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Question on failing hard drives
by Jimmy Bradley 14 Feb '08

14 Feb '08

In my Cent OS machine, I have 3 hard drives, an 80, and two 200gig hard drives. One of the drives is obviously starting to fail, but I'm not sure which one. Is there a command line command in Linux that will check the drive integrity on all the hard drives and tell me which one is going bad? Thanks Jim

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Lock session vs. End session
by Anne Wilson 14 Feb '08

14 Feb '08

In security terms, is there any difference between ending a session (logout of X) and locking a session? Anne

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Booting without a keyboard
by Gregory P. Ennis 14 Feb '08

14 Feb '08

Everyone, Is there a way to have Centos boot when no keyboard is present. I have a firewall and another mail server that would fit into a closet a little better without a keyboard. I tried to remove the keyboard but the system hangs giving me notice that a keyboard was not found. Greg Ennis

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Re: [CentOS] How can I stop the eject of the DVD after install?
by David G. Miller 14 Feb '08

14 Feb '08

Lundgren, Andrew" <Andrew.Lundgren(a)Level3.com> wrote: > I have created my own install DVD with a custom kickstart file and modified the isolinux.cfg file to allow the system to boot off of the hard disk as the default mode. It will also use my kickstart file if I select it. > > Now I would like to make the system not eject the DVD after reboot. The machines I am installing on do not have a motorized tray that can automatically pull the DVD back in when a mount command is issued. You have to push the disk in manually. As these machines will be unattended that is not idea. > > How can I prevent the installer from ejecting the DVD once the install is complete? > > Thanks! > > -- > Andrew Lundgren But won't the systems then just boot from the install DVD? Or are you overriding the BIOS boot order to start the install? Cheers, Dave -- Politics, n. Strife of interests masquerading as a contest of principles. -- Ambrose Bierce

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limit number of per-vhost or per-user cgi processes?
by J. Potter 14 Feb '08

14 Feb '08

Hi List, Is there a way to limit the number of cgi processes Apache's suExec will fork for a given vhost or given user? (either solution is fine) suExec doesn't honor the /etc/security/limits.conf nproc value. mod_throttle seems to be dead; and I can't figure out if selinux might be able to manage this (although would rather not flip selinux from permissive to enabled). What are others doing? Thanks! -Jeff

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versions of the mail command
by Nigel Kendrick 14 Feb '08

14 Feb '08

Hi Folks, I am running postfix on a CentOS 4 box and was playing around with mail autoresponders. I came across a wiki article that did the trick, except for the following line which is what sends the auto response: mail -s"Subject here" -a"From: <$2>" $1 < /etc/postfix/autoreply.txt The (minor) issue is that the mail command doesn't have the '-a' switch to change the sender so I just removed that part. It's not a biggie but is there an updated version of the mail command or an alternative I could use that would pick up the sender's name variable and use it? Thanks Nigel Kendrick

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ccache on CentOS?
by Niki Kovacs 14 Feb '08

14 Feb '08

Hi, Before using CentOS, I've spent a few years with Slackware. This distribution doesn't come with many packages, so I had the habit of building a lot of stuff myself. One of the first things I installed was ccache, a compiler cache that accelerates (re)building significantly. Has anyone ever setup ccache on CentOS? I'd be glad to find a little HOWTO. Cheers, Niki

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Re: Disk partitions and LVM limits - SUMMARY
by Peter Blajev 14 Feb '08

14 Feb '08

Thank you all for the help. I'm writing this summary message because of people requests. I haven't tried all of this. I just collected it and organized it. You've got a big storage. Now what? The short answer is: "Just connect it. It should work." I'll play safe by saying that the following applies to <10TB storage. Some people reported file systems of 80TB. Things to watch out for: - Make sure the driver you are using or the storage itself don't restrict you from making big partitions or file systems. - fdisk creates partitions up to 2.1TB in size. Use "parted" instead. - RHEL5 supports up to 8TB ext3 file system. To create bigger then 8TB use option "-F" and 4K blocks. Your options are: - If the storage is connected to a RAID controller you can use the controller to create smaller logical partitions. Then combine them with LVM. - If you really want to partition the drive use parted. While partitioning if you run into this message: === sdb: very big device. try to use READ CAPACITY(16). SCSI device sdb: 10248519680 512-byte hdwr sectors (5247242 MB) sdb: Write Protect is off === you can just ignore it. It's informational (based on a few people replies). If you don't like parted you can still use fdisk to create a few 2TB partitions and then use LVM. - Use LVM on the raw device. Don't partition. This is what I did and it worked for me. Make sure you wipe out the MBR first: dd if=/dev/zero of=/dev/sdX bs=512 count=63 (count=1 should work too but 63 won't hurt either) Create the pv, vg and lv: pvcreate /dev/sdX vgcreate <vg name> /dev/sdX lvcreate -L <size> -n <name> -v vg_name Now you have to create the file systems. Some people recommend XFS. If you try to create bigger then 8TB ext3 file system make sure you use option "-F" and 4K blocks: mkfs -t ext3 -F -b 4096 /dev/vg00/lvol01 For more information: http://www.centos.org/product.html http://kbase.redhat.com/faq/FAQ_103_11461.shtm The email thread "Disk partitions and LVM limits" in CentOS, RedHat and RedHat-Sysadmin mailing lists. Thank you Peter > Hi, > > I've got a DAS DELL MD1000 with a bunch of SATA drives in RAID 5 > configuration with total space of 5.4TB. This box is attached to a > CentOS5 system (kernel 2.6.18-53.1.6.el5). > > Any idea how to make this space usable? > Is there a limit how big a partition can be? What is the work around? > Is there a limit how big a file system ca be? > > I've tried to partition it but no matter how bug partition I create > fdisk spits out these messages on the console: > --- > sdb: very big device. try to use READ CAPACITY(16). > SCSI device sdb: 10248519680 512-byte hdwr sectors (5247242 MB) > sdb: Write Protect is off > --- > > I decided to not partition the drive and use LVM but the physical volume > stopped at 2TB. > > So, right now I can't use LVM because of this 2TB limit and I'm not sure > if I partition the drive how good these partitions are because of the > the message from fdisk. > > Any help or idea is highly appreciated. > > Thank you > Peter

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vncviewer and opening mail attachemtns kills the login
by Jerry Geis 14 Feb '08

14 Feb '08

I am running centos 5.1 I routinely vnc in from home (centos 5.1 NVIDA laptop) to work centos 5.1 NVIDIA based station. works fine 95% of the time. However, when I am running thunderbird mail client, and there is PDF attachment, clicking on the attachment it prompts to open with evince and I accept - my entire sessions is KILLED. When I reconnect I have been logged out and all my windows etc... are gone. Is there a reason for this behavior and if so how do I stop it? Thanks, Jerry

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using fping to find missing A records
by Rogelio 14 Feb '08

14 Feb '08

I have a specific question on how to do something, and a larger question addressing other "better" ways to do the spirit of what I'm asking. I'm setting up Nagios, and am trying to make sure that all of the subnets have A records, as IP addresses will be changing very, very rapidly, and when that day comes, I will not be here (but on another Nagios project). So, I'd like to create A records for each host. How do I "fping -a" a range of IP addresses, strip out the names of the name that the host replies with, and then ping that list of names? (You don't have to tell me how exactly, a general idea of which command line tools will do) I'm thinking something like: fping -g 192.168.1.0 192.168.1.255 -A | grep whatever > file, and then shove that file in another fping statement.

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