Udpcast May 2003

udpcast@udpcast.linux.lu

10 participants
10 discussions

Udpcast 20030524 alpha release
by Alain Knaff 28 May '03

28 May '03

A new alpha release of udpcast is ready on http://udpcast.linux.lu/20030524 It fixes a bug with network modules which were not directly in the drivers/net directory, but rather in one of its subdirectories. Impacted were e100, e1000, tulip, some pcmcia drivers, and some wireless drivers. Moreover, the new version now supports the lzop compressor, which is faster than gzip. There is now also support for ipmac files to make it possible to "automatically" attribute IP addresses to the various receivers even without a DHCP server. For this, simply place an ipmac.txt file into the root of the boot floppy, whith the mac to ip mapping. Example: # Udpcast IP/Mac association file 00:5B:56:4b:42:9a 10.0.0.176 00:50:56:40:42:97 10.0.0.177 00:50:56:40:42:98 10.0.0.178 This means that the machine with the MAC address 00:5B:56:4b:42:9a should get IP 10.0.0.176, etc. Have fun, Alain

4 8

adding functions
by Chris Locke 27 May '03

27 May '03

I am planning on using udpcast to do linux installs on the computer systems we manufacture. But I have a couple of questions. We have machines that come with different sizes of hard drives. 20, 40 and 80 gigs. In the past we had a script we would run on a duplicating machine that would dd a 6 gig installation with a small swap and then run parted to resize for the appropriate drive. I created a script that will grep /proc/ide/hdc/geometry and determine what size drive it is so it could run the correct parted command. Now we want to be able to do duplication in much bigger numbers and after lots of research I have decided on udpcast. Here is where my problem is. We tested a 5 machine duplication on a 10/100 switch seperated from our network with the 20 gig drives. It took around an hour. So we figure that that time will only double when we move to 40 gig and the double again for 80 gig. What I would like to do is just transfer the 6gig install and then run parted like before to resize the partitions. I would also like it to use my drive sensing script so that no user intervention is required. I had made a special knoppix boot disk that would auto boot and run my parted scripts but that would require us to use more than one cd. My boss wants it to be really easy, so that the guys who build the system can just pop the cd in and walk away, come back in 30 minutes and everything is done. no commands or anything necessary. I know this should be able to be done but honestly I have no idea how. What do you guys think? -- Chris Locke Stratitec IT

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UDPCast with the e1000.o module
by Ian Oliver 26 May '03

26 May '03

I'm a big fan of the UDPCast application. I used it on Monday to clone a computer lab on my campus. The lab has 25 pc's and it only took around 2 hours to clone the whole lab. I am having a problem though. We recently purchased new PC's with Gigabit network cards (Intel E1000). I can't get UPDCast to work with our new NIC's. I've tried to build UDPCast with the e1000.o module, but I wasn't successful. I really don't know enough about Linux to know where I went wrong, but I think it's something to do with the driver being written for a different kernel then the UDPCast kernel. I just hoping someone else has built a Boot Disk with the e1000.o module and could send me instructions or the disk. Thank you for taking the time to read this post. Any help is appericated. Ian __________________________________ Do you Yahoo!? The New Yahoo! Search - Faster. Easier. Bingo. http://search.yahoo.com

3 6

Udpcast 20030517 compilation problem..
by Saikrishna Dasari 22 May '03

22 May '03

Hi Alain, When I am trying to cmpile the sources (udpcast-200317.tar.gz) it is complaing about a file names "libb_udpcast.h". There is no file with this name in the sources provided. I guess a function names xmalloc() in the pregram needs this file. the rpm version and CD version they just seem to be fine. I just wanted to coney this message to you. Thanks, SAI __________________________________ Do you Yahoo!? The New Yahoo! Search - Faster. Easier. Bingo. http://search.yahoo.com

2 1

Updcast 20030517
by Alain Knaff 18 May '03

18 May '03

The 20030517 release is now ready, and can be found at the following URLs: http://udpcast.linux.lu/20030517 Here a small summary of the changes of udpcast itself: - min-clients/min-wait/max-wait/nokbd flags for unattended sender operation - fix for "press any key" (it's now really any key, not just return) - keyboard start also works when getting data file from stdin (by opening /dev/tty) (unless --nokbd is specified, of course...) - misc bugfixes (robustness against bad packets, ...) And here are the changes for the boot loader: - it's no longer based on the SuSE boot disks. This should make it easyer to compile for those of you who don't have access to a SuSE system. - The new system also makes it easyer to upgrade to new kernels. - There is now a boot image maker, which makes it easyer to build boot floppies with exactly those network modules that you need - Single floppy boot for most network cards - autodetection of PCI network cards - Support for PXE and Etherboot After a bit of testing I'll move it to the main page. Regards, Alain

1 0

udp-cast to a file
by lance.grover 12 May '03

12 May '03

Well we have overcome our unknown problem with udp-casting to a file. Just for a reminder, we were having troubles with Image files getting bigger than 2 Gig using the '-f' option. The problem was not our file system, we tried several different, nor did our Kernal not support LFS. The workaround started with trying to split the file into 2 Gig portions then 'cat' them back together into one big file, but then we couldn't send the file, we got an error message saying the file was to big. So we came up with the following workaround: To receive to a file from a regular udp-sender piped through lzop or gzip: udp-receiver > filename.lz To send the image file we use: udp-sender --autostart 1 -p "cat filename.lz" The autostart option is important because with our system for some reason we can not start it manually and we cannot pipe it using '<' because it freezes the program, but by auto starting it gets around that for us. We really love udp-cast, we have compared it to several other programs some under the GPL and some not, and this is the best and fastest for what we need. My complements to you Alain. Lance Grover ************************************* This e-mail may contain privileged or confidential material intended for the named recipient only. If you are not the named recipient, delete this message and all attachments. Unauthorized reviewing, copying, printing, disclosing, or otherwise using information in this e-mail is prohibited. We reserve the right to monitor e-mail sent through our network. *************************************

1 0

Reliabiltiy
by Gianni Minetti 12 May '03

12 May '03

Hi. I'm evaluating the feasibility to use udp-cast as a reliable multicast file transfert protocol over a satellite link in order to distribute spooled db's differences. Do you know any application of udp-cast over satellite links? Are there any statistic model that better describe the reliability of udp-cast? What about udp-cast and the emerging pgm protocol (aka Tibco). Thanks a lot in advance for your interest and answers, GM #include <disclaimer.h> / * GIOVANNI MINETTI, system administrator of my own * net: gianni(a)gminetti.net * voice(1) +39 335 608 7857 * voice(2) +41 79 2200887 * Fax +39 178 601 3081 * PGP key on keyservers * F.prn = 7C02 59B8 549D 658E 2FA3 0EB4 CB39 1984 5DC2 8151 * UNIX is user friendly. It's just selective about who its friends are" (anonymous) /

2 1

save to file
by Nathaniel Sbar 12 May '03

12 May '03

Just a simple question from a simple user. Lance Grover was talking about sending a disk to an image file on a server. Well, I have an external hard drive and I've been using dd and gzip to make images on the external drive, but I was hoping somebody out there could give me a quick tutorial on how to pipe udpcast to do the same thing because dd is really slow. Nate Sbar. __________________________________ Do you Yahoo!? The New Yahoo! Search - Faster. Easier. Bingo. http://search.yahoo.com

2 1

Udpcast source code analysis...
by Saikrishna Dasari 09 May '03

09 May '03

Hi Friends, I am trying to understand the UDPCast source code. Can anybody explain me the producer/consumer concept in the source code both on sender and receiver's side ?? Thanks , Sai __________________________________ Do you Yahoo!? The New Yahoo! Search - Faster. Easier. Bingo. http://search.yahoo.com

2 1

UDP-cast
by lance.grover 02 May '03

02 May '03

I am really impressed with UDP-cast and I use it quite frequently. I use it to copy partitions of aproximatly 70 Gig for so far up to 5 computers at a time, in the future that number will increase to about 30, if possible. My colegues and I have set up a server where we would like to store older versions of this image that we cast out. I tried first of all just to send the image strait to a file, and that works if the file stays below 2Gig but once it reaches that size the operation crashes, stating the file is too big. I am a bit confused by this since we are running Red Hat 8 and Large File support comes with it. A partial workaround is by piping the split command through udp-cast, where I can limit the splits to 2Gig each, this works good and I can even concatinate the files into one large image file, but when the file is already larger than 2Gig then I cannot send it with UDP-cast, I get a message that the file is too large. My question to you is: is there something in the code that is causing the size issue or is it in a library that is used in the code. In other words is there a good workaround? Again I want to tell you thanks for the program and thanks for any help you can give me. -Lance Grover ************************************* This e-mail may contain privileged or confidential material intended for the named recipient only. If you are not the named recipient, delete this message and all attachments. Unauthorized reviewing, copying, printing, disclosing, or otherwise using information in this e-mail is prohibited. We reserve the right to monitor e-mail sent through our network. *************************************

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Udpcast May 2003