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since CentOS 5.6 upgrade, squid crashes
by Laurent CREPET 10 May '11

10 May '11

Hi, I have recently upgraded our web proxy to CentOS 5.6. Before the upgrade, squid was running fine. Since the upgrade, sometimes, squid crashes: > [root@stargate ~]# service squid status > squid dead but pid file exists Looking at log files, I think it could be related to logrotate stuff, > -rw-r----- 1 squid squid 42713088 May 3 04:02 store.log > -rw-r----- 1 squid squid 8192 May 3 04:02 cache.log > -rw-r----- 1 squid squid 35778160 May 3 04:02 access.log I will look at the latest RPMs to check differences on /etc/logrotate.d/squid. Laurent. -- Laurent CREPET <lct(a)megrapet.fr>

8 20

Am I being to paranoid?
by Jason 09 May '11

09 May '11

Hi All, I want to know thoughts on if I am being to paranoid/security conscious. CentOS 5.6, Apache, MySQL, running an Firewall in front of everything and obviously the built-in firewall on the box. I have ssh on a different port and starting to use Keys instead of password authentication. I host an intensive website and I am getting about 150 unique visitors per day. What I am seeing is LogWatch reporting a lot of 404's like: 404 Not Found //PHPMA/: 1 Time(s) //admin/myadmin/: 1 Time(s) //admin/phpmyadmin/: 1 Time(s) //adming/: 1 Time(s) //ascils/phpmyadmin/: 1 Time(s) //blog/wp-content/plugins/phpmyadmin/: 1 Time(s) //database/: 2 Time(s) //db/: 1 Time(s) //dba/: 1 Time(s) //dbadmin/: 2 Time(s) //html/phpMyAdmin/: 1 Time(s) //html/phpmyadmin/: 1 Time(s) //lamp/phpmyadmin/: 1 Time(s) //myadmin/: 1 Time(s) //mydatabase/: 1 Time(s) //mydb/: 1 Time(s) //myphp/: 1 Time(s) //mysql-admin/: 1 Time(s) //mysql/: 1 Time(s) //mysqladmin/: 2 Time(s) //mysqlmanager/: 1 Time(s) //phpMyAdmin-2.8.0.2/: 1 Time(s) //phpMyAdmin-2.8.1-rc1/: 1 Time(s) //phpMyAdmin-2.8.1/: 1 Time(s) //phpMyAdmin-2.8.2/: 1 Time(s) //phpMyAdmin/: 1 Time(s) //phpadm/: 2 Time(s) //phpma/: 1 Time(s) //phpmanager/: 1 Time(s) //phpmy/: 2 Time(s) //phpmyadmin/: 1 Time(s) //pma/: 1 Time(s) //pmaadmin/: 1 Time(s) //pmadmin/: 1 Time(s) //sql/: 1 Time(s) //sqladmin/: 2 Time(s) //sqldatabase/: 2 Time(s) //sqlmanager/: 1 Time(s) //sqlweb/: 1 Time(s) //typo3/phpmyadmin/: 1 Time(s) //webadmin/: 1 Time(s) //webdb/: 1 Time(s) //websql/: 1 Time(s) //wp-content/plugins/phpMyAdmin/: 1 Time(s) //wp-content/plugins/wp-phpmyadmin/: 1 Time(s) //xampp/phpmyadmin/: 1 Time(s) So I turned on Apache ReWrite and I created a file and I put in rules like: (just a small subset) RewriteCond %{REQUEST_URI} ^/php(.*) [NC,OR] RewriteCond %{REQUEST_URI} ^/phpmy(.*) [NC,OR] RewriteCond %{REQUEST_URI} ^/phpma [NC,OR] RewriteCond %{REQUEST_URI} ^/phpmyadmin [NC,OR] RewriteCond %{REQUEST_URI} ^/phpadmin [NC,OR] RewriteCond %{REQUEST_URI} ^/phpgadmin [NC,OR] RewriteCond %{REQUEST_URI} ^/phppgadmin [NC,OR] RewriteCond %{REQUEST_URI} ^/phpmyadmin(.*) [NC,OR] RewriteCond %{REQUEST_URI} ^/php\-my\-admin [NC,OR] RewriteCond %{REQUEST_URI} ^/php\-myadmin [NC,OR] RewriteCond %{REQUEST_URI} ^/phpmy\-admin [NC,OR] RewriteCond %{REQUEST_URI} ^/phpmanager [NC,OR] RewriteCond %{REQUEST_URI} ^/player(.*) [NC,OR] RewriteCond %{REQUEST_URI} ^/plugins [NC,OR] RewriteCond %{REQUEST_URI} ^/pma [NC,OR] RewriteCond %{REQUEST_URI} ^/p/m/a [NC,OR] RewriteCond %{REQUEST_URI} ^/pmadmin [NC,OR] RewriteCond %{REQUEST_URI} ^/pmaadmin [NC,OR] RewriteCond %{REQUEST_URI} ^/scripts [NC,OR] RewriteCond %{REQUEST_URI} ^/sd(.*) [NC,OR] RewriteCond %{REQUEST_URI} ^/sql [NC,OR] RewriteCond %{REQUEST_URI} ^/sqladmin [NC,OR] and if one of these is hit I use a Rule of: RewriteRule .* http://%{REMOTE_ADDR}%{REQUEST_URI} [L,R=301,QSA] Everyday I look at the LogWatch E-Mail and I add one people are trying to hit and restart apache. This yields a few questions. 1. Am I being to paranoid by doing this? My logic is they dont belong here and I could get mad if someone walked up to my apartment and tried jiggling the door handle to see if it was unlocked. 2. I know I can simplify these rules. Wouldn't RewriteCond %{REQUEST_URI} ^/php(.*) [NC,OR] get most of the attempts for thinks like /php, /php-myadmin, /phpmyadmin-2.0.8.8, etc? 3. Is there a better way to right these rules? 4. Why does LogWatch show this to me as a 404 , when a rewrite rule is hit and they are re-directed back to themselves? My rules seem to be working, if I try and hit /scripts right now, it does what I expect. Can anyone shed some light for me on my thoughts/questions? -- Jason

13 15

hardware issues under 5.6
by mark 09 May '11

09 May '11

Folks, This is, umm, odd. Two, at least, and possibly a third over the weekend, of some older Dell 1950's, suddenly died shortly after being upgraded to 5.6. They're all about the same age, and it's not happening with other systems, but they claim a scsi abort, and the f/s goes read-only. The little lcd screen goes orange, and shows a fatal error E 171, and B0 F3 D0? D0 F3 B0? I forget, and won't be able to double check my memory till the morning. Has anyone seen this, with a f/s suddenly going r/o, on machines that seemed to be running fine for years? Since this is two? three machines, that's somewhere between "coincidence" and "enemy action". mark

3 3

Building a Back Blaze style POD
by Jason 09 May '11

09 May '11

Hi All, I am about to embark on a project that deals with allowing information archival, over time and seeing change over time as well. I can explain it a lot better, but I would certainly talk your ear off. I really don't have a lot of money to throw at the initial concept, but I have some. This device will host all of the operations for the first few months until I can afford to build a duplicate device. I already had a few parts of the idea done and ready to get live. I am contemplating building a BackBlaze Style POD. The goal of the device is to start acting as a place to have the crawls store information, massage it, get it into db's and then notify the user the task is done so they can start looking at the results. For reference here are a few links: http://blog.backblaze.com/2009/09/01/petabytes-on-a-budget-how-to-build-che… and http://cleanenergy.harvard.edu/index.php?ira=Jabba&tipoContenido=sidebar&si… There is room for 45 drives in the case (technically a few more). 45 x 1tb 7200rpm drives is really cheap, about $60 each. 45 x 1.5tb 7200rpm drives are about $70 each. 45 x 2tb 7200rpm drives are about $120 each 45 x 3tb 7200rpm drives are about $180-$230 each (or more, some are almost $400) I have question before I commit to building one and I was hoping to get advice. 1. Can anyone recommend a mobo/processor setup that can hold lots of RAM? Like 24gb or 64gb or more? 2. Hardware RAID or Software RAID for this? 3. Would CentOS be a good choice? I have never used CentOS on a device so massive. Just ordinary servers, so to speak. I assume that it could handle so many drives, a large, expanding file system. 4. Someone recommended ZFS but I dont recall that being available on CentOS, but it is on FreeBSD which I have little experience with. 5. How would someone realistically back something like this up? Ultimately I know over time I need to distribute my architecture out and have a number of web-servers, balancing, etc but to get started I think this device with good backups might fit the bill. I can be way more detailed if it helps, I just didn't want to clutter with information that might not be relevant. -- Jason

5 14

Typing "startx" gives me a black scrren, have to reboot to get back to runlevel 3
by Gilbert Sebenste 09 May '11

09 May '11

Hello everyone, I have been having a vexing problem for a year, and I cannot solve it. Hopefully, someone has a tip to get me over the hump to fix this once and for all. When I type "startx" from root, I get: (EE) fglrx(0): atiddxDriScreenInit failed, GPS not been initialized. (WW) fglrx(0): *********************************************** (WW) fglrx(0): * DRI initialization failed! * (WW) fglrx(0): * (maybe driver kernel module missing or bad) * (WW) fglrx(0): * 2D acceleraton available (MMIO) * (WW) fglrx(0): * no 3D acceleration available * (WW) fglrx(0): ********************************************* * (II) fglrx(0): FBADPhys: 0xf00000000 FBMappedSize: 0x10000000 (WW) fglrx(0): Failed to set up write-combining range (0xd0000000,0x10000000) I get a ton of stuff before this, but just info messages. Where should I start looking to fix this problem? I use the Redhat experimental kernels at http://epople.redhat.com/jwilson/el5/. Running CentOS 5.6, fully patched as of this morning with the gdb/OO updates. ******************************************************************************* Gilbert Sebenste ******** (My opinions only!) ****** Staff Meteorologist, Northern Illinois University **** E-mail: sebenste(a)weather.admin.niu.edu *** web: http://weather.admin.niu.edu ** *******************************************************************************

2 3

HP MicroServer
by Timothy Murphy 09 May '11

09 May '11

A bit OT, but I'm running CentOS-5.6 on this machine (in fact on two of them) and it seems to run perfectly - I've had no problems at all. Except that I'd like to add a second ethernet port, and am not sure where one can find a card that will fit this machine. As far as I can see, it requires a half-height PCIe card, which seems to be rather a rare animal. (There doesn't seem to be a standard for the backplate.) So I'm wondering if anyone has tried this? Incidentally, is there a forum anywhere for users of the MicroServer under Linux? (The machine is unbelievably cheap at the moment, due to a bizarre cashback offer from HP.) -- Timothy Murphy e-mail: gayleard /at/ eircom.net tel: +353-86-2336090, +353-1-2842366 s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland

5 11

Another system with no sound
by Alfred von Campe 09 May '11

09 May '11

I am also having an issue with no sound on some CentOS desktop systems. I manage about 3 dozen desktops. These are all Lenovo ThinkCentre systems of varying vintages, but there are only 2 distinct sound controllers among all of them: 00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 02) 00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio Controller (rev 01) On some systems, the sounds is working fine, and on others it's not. It's not a sound controller issue, as I've got sound working on multiple systems with each controller. I've checked the settings in alsamixer and the master is not muted. As far as I can tell, all systems are configured similarly (they were build via kickstart and maintained up-to-date with "yum update" periodically). Here is some info from a system on which sound is working: # lspci | egrep -i 'audio|sound|snd|alsa' 00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 02) # lsmod | egrep -i 'audio|sound|snd|alsa' snd_hda_intel 523949 0 snd_seq_dummy 7877 0 snd_seq_oss 32577 0 snd_seq_midi_event 11073 1 snd_seq_oss snd_seq 49585 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi_event snd_seq_device 11725 3 snd_seq_dummy,snd_seq_oss,snd_seq snd_pcm_oss 42817 0 snd_mixer_oss 19009 1 snd_pcm_oss snd_pcm 72133 2 snd_hda_intel,snd_pcm_oss snd_timer 24516 2 snd_seq,snd_pcm snd_page_alloc 14281 2 snd_hda_intel,snd_pcm snd_hwdep 12869 1 snd_hda_intel snd 55877 9 snd_hda_intel,snd_seq_oss,snd_seq,snd_seq_device,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer,snd_hwdep soundcore 11553 1 snd And here is the same info from a system where sound is not working: # lspci | egrep -i 'audio|sound|snd|alsa' 00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 02) # lsmod | egrep -i 'audio|sound|snd|alsa' snd_hda_intel 523949 1 snd_seq_dummy 7877 0 snd_seq_oss 32577 0 snd_seq_midi_event 11073 1 snd_seq_oss snd_seq 49585 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi_event snd_seq_device 11725 3 snd_seq_dummy,snd_seq_oss,snd_seq snd_pcm_oss 42817 0 snd_mixer_oss 19009 1 snd_pcm_oss snd_pcm 72133 2 snd_hda_intel,snd_pcm_oss snd_timer 24516 2 snd_seq,snd_pcm snd_page_alloc 14281 2 snd_hda_intel,snd_pcm snd_hwdep 12869 1 snd_hda_intel snd 55877 11 snd_hda_intel,snd_seq_oss,snd_seq,snd_seq_device,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer,snd_hwdep soundcore 11553 1 snd Similar, but not quite identical. The settings in alsamixer, however, are identical. Any ideas as to what I can try next? Thanks, Alfred

2 2

Finding wich files a writen to
by Nicolas Ross 09 May '11

09 May '11

Hi ! I have a server (Centos 5) that is using a pair of SAS drives to store the data. (Mail server) They are on an adaptec raid controler with a battery backup and write back cache active. >From time to time, I have sever peak io to those data disks (> 400 to 500 iops, > 70 to 100 megs/sec). With iostat, I find that it's almost a write i/o problem. How can I find to which files the OS writes ? On OSX boxes, there is a utility called fs_usage that can reports any disk activity for a particular process or all processes. Is there any utility like this on Centos ? iotop can points me to wich process, but that doesn't points me to what files are the culprits...

7 9

How to add a HD to a LVM
by Todd Cary 08 May '11

08 May '11

I have connected a HD that was a prior system drive (Centos 4.8) and I am not sure of the command line procedures to find out if it is recognized (I believe it is since it present in the GUI), delete all data on it and finally add it to the LVM. I would like to use it as a backup data drive. Todd -- Ariste Software Petaluma, CA 94952 http://www.aristesoftware.com

7 11

SSH using Keys, no password and SFTP?
by Jason 08 May '11

08 May '11

HI All, I have setup (and it was so easy) using SSH with keys instead of password authentication. I want to turn password authentication off completely. What I dont understand is how SFTP would work them. I dont see any settings in my FTP clients to use SFTP without providing a password. If that is the case, that is fine since the FTP users have no real privileges except to their own web folders. That being said, is it possible to allow only Password authentication for a few users? and then require Key authorization for other users where password would not be accepted for them..perhaps, if they try to connect with password they get denied without being prompted for a password? -- Jason

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