FOG Multicasting Please Wait Issue



  • I have read the majority of threads over multicasting hanging up at the please wait screen. I could multicast successfully before I added in a new storage group with a new master node. I have two storage nodes located on the same fog server /storage1/images and /storage2/images. I have done the things that pertain to adding in a new storage node. Before my setup was one storage group with two nodes inside one being the master node ,/storage1/images. I removed /storage2/images from that group and made a new group. Then assigned /storage2/images as a master and did all the things to make it work. Changing the export file, adding in a dev file, doing touch command to make it mount properly. I can unicast from both storage nodes just fine, but when I try to multicast it just hangs on the please wait screen. Here is some information about my server.

    [CODE]uname -a
    Linux csimg01 3.0.0-12-server #20-Ubuntu SMP Fri Oct 7 16:36:30 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
    [/CODE]
    All three of my log files for multicast.log, fogschedular.log, and fogreplicator.log all say.
    [CODE]
    [07-18-13 11:55:06 am] * [07-18-13 11:55:06 am] Checking if I am the group manager.
    [07-18-13 11:55:06 am] * [07-18-13 11:55:06 am] I don’t appear to be the group manager, I will check back later.
    [07-18-13 11:55:16 am] * [07-18-13 11:55:16 am] Checking if I am the group manager.
    [07-18-13 11:55:16 am] * [07-18-13 11:55:16 am] I don’t appear to be the group manager, I will check back later.
    [/CODE]
    My /var/www/fog/commons/config.php and /opt/fog/service/etc/config.php both have the correct mysql login information. I also edited the max wait to 300
    The /etc/mysql/my.cnf has my ipaddress not 127.0.0.1, and I made sure that if you ssh into the server this code will work.
    [CODE]
    mysql -u<myuser> -p<mypassword> -h<myIPaddress>
    [/CODE]
    I have done the steps on this page,[url]http://fogproject.org/forum/threads/wiki-troubleshooting-multicast.22/[/url], and they work.
    It looks like I have the same problem as [URL=‘http://fogproject.org/forum/members/corey-cochran.1582/’][B]Corey Cochran[/B][/URL] on this page [url]http://fogproject.org/forum/threads/mulitcast-from-storage-node-problem.954/#post-4917[/url]


  • Developer

    [quote=“RoweAdmin, post: 28562, member: 23772”]I made the mistake of thinking there was a problem when only 1 client was connected and stuck on the Please Wait screen. After starting the second client, everything worked great.

    We are seeing speeds of 2Gb/s and more through an old Linksys/Cisco 16 port gigabit switch with 11 clients.[/quote]

    This is the nature of Multicast, it sends the same stream of data to ALL machines on the list and if one falls out the process will stall and fail. You need all machines to stay in constant contact with your FOG server during imaging. Multicast waits until each client reaches the “checkpoint” before sending any more data. This is typically sower than unicast because it will decompress the image at the server to send out, rather than waiting until it reaches its destination and expanding.



  • I made the mistake of thinking there was a problem when only 1 client was connected and stuck on the Please Wait screen. After starting the second client, everything worked great.

    We are seeing speeds of 2Gb/s and more through an old Linksys/Cisco 16 port gigabit switch with 11 clients.



  • also… try restarting the multicast service… sounds trivial, but when multicast bombs for me… (ie stuck on the please wait screen) I restart the service and it works…


  • Senior Developer

    When you’re accessing your mysql server, are you accessing it from the IP Address of the system (Not 127.0.0.1 or localhost)? As you’ve makde sure the binding address is not 127.0.0.1, you may want to make sure your config.php files (in both locations) are set to the ip address of your fog server.

    I don’t know if this is your exact case, but I’d give this a shot first.


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