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CentOS 6 spontaneous reboots
by Bill Gee 30 May '16

30 May '16

Hello everyone - My CentOS 6.8 server has been rebooting itself every 2 to 4 hours for the last several days. I do not know where to look for logs that might give a clue what the problem is. There are no unusual entries in /var/log/messages. I looked over other log files in /var/log and found nothing suggestive. Where else can I look? By luck I saw the beginning of a reboot on the server console. Normally I have other systems up on the KVM switch. It appears to have dumped core. I don't know where to look for the core dump files. They are not in /root. The problem started while the server was still 6.7. It had almost 290 days of uptime when the problem started. I have tried the following, none of which made any difference. I ran the upgrade to 6.8. I tried stopping non-essential services two at a time. I ran MemTest 86+. No memory errors were found. I turned off swap. I unplugged the USB hard drive that I use to hold daily and weekly backups. It was being recognized as /dev/sda for some reason. Lm_sensors shows the processor running between 45 and 50C. Hddtemp shows the hard drives running between 35 and 40C. LM_Sensors does not produce valid data on fan speed, but a visual check shows all fans running normally and no build-up of dust. The system is behind a big UPS that runs several other systems. The UPS log file does not record any power failures and none of the other systems are rebooting at random. What else can I look at? Thanks - Bill Gee

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C6.8 YUM reference to Red Hat
by Always Learning 30 May '16

30 May '16

Doing a yum update on C6.8 ................. : yum update Loaded plugins: fastestmirror, priorities, protectbase Setting up Update Process Loading mirror speeds from cached hostfile * base: centos.datente.com * epel: mirrors.n-ix.net * extras: mirror.softaculous.com * updates: centos.datente.com base | 3.7 kB 00:00 base/primary_db | 4.7 MB 00:00 cr | 3.3 kB 00:00 cr/primary_db | 1.2 kB 00:00 epel | 4.3 kB 00:00 epel/primary_db | 5.8 MB 00:00 extras | 3.4 kB 00:00 extras/primary_db | 36 kB 00:00 mariadb | 2.9 kB 00:00 http://mirror.centos.org/centos/6/SCL/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found" Trying other mirror. To address this issue please refer to the below knowledge base article https://access.redhat.com/articles/1320623 If above article doesn't help to resolve this issue please open a ticket with Red Hat Support. ~~~~~~~~~~~~~ The Red Hat explanation is blocked. All one can read is " This issue generally occurs if client system is able to commun... Subscriber exclusive content" QUESTIONS (1) Should the Red Hat link be replaced by a Centos one ? (2) Why am I seeing a 'SCL' URL when I have not subscribed to Software Collections ? (3) I did not get the error when updating other C6 installations around Europe, probably because they used different sources, so is the error caused by a faulty mirror file ? Despite the error, I successfully installed acpid x86_64 1.0.10-3.el6 base 37 k centos-release x86_64 6-8.el6.centos.12.3 base 21 k findutils x86_64 1:4.4.2-9.el6 base 447 k logwatch noarch 7.3.6-54.el6 base 303 k pango x86_64 1.28.1-11.el6 base 351 k passwd x86_64 0.77-7.el6 base 89 k wget x86_64 1.12-8.el6 base 484 k Comments and advice welcome and appreciated, as always. -- Regards, Paul. England, EU. England's place is in the European Union.

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grub (?) issue on Optiplex 780 A15, 6.8 upgrade
by Zube 30 May '16

30 May '16

Most of the upgrades to CentOS 6.8 have gone smoothly. Thanks, as always, for all the work that goes into making it so easy to upgrade. On a few machines, however, all of them curiously: Dell Inc. OptiPlex 780 /0C27VV, BIOS A15 08/06/2013 There is something wrong with their interaction with grub (?). I noticed this after adding '3' to the module line to get it to runlevel 3, but the machine came up at runlevel 5 anyway. On machines that are working correctly, the dmesg output looks like this: Command line: /boot/vmlinuz-2.6.32-642.el6.x86_64 ro root=UUID=20a8bd64-5783-4007-a5e4-e41bfc07f3c8 intel_iommu=on rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb rdblacklist=nouveau quiet if the options are on the module line or like this: Command line: ro root=UUID=7d11ff13-106f-42df-9a41-9ebf2505f6d2 rd_NO_LUKS rd_NO_LVM rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us rhgb quiet crashkernel=auto rdblacklist=nouveau if the options are on the kernel line. But on the offending machines, it looks like this: Command line: /boot/vmlinuz-2.6.32-642.el6.x86_64 ro root=UUID=2a0a0120-8155-4ef4-8048-c82567746ca9 intel_iommu=on amd_iommu=on rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet rdblacklist=nouveaulevel: RAID 0: Stripes data (performance). RAID 1: Mirrors data (redundancy). Recovery: Copies data between a master and a recovery disk. So something seems to be scribbling somewhere where it shouldn't. These machines are not RAIDed in any way and I'm confident that I didn't see this problem when I upgraded to 6.7. If I reduce the length of the module line, it just scribbles a bit further back, i.e. "rdblacklist=nouveau1(Mirror)" Any advice appreciated. Cheers, Zube

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Successful update from CentOS 6.7 to CentOS 6.8, but ...
by Walter H. 30 May '16

30 May '16

Hello, I have several CentOS 6 VMs, I have updated the first one successfully, but there is one thing I miss or I don't like; How do I get the standard console with 80x25 back? this is /boot/grub/grub.conf default=0 timeout=5 splashimage=(hd0,0)/grub/splash.xpm.gz hiddenmenu title CentOS (2.6.32-642.el6.x86_64) root (hd0,0) kernel /vmlinuz-2.6.32-642.el6.x86_64 ro root=UUID=a27dc9a0-ea3a-497d-a9c3-80c7bbba31fa rd_NO_LUKS LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto rd_NO_DM rd_NO_LVM KEYBOARDTYPE=pc KEYTABLE=de config_NO_HZ vga=0x0300 initrd /initramfs-2.6.32-642.el6.x86_64.img I've added 'vga=0x0300' (the same would be 'vga=768'), but this results in 100x37? Thanks for Help, Walter

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Re: [CentOS] centos7 tmpfiles.d deleted outdate files
by Qiang Chen 30 May '16

30 May '16

Hi Jonathan Billings, the `age` can't apply to 'r', only would apply to 'd', 'D', 'x', 'X', etc "The age field only applies to lines starting with |d|, |D|, |v|, |q|, |Q|, |C|, |x| and |X|. If omitted or set to "|-|", no automatic clean-up is done." so, there have good idea if I only want to delete the specific files not all files in that dir? thx. On 2016年05月26日 20:54, Jonathan Billings wrote: > Boxbe <https://www.boxbe.com/overview> This message is eligible for > Automatic Cleanup! (billings(a)negate.org) Add cleanup rule > <https://www.boxbe.com/popup?url=https%3A%2F%2Fwww.boxbe.com%2Fcleanup%3Fkey…> > | More info > <http://blog.boxbe.com/general/boxbe-automatic-cleanup?tc_serial=25540750649…> > > > > On Thu, May 26, 2016 at 03:03:25PM +0800, Qiang Chen wrote: >> Would some one help me for this question? thanks very much. > I would suggest reading the tmpfiles.d man page. > > Use 'd' for the directory, and 'r' for the files you want to remove, > including the age. Something like 'r /path/* - - - 10s'. > -- Best Regards, Chen, Qiang

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Re: [CentOS] centos7 tmpfiles.d deleted outdate files
by Qiang Chen 30 May '16

30 May '16

so, there no method to delete special files that below a directory? such as in the directory [root@chenqiang]# tree . ├── test_10d └── test_20d 0 directories, 2 files [root@chenqiang]# ll total 8 -rw-r--r-- 1 root root 4 5月 20 19:14 test_10d -rw-r--r-- 1 root root 4 5月 10 19:15 test_20d So, I want to delete file test_20d, keep test_10d, how to do that? thx. On 2016年05月27日 02:12, Gordon Messmer wrote: > Boxbe <https://www.boxbe.com/overview> This message is eligible for > Automatic Cleanup! (gordon.messmer(a)gmail.com) Add cleanup rule > <https://www.boxbe.com/popup?url=https%3A%2F%2Fwww.boxbe.com%2Fcleanup%3Fkey…> > | More info > <http://blog.boxbe.com/general/boxbe-automatic-cleanup?tc_serial=25543758553…> > > On 05/24/2016 11:18 PM, Qiang Chen wrote: >> #Type Path Mode UID GID Age Arg >> d /chenqiang 0775 root root 10s >> f /chenqiang/test_10s 0660 root root 10s >> f /chenqiang/test_20s 0660 root root 20s >> ``` >> >> It can delete dir if the age > 10s, but can't delete the files in it. > > > The man page for tmpfiles.d says, of the age field: > "The age field only applies to lines starting with d, D, and x." > > So, the line: > > d /chenqiang/test_10s 0660 root root 10s > > indicates that systemd-tmpfiles should create the directory > /chenqiang/test_10s, owned by root/root with mode 0660, and > periodically clean it of files and empty directories more than 10s old. > > Note that the default configuration runs systemd-tmpfiles once per > day, so specifying time periods much smaller than that may not be useful. > > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org > https://lists.centos.org/mailman/listinfo/centos -- Best Regards, Chen, Qiang

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Unable to boot CentOS 6 - Segmentation Erorr
by John Cenile 29 May '16

29 May '16

Hi all, I had an issue this morning with one of my virtual machines. It wouldn't boot (into any runlevel), nor could I chroot into the root partition using a rescue disk. Unfortunately I didn't grab a screenshot, however the error(s) when booting were: /pre-pivot/50selinux-loadpolicy.sh: 14 <other messages> init: readahead main process (425) killed by SEGV signal init: readahead-col lector main process (421) killed by SEGV signal init: rcS pre-start process (425) killed by SEGV signal init: Error while reading from descriptor: Bad file descriptor init: readahead-col lector post-stop process (424) killed by SEGV signal init: rcS post-stop process (427) killed by SEGV signal init: readahead-disable-services main process (428) killed by SEGV signal When using a rescue CD and chrooting into the root partition, I would get : Segmentation Fault: Core Dumped In the end, the fix was to boot into a rescue CD with networking, and SCP the entire contents of /bin and /sbin from another (working) server to the broken installation. This finally allowed CentOS 6 to boot correctly. So I'm left to assume some of the files in /bin *or */sbin were corrupt. My question is, does anyone have any ideas on how this might have happened? I did do a quick memory test using the rescue CD (it didn't complete) and there weren't any errors. The virtual machine is running on VMWare with 3 other VMs, which all seem fine. There wasn't any unexpected power loss either. Thanks.

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CentOS 6.8 Apache-2.2.15-53 re-write question
by Paul R. Ganci 29 May '16

29 May '16

I was wondering if somebody could help me with an Apache re-write rule. Apparently CentOS 6.8 is running apache-2.2.15-53. I am trying to redirect all pages except for two pages. The apache rewrite directives in the httpd config are: RewriteEngine on RewriteCond %{REQUEST_URI}!^/test/ RewriteCond %{REQUEST_URI}!^/my-folder/ RewriteRule (.*) http://www.newdomain.com/$1 [R=301,L] These commands should cause all requests to get re-directed to www.newdomain.com except for those with a /test or /my-folder on the end of the URL. However when I place these commands into the the httpd config apache spits out this error message: Starting httpd: Syntax error on line 31 of /etc/httpd/conf.d/olddomain.conf: RewriteCond: bad argument line '%{REQUEST_URI}!^/test/ I have of course renamed the real config parameters. Can somebody tell me if these directives only work in apache-2.4 and if so how do I do the same thing in apache-2.2? If these directives should work in apache-2.2 is this an apache problem? Thanks for your help. -- Paul (ganci(a)nurdog.com) Cell: (303)257-5208

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what multimedia framework does Centos use
by qw 29 May '16

29 May '16

Hi, My question is : what multimedia framework does Centos use for server purpose? Thanks! B.R. Andrew

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Looking for location of some specific settings in CentOS 6.x
by Walter H. 28 May '16

28 May '16

Hello, I have several virtual machines, all with CentOS 6.x and one so called virtual server at a web hoster my virtual machines (VMware) were all installed manually using the .iso, some exist longer and therefore were originally a CentOS 6.3, some are newer and wer originally a CentOS 6.6; and this virtual server has been installed using a preconfigured image from the web hoster; on all this virtual machines and the virtual server several 'yum update' brought them to same release, not CentOS 6.7, as I havn't updated to 6.8 yet; at the virtual server I find this export LS_OPTIONS="--human --color=always" alias ls='ls $LS_OPTIONS' alias ll='ls $LS_OPTIONS -l' alias l='ls $LS_OPTIONS -Al' in /root/.bashrc on my virtual machines I can't find this settings; nor doesn't 'env' show a variable 'LS_OPTIONS' but 'alias' shows this: alias cp='cp -i' alias l.='ls -d .* --color=auto' alias ll='ls -l --color=auto' alias ls='ls --color=auto' alias mv='mv -i' alias rm='rm -i' alias which='alias | /usr/bin/which --tty-only --read-alias --show-dot --show-tilde' the aliases for cp, mv, rm are explained by the first part of /root/.bashrc (not quoted above) alias rm='rm -i' alias cp='cp -i' alias mv='mv -i' when I comment out the above shown part of /root/.bashrc on the virtual server 'alias' shows the same as on my virtual machines (VMware) but where are these aliases alias l.='ls -d .* --color=auto' alias ll='ls -l --color=auto' alias ls='ls --color=auto' alias which='alias | /usr/bin/which --tty-only --read-alias --show-dot --show-tilde' set? Thanks for help, Walter

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