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Kernel version in CentOS 7 pxeboot images
by Jeff White 09 May '16

09 May '16

I have a number of machines which PXE boot using the images provided by CentOS here: http://mirror.centos.org/centos/7/os/x86_64/images/pxeboot/ That gives the machines kernel 3.10.0-327.el7.x86_64. I would like to move to a newer kernel as I'm seeing a serious I/O problem which I suspect is a kernel bug. I thought that would be as easy as grabbing the files from here: http://mirror.centos.org/centos/7.2.1511/os/x86_64/images/pxeboot/ ... but that's not the case, those are the same exact files as the earlier ones. These machines always PXE boot, they have no OS installed to their local disk. Instead their root filesystem is on an NFS server. So this is not PXE+kickstart or other provisioning system, just PXE then mount an NFS export for its root filesystem. So, how would one go about creating a new vmlinuz and initrd.img the same way that the ones shown above were built, except with a newer kernel? Also, what is upgrade.img? -- Jeff White HPC Systems Engineer Information Technology Services - WSU

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Upgrade tool for 6 to 7 migration
by Jerry Geis 09 May '16

09 May '16

Is the https://wiki.centos.org/TipsAndTricks/CentOSUpgradeTool still not recommend? Is there a expected time when it will be working? Thanks, Jerry

3 3

Re: [CentOS] Internal RAID controllers question
by Gordon Messmer 09 May '16

09 May '16

On 05/09/2016 11:01 AM, Valeri Galtsev wrote: > Thanks Gordon! Yes, I know, ZFS, of course. I hear it as you definitely > will use zfs for "bricks" of distributed file system, right? You could, I suppose, but I don't think its use case is limited to that. There aren't many spaces where I think you *shouldn't* plan to use reliable filesystems (ZFS, btrfs, ReFS).

3 3

CentOS 7.2 Installation - Anaconda Installer Security Policy Configuration
by Michael Duvall 09 May '16

09 May '16

The Anaconda installer now provides a "Security Policy", although selecting any of the available profiles does not seem to have much effect on the overall installation. Has anyone here had any success with using the kickstart file that is installed when "Pre-release Draft STIG for CentOS Linux 7 Server" profile is selected? The upstream vendor's security guide doesn't seem to offer much guidance. All accounts of trials and tribulations are appreciated. My goal is to install/verify (or as close as I can get to it) a STIG compliant CentOS 7.2 distribution. Thanks! Michael Duvall

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C6 Firefox 45.1 segmentation faults
by Robert Arkiletian 09 May '16

09 May '16

on updated C6 x86_64 Firefox ESR 45.1.0 is seg faulting on various sites, mainly media sites. Tried uninstalling flash-plugin 11.2.202.616 but problem persists. Work around: installed Seamonkey from epel repo Anyone else experiencing unstable behaviour of FF 45.1 on C6?

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OT: hardware: MegaCli and initializing a RAID
by m.roth＠5-cent.us 09 May '16

09 May '16

Got a new box I'm trying to set up. I configured the RAID from the firmware, but "fast initialize" was sitting there at 0% (it's about 43 or 45TB). The first time I tried this, I said background, and rebooted the system. And the stupid annoying alarm started up as the system came up. This time, having *finally* figured out how to set up hot spares from the WebBIOS, I suspended the fast initialization, and brought the system up. Googling, I can't find a command to continue the initialization. Anyone know of one, or is what I want to do rebuild the RAID? mark

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CentOS-6.7 problem updating kernel
by James B. Byrne 09 May '16

09 May '16

We have four identical hardware system. On one of them the most recent kernel update yields this error: # yum history info 332 Loaded plugins: etckeeper, fastestmirror, priorities Transaction ID : 332 Begin time : Wed May 4 10:21:07 2016 Begin rpmdb : 831:9ef9185577e3d2adb2d1ff0045619e1e0d9ed23a User : root <root> Return-Code : ** Aborted ** Command Line : update -y Transaction performed with: Installed rpm-4.8.0-47.el6.x86_64 @base Installed yum-3.2.29-69.el6.centos.noarch @base Installed yum-metadata-parser-1.1.2-16.el6.x86_64 @base Installed yum-plugin-fastestmirror-1.1.30-30.el6.noarch @base Packages Altered: ** Updated initscripts-9.03.49-1.el6.centos.4.x86_64 @updates Update 9.03.49-1.el6.centos.5.x86_64 installed ** Erase kernel-2.6.32-573.7.1.el6.x86_64 @updates Install kernel-2.6.32-573.26.1.el6.x86_64 installed ** Updated kernel-firmware-2.6.32-573.22.1.el6.noarch @updates Update 2.6.32-573.26.1.el6.noarch installed ** Updated kernel-headers-2.6.32-573.22.1.el6.x86_64 @updates Update 2.6.32-573.26.1.el6.x86_64 installed ** Updated perf-2.6.32-573.22.1.el6.x86_64 @updates Update 2.6.32-573.26.1.el6.x86_64 installed Scriptlet output: 1 error: %posttrans(kernel-2.6.32-573.26.1.el6.x86_64) scriptlet failed, signal 1 2 /sbin/dracut: line 1: 7063 Hangup ! ( umask 077; cd "$initdir"; find . | cpio -R 0:0 -H newc -o --quiet | $gzip -9 > "$outfile" ) history info Any ideas as to what happened and how to fix it? -- *** e-Mail is NOT a SECURE channel *** Do NOT transmit sensitive data via e-Mail Do NOT open attachments nor follow links sent by e-Mail 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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CentOS-6.5 - CD/DVD does not sense media
by James B. Byrne 09 May '16

09 May '16

I dealing with problem 1 - see previous message - I set about creating a live DVD on my development system. Now I find that I cannot seem to mount a medium in that drive. wodim --devices reports it as present and so does cdrecode. I can use the eject utility to toggle the tray open and closed. But when I load a blank dvd or cd in that unit I get nothing on my desktop - in other words I am not getting an auto mount, and I cannot do anything with dd to that dev either. wodim --devices wodim: Overview of accessible drives (1 found) : -------------------------------------------------------------------- 0 dev='/dev/scd0' rwrw-- : 'HL-DT-ST' 'DVD-RAM GH22NS30' -------------------------------------------------------------------- cdrecord -inq Device was not specified. Trying to find an appropriate drive... Detected CD-R drive: /dev/cdrw Using /dev/cdrom of unknown capabilities Device type : Removable CD-ROM Version : 5 Response Format: 2 Capabilities : Vendor_info : 'HL-DT-ST' Identification : 'DVD-RAM GH22NS30' Revision : '1.01' Device seems to be: Generic mmc2 DVD-R/DVD-RW. But cdrecord says that their is no media present although I have empirically determined that a blank dvd is in fact loaded into the device: cdrecord -load wodim: Operation not permitted. Warning: Cannot raise RLIMIT_MEMLOCK limits.Device was not specified. Trying to find an appropriate drive... Detected CD-R drive: /dev/cdrw Using /dev/cdrom of unknown capabilities Device type : Removable CD-ROM Version : 5 Response Format: 2 Capabilities : Vendor_info : 'HL-DT-ST' Identification : 'DVD-RAM GH22NS30' Revision : '1.01' Device seems to be: Generic mmc2 DVD-R/DVD-RW. Using generic SCSI-3/mmc CD-R/CD-RW driver (mmc_cdr). Driver flags : MMC-3 SWABAUDIO BURNFREE Supported modes: TAO PACKET SAO SAO/R96P SAO/R96R RAW/R16 RAW/R96P RAW/R96R Errno: 5 (Input/output error), test unit ready scsi sendcmd: no error CDB: 00 00 00 00 00 00 status: 0x2 (CHECK CONDITION) Sense Bytes: 70 00 02 00 00 00 00 0A 00 00 00 00 3A 01 00 00 Sense Key: 0x2 Not Ready, Segment 0 Sense Code: 0x3A Qual 0x01 (medium not present - tray closed) Fru 0x0 Sense flags: Blk 0 (not valid) cmd finished after 0.000s timeout 40s wodim: No disk / Wrong disk! Any ideas as to what is happening here? -- *** e-Mail is NOT a SECURE channel *** Do NOT transmit sensitive data via e-Mail Do NOT open attachments nor follow links sent by e-Mail 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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access denied from windows changing security setting when i use a folder connected to a fake drive made with dd
by nikos sarantopoulos 09 May '16

09 May '16

i make a image file connected to /dev/loop0 formated as ext4 partition and connect it losetup /dev/loop0 /root/disk.img then make format the loop drive with mkfs.ext4 -o rw,usrquota,grpquota /dev/loop0 /disk connected it to /test the only way to write there other users except root is setting with chmod o+w /test from windows 7 using samba 4 i can write to folder but i cannot set security setting getting always access denied when i am setting security settings on the share what is wrong thank you sarantopoulos nikos

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Samba problem
by ploppy ploppy 09 May '16

09 May '16

Hi everybody, I have to mount a DNS backend on Samba 4. I made a lot of search but all send me to "samba-tool" which will allow me to create the dns backend. I wonder if "samba-tool" is absent in the samba package ? :s If anyone have a piece of answer, it will be very kind. Thank you

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