Discuss November 2014

discuss@lists.centos.org

182 participants
200 discussions

SSD for Centos SWAP /tmp & /var/ partition
by Keith Roberts 03 Sep '25

03 Sep '25

Has anyone actually used a SSD in a Centos setup? My little experiment with a s/h WD drive for /tmp and SWAP partitions kicked the bucket on Wednesday, when the poor WD drive caught the click-of-death. It was a s/h drive to start with and lasted about 4 months. But that was without the /var/log/ partition being written to it, as I mounted that back onto /var/log from the original drive. So I had to install another (WD) drive, and repartion it and rebuild my RPM package database, from the backed-up Packages file. That seems to be all OK now. I'm wondering if it would be a good idea to use a new SSD for moving all the disk i/o to, that Linux likes to do so often. Plus putting SWAP onto a decent SSD should speed things up somewhat. Here's a short video of a laptop fitted with a SSD drive booting macOS, compared to a similar laptop booting from the standard HDD. The laptop with the SSD boots and loads some apps in 28 seconds. The other one takes twice as long. http://eshop.macsales.com/shop/SSD/OWC/Mercury_Extreme_Pro_6G/?utm_source=t… Kind Regards, Keith Roberts ----------------------------------------------------------------- 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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SAMBA as AD DC
by Sergio Belkin 11 Sep '15

11 Sep '15

Hi folks, Is able SAMBA on CentOS 7 to work as Active Directory Domain Controller? If it's not, what is the recommended way of doing? Compiling from sources? Install packages from SerNet? Thanks in advance! -- -- Sergio Belkin http://www.sergiobelkin.com LPIC-2 Certified - http://www.lpi.org

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Mail Merge data to a pdf file by overlaying the data on the image
by Gregory P. Ennis 07 Jun '15

07 Jun '15

Everyone, I am looking for a utility that I can use to do a mail merge of data to a pdf image file. The image file does not have any active fields, but will be just an image file. I would like to overlay names addresses etc. We currently do this with a pcl file by just overlaying the data with pcl print positions. However, in order to get the pcl file from an original pdf file we have to use gimp to convert the pdf to pcl file, and we always lose a little resolution. I was wondering if anyone knows of a utility to perform this function without first converting the image to a pcl file. Thanks, -- Greg Ennis

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heavy IO load when working with sparse files (centos 6.4)
by Ron E 31 Mar '15

31 Mar '15

Dear List, We have noticed a variety of reproducible conditions working with sparse files on multiple servers under load with CentOS 6.4. The short story is that processes that read / write sparse files with large "holes" can generate an IO storm. Oddly, this only happens with holes and not with the sections of the files that contain data. We have seen extremely high IO load for example copying a 40 or 80gb sparse file that only has a few gigs of data in it. Attempts to lower the io priority and cpu priority of these processes do not make any measurable difference. (ionice, nice) This has been observed with processes such as: cp rsync sha1sum The server does have to be under some load to reproduce the necessary conditions. The cases we have seen involve servers running 10-30 guests under kvm. Load is in acceptable norms when the processes are run, such as load avg 5-15 on a 24 core (12 core with HT enabled) server. We also verify before starting such a process that the spindle with the file we're working on is not being unduly hammered by another process. These servers have one hardware raid controller each (Dell H700 controller with write cache enabled) and multiple raid arrays (separate sets of physical spindles). Interestingly, the IO storm is not limited to the array / spindles where the sparse file resides but affects all IO on that server. We have looked extensively and not found any account of a similar issue. We have seen this on configurations that are 'plain vanilla' enough to think that this is not something specific to our environment. Wondering if anyone else has seen this and if any suggestions on gathering more data / troubleshooting. We wonder if we've found either a raid controller driver issue, an OS issue or some other such thing. What seems to point in this direction is that even with ionice -c3 which should prevent the process from using IO unless the storage is idle, an io storm which appears to saturate the entire raid bus on a given server can occur. Thanks in advance.

3 3

Centos 6.4 on Xserve, IPMI error
by Arno B 31 Mar '15

31 Mar '15

Hello! I'm trying to install Centos 6.4 64 bit on this Xserve: http://www.everymac.com/systems/apple/xserve/specs/xserve-intel-xeon-2.8-ei… I got a bootloader from: http://blog.christophersmart.com/2009/07/23/linux-on-an-apple-xserve-efi-on… as none of the official Centos releases (full, minimal, network 64 bit) boot on this machine. They all crash when loading the bootx64.conf. I have built a USB stick with a working bootx64.efi, grub.cfg, together with an initrd and a vmlinuz from the isolinux folder. These seem to get me into booting a kernel until something called IPMI is starting to throw errors at me: Console: switching to colour frame buffer device 128x48 fb0: VESA VGA frame buffer device ipmi message handler version 39.2 IPMI System Interface driver. ipmi_si 0000:09:00.4: enable device (0002 -> 0003) ipmi_si 0000:09:00.4: PCI INT C -> GSI 16 (level, low) -> IRQ 16 ipmi_si: Adding PCI-specified kcs state machine ipmi_si 0000:09:00.7: enable device (0000 -> 0003) ipmi_si 0000:09:00.7: PCI INT D -> GSI 17 (level, low) -> IRQ 17 ipmi_si: Adding PCI-specified bt state machine ipmi_si: Trying PCI-specified kcs state machine at mem address 0x90841000, slave address 0x0 irq 16 IRQ 16/ipmi_si: IRQF_DISABLED is not guaranteed on shared IRQs Using irq 16 ipmi: Found new BMC (man_id: 0x00003f, prod_id: 0x0003, dev_id: 0x20) IPMI kcs interface initialized ipmi_si: Trying PCI-specified kcs state machine at mem address 0x90840000, slave address 0x0 irq 17 Refined TSC clocksource calibration: 2792.999 MHz. Switching to clocksource tsc IPMI BT: timeout in XACTION [ B_BUSY ] 1 retries left IPMI BT: timeout in XACTION [ B_BUSY ] failed 2 retries, sending error response IPMI: BT reset (takes 5 secs) IPMI BT: timeout in XACTION [ B_BUSY H2B ] failed 2 retries, sending error response IPMI: BT reset (takes 5 secs) IPMI BT: timeout in XACTION [ B_BUSY H2B ] failed 2 retries, sending error response IPMI: BT reset (takes 5 secs) IPMI BT: timeout in XACTION [ B_BUSY H2B ] failed 2 retries, sending error response IPMI: BT reset (takes 5 secs) IPMI BT: timeout in XACTION [ B_BUSY H2B ] failed 2 retries, sending error response IPMI: BT reset (takes 5 secs) then the screen goes to black and the machine doesn't respond to anything anymore... Can anyone please help me with this? Maybe just point me in a direction where to find a solution? I've been googling for a few days now without much results... thanks in advance Arno Beekman

2 1

Chromium browser for C6
by Robert Arkiletian 23 Jan '15

23 Jan '15

I found this bug fix report http://lwn.net/Articles/616130/ I thought we were not able to get Chromium for C6. Apparently it looks like the work has been already done. Is it possible we (hi Johnny) can get this package into C6? This would be a wonderful addition to CentOS 6. Please and thank you.

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What's up with Firefox/Thundrebird
by Mark LaPierre 16 Jan '15

16 Jan '15

Hey All, Has anyone had trouble with Firefox/Thunderbird? When I log on if I start Thunderbird first then I can't start Firefox. Clicking on a link in an email fails to start Firefox. If I start Firefox before Thunderbird then hyperlinks in emails open a page in the existing Firefox instance. Other users on this same machine are having the same problems. This has been happening for that last several days. CentOS release 6.6 (Final) Linux mushroom.patch 2.6.32-504.1.3.el6.i686 #1 SMP Tue Nov 11 16:30:09 UTC 2014 i686 i686 i386 GNU/Linux Thunderbird 31.2.0 Firefox 31.2.0 -- _ °v° /(_)\ ^ ^ Mark LaPierre Registered Linux user No #267004 https://linuxcounter.net/ ****

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openvpn client and KDE Network Manager - with CentOS7
by CS DBA 22 Dec '14

22 Dec '14

Hi All, I am switching from Fedora20 to CentOS7 since I now run all my Linux development in a VM and I get a more robust feature set (i.e. shared folders with the host that "just work", etc) The only issue I have thus far is VPN connections. Looking at what's installed on my old Fedora install I suspect I need these packages: kde-plasma-nm-vpnc kde-plasma-nm-openvpn NetworkManager-openvpn NetworkManager-vpnc However none of these are available in CentOS7, Note I have the centos extras and the EPEL repos enabled. I suspect that I need rpmfusion but I don't see that rpmfusion has a repo for CentOS7... Anyone have any thoughts? Can I simply install the centos6 rpmfusion repo? Thanks in advance

3 4

10 Gbps adapter recommendation
by Nux! 08 Dec '14

08 Dec '14

Hi guys, I'm yet to use 10 Gbps with CentOS, hence my question. I'm looking for a cheap (doh) adapter that won't cause me problems with CentOS. Any recommendations? Cheers Lucian -- Sent from the Delta quadrant using Borg technology! Nux! www.nux.ro

3 2

SEtroubleshootd Crashing
by Gary Smithson 04 Dec '14

04 Dec '14

When running Node.js through Phusion Passenger on Centos 6.5 ( Linux 2.6.32-431.23.3.el6.x86_64 #1 SMP Thu Jul 31 17:20:51 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux), with SELinux enabled in permissive mode we receive a large number of entries in the audit.log and setroubleshootd randomly crashes with the following error, We have resolved the selinux alerts by following the troubleshooting steps recommend by running sealert,However we are concerned by setroubleshootd crashing and are concered that we may have masked the issue by fixing the entries in the audit.log. abrt_version: 2.0.8 cmdline: /usr/bin/python -Es /usr/sbin/setroubleshootd -f '' executable: /usr/sbin/setroubleshootd kernel: 2.6.32-431.23.3.el6.x86_64 last_occurrence: 1417101625 time: Thu 27 Nov 2014 03:20:25 PM UTC uid: 0 username: root sosreport.tar.xz: Binary file, 3642240 bytes backtrace: :analyze.py:426:lookup_signature:ProgramError: [Errno 1001] signature not found : :Traceback (most recent call last): : File "/usr/lib64/python2.6/site-packages/setroubleshoot/analyze.py", line 401, in auto_save_callback : self.save() : File "/usr/lib64/python2.6/site-packages/setroubleshoot/analyze.py", line 377, in save : self.prune() : File "/usr/lib64/python2.6/site-packages/setroubleshoot/analyze.py", line 340, in prune : self.delete_signature(sig, prune=True) : File "/usr/lib64/python2.6/site-packages/setroubleshoot/analyze.py", line 471, in delete_signature : siginfo = self.lookup_signature(sig) : File "/usr/lib64/python2.6/site-packages/setroubleshoot/analyze.py", line 426, in lookup_signature : raise ProgramError(ERR_NO_SIGNATURE_MATCH) :ProgramError: [Errno 1001] signature not found : :Local variables in innermost frame: :matches: [] :siginfo: None :self: <setroubleshoot.analyze.SETroubleshootDatabase object at 0x151d590> :sig: <setroubleshoot.signature.SEFaultSignature object at 0x645a050> We are running the following versions Passenger/htttpd/node passenger --version Phusion Passenger version 4.0.53 httpd -v Server version: Apache/2.2.15 (Unix) Server built: Jul 23 2014 14:17:29 node -v v0.10.32 This email is from the Press Association. For more information, see www.pressassociation.com. This email may contain confidential information. Only the addressee is permitted to read, copy, distribute or otherwise use this email or any attachments. If you have received it in error, please contact the sender immediately. Any opinion expressed in this email is personal to the sender and may not reflect the opinion of the Press Association. Any email reply to this address may be subject to interception or monitoring for operational reasons or for lawful business practices.

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Discuss November 2014