Discuss July 2012

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166 participants
155 discussions

Re: [CentOS] New /boot/message file?
by Keith Roberts 15 Jul '12

15 Jul '12

On Sun, 15 Jul 2012, Reindl Harald wrote: *snip* > you really think you are better writing grub.conf manually > than grubby will do? if there are issues with a newer > kernel then boot with the old one, that is why the previous > does not get removed on updates > > how will you ever notice problems with a new kernel before > it was loaded and how should it be loaded before a grub-entry > is made? Some good points there Reindl. I update my box once a week now. Usually if there are any kernel issues they are made know in a reasonable time. If I don't hear of any then I know it's safe for me to move to the latest kernel release. So basically I'm playing safe by letting others find any issues, and waiting until that's been addressed with another kernel release before I move onto the latest kernel. Kind Regards, Keith ----------------------------------------------------------- Websites: http://www.karsites.net http://www.php-debuggers.net http://www.raised-from-the-dead.org.uk All email addresses are challenge-response protected with TMDA [http://tmda.net] -----------------------------------------------------------

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New /boot/message file?
by Keith Roberts 15 Jul '12

15 Jul '12

I've just updated my 5.8 box and there's a new kernel to be installed. Looking at /boot/ directory I see this file called message: -rw-r--r-- root root 80032 Mar 12 2009 message Can anyone twll me what this message file is for please? Is this a new grub or kernel file? Kind Regards, Keith ----------------------------------------------------------- Websites: http://www.karsites.net http://www.php-debuggers.net http://www.raised-from-the-dead.org.uk All email addresses are challenge-response protected with TMDA [http://tmda.net] -----------------------------------------------------------

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Trying to find all the kernel modules needed for my machine using shell script
by Aft nix 14 Jul '12

14 Jul '12

Hi, I'm developing kernel modules right now, and the build times are starting to get under my skin. As a side effect i'm taking way too many "coffee" breaks during builds. So i was looking for a way to build only the stuffs i need for my platform. Chapter 7 and 8 of "linux kernel in a nutshell" gave a good detail of how to do that by hand. Its a good read : http://www.kroah.com/lkn/ But Although i understand the stuffs, this is still a lot of tweaks to make that work. 2.6.32 and later kernels added a new target "make localmodconfig". which scans through "lsmod" and change the .config appropriately. So i thought i found my "automation". But this perl script has some problem too. This thread describes the problems : https://bbs.archlinux.org/viewtopic.php?pid=845113 There was also a proposed solution which apparently worked for others , is to run the script directly instead of using make's target. Although for me, make localmodconfig does not work at all. its because of the following : $make clean $make mrproper $cp /boo/config-'uname -r' .config $make localmodconfig and it haults with vboxguest config not found!! nf_defrag_ipv6 config not found!! vboxsf config not found!! vboxvideo config not found!! The thing is my kernel development environment is inside virtualbox. These vbox modules were installed when i chose to install "virtualbox guest addtion". And the netfilter module might be a Distribution specific module(Lot of netfilter modules are not part of the mainline kernel, so its not a shock to me), which is not included in mainline kernel. Now the workaround this obviously unloading these module and trying again. But I'm thinking if there is patch for the "streamline_config.pl" which will enable the user to exclude certain modules if s/he wants. Problem is i have "zero" knowledge about perl and i like it that way. So my problems in "nutshell" 1) Patching streamline_config.pl so i can give a list of module name as argument which it will exclude from processing the config file. 2) I've tried to run the script by myself. But running it directly fails with a error. [root@kernel-host-rh6 linux-2.6]# sh scripts/kconfig/streamline_config.pl scripts/kconfig/streamline_config.pl: line 45: my: command not found scripts/kconfig/streamline_config.pl: line 47: my: command not found scripts/kconfig/streamline_config.pl: line 48: chomp: command not found scripts/kconfig/streamline_config.pl: line 50: syntax error near unexpected token `(' scripts/kconfig/streamline_config.pl: line 50: `my @searchconfigs = (' Again my "zero" knowledge about perl does not helping my case. Additional info: I have faced the same thing in 2.6.32, 2.6.33, 2.6.35, 3.4, 3.4.rc1 .....(I constantly switch version for various reasons, everywhere the problem is same) You can access the script from kernel.org gitweb: http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=blob;f=… Its from 3.4.0. `git log --stat scripts/kconfig/streamline_config.pl` shows some activity recently on this file. But my problem persists. 3) Is there any way i can get the "Centos specific" patches in "plain patch" format? That means i dont wanna do things in src-rpm way. If the patches are available in normal patch format i can keep everything tidy in my kernel git tree. -- -aft

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python 2.7 on CentOS
by Kaushal Shriyan 14 Jul '12

14 Jul '12

Hi Is python 2.7 available in CentOS 5.8 repos? Regards Kaushal

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BCM4313 on CentOS 6.3
by ottop＠lavabit.com 14 Jul '12

14 Jul '12

Hi all, I'm a complete newbie in Linux and am trying to get my Broadcom BCM4313 working in my Lenovo S10-3t netbook (CentOS 6.3 installed from LiveCD). I followed the steps in the wiki, which lead me to ELRepo: wl-kmod. I followed the instructions there until Step 2: $ mkdir -p ~/rpmbuild/{BUILD,RPMS,SPECS,SOURCES,SRPMS} $ echo -e "%_topdir $(echo $HOME)/rpmbuild\n%dist .el$(lsb_release -s -r|cut -d"." -f1).local" >> ~/.rpmmacros Then I got stuck with this message: bash: lsb_release: command not found Next, I tried using the driver from Broadcom site, and ended up with this message: KBUILD_NOPEDANTIC=1 make -C /lib/modules/`uname -r`/build M=`pwd` make[1]: Entering directory `/usr/src/kernels/2.6.32-279.el6.i686' CFG80211 API is prefered for this kernel version Using CFG80211 API LD /root/Downloads/hybrid_wl/built-in.o CC [M] /root/Downloads/hybrid_wl/src/shared/linux_osl.o CC [M] /root/Downloads/hybrid_wl/src/wl/sys/wl_linux.o CC [M] /root/Downloads/hybrid_wl/src/wl/sys/wl_iw.o CC [M] /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.o /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:64: warning: enum tx_power_setting declared inside parameter list /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:64: warning: its scope is only this definition or declaration, which is probably not what you want /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:1110: warning: enum tx_power_setting declared inside parameter list /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:1110: error: parameter 2 (type) has incomplete type /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c: In function wl_cfg80211_set_tx_power: /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:1123: error: TX_POWER_AUTOMATIC undeclared (first use in this function) /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:1123: error: (Each undeclared identifier is reported only once /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:1123: error: for each function it appears in.) /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:1125: error: TX_POWER_LIMITED undeclared (first use in this function) /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:1131: error: TX_POWER_FIXED undeclared (first use in this function) /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c: At top level: /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:1649: warning: initialization from incompatible pointer type /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:1651: warning: initialization from incompatible pointer type /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:1652: warning: initialization from incompatible pointer type /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:1653: warning: initialization from incompatible pointer type /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:1654: warning: initialization from incompatible pointer type /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:1658: warning: initialization from incompatible pointer type /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c: In function wl_inform_single_bss: /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:1817: error: too few arguments to function ieee80211_channel_to_frequency /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c: In function wl_bss_roaming_done: /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:2117: warning: passing argument 2 of cfg80211_roamed from incompatible pointer type include/net/cfg80211.h:3035: note: expected struct ieee80211_channel * but argument is of type u8 * /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:2117: warning: passing argument 4 of cfg80211_roamed makes pointer from integer without a cast include/net/cfg80211.h:3035: note: expected const u8 * but argument is of type s32 /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:2117: warning: passing argument 5 of cfg80211_roamed makes integer from pointer without a cast include/net/cfg80211.h:3035: note: expected size_t but argument is of type u8 * /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:2117: warning: passing argument 6 of cfg80211_roamed makes pointer from integer without a cast include/net/cfg80211.h:3035: note: expected const u8 * but argument is of type s32 /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:2117: error: too few arguments to function cfg80211_roamed /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c: In function wl_bss_connect_done: /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:2149: warning: passing argument 2 of cfg80211_roamed from incompatible pointer type include/net/cfg80211.h:3035: note: expected struct ieee80211_channel * but argument is of type u8 * /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:2149: warning: passing argument 4 of cfg80211_roamed makes pointer from integer without a cast include/net/cfg80211.h:3035: note: expected const u8 * but argument is of type s32 /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:2149: warning: passing argument 5 of cfg80211_roamed makes integer from pointer without a cast include/net/cfg80211.h:3035: note: expected size_t but argument is of type u8 * /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:2149: warning: passing argument 6 of cfg80211_roamed makes pointer from integer without a cast include/net/cfg80211.h:3035: note: expected const u8 * but argument is of type s32 /root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.c:2149: error: too few arguments to function cfg80211_roamed make[2]: *** [/root/Downloads/hybrid_wl/src/wl/sys/wl_cfg80211.o] Error 1 make[1]: *** [_module_/root/Downloads/hybrid_wl] Error 2 make[1]: Leaving directory `/usr/src/kernels/2.6.32-279.el6.i686' make: *** [all] Error 2 Then, I tried the older driver version from Ubuntu's site as suggested in CentOS wiki, and got this message: KBUILD_NOPEDANTIC=1 make -C /lib/modules/`uname -r`/build M=`pwd` make[1]: Entering directory `/usr/src/kernels/2.6.32-279.el6.i686' LD /root/Downloads/broadcom-sta/i386/built-in.o CC [M] /root/Downloads/broadcom-sta/i386/src/shared/linux_osl.o CC [M] /root/Downloads/broadcom-sta/i386/src/wl/sys/wl_linux.o CC [M] /root/Downloads/broadcom-sta/i386/src/wl/sys/wl_iw.o LD [M] /root/Downloads/broadcom-sta/i386/wl.o WARNING: modpost: missing MODULE_LICENSE() in /root/Downloads/broadcom-sta/i386/wl.o see include/linux/module.h for more information Building modules, stage 2. MODPOST 1 modules WARNING: modpost: missing MODULE_LICENSE() in /root/Downloads/broadcom-sta/i386/wl.o see include/linux/module.h for more information CC /root/Downloads/broadcom-sta/i386/wl.mod.o LD [M] /root/Downloads/broadcom-sta/i386/wl.ko.unsigned NO SIGN [M] /root/Downloads/broadcom-sta/i386/wl.ko make[1]: Leaving directory `/usr/src/kernels/2.6.32-279.el6.i686' I'm pretty much totally stuck now, as I have no idea what I'm doing at all . Would really appreciate any help. Thanks in advance!

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70-persistent-net-rules
by Jerry Geis 14 Jul '12

14 Jul '12

When my machine installs (CentOS 6.3) the two network cards are getting reversed. The PCI card is getting eth0 and the motherboard is getting eth1. I would like them in reverse order to keep things the same as they used to be. How can I easily tell these two to reverse? Generate the 70-persistent-net-rules with motherboard eth0 first then the PCI slot? Thanks, Jerry

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can NOT delete LV (in use) problem...
by mcclnx mcc 14 Jul '12

14 Jul '12

We have CENTOS 5.6 on DELL server. I create VG and LV on one SSD disk. after couple weeks I decide to delete it. I unmount file system but can not delete LV. It say "in use". I try following but still NOT work: # lvchange -an /dev/VG0-SSD910/LV01-SSD910 LV VG0-SSD910/LV01-SSD910 in use: not deactivating # kpartx -d /dev/VG0-SSD910/LV01-SSD910 # lvchange -an /dev/VG0-SSD910/LV01-SSD910 LV VG0-SSD910/LV01-SSD910 in use: not deactivating Anyone have ideal how to delete it? Thanks.

3 2

Strange httpd problem
by Eric Viseur 14 Jul '12

14 Jul '12

Hi, I'm currently setting up an IP accouting machine using CentOS 6 and pmacct, compiled from source. The machine has two network interfaces : - a "normal" one, used for SSH remote administration and viewing the accouting data through a webserver (eth0) - a "monitor" one, plugged into a mirroring port of our switch and with no IP address defined (eth1) The accouting part works fine, but I'm getting problems with the webserver. To ensure there are no interference with the monitor interface, I set iptables to drop all the outbound traffic on eth1 and httpd in bound to the IP address of eth0, but I randomly become unable to contact the webserver; my browser tells me it couldn't contact it. The SSH access works fine and the CPU and memory usage are OK (5% CPU and 10% memory, our network is currently on low traffic). Any clues why this is happening ? Regards, Eric Viseur

2 1

XEN or KVM - performance/stability/security?
by Rafał Radecki 14 Jul '12

14 Jul '12

Hi all. I am currently building a small test cloud based on Eucalyptus 2.0.3 and CentOS 5.8 x64. I have a choice which hypervisor to use: KVM or XEN. KVM is the default in CentOS 6 but I have read also many good things (for example PV guest machines, isolation between Dom0 and DomU) about XEN. Key factors from my opint of view are: - stability (which one runs more smoothly on CentOS?) - performance (XEN PV/HVM(with or without pv drivers) vs KVM HVM(with or without pv drivers)) - security Could you share your experience in these areas? Best regards, Rafal Radecki.

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Re: [CentOS] ssh port forwarding
by We Are Here 13 Jul '12

13 Jul '12

At 19:15 12/07/2012, you wrote: Hi Doug, >Thanks for the feedback Tim. Glad I could help. >Using your string, I can now telnet to port 22222 on localhost (hostA) and >I get the mysql connection string (from hostB), but it is not able to make >a mysql connection (using mysql -u user -p -h localhost --port=22222 from >hostA), with a test user that I set up to allow connections from anywhere. >The error that I am getting is: >ERROR 2002 (HY000): Can't connect to local MySQL server through socket >'/var/lib/mysql/mysql.sock' (2) > >I did test and the mysql test user that I created is able to connect from >hostB. Because the mysql connection is via an ssh tunnel, you need to ensure on the MySQL server hostB that is allows the mysql user access from 127.0.0.1 on hostB as that is effectively where the MySQL server on hostB sees the connection coming from. >Also, when I do this, it still opens up an ssh session, logging me into the >remote machine, thus making it so I can't use this terminal. Yes you need to run it is a screen session if you want it permanently connected. >The eventual goal is to do this in a script, that will open the connection, >use it for the duration of the script, and then close it when the script >finishes, but it looks like that won't work, since it is logging me into >the remote machine. I guess I could get around that by always leaving the >screen session going with the connection, but I would prefer only creating >the connection when I need it. > >Any ideas how to do this without leaving the connection open all the time? I have used an expect script to do this in the past. Which allows you to remotely log in to a server. Downside is you need to store the password in plain text in the expect script. So make sure only root can read the script. Or setup a lower privilege user to use sudo and do it that way. regards Tim Tim D'Cruz

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Discuss July 2012