Discuss June 2006

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217 participants
235 discussions

EXT3-fs error (devive dm-0) in start_transaction: Journal has aborted
by Alfred von Campe 03 Aug '06

03 Aug '06

My recently installed CentOS 4.3 system (which is the kickstart server for other systems -- see other thread) is currently hung. I can ping it, but can't do much of anything else. When I switch to one of the virtual consoles, I can briefly see the "login:" prompt, but then that window immediately fills with up with the following message: EXT3-fs error (devive dm-0) in start_transaaction: Journal has aborted This is displayed over and over again. I used the default (automatic) partitioning scheme, so the root file system is an ext3 partition on a logical volume that spans most of the disk (everything except for the swap partition and /boot). Anyone else seen this? Any ideas as to what would cause this? I'll be rebooting the system shortly... Alfred

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Centos 4.3/ 64-bit: Java/ Tomcat Optimization
by Karl R. Balsmeier 27 Jul '06

27 Jul '06

Hi, I have been steadily migrating machines, about 50-70 of them to Centos 4.3, mostly using Opteron Dual Core/ Tyan boxes of Supermicro origin. They perform apache, mysql, tomcat and qmail work, depending where they exist The main reason from the programmer side (i'm a sysadmin/ engineer) is the larger "heap size" to satisfy some of the needs. Since Java/Tomcat applications can also be I/O intensive, i'm looking at things from the systems side to improve on, kernel settings, filesystem choice, RAID configuration, etc. Is there anyone out there in the Centos 4.3 community that's looking at similar optimation interests, and if so, what have you found thus far? Mostly i'm curious about stability, features, bugs and other aspects native to Centos 64-bit/4.3 and running Tomcat/ Java on it. Right now we are at Java 1.4, but will likely make the jump to 1.5 within the next 180 days. So far the developers are happy with the first box I made for them, but I did not customize the kernel, or make any in-depth adjustments, just handed them a larger heap size and they seemed quite happy with that in itself. Clustering, keeping alot of single machines separate, getting one large machine with alot of mem/cpu/i/o capacity, these are all being examined. Just curious what you think, or if you know of any great resources on the subject. I'm in a similar boat wih regard to Mysql, but that's another story, and I have alot of actual research on that to share. -karlski

3 3

Appended 1 in fstab entries CentOS4.X installs
by Chris Weisiger 24 Jul '06

24 Jul '06

In my /etc/fstab here is just a snippet LABEL=/1 ....<rest of line> LABEL=/boot1 ....<rest of line> When i installed centOS-4.3 and it has appeared after starting to use any version of centOS4 was that the labels in my fstab were getting the "1" appended to each label... but if the all the labels for my partitions are appended with the "1" and i format and reload they show up in my partition setup during installation and i re-label them appropriately without the "1" and the /etc/fstab doesnt have the "1" appended... its like every other install the "1" gets appended....anyone come across this... if show how can i change it....i know its not like it makes a difference but I just noticed wondering why this happens.

4 3

Intel VT-x & Xen
by Bill Baird 24 Jul '06

24 Jul '06

Hi All, Just curious if anyone is currently using Xen 3on any of the new Intel Xeon processors that support the VT-x extentions. With the VT-x (or AMD's Pacifica) you can run unmodified guest operating systems...so we are looking into buying a new server to run a few virtual machines of CentOS & a few with Windows. If anyone has done this, I would love to hear about their success/struggles...Thanks! --Bill Bill Baird Phoenix Marketing International | Director of Technology 6423 Montgomery Street, Suite 12 | Rhinebeck, NY 12572 845-876-8228 x311- Office | 203-545-0437 - Mobile http://www.phoenixmi.com/

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VMWare disaster recovery?
by Les Mikesell 17 Jul '06

17 Jul '06

I found this in the large and growing list of downloadable vmware appliances: http://www.vmware.com/vmtn/appliances/directory/316. I haven't run it yet, but it claims to provide a way to mirror running windows boxes over iscsi to vmware disk images, then allows you to boot that image under vmware as a replacement for the server with little downtime. Has anyone attempted something like this with Centos - or know if software mirrors work over iscsi? -- Les Mikesell lesmikesell(a)gmail.com

3 4

LVM repairing or back to regular ext3?
by Paul 16 Jul '06

16 Jul '06

Can anyone point me in the right direction for correcting errors on an HD when using LVM? I've tried e2fsck and indicates bad block. I've tried with -b 8193, 16384, and 32768 and no good. I've found some info about reiserfsck on google, but this utility doesn't seem to be included in Centos4.3. I did find it on my old FC1 box. I am thinking now I really should have went with just regular 83 Linux ext3 partitions. Arrgghhh. And if I want to switch to 83 Linux instead of 8e LVM, whats the best way, or at least a feasible way? I can pop another drive in if I need to move data around, but I don't see how, as I can't mount the LVM partition (hda2). -- ^^^^^^^^^^^^| || \ | Budvar ######|| ||'|"\,__. | _..._...______ ===|=||_|__|...] "(@)'(@)""""**|(@)(@)*****(@)I

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RE: [CentOS] Simple backup program
by Bowie Bailey 14 Jul '06

14 Jul '06

Les Mikesell wrote: > On Wed, 2006-06-14 at 13:09 -0400, Bowie Bailey wrote: > > > > I am looking for a simple backup program that I can use to > > > > backup a CentOS box to a local tape drive. > > > > http://flexbackup.sf.net > > > > > > I used that for years, but the network grew and needed a "bigger" > > > solution so I switched to backuppc which is working great. > > > > I'm using backuppc. I just need something to dump the backuppc > > machine to tape for an offsite or last-resort backup. The problem > > is that backuppc is currently using 161GB (compressed) and the > > tapes only hold 40GB each, so I need something with some sort of > > intelligent tape-spanning capability. > > You are going to have more trouble than that. Backuppc will have > millions of hardlinks in that 161GB and nearly all file oriented > backup programs will take an impractical amount of time to deal > with them. And restoring will be even worse - basically everything > ends up building a table of inode numbers and scanning it for a match > on every hardlink. True, but this will only be used as a last-case scenario for restores, so in that case I'm willing to wait a bit. > > I haven't seen flexbackup. I'm currently evaluating afbackup. > > You really want a matching external hard drive so you can > dd an image copy to it. There has been quite a bit of discussion > on this topic on the backuppc mail list and I'm not sure anyone > has come up with an ideal solution. Or, you can use the 'archive > host' feature of backuppc to generate tar images of backup runs > optionally compressed and split to fit your media, but these > are copies of individual hosts and you loose the pooling feature. I agree that hard drives are faster, larger, and cheaper than tapes, but I can drop a tape onto a concrete floor and reasonably expect it to work afterwards. A hard drive might still work, but I wouldn't want to bet on it. -- Bowie

3 2

format fat32 filesystem
by Mark Quitoriano 13 Jul '06

13 Jul '06

Hi, when i run mkfs using this command mkfs -t vfat /dev/sda5 i get this mkfs.vfat: No such file or directory is there a module i need to install to support vfat? -- Regards, Mark Quitoriano, CCNA Fan the flame... http://www.spreadfirefox.com/?q=user/register&r=19441

3 4

SATA RAID Cards
by WipeOut 11 Jul '06

11 Jul '06

Hi, Which SATA RAID cards work natively on Centos 4.x?? I have heard that the only one supported is the 3ware cards but not sure if that requires a driver to be added or if it just works out the box.. Also would like to know of alternatives.. Thanks..

8 9

Apache Security
by Matthew T. O'Connor 09 Jul '06

09 Jul '06

Hello, I have a server running CentOS 4.3 with all the latest updates. The server in question has been hacked by spammers a few times. The details of the hack have been basically the same every time. I find some directory created by the apache user account in /tmp. The new directory contains an html file, and a list of email addresses to spam and a perl script that spams all those email addresses with the html file. My question is why is this happening? Obviously it's some apache exploit. I have removed mod_perl, that didn't help. I have now changed the permissions on the perl executable, that might help we will see, but that doesn't address the core problem. How is it that someone can upload arbitrary files to my server and then execute an arbitrary command via apache. Is this a know problem? Have others seen it? What can I do to help prevent this? Thanks, Matt

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Discuss June 2006