database now says that the image I was trying to deploy now has a size 0.00 iB on the listing of images (Image 9 below).

    ![alt text](Screenshot from 2019-07-19 14-40-11.png image url)

    Checking on the server, the files for the image are very much still there:

    /images/20190702_w10_1804_256# ll
    total 55561528
    drwxrwxrwx  2 root root        4096 Jul  2 14:38 ./
    drwxrwxrwx 17 fog  root        4096 Jul 18 13:55 ../
    -rwxrwxrwx  1 root root     1048576 Jul  2 14:06 d1.mbr*
    -rwxrwxrwx  1 root root         371 Jul  2 14:06 d1.original.uuids*
    -rwxrwxrwx  1 root root      175688 Jul  2 14:06 d1p1.img*
    -rwxrwxrwx  1 root root    14795221 Jul  2 14:06 d1p2.img*
    -rwxrwxrwx  1 root root      254129 Jul  2 14:07 d1p3.img*
    -rwxrwxrwx  1 root root 46372016892 Jul  2 14:32 d1p4.img*
    -rwxrwxrwx  1 root root 10506672918 Jul  2 14:38 d1p5.img*
    -rwxrwxrwx  1 root root         955 Jul  2 14:06 d1.partitions*
    

    First, how can I get the multicast to work via Groups (which is OK, I can set it up the other way, but it seems it should work this way as well)?

    Second, how can I get my image back so the front end knows it’s there and not 0.00 iB in size?

    Thanks
    Tim Lehrian


  • Developer

    @tlehrian It’s usually good to open new topics on different issues. People will find answers more easily and hopefully be able to help themselves using the forum search. We’ll discuss this other topic here as well but I just want to encourage you to open as many topics as you have issues. There is no limit.

    I’m running into another error that Restoring GPT Partition Tables failed (see pic).

    We were able to track down an issue that sounds very similar last week. Find the details here: https://forums.fogproject.org/topic/13440/fog-1-5-6-auto-resize-is-unpredictable

    To try the fixed binaries download 64 Bit and 32 Bit and put those in /var/www/html/fog/service/ipxe/ dir on your FOG server. Probably good to rename the original ones instead of overwriting.

    Ok, back to the initial multicast topic: The log you posted seems fine from my point of view. There is no message saying "This is not the master node.” as you mentioned before.

    If you seem to have problems with multicasting I’d advise you to try and not spawn new sessions before you made sure the old one is completely terminated. Take a look at the logs as well as run ps ax | grep 'udp-sender' (make sure you use single quotes here!) to see if some left overs are still running. If so you want to terminate those processes (killall udp-sender).

    Edit: Just had another thought on the “This is not the Master Node” message: Please read this: https://github.com/FOGProject/fogproject/issues/268



  • @Sebastian-Roth So attached is the multicast.log file after restarting the Multicast service on the server. multicastlog.txt

    I’m running into another error that Restoring GPT Partition Tables failed (see pic).

    IMG_20190725_143623 (1).jpg

    This error is particularly annoying because it happens intermittently, not every time you try to image to a particular machine. This is on an HP Z2 G4 workstation with two M.2 drives installed. I have successfully imaged to these computers a few times already.



  • @Sebastian-Roth I have had opportunity to start another multicast via Groups, and it did not work. This time, in the multicast.log, there are entries saying “This is not the master node.” What’s going on? I have made no configuration changes to the fog server.


  • Developer

    @tlehrian Thanks for the update. Definitely keep us posted if you see it happen again. Always good if you provide the logs then.

    Will mark this solved for now but feel free to just post here again!



  • @Sebastian-Roth I just wanted to follow up with this from last week. I subsequently tried running a multicast session set up via the Groups (with another group), and it worked. Twice. I’m not sure what caused the hiccup on the one last week. I’m willing to let this go as an anomaly for now, but will follow up on this if I run into the issue again.



  • @Sebastian-Roth Interesting to know that’s how the image is calculated… In my update I did mention the size has now recovered back after deploying the image to another machine.

    When I did not get the group multicast to work, I restarted the service on the server, so I think that reset the log file. All entries on it are from after I restarted the service. I’ll retry another multicast via groups next week (time running out on me today) and post the requisite log file after doing that.

    Having said that, I have run another multicast session (not via groups) and the output follows:

    [07-19-19 6:30:14 pm] 
    ==================================
    ===        ====    =====      ====
    ===  =========  ==  ===   ==   ===
    ===  ========  ====  ==  ====  ===
    ===  ========  ====  ==  =========
    ===      ====  ====  ==  =========
    ===  ========  ====  ==  ===   ===
    ===  ========  ====  ==  ====  ===
    ===  =========  ==  ===   ==   ===
    ===  ==========    =====      ====
    ==================================
    ===== Free Opensource Ghost ======
    ==================================
    ============ Credits =============
    = https://fogproject.org/Credits =
    ==================================
    == Released under GPL Version 3 ==
    ==================================
    
    
    [07-19-19 6:30:14 pm] Interface Ready with IP Address: 10.121.77.10
    [07-19-19 6:30:14 pm] Interface Ready with IP Address: 127.0.0.1
    [07-19-19 6:30:14 pm] Interface Ready with IP Address: 127.0.1.1
    [07-19-19 6:30:14 pm] Interface Ready with IP Address: 216.162.61.10
    [07-19-19 6:30:14 pm] Interface Ready with IP Address: newfog.cs.local
    [07-19-19 6:30:14 pm] Interface Ready with IP Address: tu-216-162-61-10.taylor.edu
    [07-19-19 6:30:14 pm]  * Starting MulticastManager Service
    [07-19-19 6:30:14 pm]  * Checking for new items every 10 seconds
    [07-19-19 6:30:14 pm]  * Starting service loop
    [07-19-19 6:30:15 pm]  * No new tasks found
    (...snipped...)
    [07-19-19 7:43:45 pm]  * No new tasks found
    [07-19-19 7:43:55 pm]  * No new tasks found
    [07-19-19 7:44:05 pm]  | Task ID: 11 Name: 229 is new
    [07-19-19 7:44:05 pm]  | Task ID: 11 Name: 229 image file found, file: /images/20190702_w10_1804_256
    [07-19-19 7:44:05 pm]  | Task ID: 11 Name: 229 11 clients found
    [07-19-19 7:44:05 pm]  | Task ID: 11 Name: 229 sending on base port 57192
    [07-19-19 7:44:05 pm]  | Command: /usr/local/sbin/udp-sender --interface eno1 --min-receivers 11 --max-wait 600 --portbase 57192 --full-duplex --ttl 32 --nokbd --nopointopoint --file /images/20190702_w10_1804_256/d1p1.img;/usr/local/sbin/udp-sender --interface eno1 --min-receivers 11 --max-wait 10 --portbase 57192 --full-duplex --ttl 32 --nokbd --nopointopoint --file /images/20190702_w10_1804_256/d1p2.img;/usr/local/sbin/udp-sender --interface eno1 --min-receivers 11 --max-wait 10 --portbase 57192 --full-duplex --ttl 32 --nokbd --nopointopoint --file /images/20190702_w10_1804_256/d1p3.img;/usr/local/sbin/udp-sender --interface eno1 --min-receivers 11 --max-wait 10 --portbase 57192 --full-duplex --ttl 32 --nokbd --nopointopoint --file /images/20190702_w10_1804_256/d1p4.img;/usr/local/sbin/udp-sender --interface eno1 --min-receivers 11 --max-wait 10 --portbase 57192 --full-duplex --ttl 32 --nokbd --nopointopoint --file /images/20190702_w10_1804_256/d1p5.img;
    [07-19-19 7:44:05 pm]  | Task ID: 11 Name: 229 has started
    [07-19-19 7:44:15 pm]  | Task ID: 11 Name: 229 is already running with pid: 20229
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    [07-19-19 8:08:45 pm]  | Task ID: 11 Name: 229 is new
    [07-19-19 8:08:45 pm]  | Task ID: 11 Name: 229 image file found, file: /images/20190702_w10_1804_256
    [07-19-19 8:08:45 pm]  | Task ID: 11 Name: 229 11 clients found
    [07-19-19 8:08:45 pm]  | Task ID: 11 Name: 229 sending on base port 57192
    [07-19-19 8:08:45 pm]  | Command: /usr/local/sbin/udp-sender --interface eno1 --min-receivers 11 --max-wait 600 --portbase 57192 --full-duplex --ttl 32 --nokbd --nopointopoint --file /images/20190702_w10_1804_256/d1p1.img;/usr/local/sbin/udp-sender --interface eno1 --min-receivers 11 --max-wait 10 --portbase 57192 --full-duplex --ttl 32 --nokbd --nopointopoint --file /images/20190702_w10_1804_256/d1p2.img;/usr/local/sbin/udp-sender --interface eno1 --min-receivers 11 --max-wait 10 --portbase 57192 --full-duplex --ttl 32 --nokbd --nopointopoint --file /images/20190702_w10_1804_256/d1p3.img;/usr/local/sbin/udp-sender --interface eno1 --min-receivers 11 --max-wait 10 --portbase 57192 --full-duplex --ttl 32 --nokbd --nopointopoint --file /images/20190702_w10_1804_256/d1p4.img;/usr/local/sbin/udp-sender --interface eno1 --min-receivers 11 --max-wait 10 --portbase 57192 --full-duplex --ttl 32 --nokbd --nopointopoint --file /images/20190702_w10_1804_256/d1p5.img;
    [07-19-19 8:08:45 pm]  | Task ID: 11 Name: 229 has started
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    [07-19-19 8:08:55 pm]  | Task ID: 11 Name: 229 is now completed
    [07-19-19 8:09:05 pm]  * No new tasks found
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  • Developer

    @tlehrian Please take a look at the log file in /var/log/fog/multicast.log on your FOG server and post the full log here.

    The size you see in the web UI is being updated when the image is being captured or deployed. I’d need to take a look at the code why this was implemented the way it can happen to be set to zero when the session is not properly finished. But don’t worry, your image won’t ever be lost when you simply deploy it to a machine.



  • UPDATE: I decided to attempt to deploy the image to one machine without multicasting. It worked, and the image size updated.

    Then, I decided to deploy to the rest of the computers in that lab via the multicasting method I’d used before that worked (setting up a Multicast session not via groups, and join the computers to that session), and it seems to be working.

    SO…It seems we either have something set up incorrectly, or running a multicast image via Groups is not functioning.


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