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34753 discussions

Right way to set IO scheduler on CentOS
by Amos Shapira 06 Nov '09

06 Nov '09

Hello, I'd like to set the io scheduler on some of the disks on our Dom0 (CentOS 5) to "deadline". The way I found to do this is with "echo deadline > /sys/block/sdb/queue/scheduler". What is the Right Way(TM) to set this automatically during boot? I sort of expected to use sysctl but it appears to only deal with pseudo-files under /proc/sys, not /sys. Also "sysctl -a" doesn't list such options. Searching the web also only comes up with the "echo" method mentioned everywhere. Is my only way to add some /etc/init.d script or /etc/rc.local line? Thanks, --Amos

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Re: [CentOS] Curious behaviour of openvpn
by Ben Damon 06 Nov '09

06 Nov '09

This happened to me after updating to 5.4 as well. Except mine have not come back. My OpenVPN configuration has been used for a couple years. This is what I am seeing in the log. TLS Error: TLS key negotiation failed to occur within 60 seconds (check your network connectivity) TLS Error: TLS handshake failed > > I noticed that when I went over to CentOS-5.4 > on my server (and re-booted), > my openvpn connections failed for a couple of hours, > and then came back. > > Has anyone noticed this? > > What puzzled me was that the tun0 interface > was present on all machines (according to ifconfig) > but the connections seemed to be lost. >

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Can't Display Python
by Victor Subervi 06 Nov '09

06 Nov '09

Hi; Been a while since I had root access to a server and without GUI. I uploaded and tried to surf to this page: http://209.216.9.56/global_solutions/index.py?w=1024 but the code is displayed, not executed. Is it that I need to inform Apache that *.py files are to be interpreted by python? Please advise, and if easy, tell me what to do. TIA, Victro

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SMART errors
by Michael A. Peters 06 Nov '09

06 Nov '09

I dumpster dived an older low end Dell (actually, found it in a field in a fresh dump pile). Case looked good, only flaws appeared to be missing cdrom bezel and the heat sink clamp was off (but not broken). After cleaning cpu/heat sink and fresh thermal paste, I found out why it was dumped - the internal hard drive was bad, and the optical drive is going bad. I had an old 80 GB Seagate and the optical drive was good enough to boot the boot.iso and do a network install, so I put CentOS 5.4 on it. It is working extremely well as a small headless server, but my Seagate drive has given some SMART errors. This is a drive that has been out of service for several years, I had 60GB worth of flac files on it, and had no trouble getting them off before formatting (and all matched their md5sum). It appears all the errors happen at boot - IE Error 10 occurred at disk power-on lifetime: 1248 hours (52 days + 0 hours) When the command that caused the error occurred, the device was active or idle. After command completion occurred, registers were: ER ST SC SN CL CH DH -- -- -- -- -- -- -- 84 51 00 65 69 db e1 Error: ICRC, ABRT at LBA = 0x01db6965 = 31156581 Commands leading to the command that caused the error were: CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name -- -- -- -- -- -- -- -- ---------------- -------------------- c8 00 10 65 69 db e1 00 00:37:33.571 READ DMA c8 00 08 7d 4b db e1 00 00:37:33.515 READ DMA c8 00 30 4d 4b db e1 00 00:37:33.458 READ DMA c8 00 40 65 48 db e1 00 00:37:33.456 READ DMA c8 00 28 3d 48 db e1 00 00:37:33.419 READ DMA etc. - and no errors since boot. Is that drive about to go south, or are the errors just symptoms of it being older? Are there steps I should take? drive info: === START OF INFORMATION SECTION === Model Family: Seagate Barracuda ATA IV family Device Model: ST380021A Serial Number: 3HV09PHE Firmware Version: 3.05 User Capacity: 80,026,361,856 bytes Device is: In smartctl database [for details use: -P show] ATA Version is: 5 ATA Standard is: Exact ATA specification draft version not indicated Local Time is: Fri Nov 6 10:36:25 2009 PST SMART support is: Available - device has SMART capability. SMART support is: Enabled === START OF READ SMART DATA SECTION === SMART overall-health self-assessment test result: PASSED -=- Thanks for any suggestions.

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recommend benchmarking SW
by Alan McKay 06 Nov '09

06 Nov '09

Hey folks, We've got some new hardware and are trying to figure out what best to do with it. Either run CentOS right on the bare metal, or virtualize, or several combination options. Mainly looking at : - CentOS on bare metal - CentOS on ESXi 4.0 with local disk - CentOS on ESXi with 1 VM running Openfiler to serve disk to other VMs And want to benchmark these 3 scenarios So far all we have is a dd-based disk IO benchmark. What else can you all recommend. BTW, we also ideally want to try each of the above with a Postgres DB as well (and once without) thanks, -Alan -- “Don't eat anything you've ever seen advertised on TV” - Michael Pollan, author of "In Defense of Food"

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Long tar -x: Box Shuts Down
by Mike -- EMAIL IGNORED 06 Nov '09

06 Nov '09

My Centos 5.2 box shuts itself down during a long tar -x. There is plenty of disk available. This is new; it worked in the past. Any suggestions? Thanks, Mike.

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Missing yum-priorities in 5.4?
by Morten Torstensen 06 Nov '09

06 Nov '09

I am looking for yum-priorities or any info on any changes here for CentOS 5.4. There is also a forum post for this here: <https://www.centos.org/modules/newbb/viewtopic.php?topic_id=22798&forum=37> Is this missing on purpose? Function merged with another yum package? Or is it just missing as an oversight? -- //Morten //morten(a)mortent.org

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Re: [CentOS] [Samba] Accessing Windows file-system from Linux samba server
by Craig White 06 Nov '09

06 Nov '09

On Wed, 2009-11-04 at 10:43 +0000, Timothy Murphy wrote: > Adam Nielsen wrote: > > > When you mount the share, specify a Windows username to connect as > > (mount ... -o username=tim) > > Thanks for your response. > But sadly, this does not make the slightest difference. > Incidentally, the machine is running Windows XP Pro, > and I am the Administrator. > > I can browse in one share, but not the other, > although as far as I can see everything about them is identical, > except that they are on different drives: > > ----------------------------------------- > [root@helen ~]# mount -t cifs -o user=tim,password=****,rw //harriet/EAGD > /mnt/win > [root@helen ~]# ls /mnt/win > The Sims 2 > [root@helen ~]# umount /mnt/win > [root@helen ~]# mount -t cifs -o user=tim,password=****,rw //harriet/EAGC > /mnt/win > mount error 13 = Permission denied > Refer to the mount.cifs(8) manual page (e.g.man mount.cifs) > ----------------------------------------- ---- no matter how many lists you ask or how many different ways you want to keep asking the question, your problem is always Windows permissions are blocking you. This is not a Linux question. If you don't have permissions to mount a share or descend into a subdirectory, your problem lies with Windows permissions. Your first example demonstrates that it works. Your second example demonstrates that a permissions issue from the Windows 'server' is blocking you. There's no guarantee that even if you are the administrator that you can access a share, folder or file. Windows has a fairly sophisticated ACL system and you would probably be better served learning it than asking so many lists the same questions. Craig -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

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Apache Not Serving, But Is Serving?
by Victor Subervi 06 Nov '09

06 Nov '09

Hi; I installed yum install mod_python and all went well. So I thought it would be appropriate to reboot apache apachectl -k restart and it appeared well but the pages don't load (they hang). Nevertheless, # ps wax|grep httpd 12179 ? Ss 0:00 /usr/sbin/httpd 17698 ? Z 0:00 [httpd] <defunct> 17703 pts/0 S+ 0:00 grep httpd So what gives? Please advise. Victor

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vsFTP Question
by Victor Subervi 06 Nov '09

06 Nov '09

Hi; Now that it's installed, how do I start it and add a user? I can hardly believe there is *no* documentation! TIA, Victor

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