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can i config/build/boot a new kernel on centos 5.5 with LVM?
by Robert P. J. Day 20 Aug '10

20 Aug '10

(disclaimer: i'll be a bit vague about some of this since i don't have a test system to try to reproduce it until later today or this weekend.) during a RHEL SA course i was teaching this week, i was using both centos 5.5 and RHEL 6.0 beta 2 and, as a fun exercise, i was showing how to "git" checkout the kernel source tree, configure it, build, install and boot to a new kernel. sadly, at no time did that exercise actually work, so i just want to ask a general question -- should i, with a standard install of centos 5.5 with all of the required development packages, be able to checkout the kernel source, and build and boot a new kernel? upon reflection, the issues might have to do with the fact that LVM was in use and perhaps the initrd didn't have LVM support built in but, again, i can't check that until later today at the earliest. so, here's the hypothetical scenario i'm going to test later: * gateway, 64-bit laptop, with 64-bit centos 5.5, fully updated * /boot is primary ext4 partition * / and /home are logical volumes in a single volume group * "git clone" latest kernel source * "make defconfig" * "make" * "make modules_install" * "make install" is there any reason why the above shouldn't work? (and instead of "make defconfig", i can copy the /boot/config file for the stock kernel and "make oldconfig". i'll almost certainly try both just to cover all the possibilities.) so ... should this theoretically work? is there a web page that actually walks through the process? because we were having all kinds of grief just installing the kernel or booting and failing to find the root device (which is why i suspect something LVM-related.) i'm open to suggestions. thanks. rday p.s. obviuosly, i'd love to hear that someone else has already done this and it worked just fine. -- ======================================================================== Robert P. J. Day Waterloo, Ontario, CANADA Top-notch, inexpensive online Linux/OSS/kernel courses http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ========================================================================

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system shutdown - turning off quotas takes a long time
by Götz Reinicke - IT Koordinator 20 Aug '10

20 Aug '10

Hi, recently I had to instal a new raid storage system for our central fileserver. It is connected by iscsi (1Gbit) and the fielsystems mounted are 400GB and 1TB and ext3. curretly about 400 GB are used by 1.5 Mio files. I turned quota on and did a quota check. BUT on reboot the system crashes/hangs during 'turning off quotas' This message shows up about 30++ sec after the shutdown ... Any idea? Hint? Suggestion? The storage is an SUN 7110 with SAS drives. The Server Centos 5.5. fresh install, recent updates. Thanks and best regards. Götz -- Götz Reinicke IT-Koordinator Tel. +49 7141 969 420 Fax +49 7141 969 55 420 E-Mail goetz.reinicke(a)filmakademie.de Filmakademie Baden-Württemberg GmbH Akademiehof 10 71638 Ludwigsburg www.filmakademie.de Eintragung Amtsgericht Stuttgart HRB 205016 Vorsitzende des Aufsichtsrats: Prof. Dr. Claudia Hübner Geschäftsführer: Prof. Thomas Schadt

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Understanding FS ACLs
by Silviu Hutanu 20 Aug '10

20 Aug '10

I have problem understanding FS ACLs.Can someone explain me why the following behaviour occur? Let's suppose that we have a /shared directory we want to give rwx access to admins group. setfacl -m d:g:admins:rwx shared [root@rh1 /]# getfacl shared # file: shared # owner: root # group: root user::rwx group::r-x other::--- default:user::rwx default:group::r-x default:group:admins:rwx default:mask::rwx default:other::--- [root@rh1 /]# su - jack [jack@rh1 ~]$ id uid=500(jack) gid=507(admins) groups=507(admins) context=root:system_r:unconfined_t:SystemLow-SystemHigh [jack@rh1 ~]$ cd /shared/ -bash: cd: /shared/: Permission denied

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Which disk file format are you used in removable disk between xp and linux ?
by ganu MailList 20 Aug '10

20 Aug '10

The centos can not recognize the NTFS file format and my xp system can not format the removable disk to fat32. Which the disk format are you used if you want to share the data between xp and linux system?

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SCIM service does not start
by sync 20 Aug '10

20 Aug '10

Hi ,guys : I reboot my computer which is installed the CentOS 5.4 64 bits just now and find that SCIM service does not start And the error message is these: root@test <root@camlit> ~: tailf /var/log/message xxxx scim-bridge: Another agent is running .. xxx scim-bridge: Failed to allocate the agent . Exitting .... .... .... I also run this command "ps aux |grep scim " to pick up which process use the scim service and kill that , but that problem is as before . So what could I do ? thanks in advance .....

3 2

Installing on Intel EFI system
by Mayhall, Anthony J. (MSFC-ES53)[Dynamic Concepts Inc.] 20 Aug '10

20 Aug '10

Can I install CentOS 5.4 on an Intel based system that is not an Itanium system? The system BIOS has support for EFI and can boot to an EDI shell. Thanks, Anthony Mayhall

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Two display cards problem
by ganu MailList 20 Aug '10

20 Aug '10

My Thinkpad notebook has two the same display card. It is installed with Windows XP system and CentOS 5.3. When I reboot from CentOS to xp, the display card driver of windows xp is broken. I guess if the display card is switched in the CentOS? How to let these two system use the same display card?

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odd situation slightly off topic (sending file descriptors to another process)
by Jerry Geis 20 Aug '10

20 Aug '10

I have coded up the standard sendfd() and recvfd() for linux to send and recv file descriptors. seems to work (http://book.chinaunix.net/special/ebook/addisonWesley/APUE2/0201433079/ch17…) however when I recvfd() my number of open file descriptors bumps by 2 and not 1. (using lsof -p X | wc -l) I am not sure why the count jumps by 2 and not 1. The sendfd() is just sending a socket descriptor. If I close() the provided descriptor it only closes 1 handle (again using lsof above). So my recvfd() is giving me 2 but when I close() I only drop 1 and not 2. Something is not in alignment and just wondering if someone can shed some light on this. Thanks. Jerry

2 3

dmesg- bnx2i: iSCSI not supported, dev=eth0
by David 19 Aug '10

19 Aug '10

Getting "bnx2i: iSCSI not supported, dev=eth0" for all the NIC adapters on all of my R710's running CentOS 5.5. Here is an sample of the error messages: bonding: Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details. bonding: bond0: setting mode to active-backup (1). bonding: bond0: Setting MII monitoring interval to 500. ADDRCONF(NETDEV_UP): bond0: link is not ready bonding: bond0: Adding slave eth0. bnx2: eth0: using MSIX bnx2i: iSCSI not supported, dev=eth0 bonding: bond0: enslaving eth0 as a backup interface with a down link. bnx2i: iSCSI not supported, dev=eth0 bonding: bond0: Adding slave eth2. bnx2: eth2: using MSIX bnx2i: iSCSI not supported, dev=eth2 bnx2: eth0 NIC Copper Link is Up, 1000 Mbps full duplex bonding: bond0: enslaving eth2 as a backup interface with a down link. bnx2i: iSCSI not supported, dev=eth2 bonding: bond0: link status definitely up for interface eth0. bonding: bond0: making interface eth0 the new active one. bonding: bond0: first active interface up! bonding: bond0: link status definitely up for interface eth2. ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready bonding: bond0: link status definitely down for interface eth2, disabling it bnx2: eth2 NIC Copper Link is Up, 1000 Mbps full duplex bonding: bond0: link status definitely up for interface eth2. bond0: no IPv6 routers present Understanding that bnx2i is used for hardware iscsi, why is this error occurring? David

3 5

how to setup account which can 'su" to another account (NON-root)?
by mcclnx mcc 19 Aug '10

19 Aug '10

we have CENTOS 5.2 on DELL server. we need allow a user can "su" to another user without password. for example: account user1 can "su - user2" without password. (user2 is NOT root) I know this is big security risk but .... Anyone know how to do it? Thanks.

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