Discuss May 2011

discuss@lists.centos.org

225 participants
153 discussions

OT: Why VM?
by James B. Byrne 30 May '11

30 May '11

I have been working off and on with Xen and KVM on a couple of test hosts for that past year or so and while now everything seems to function as expected, more or less, I find myself asking the question: Why? We run our own servers at our own sites for our own purposes. We do not, with a few small exceptions, host alien domains. So, while rapidly provisioning or dynamically expanding a client's vm might be very attractive to a public hosting provider that is not our business model at all. Why would a small company not in the public hosting business choose to employ VM technology? What are the benefits over operating several individual small form factor servers or blades instead? I am curious because what I can find on the net respecting VM use cases, outside of for public providers or application testing, seems to me mostly puff and smoke. This might be considered OT but since CentOS is what we use it seems to me best that I ask here to start. -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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Re: [CentOS] Where is the Centos Linux 5.5 kernel syscall handler for mmap? (Keith Roberts)
by Frank Chang 29 May '11

29 May '11

Keith Roberts, Thank you for your suggestion about doing a grep of the source code. We found mmap.S in ../sysdeps/unix/sysv/linux/i386. We looked in mmap.S and found a lot of assembly code. Could you please tell us if any of the assembly code call the kernel syscall handler for mmap.s? Also, we ran make for the kernel Makefile and we obtained the following result shown below. Could you please suggest us how to fix the kernel Makeconfig so that it skips over libc_pic.os? Thank you for your help. gcc -shared -static-libgcc -Wl,-O1 -Wl,-z,defs -Wl, -dynamic-linker=/home/frankc/DQT1/glibc-2.9/lib/ld-linux.so.2 -B/home/frankc/DQTTest5/csu/ -Wl, --version-script=/home/frankc/DQTTest5/libc.map -Wl,-soname=libc.so.6 -Wl,-z,combreloc -Wl,-z,relro -Wl,--hash-style=both -nostdlib -nostartfiles -e __libc_main -L/home/frankc/DQTTest5 -L/home/frankc/DQTTest5/math -L/home/frankc/DQTTest5/elf -L/home/frankc/DQTTest5/dlfcn -L/home/frankc/DQTTest5/nss -L/home/frankc/DQTTest5/nis -L/home/frankc/DQTTest5/rt -L/home/frankc/DQTTest5/resolv -L/home/frankc/DQTTest5/crypt -L/home/frankc/DQTTest5/nptl -Wl, -rpath-link=/home/frankc/DQTTest5:/home/frankc/DQTTest5/math:/home/frankc/DQTTest5/elf: /home/frankc/DQTTest5/dlfcn:/home/frankc/DQTTest5/nss:/home/frankc/DQTTest5/nis: /home/frankc/DQTTest5/rt:/home/frankc/DQTTest5/resolv:/home/frankc/DQTTest5/crypt: /home/frankc/DQTTest5/nptl -o /home/frankc/DQTTest5/libc.so -T /home/frankc/DQTTest5/shlib.lds /home/frankc/DQTTest5/csu/abi-note.o /home/frankc/DQTTest5/elf/soinit.os /home/frankc/DQTTest5/libc_pic.os / home/frankc/DQTTest5/elf/sofini.os /home/frankc/DQTTest5/elf/interp.os /home/frankc/DQTTest5/elf/ld.so -lgcc /home/frankc/DQTTest5/libc_pic.os: In function `__libc_fork': /home/frankc/DQT1/glibc-2.9/posix/../nptl/sysdeps/unix/sysv/linux/i386/../fork.c:79: undefined reference to `__sync_bool_compare_and_swap_4' /home/frankc/DQTTest5/ gcc -shared -static-libgcc -Wl,-O1 -Wl,-z,defs -Wl, -dynamic-linker=/home/frankc/DQT1/glibc-2.9/lib/ld-linux.so.2 -B/home/frankc/DQTTest5/csu/ -Wl, --version-script=/home/frankc/DQTTest5/libc.map -Wl,-soname=libc.so.6 -Wl,-z,combreloc -Wl,-z,relro -Wl,--hash-style=both -nostdlib -nostartfiles -e __libc_main -L/home/frankc/DQTTest5 -L/home/frankc/DQTTest5/math -L/home/frankc/DQTTest5/elf -L/home/frankc/DQTTest5/dlfcn -L/home/frankc/DQTTest5/nss -L/home/frankc/DQTTest5/nis -L/home/frankc/DQTTest5/rt -L/home/frankc/DQTTest5/resolv -L/home/frankc/DQTTest5/crypt -L/home/frankc/DQTTest5/nptl -Wl, -rpath-link=/home/frankc/DQTTest5:/home/frankc/DQTTest5/math:/home/frankc/DQTTest5/elf: /home/frankc/DQTTest5/dlfcn:/home/frankc/DQTTest5/nss:/home/frankc/DQTTest5/nis: /home/frankc/DQTTest5/rt:/home/frankc/DQTTest5/resolv:/home/frankc/DQTTest5/crypt: /home/frankc/DQTTest5/nptl -o /home/frankc/DQTTest5/libc.so -T /home/frankc/DQTTest5/shlib.lds /home/frankc/DQTTest5/csu/abi-note.o /home/frankc/DQTTest5/elf/soinit.os /home/frankc/DQTTest5/libc_pic.os / home/frankc/DQTTest5/elf/sofini.os /home/frankc/DQTTest5/elf/interp.os /home/frankc/DQTTest5/elf/ld.so -lgcc /home/frankc/DQTTest5/libc_pic.os: In function `__libc_fork': /home/frankc/DQT1/glibc-2.9/posix/../nptl/sysdeps/unix/sysv/linux/i386/../fork.c:79: undefined reference to `__sync_bool_compare_and_swap_4' /home/frankc/DQTTest5/libc_pic.os: In function `__nscd_drop_map_ref': /home/frankc/DQT1/glibc-2.9/nscd/nscd-client.h:320: undefined reference to `__sync_fetch_and_add_4' /home/frankc/DQTTest5/libc_pic.os: In function `nscd_getpw_r': /home/frankc/DQT1/glibc-2.9/nscd/nscd_getpw_r.c:232: undefined reference to `__sync_fetch_and_add_4' /home/frankc/DQTTest5/libc_pic.os: In function `__nscd_drop_map_ref': /home/frankc/DQT1/glibc-2.9/nscd/nscd-client.h:320: undefined reference to `__sync_fetch_and_add_4' /home/frankc/DQTTest5/libc_pic.os: In function `nscd_getgr_r': /home/frankc/DQT1/glibc-2.9/nscd/nscd_getgr_r.c:321: undefined reference to `__sync_fetch_and_add_4' /home/frankc/DQTTest5/libc_pic.os: In function `__nscd_drop_map_ref': /home/frankc/DQT1/glibc-2.9/nscd/nscd-client.h:320: undefined reference to `__sync_fetch_and_add_4' /home/frankc/DQTTest5/libc_pic.os:/home/frankc/DQT1/glibc-2.9/nscd/nscd_gethst_r.c:400: more undefined references to `__sync_fetch_and_add_4' follow /home/frankc/DQTTest5/libc_pic.os: In function `__nscd_get_map_ref': /home/frankc/DQT1/glibc-2.9/nscd/nscd_helper.c:431: undefined reference to `__sync_val_compare_and_swap_4' /home/frankc/DQTTest5/libc_pic.os: In function `*__GI___libc_freeres': /home/frankc/DQT1/glibc-2.9/malloc/set-freeres.c:39: undefined reference to `__sync_bool_compare_and_swap_4' collect2: ld returned 1 exit status : In function `__nscd_drop_map_ref': /home/frankc/DQT1/glibc-2.9/nscd/nscd-client.h:320: undefined reference to `__sync_fetch_and_add_4' /home/frankc/DQTTest5/libc_pic.os: In function `nscd_getpw_r': /home/frankc/DQT1/glibc-2.9/nscd/nscd_getpw_r.c:232: undefined reference to `__sync_fetch_and_add_4' /home/frankc/DQTTest5/libc_pic.os: In function `__nscd_drop_map_ref': /home/frankc/DQT1/glibc-2.9/nscd/nscd-client.h:320: undefined reference to `__sync_fetch_and_add_4' /home/frankc/DQTTest5/libc_pic.os: In function `nscd_getgr_r': /home/frankc/DQT1/glibc-2.9/nscd/nscd_getgr_r.c:321: undefined reference to `__sync_fetch_and_add_4' /home/frankc/DQTTest5/libc_pic.os: In function `__nscd_drop_map_ref': /home/frankc/DQT1/glibc-2.9/nscd/nscd-client.h:320: undefined reference to `__sync_fetch_and_add_4' /home/frankc/DQTTest5/libc_pic.os:/home/frankc/DQT1/glibc-2.9/nscd/nscd_gethst_r.c:400: more undefined references to `__sync_fetch_and_add_4' follow /home/frankc/DQTTest5/libc_pic.os: In function `__nscd_get_map_ref': /home/frankc/DQT1/glibc-2.9/nscd/nscd_helper.c:431: undefined reference to `__sync_val_compare_and_swap_4' /home/frankc/DQTTest5/libc_pic.os: In function `*__GI___libc_freeres': /home/frankc/DQT1/glibc-2.9/malloc/set-freeres.c:39: undefined reference to `__sync_bool_compare_and_swap_4' collect2: ld returned 1 exit status

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AUTO: Ott, Jerry is out of the office. (returning 06/11/2011)
by JOtt＠semtech.com 28 May '11

28 May '11

I am out of the office until 06/11/2011. I will be out of the office starting 5/27/2011 and will not return until 6/12/2011. I will respond to your message when I return. Note: This is an automated response to your message "CentOS Digest, Vol 76, Issue 28" sent on 5/28/2011 9:00:02 AM. This is the only notification you will receive while this person is away.

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Where is the Centos Linux 5.5 kernel syscall handler for mmap?
by Frank Chang 28 May '11

28 May '11

Good evening, We are using Centos Linux Release 5.5 x86_32. We wondering where the kernel syscall handler for mmap in Centos Linux 5.5 distribution is located(for example /usr/xxx/....)? Would any programmers or operating system administrators have this information? Thank you.

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CentOS 5.5 x64, HP ProLiant Microserver and eSATA
by Andy Holt 27 May '11

27 May '11

Hello all. Not sure how many people here also frequent the CentOS forums, so apologies for the 'cross post'. I know some here are using CentOS on HP's ProLiant Microserver, so if anyone's tried eSATA on their box, please let me know. Perhaps best to reply over at the forum - https://www.centos.org/modules/newbb/viewtopic.php?viewmode=flat&topic_id=3… Thanks Andy

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calendar
by m.roth＠5-cent.us 27 May '11

27 May '11

Folks, My manager's asked me about something that can run on our CentOS boxes that can connect to an (bleah!) Exchange server's calendar. It doesn't look like Lightening can, and from some googling, it appears that Evolution claims to, but.... It's got to be able to set dates, etc. Can Evolution? Any other suggestions? mark

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Initial 6.0 trees in QA
by Paul Heinlein 27 May '11

27 May '11

In case you didn't see it, the initial CentOS 6 trees have been released to QA: http://qaweb.dev.centos.org/node/81 -- Paul Heinlein <> heinlein(a)madboa.com <> http://www.madboa.com/

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securing ldap with tls and security
by David Mehler 27 May '11

27 May '11

Hello, I'm trying to set up a centos 5.3 machine to do authentication via openldap. I've got it working, I'm not sure if I have it 100% right, but I can use ldapsearch to query the directory, use finger, id, chown, and other utilities with ldap usernames and groups, log in via ssh as an ldap user and if it's a new user automatically have the home directory created. Having got this far if anyone with a working ldap authentication system could give my config a sanity check let me know. My goal now is to get tls encryption going so that usernames and passwords aren't sent in the clear. I'm using self-signed certificates for now. Any help appreciated. Thanks. Dave.

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hi CentOS
by tronnw＠gmail.com 27 May '11

27 May '11

Hello CentOS it took a few days before i got the hang of it http://email.about.com/gi/dynamic/offsite.htm?zi=1/XJ&sdn=email&zu=http://c…

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Good network printer/scanner for Centos/Linux
by Eero Volotinen 27 May '11

27 May '11

Hi List, I am looking for good multifunction (fax, scanner, ..) color network laser printer for Linux, any ideas? specs: - Linux, Windows and OSX support on printer and also on scanner. - A4 papersize http://multi.gnt.lt/Pages/brochures/HP/CM2320MFP-ENG.pdf ? thanks, -- Eero

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Discuss May 2011