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• concrete uses of LDAP?

  - by ajsie

  im new to LDAP. i wonder what are some concrete examples of using LDAP. things that are MUCH more easier to do when you got 3-7 linux computers in a small company network. one use that is very important for me seems to be that you configure LDAP to handle system authentication. then you dont have to create same accounts in all computers. are there other things that are a MUST DO for a small network to save more time? my small network is for apache servers and database servers. and should LDAP be in an own machine? cause i guess its not good to put it in apache or database servers since these are performance dependent.

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• After Upgrading Ubuntu to 9.10 my hard drive now has a warning.

  - by Sean

  it is a 500gb hard drive format as ext3 path /dev/sdc1 The disk utility does not even see this. This Warning is from gparted: e2label: No such device or address while trying to open /dev/sdc1 Couldn't find valid filesystem superblock. Couldn't find valid filesystem superblock. dump2fs 1.41.9 (22-Aug-2009) dumpe2fs: No such device or address while trying to open /dev/sdc1 Unable to read contents of this file system? Because of this some operations may be unavailable. END OF ERROR MESSAGE Did I lose something during the upgrade of the system? Was it the hard drive or the Ubuntu system that went bad?

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• Windows XP , HP , IntelInside Trobelshooting

  - by Jamil Hneini

  My Windows XP PC has stopped booting. On start up, before Windows boots a screen appears saying: Windows Could Not Boot: Could Not Find or Corrupted file <Windows root>\Sytem32\Hal.dll Please Reinstall the file... From that I understand that I have to reinstall the OS but my computer is so old that I have lost the backup and recovery disk. My Computer's Info: 32Bit Computer Pentium 4 Windows XP Service Pack 2 HP History: My Computer has 4 hard drives 2 internal 40 GB drives (C And D) 2 external 8GB drives (E And F) Additional Info: I need the files inside C And E The computer reads my flash drive as a hard drive (8.45GB)(I have never booted while my USB pluged in while I was troubleshooting) With some test I discovered that the C drive wasn't detected by the computer I have already configured the boot order of BiOS I have Set The SATA to IDE The Question: I have a setup for windows 8 32 bit how can I boot from my USB to run that setup? If that isn't the proper way to handle this problem please tell me the proper way.

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• Same SCSI drive appears multiple times on the controller list

  - by ohad

  Hi, I have an Adaptec AHA-2940UW SCSI adapter, to which I connected a single Atlas 10K III drive (and nothing more). When my computer loads up, the pre-OS Adaptec screen shows (I believe this is called the POST screen), where I can see the Atlas drive listed many times (i.e. with ID0, ID1, ... ID5, ID7, ID8,...,ID15 [ID6 is the adapter itself]) Using the same HD on an Adaptec AHA-2940UB the disk only shows once Since my OS hasn't been installed yet, I'm not sure if this is a problem (I would guess it is), and if so - how to solve it. Termination and multiple LUNs come mind, but the cable provides termination and I don't see why a hard drive would request multiple LUNs, especially considering it is not jumpered at all, and multuple LUN support is disabled in the Adaptec controller BIOS (via the SCSISelect utility) Thank you

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• Best practice for scaling a single application source to multiple nodes

  - by Andrew Waters

  I have an application which needs to scale horizontally to cover web and service nodes (at the moment they're all on one) but interact with the same set of databases and source files (both application code and custom assets). Database is no problem, it's handled already with replication in MongoDB. Also, the configuration of the servers are the same (100% linux). This question is literally about sharing a filesystem between machines so that its content is always correct, regardless of the node accessing it. My two thoughts have so far been NFS and SAN - SAN being prohibitively expensive and NFS seeing some performance issues on the second node with regards to glob()ing in PHP. Does anyone have recommended strategies or other techniques that don't involved sharding data across nodes or any potential gotchas in NFS that may cause slow disk seek times? To give you an idea of the scale, the main node initialises it's application modules in ~ 0.01 seconds. The secondary is taking ~2.2 seconds. They're VM's inside a local virtual network in ESXi and ping time between them is ~0.3ms

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• Open Source Visualization and Dashboard Software

  - by helios

  I am working on an open source Application Performance Monitoring (APM) software and looking for a visualization tool with dashboard capabilities. I came across Graphite which looks pretty good but wondering if there is anything better out there before I settle down with that tool. Here's the list of features I am interested in: Must-Have Open Source license API to submit real time data Web-based visualization interface Persistence - file or database Nice-To-Have Dashboard Capabilities: Allow users to select a few metrics (CPU, Heap Usage, # of Active Users etc.) and place them on a single page for easier monitoring. Any suggestions?

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• Time Machine (archive) of pre-Leopard systems?

  - by benc

  I want to get off an older Mac OS X system permanently. It is an iBook G3, so that has two important characteristics: Power PC, not Intel based. Runs only Tiger, not Leopard. This means, as far as I can tell: Cannot run Time Machine directly. Here's the approach I have been contemplating: Mount the drive in Firewire mode. Back up the drive as a external drive to the Time Machine volume. Disconnect the drive (permanently). However, I'm concerned that this drive will eventually age out, when the Time Machine volume fills up, and the old-system-as-external-drive is gone. Would it be better to do a single backup with another utility, to shared disk?

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• Ways to remotely reboot a Linux system

  - by dualed

  I had a remote server running Debian Sarge that experienced some HDD failure and I meant to reboot it hoping that fsck could repair the errors automatically. I eventually drove out there and replaced the faulty disks... But I was wondering: What other ways are there to force a Linux system to reboot that do not require hard drive access? What I had tried: shutdown -r now Did not work, as shutdown is a program that would have to be loaded from disk, the error shown in the terminal was bash: /sbin/shutdown: Input/output error init 6 same as above telinit q same as above kill -2 1 This did not print an error, but did not work either. (However, it is possible that the Sarge init did not implement SIGINT, the sarge manpages did not mention it. So it could work in a more recent version of Debian) This guide on PCFreak.net. However, this failed at sysctl, which was not in memory either.

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• Windows CE Remote Kernel Tracker - gathering data in one (more) file during a log period of time

  - by Nic

  I'm using the "Windows CE Kernel Tracker" tool to gather data from my embedded device. This is working fine for short period of time. It seems that the tool is getting data in memory and not on disk. I'm wondering if there is a way to take the data from the device and log it in one or more file on my development computer. This could be useful for long time test period : for instance, one night or one entire day. Any ideas? p.s. I don't want to log on to the device, I want to log on my development PC.

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• 4TB HGST SATA drive only shows 1.62 TB in Windows Server 2012

  - by user136085

  I'm using a Supermicro X9SRE-3F motherboard with the latest BIOS and 2x 4TB drives connected to the on-board SATA controller. If I set the BIOS to RAID and create a RAID 1 array, the array shows up in the BIOS as 3.6TB. However when I boot Windows (on a separate RAID 1 array), the 4TB drives show up individually in disk manager as 2x 1.62TB drives. I could use Windows 2012 to set up software RAID 1, but when I set the BIOS back to 2x individual drives, they still show up in Windows as 2x 1.62TB drives. How do I access the full capacity of these drives? Thanks, Brian Bulaw

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• Getting error code -41 when copying files to external drive

  - by diego

  I'm having trouble copying some files from my mac to an external hard drive: I keep getting the nondescript "error code -41". I noticed some of the files with an additional "@" permission bit had the "com.apple.quarantine" flag set. I used the "xattr" command from this article What should I do about com.apple.quarantine? to take care of the quarantine flag and sort that out (these files were copied over from another mac on my network, so I guess OS X flagged them as quarantine). That took care of the problem for those files but I still have some that I can't manually copy over to the external drive. The only other thing I've noticed is that some of these files have a an extra permission bit: "drwxr-xr-x+" which I haven't been successful in googling. Aside from that I don't see anything else. Also, Disk Utility says everything's fine. Any help would be greatly appreciated.

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• Upgrading from MySQL Server to MariaDB

  - by Korrupzion

  I've heard that MariaDB has better performance than MySQL-Server. I'm running software that makes an intensive use of MySQL, thats why I want to try upgrading to MariaDB. Please tell me your experiences doing this conversion, and instructions or tips. Also, which files I should take care of for making a backup of MySQL-Server, so if something goes wrong with MariaDB, I could rollback to MySQL without issues? I would use this but i'm not sure if it's enough to get a full backup of MySQL-Server confs and databases mysqldump --all-databases backup /etc/mysql My Environment: uname -a (Debian Lenny) Linux charizard 2.6.26-2-amd64 #1 SMP Thu Sep 16 15:56:38 UTC 2010 x86_64 GNU/Linux MySQL Server Version: Server version 5.0.51a-24+lenny4 MySQL Client: 5.0.51a Statistics: Threads: 25 Questions: 14690861 Slow queries: 9 Opens: 21428 Flush tables: 1 Open tables: 128 Queries per second avg: 162.666 Uptime: 1 day 1 hour 5 min 13 sec Thanks! PS: Rate my english :D

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• What can I do to enhance MacBook Pro internal mic sound quality in iMovie?

  - by gaearon

  After using MacBook for two years, I bought 17'' MacBook Pro. I'm pretty happy with it, performance and all, but I also was going to record some music videos for YouTube. I play guitar and sing. However I was extremely disappointed with the sound quality that comes by default. I'm 100% sure my 13'' MacBook mic was much better at recording music and singing. Currently mic can't event handle acoustic guitar, outputting sound you'd think was recorded 5 years ago in ARM format on a Nokia phone on a loud concert. It totally feels like some lame filter is cutting low and high frequencies. I want to know what settings (visible or hidden) in iMovie or Mac OS itself I might want to tweak in order to get my MBP mic record clean sound.

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• User reduced LVM logical volume without resizing filesystem

  - by Matthew

  I received an email yesterday that one of our users was trying to make room for a heartbeat/clustering package which requires its own partition to act as a voting disk. To do this, he attempted to reduce the size of the root partition's logical volume, and then create a new logical volume for this purpose. However, he forgot to resize the filesystem first (or include the -r switch in the command). He also forgot to unmount the root partition by running this process from a rescue cd. The system is now refusing to boot into the OS with the following error: Either the superblock or the partition table is likely to be corrupt! Unexpected Inconsistency; run fsck manually. The system them drops the user into single user mode. Is it possible to rescue the filesystem, or is it hosed? Its running ext3.

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• Nexenta under KVM?

  - by Nick

  I have an Ubuntu Server running KVM. I'd like to get the benefits of ZFS so I was thinking of installing a virtual machine under KVM running Nexenta (or NexentaStor), allowing that virtual machine to have raw access to a couple of physical hard disks, and then having it share its file system with NFS so that Ubuntu can access it. I've never tried setting up KVM so that the virtual machine has access to physical drives. Does this sound feasible, and is there anything I need to watch out for? Has someone already documented something like this? Does Nexenta/ZFS function basically as well in the virtual environment as if they were running base bones? I can take a small performance hit, but I don't want it to not be as reliable because of the virtualization. Thanks.

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• CPU fan turns on and off repeatedly without booting

  - by rnso

  My PC has suddenly stopped starting up. On checking with case open, the CPU fan starts running when the power is turned on, but it stops after about 2-3 seconds, restarts again after about 2-3 seconds and the loop is repeated. There is no beep and nothing appears on the screen. On searching the internet, I found there could be several reasons for this. I tried removing hard-disk, CD drive, tightening connections etc but of no avial. I also tried using a new power supply but the response is the same. Where could be the problem and how can it be solved? Thanks in advance.

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• Advice for migrating email server

  - by Chris Adams

  Hi there, I'm planning to migrate a Zimbra server with about 200gb of data from a server hosted in an office into a datacentre, to increase uptime (we've had a couple of outages when our network here started flaking out, and we have people in other countries relying on this server too). However, I'm not sure how best to migrate the data into the data centre without rendering the connection unusable during office hours, because there's far too much to send in over night over the two meg upstream connection we have here. I'm familiar with using tools like nice to stop a long running process degrading machine performance - is there a simple way to throttle a connection between office hours, so the long running transfer doesn't block the pipe, but then opens up outside of office hours to make the most of the bandwidth? I'm aware the alternative here is to simply mail a hard drive to the data centre, but I'd like to avoid doing that if I could. We're using Centos Linux for our servers, in the office and the datacentre, so extra points for an open source linux answer.

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• How can I create a pen drive that I can boot from, and then install Win98 from?

  - by rossmcm

  I have a HP Compaq t5515 thin client computer with a flash disk and USB port. I want to put Win98 onto it, replacing whatever is on there now (I think it is some Linux-based thing). I can find stuff about putting Win98 onto a pen drive and running from that, but I can't find any info about installing Windows 98 from a pen drive onto a sep[arate system. Is it just a matter of making the pen drive bootable to DOS copying the contents of a Win98 installation CD onto the pen drive booting the HP machine from the pen drive running SETUP.EXE from the pen drive? Any pointers appreciated. TIA

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• Pygrub with DRBD on Xen 3.2

  - by Joril

  Hi all, we have a two-node cluster using DRBD 8.2 on CentOS 5.2 64bit. The cluster runs a few VMs on top of Xen 3.2.1, here's the configuration for an Ubuntu Jaunty VM: name = 'dev' bootloader = '/usr/bin/pygrub' memory = '512' vif = [ 'ip=192.168.1.217,mac=00:16:3E:CD:60:80' ] disk = [ 'phy:/dev/drbd24,xvda1,w', 'phy:/dev/drbd25,xvda2,w' ] As you can see, the disks are specified like "phy:", and as such pygrub doesn't know a thing about the underlying drbd device... So my problem is that even though the VM boots just fine, it doesn't handle the state of the drbd device. As a result, when for some reason the device gets to a secondary/secondary state, the VM won't boot, and I have to manually specify which node is primary. I read that starting with Xen 3.3 pygrub understands the "drbd:" specification, and I think that it would fix my problem, but I can't upgrade Xen at the moment... Is there a workaround? For example, could I use the 3.3 version of pygrub? Thanks!

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• Resize ntfs system partitions with GParted?

  - by ane

  Trying to resize 2 ntfs system and boot partitions (windows 2003 server) using GParted. Goal: Resize D: (/dev/sda1) to ~850G - this is the boot drive with D:\ntldr, boot.ini, etc. Resize C: (/dev/sda5) to 100G - this is the system drive with C:\windows Tried resizing /dev/sda5 first and got the chkdsk error shown in screenshot #2. (You must run chkdsk /f). Have already run chkdsk /f on C: multiple times with no bad sectors or errors found. Have also run multiple chkdsk /f's on the underlying hard disk multiple times and rebooted way more than a couple times with the same error. How do you force gparted to ignore this error and resize? I found there is --force option to ntfsresize but don't know how to get the GParted ISO live CD to use it. How do you move the unallocated space so an extra ~750G is to the right of /dev/sda1 (D:), and an extra 10G to the right of /dev/sda5 (C:)

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• Where does the temporary flash file get stored when I am viweing from Firefox

  - by Nishant

  I am watching a lecture and it seems to be adobe flash ...I wanna save this video that I am viewing . The website I am checking is http://cs75.tv/2009/fall/ . I am using Firefox . Dont know if this info helps , but .... My about:cache result is this . Memory cache device Number of entries: 212 Maximum storage size: 13312 KiB Storage in use: 8087 KiB Inactive storage: 6819 KiB List Cache Entries Disk cache device Number of entries: 3224 Maximum storage size: 500000 KiB Storage in use: 26066 KiB Cache Directory: C:\Documents and Settings\nvarm\Local Settings\Application Data\Mozilla\Firefox\Profiles\d74svniy.default\Cache List Cache Entries Offline cache device Number of entries: 0 Maximum storage size: 512000 KiB Storage in use: 0 KiB Cache Directory: C:\Documents and Settings\nvarm\Local Settings\Application Data\Mozilla\Firefox\Profiles\d74svniy.default\OfflineCache List Cache Entries

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• How to use 3T SAS HDDs which aren't supported by Dell PERC 6i

  - by Sunry

  We bought several 3T SAS hard disks want to use with our Dell R710 server. But we found our R710 can't recognize the 3T hd, and then we dig out the raid card is PERC 6i which doesn't support it. Contacted with Dell that H700 and H800 support 3T hd, thought we can buy a H700 , but the SAS cable is not available in the market right now. And it seems very hard for us to change the raid card, also no suitable tools to tease the special screws. So I want to know if any other method to use these 3T hds instead of putting them in the warehouse? Can I low formatting it to 2TB, and plug it into Dell R710 to use? Or a SAS to USB adapter to use it as USB external disk? I just want to use them by Dell R710 even external.

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• How do ulimit -n and /proc/sys/fs/file-max differ?

  - by bantic

  I notice that on a new CentOS image that I just booted up off of EC2 that the ulimit default is 1024 open files, but /proc/sys/fs/file-max is set at 761,408 and I'm wondering how these two limits work together. I'm guessing that ulimit -n is a per-user limit of number of file descriptors while /proc/sys/fs/file-max is system-wide? If that's the case, say I've logged in twice as the same user -- does each logged-in user have a 1024 limit on number of open files, or is it a limit of 1024 combined open files between each of those logged-in users? And is there much performance impact to setting your max file descriptors to a very high number, if your system isn't ever opening very many files?

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• df command show no output

  - by user119720

  I'm running the linux distro on my server.When i want to verify the size of the disk, i'm issuing this commnand to get the output. df -h But it does not produce ANY output.Strangely enough when i'm issuing other command such as fdisk -l or du -h it can show output normally. Does anyone now why is this happening?Thanks. edit: here is the output of cat /etc/fstab none /dev/pts devpts rw 0 0 and this is for mount command none on /dev/pts type devpts (rw) none on /proc/sys/fs/binfmt_misc tpe binfmt_misc (rw) edit(2): here is the output of cat /proc/mounts /dev/vzfs / vzfs rw,relatime,usrquota,grpquota 0 0 proc /proc proc rw,relatime 0 0 sysfs /sys sysfs rw,relatime 0 0 none /dev/tmpfs rw,relatime 0 0 none /dev/pts devpts rw,relatime 0 0 none /proc/sys/fs/binfmt_misc binfmt_msc rw,relatime 0 0

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• Ubuntu server: lost prompt on monitor

  - by Richard

  Hello All, I am running Ubuntu 9.04 server edition. I have a monitor plugged into the box for occasional admin tasks. I pulled out a USB disk (without unmounting) and the screen is now full with this message: Buffer I/O error on device sdc1, logical block 7778778 I can't seem to clear the screen or get a prompt back. Doesn't appear to be registering keyboard strokes. The box is still running fine (I can ssh in from elsewhere and evrything is running as normal). Any ideas on how to clear screen and get my prompt back?

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