Discuss August 2015

discuss@lists.centos.org

133 participants
127 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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abrt-watch-log -F BUG: WARNING: at WARNING: CPU: INFO: possible recursive locking detected
by Michael H 15 Feb '16

15 Feb '16

Hi All, I've been tuning a server recently and just today this has started to appear in my top/htop output. [root@db1 ~]# ps -aux | grep kernel root 1011 0.0 0.0 212048 4532 ? Ss 13:34 0:00 /usr/bin/abrt-watch-log -F BUG: WARNING: at WARNING: CPU: INFO: possible recursive locking detected ernel BUG at list_del corruption list_add corruption do_IRQ: stack overflow: ear stack overflow (cur: eneral protection fault nable to handle kernel ouble fault: RTNL: assertion failed eek! page_mapcount(page) went negative! adness at NETDEV WATCHDOG ysctl table check failed : nobody cared IRQ handler type mismatch Machine Check Exception: Machine check events logged divide error: bounds: coprocessor segment overrun: invalid TSS: segment not present: invalid opcode: alignment check: stack segment: fpu exception: simd exception: iret exception: /var/log/messages -- /usr/bin/abrt-dump-oops -xtD I had made a few changes to sysctl.conf which I have now reverted and the error still exists. my sysctl.conf contained; vm.swappiness=0 vm.overcommit_memory=2 vm.overcommit_ratio=90 - this was only added this morning because of an 'out of memory' error in postgresql. kernel.shmmax=35433480192 kernel.shmall=2214592512 which I have now removed. Can anyone shine any light on this? A little search on Google mentions faulty memory, I will install memtest today and see what the output is like. Thanks Michael

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Update from 6.6 to 6.7 > automount logs error message
by Ralf Aumüller 23 Sep '15

23 Sep '15

Hello, after an update from 6.6 to 6.7 the following error message is logged to /var/log/messages when I login (per ssh): Aug 11 16:31:21 a1234 automount[1598]: set_tsd_user_vars: failed to get passwd info from getpwuid_r Checked all log-files of my systems running 6.6 with same configuration -- never got such a message (We use NFS/autofs for home-directories, NIS and tcsh (login shell)). Everything seems to work -- but before I update all machines to 6.7 I want to know whats going on. Any comments? Best regards, Ralf

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LUKS encypted partition using --key-file can only be decrypted with --key-file
by Digimer 15 Sep '15

15 Sep '15

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi all, I created a LUKS encrypted partition via a udev-triggered script on 6.6 using --key-file /tmp/foo. This worked fine, and I can decrypt the LUKS partition via script and manually using --key-file with luksOpen. The odd problem is that I can't decrypt the partition using the prompt. If I manually create a file with the passphrase in it and then point to it with --key-file, it decrypts fine. I used 'cat -A /tmp/foo' to verify that there was no '\n' at the end of the phrase. Is this expected behaviour? That is; If you create an encrypted partition using --key-file, you always decrypt with the same? If so, I can't understand the logic... If not, then I am not sure what I am doing wrong. Thanks for any insight! digimer - -- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education? -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBAgAGBQJU93ZLAAoJECChztQA3mh0swwP/2PX3Y3TmEEIeN7WxWQjnbX0 B+hdp3Yk1PBqaQ/FsOzGsnKnxOUu73fB25gDksEWnNedBru4ayJuYPW644rH8Ivr fS8Pz3y6buGqUaggzsGNaGfDOKtiLOp722OeuPUmaNHnGCE3qJbhE3RKBRrMl4SP Yi/otL8+85cp4isMESOYs3F5qw/osDmmKxktPbULbTrne94EWHHl+9RoSFDZFNCj JBsNE122WUtn+2JPV8it8nlIS/Kzqzv3qGR88lYiBj3y3F+zIbpix/8wyCgRVSw6 /LQwLSTmGKYdvLw2Td7oIqMrW69ZsgujAonnbyx2nl9WN3KSqr799SxL4n2M7ZOj a1MjcLdLr0kM28eu+/A3LyHQRkBVsz7f27e7M+drEVa4OHFS3KuL4EM47xkTGyps veljkNmZ8elL7PX+dmWsVGYyo4XH/bTFDcW8ZLhr+bc55xLplMRrhPNNFGQ+5k3R ev7HRhSqHD9Ub39KTea4WCJOsm0hJJgKYneWYmQJ1aVYmrFMHLJaJBzCqU+W751O GkXvU24eoajNKnIAcY9wrC/WzVru8dM2JwBefcatxCsWFhpcpSyrh0zhCAiZKOga hjskIq/54Il8YyzSVy5Xvwv8WACBUwoiPv6ZqVm3oKRkoZI3E14vVYTcG+b0cPqn S30qAHntsjFA70Hpedt5 =YYFB -----END PGP SIGNATURE-----

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new laptop: DVD or Blu-ray
by ken 13 Sep '15

13 Sep '15

One of the build options for a laptop I'm looking at buying is DVD vs Blu-Ray. I've never used Blue-ray before, so is there some compelling reason, as a Linux guy, to want to get Blu-ray?

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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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How to setup own i686 buildenv for CentOS7
by Robin Lee 07 Sep '15

07 Sep '15

Hi, all! How to setup own i686 mock for CentOS7? Or, is there any public i686 repo for CentOS7? I found i686 repo available in internal CentOS building environment, from a root.log from a mock build result[1]. [1] http://buildlogs.centos.org/c7-updates/glibc/20141218212615/2.17-55.el7_0.3… Cheers, -robin

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Libvirt resume guest startup issues centos 7
by Jason Pyeron 01 Sep '15

01 Sep '15

Here is the relevant log snippet: journal: libvirt version: 1.2.8, package: 16.el7_1.3 (CentOS BuildSystem <http://bugs.centos.org>, 2015-05-12-20:12:58, worker1.bsys.centos.org) journal: failed to connect to monitor socket: No such process journal: internal error: process exited while connecting to monitor: ((null):1937): Spice-Warning **: reds.c:3036:reds_init_socket: getaddrinfo(127.0.0.1,5900): Address family for hostname not supported qemu-kvm: failed to initialize spice server If I remove graphics devices from the VM it saves/resumes properly on host restart. https://bugzilla.redhat.com/show_bug.cgi?id=721350 I feel like this is an issue of libvirt starting before networking, but I am a fish out of water with systemd. Any thoughts? -Jason -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- - - - Jason Pyeron PD Inc. http://www.pdinc.us - - Principal Consultant 10 West 24th Street #100 - - +1 (443) 269-1555 x333 Baltimore, Maryland 21218 - - - -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

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Shutdown hangs on "Unmounting NFS filesystems"
by Robert Nichols 31 Aug '15

31 Aug '15

Once the system gets into this state, the only remedy is a forced power-off. What seems to be happening is that an NFS filesystem that auto-mounted over a WiFi connection cannot be unmounted because the WiFi connection is enabled only for my login and gets torn down when my UID is logged off. Any suggestions on how I can configure things to avoid this? I really don't want to expose my WPA2 key by making the connection available to all users. -- Bob Nichols "NOSPAM" is really part of my email address. Do NOT delete it.

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[OT] GNU bc base conversion
by Mike - st257 31 Aug '15

31 Aug '15

Hello CentOS List Members, Thoughts as to why my BC functions aren't properly converting between bases? Decimal to binary or hex works fine, but not binary or hex to decimal and so forth. No doubt the syntax is in some way wrong, but when I test from the CLI and the right values are returned, I have to wonder. Other than a few other define statements, the only other option I have set is scale=5 in my bcrc. In reference to the order of (o|i)base parameters, I have specified obase before ibase [0]. [0] http://docstore.mik.ua/orelly/unix/upt/ch49_03.htm See below for my examples. Thanks! ]$ echo "bin_to_dec(1001)" | bc 1001 # should be decimal 9 ]$ echo "obase=10; ibase=2; 1001" | bc 9 ]$ grep bin_to_dec ~/.bcrc define bin_to_dec(b) { obase=10; ibase=2; return b; } ---- ]$ echo "hex_to_dec(AB)" | bc 99 # should be decimal 171 ]$ echo "obase=10; ibase=16; AB" | bc 171 ]$ echo "obase=A; ibase=16; AB" | bc 171 ]$ grep hex_to_dec ~/.bcrc define hex_to_dec(h) { obase=A; ibase=16; return h; } -- ---~~.~~--- Mike // SilverTip257 //

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Discuss August 2015