Discuss August 2006

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269 participants
332 discussions

file i/o operations...
by bruce 25 Aug '06

25 Aug '06

hi... i'm trying to determine which is the better way/approach to go. should an app do a great deal of file i/o, or should it do a great deal of read/writes to a mysql db... my test app will create a number of spawned child processes, 1000's of simultaneous processes, and each child process will create data. the data will ultimately need to be inserted into a db. Approach 1 ----------- if i have each child app write to a file, i'm going to have a serious hit on the disk, for the file i/o, but i'm pretty sure Centos/RH could handle it. (although, to be honest, i don't know if there's a limit to the number of simultaneous file descriptors that the OS allows to be open at the same time.) i'm assuming that the number is multiples of magnitudes more than the number of simultaneous connections i can have with a db.... i could then have a process/app collect the information from each output file, writing the information to the db, and deleting the output files as required. Approach 2 ---------- i could have each child app write to a local db, with each child app, waiting to get the next open db connection. this is limited, as i'd run into the max connection limit for the db. i'd also have to implement a process to get the information from the local db, to the master db. .. Approach 3 ----------- i could have each child app write directly to the db.. the problem with this approach is that the db has a max regarding the number of simultaneous connections, based on system resources. this would be the cleanest solution.. so... anybody have any thoughts/comments as to how one can essentially accept 1000's-10000's of simultaneous hits with an app... i've been trying to find out if there's any kind of distributed parent/child/tiered kind of app, where information/data is more or less collected and received at the node level... thanks -bruce

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Re: rhel 4.4 perl update looses weakref support?
by Dag Wieers 25 Aug '06

25 Aug '06

On Wed, 23 Aug 2006, nathan r. hruby wrote: > On Thu, 24 Aug 2006, John Summerfield wrote: > > > nathan r. hruby wrote: > > > > > I have a user running RT on a RHEL4 machine. He recently did the RHEL4.4 > > > update and now it appears that the Tree::Simple module (a requirement of > > > RT) is broken, as it was built with weakref support that was in a prior > > > perl package and it appears that the new perl-5.8.5-36 package has lost > > > that support. > > > > > > Red Hat Bugzilla has nothing about this particular issue that I can find. > > > Anyone else experienced this? > > > > > > Obviously, we're an .edu and thus can't call support and actually expect > > > help. But before setting this user on bugzilla, I thought I'd ask if > > > anyone else might have any knowledge of this. The Best Practical RT Wiki > > > has some info on this, but evidently the user tried the suggestions there > > > with no luck. > > > > Why not check the changelong (rpm -q perl --changelong | less), and get the > > source rpm and check the spec file (you could compare with the previous > > version), and if needs bem build it the way you want? > > The changelog has nothing on this particular subject and I haven't had a > moment to peek at the source RPM's to see what has changed. > > I really don't want to rebuild and maintain a separate perl instance if I > don't have to ;-) It would be nice if the CentOS project had (and offered) a subversion repository where the SPEC file (and patches) of official SRPMs are stored (an tagged accordingly). This could be set up automatically and fed automatically. Having something like this would help a lot of people trace problems and it would help people rebuilding packages to see what changes have been made by Red Hat. Fastrack and beta packages would give a few of ongoing changes and people could subscribe to the "svn-commits" as the are being made. Of course, this would not hold the CentOS specific changes (or other CentOS related projects) only the upstream changes. Otherwise it would be harder to follow. If this sounds interesting, I'm willing to offer to design and implement this. PS Sorry for replying to a different mailinglist, I actually wrote this mail and luckily I noticed in time it was not on a CentOS related mailinglist. :) Kind regards, -- dag wieers, dag(a)wieers.com, http://dag.wieers.com/ -- [all I want is a warm bed and a kind word and unlimited power]

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Network interface fails after kernel upgrade
by Clive Gould 25 Aug '06

25 Aug '06

Hi Yum has just updated 5 of my Linux boxes running CentOS 4.3 to the 2.6.9-42 kernel. All is well on four of the boxes, but on the fifth the network card (eth0) will not work. I've downgraded the kernel to the previous version and the network card works fine again. I've tried removing and re-installing the new kernel, but the network card won't work with it. The details of the card are as follows: lspci:- 00:0e.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10) /etc/modprobe.conf:- alias eth0 8139too Any suggestions welcomed.. Thanks Clive

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yum update failed
by Jerry Geis 25 Aug '06

25 Aug '06

I am getting the following error on yum update. What do I do??? I have the ATI display driver package installed. --------------------------------------------- Running Transaction Test Finished Transaction Test Transaction Check Error: file /usr/X11R6/lib/libGL.so.1.2 from install of xorg-x11-Mesa -libGL-6.8.2-1.EL.13.37 conflicts with file from package fglrx64_6_8_0-8.16.20-1 file /usr/X11R6/lib/libGL.so.1.2 from install of xorg-x11-Mesa-libGL-6.8.2-1.EL.13.37 c onflicts with file from package fglrx64_6_8_0-8.20.8-1 file /usr/X11R6/lib64/libGL.so.1.2 from install of xorg-x11-Mesa-libGL-6.8.2-1.EL.13.37 conflicts with file from package fglrx64_6_8_0-8.16.20-1 [root@geisjcompaq src]# rpm -e xorg-x11-Mesa-libGL-6.8.2-1.EL.13.17 error: package xorg-x11-Mesa-libGL-6.8.2-1.EL.13.17 is not installed [root@geisjcompaq src]# rpm -qa | grep libGL xorg-x11-Mesa-libGL-6.8.2-1.EL.13.20 xorg-x11-Mesa-libGLU-6.8.2-1.EL.13.20 xorg-x11-Mesa-libGL-6.8.2-1.EL.13.20 [root@geisjcompaq src]# rpm -e xorg-x11-Mesa-libGL-6.8.2-1.EL.13.20 error: "xorg-x11-Mesa-libGL-6.8.2-1.EL.13.20" specifies multiple packages [root@geisjcompaq src]# -- Jerry

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CentOS-announce Digest, Vol 18, Issue 15
by centos-announce-request＠centos.org 25 Aug '06

25 Aug '06

Send CentOS-announce mailing list submissions to centos-announce(a)centos.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.centos.org/mailman/listinfo/centos-announce or, via email, send a message with subject or body 'help' to centos-announce-request(a)centos.org You can reach the person managing the list at centos-announce-owner(a)centos.org When replying, please edit your Subject line so it is more specific than "Re: Contents of CentOS-announce digest..." Today's Topics: 1. CESA-2006:0633 Moderate CentOS 3 i386 ImageMagick - security update (Tru Huynh) 2. CESA-2006:0633 Moderate CentOS 3 x86_64 ImageMagick - security update (Tru Huynh) 3. CESA-2006:0618 Important CentOS 4 axp apache - security update (Pasi Pirhonen) 4. CESA-2006:0618 Important CentOS 4 s390(x) apache - security update (Pasi Pirhonen) 5. CESA-2006:0618 Important CentOS 4 ia64 apache - security update (Pasi Pirhonen) 6. CESA-2006:0354 Low CentOS 4 axp elfutils - security update (Pasi Pirhonen) 7. CESA-2006:0354 Low CentOS 4 ia64 elfutils - security update (Pasi Pirhonen) 8. CESA-2006:0354 Low CentOS 4 s390(x) elfutils - security update (Pasi Pirhonen) 9. CESA-2006:0393 Low CentOS 4 axp ntp - security update (Pasi Pirhonen) 10. CESA-2006:0393 Low CentOS 4 ia64 ntp - security update (Pasi Pirhonen) 11. CESA-2006:0393 Low CentOS 4 s390(x) ntp - security update (Pasi Pirhonen) 12. CESA-2006:0582 Low CentOS 4 axp kdebase - security update (Pasi Pirhonen) 13. CESA-2006:0582 Low CentOS 4 ia64 kdebase - security update (Pasi Pirhonen) 14. CESA-2006:0582 Low CentOS 4 s390(x) kdebase - security update (Pasi Pirhonen) 15. CESA-2006:0605 Important CentOS 4 axp perl - security update (Pasi Pirhonen) 16. CESA-2006:0605 Important CentOS 4 ia64 perl - security update (Pasi Pirhonen) 17. CESA-2006:0605 Important CentOS 4 s390(x) perl - security update (Pasi Pirhonen) ---------------------------------------------------------------------- Message: 1 Date: Thu, 24 Aug 2006 14:57:17 +0200 From: Tru Huynh <tru(a)centos.org> Subject: [CentOS-announce] CESA-2006:0633 Moderate CentOS 3 i386 ImageMagick - security update To: centos-announce(a)centos.org Message-ID: <20060824125716.GA21252(a)sillage.bis.pasteur.fr> Content-Type: text/plain; charset="us-ascii" CentOS Errata and Security Advisory CESA-2006:0633 ImageMagick security update for CentOS 3 i386: https://rhn.redhat.com/errata/RHSA-2006-0633.html The following updated file has been uploaded and is currently syncing to the mirrors: i386: updates/i386/RPMS/ImageMagick-5.5.6-20.i386.rpm updates/i386/RPMS/ImageMagick-c++-5.5.6-20.i386.rpm updates/i386/RPMS/ImageMagick-c++-devel-5.5.6-20.i386.rpm updates/i386/RPMS/ImageMagick-devel-5.5.6-20.i386.rpm updates/i386/RPMS/ImageMagick-perl-5.5.6-20.i386.rpm source: updates/SRPMS/ImageMagick-5.5.6-20.src.rpm You may update your CentOS-3 i386 installations by running the command: yum update ImageMagick\* Tru -- Tru Huynh (CentOS-3 i386/x86_64 Package Maintenance) http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xBEFA581B

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Copying files from DOS environment based on archive bit
by Nigel Kendrick 25 Aug '06

25 Aug '06

Hi Folks, I've a Linux server that has a disk on a Windows NT-based machine mounted via samba so that it appears as /share/pd on the Linux box. I am trying to automate a backup procedure that pushes files from the NT disk to another site as a ZIP file using scp. All is working OK, but I'd now like to make the backup 'incremental' so can anyone think of a way I can grab files off the NT server based on whether their archive bit is set (and then clear the bit) - I can't see that the Linux ZIP command supports this and can't see a way of doing it with mtools. I might visit this afresh and host the data files on the Linux server in due course and then have a look at tar/dar/bacula, but for the moment they must stay where they are for various technical reasons. Any ideas?! Thanks Nigel Kendrick

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RE: [CentOS] OT: Help config a Cisco 2600
by Mark Schoonover 25 Aug '06

25 Aug '06

Mike Kercher wrote: > Can someone help me configure a Cisco 2600 offlist please? I have too > little experience with these things. > > Thanks! > > Mike Mike, Configure to do what?? It's pretty broad request, and Cisco IOS is quite complex... Sorry I can't help you more, but this may be a good time to find a local person you can hire to get it configured the way you need. Once it's configured, it's pretty much set unless you change your network. HTH Mark

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Postfix chroot jail - Centos 4
by Leonardo Vilela Pinheiro 25 Aug '06

25 Aug '06

As I can seen, there is the bind-chroot glue package, but is there a postfix-chroot.rpm glue ? I have looked for it, but I think there is not. If there is not, what is your opinion about creating one ? Thanks -- Vilela

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FreeNx for 64bit Kernel
by Rajeev R Veedu 25 Aug '06

25 Aug '06

Could some one guide me from where I can get freenx rpms and its dependencies (nx) for 64bit kernel? I have goggled quite a lot but did not see nx. Rpm for 64 bit. Thanks Rajeev

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make - perl - broken
by John Thomas 24 Aug '06

24 Aug '06

Could you help me trouble shoot this? I am a bit of a rookie and probably screwed something up. I am trying to "make" imapsync, but there is a complaint regarding some Perl problem that I cannot figure out. [root@testmail imapsync-1.182]# make Use of uninitialized value in concatenation (.) or string at /usr/lib/perl5/5.8.5/i386-linux-thread-multi/Scalar/Util.pm line 30. is only avaliable with the XS version at /usr/lib/perl5/vendor_perl/5.8.5/IO/Socket/SSL.pm line 19 BEGIN failed--compilation aborted at /usr/lib/perl5/vendor_perl/5.8.5/IO/Socket/SSL.pm line 19. Compilation failed in require at ./imapsync line 357. BEGIN failed--compilation aborted at ./imapsync line 357. imapsync , You can do : make install make testf make testv make all

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Discuss August 2006