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Articles indexed Tuesday March 20 2012

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• Limit maximum incoming connections to a port using iptables

  - by Harley

  I have a server that has apache listening on a number of ports. Some ports are used for configuring the server, and another is used to download large files. My problem is that when I have a large number of clients downloading files, the web interface is uncontactable. I would like to limit the number of clients connecting on the "large file" port so that apache always has available connections to configure the server. A REJECT is fine, the client trying to download the file will back off and retry later. Each client only has one connection open to the server at a time, so limiting by IP won't work. I know I could put something in front of apache to manage this, but I'd really like to do it in iptables, without adding more software.

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• What is the difference between a PDU and a power strip (both 120V, 15A)?

  - by rob

  I just chatted with an APC rep about upgrading the UPSes at our office. She recommended a single higher-capacity 6-outlet Smart-UPS to replace the four Back-UPS units we currently have. When I asked how she recommended plugging in all the current devices, she recommended using a APC's AP9567 PDU, but said not to use a power strip. At first she said I had to use an APC brand PDU, but after I inquired about using a Tripp-Lite PDU, she said any brand PDU would be fine. The APC PDU previously referenced looks like a standard 120V power strip with overload protection but no surge protection. Other than overload protection (which seems redundant if plugging into the UPS), is there something else I'm missing, or should any power strip (without surge protection) be fine? Edit: I didn't mention it earlier, but we don't have a proper rack--though I did still plan to mount the PDU or power strip to something. I guess I'm wondering if there's any special reason I should pay as much as $180 for the low-end APC PDU (which just looks like a power strip to me) vs. $20-$30 for a workbench power strip.

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• sar command to generate only CPU utilization and network statistics in Linux

  - by Vijay Shankar Kalyanaraman

  I want to be able to generate the system activity report every 30 seconds or every minute and store in a file and use it for diagnostic purposes on my VM. So I give an output file for the sar command and read it using the "-f" option. But I only use the CPU utilization and network utilization part of the report and so rest is all that I don't want to save (waste the space in the disk to store these reports). Also the sar files that are generated are all binary. Is there a way to collect these stats for the CPU and network utilization alone? and so save almost 2/3rds the space on the disk?

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• Error "fileid changed" when accessing files over NFS

  - by Roman Prikhodchenko

  I have an nfs-kernel-server configured and running on Ubuntu 10.04 Server. /export THIRD_SERVER_IP(rw,fsid=0,insecure,no_subtree_check,async) SECOND_SERVER_IP(rw,fsid=0,insecure,no_subtree_check,async) /export/ebs THIRD_SERVER_IP(rw,fsid=0,insecure,no_subtree_check,async) SECOND_SERVER_IP(rw,nohide,insecure,no_subtree_check,async) I mounted the exported folder to the second server: mount -t nfs4 -o proto=tcp,port=2049 NFS_SERVER_IP_HERE:/ebs /ebs and it works just fine. I mounted it to the third server but I cannot access files from it. ls -l /ebs ls: reading directory /ebs: Stale NFS file handle total 0 The syslog on the third server says: kernel: [11575.483720] NFS: server NFS_SERVER_IP_HERE error: fileid changed kernel: [11575.483722] fsid 0:14: expected fileid 0x2, got 0x6e001 Some info: uname -r 2.6.32-312-ec2 uname -m i686

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• reiserfsck --rebuild-tree failed: Not enough allocable blocks

  - by mojo

  I have a reiserfs volume that required a --rebuild-tree, but is currently failing to complete when I pass it --rebuild-tree. Here is the output that I receive when running it: reiserfsck 3.6.19 (2003 www.namesys.com) # reiserfsck --rebuild-tree started at Mon Oct 26 13:22:16 2009 # Pass 0: # Pass 0 The whole partition (7864320 blocks) is to be scanned Skipping 8450 blocks (super block, journal, bitmaps) 7855870 blocks will be read 0%....20%....40%....60%....80%....100% left 0, 9408 /sec 287884 directory entries were hashed with "r5" hash. "r5" hash is selected Flushing..finished Read blocks (but not data blocks) 7855870 Leaves among those 6105606 Objectids found 287892 Pass 1 (will try to insert 6105606 leaves): # Pass 1 Looking for allocable blocks .. finished 0%....20%....40%....60%....80%....Not enough allocable blocks, checking bitmap...there are 1 allocable blocks, btw out of disk space Aborted I can't mount it, and I can't fsck it. I've tried extending the volume, but that hasn't helped either.

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• RAID setup for maximizing data retention and read speed

  - by cat pants

  My goals are simple: maximize data retention safety, and maximize read speeds. My first instinct is to do a a three drive software RAID 1. I have only used fakeraid RAID 1 in the past and it was terrible (would have led to data loss actually if it weren't for backups) Would you say software raid 1 or a cheap actual hardware raid card? OS will be linux. Could I start with a two drive raid 1 and add a third drive on the fly? Can I hot swap? Can I pull one of the drives and throw it into a new machine and be able to read all the data? I do not want a situation where I have a raid card fail and have to try and find the same chipset in order to read my data (which i am assuming can happen) Please clarify any points on which it sounds like I have no idea what I am talking about, as I am admittedly inexperienced here. (My hardest lesson was fakeraid lol) Thanks!

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• Two SSL certs for a domain in DirectAdmin

  - by Bart van Heukelom

  If I were to get 2 SSL certificates, one for example.com and one for www.example.com, is there a way to install them both on the site example.com in DirectAdmin? The default interface only allows installing one for both versions. If not, can I separate the 2 domains into 2 sites? One of them would only be a redirection, so there wouldn't be any duplication of site files. (Please don't answer with "one certificate should work for both". It doesn't always. This is a DirectAdmin question)

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• ADFS 2.0 and CRM 2011 IFD - Error 403 when being redirected

  - by JohnThePro

  I'm not sure what happened here, but let me give you the rundown. I have a CRM 2011 IFD that by all accounts was functioning. Out of nowhere, I find that when being redirected to ADFS 2.0 login page by CRM, instead of seeing the login page, I get the following error: 403 - Forbidden: Access is denied. You do not have permission to view this directory or page using the credentials that you supplied. I'm not sure what is going on here. The certs are good, as best as I can tell, the logins are good. More specifically, nothing has been modified. This all worked just fine, and now it doesn't. I'm really stumped.

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• configure Heartbeat on Centos Linux - error message

  - by Elad Dotan

  I installed Heartbeat on my Centos Linux and it seems to partially work..but I'm trying to monitor a service with no success. only when I reboot the main server the backup server takes over. in the logs I get : heartbeat[30476]: 2012/03/20_18:51:57 WARN: string2msg_ll: node [node1] failed authentication heartbeat[30476]: 2012/03/20_18:51:58 WARN: string2msg_ll: node [node02] failed authentication the authkeys is identical (copied from one to another). this is my ha.cf: logfile /var/log/ha-log logfacility local0 keepalive 2 deadtime 30 initdead 120 bcast eth0 udpport 694 auto_failback on node server01.com node server02.com haresources : server01.com 38.108.117.3 aim chat any idea how to fix the problem so if a service stops the other server take over Thanks! E.

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• 'Future-proof' Live Audio Capture & Broadcast [migrated]

  - by maxpowers

  I'm looking to implement some live audio broadcasting functionality within a Ruby on Rails site for a client and was hoping I could get some input from people who have tackled this type of thing before. Essentially what I need to do is capture and record a user's audio (via microhpone, line in, etc), then stream that to 1,000+ listeners with very little latency, like sub 2 second if possible. So it looks like we've got 3 parts: Web-based audio capture (likely with Flash or JS) Server to accept audio feed and stream to listeners (likely Icecast or Wowza) Actual audio player (maybe HTML5 w/ Flash as a fallback? Maybe this jPlayer fork) Does RTMP makes sense here? Or maybe HTTP? What's the most 'future-proof' way to make this happen? Building with mobile in mind, but still want to be able stream to anyone. I've found lots of potentially helpful threads and software but I'm struggling to get an idea of how it all fits together. I'm a front end guy and way out of my comfort zone so if anyone has insights to offer, I'd love to hear them.

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• Deleting files using .NET that were migrated from win2k3

  - by Andrew Duncan

  We recently migrated an ASP.NET website from Windows 2003 to Windows 2008 R2, by zipping up all the files and extracting them to the new site. Since migrating the web application is still able to upload and delete files (that are new), however, it's unable to delete files that were copied from the original Win 2k3 app. We're guessing it's a permissions problem because the error is: Access to the path 'E:.......PATH.....' is denied. We've been trying to match the permissions of a newly uploaded file to that of a migrated files. Newly uploaded files seem to get the APP POOL user as a permission and the OWNER. However, the original files didn't have this. Any help that anyone can be would be fantastic. Thanks,

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• Unable to install Visual Studio 2005 on Windows 7

  - by lopez

  After downloading Visual Studio 2005 SP1 and Visual Studio 2005 Upgrade for Vista to install Visual Studio 2005 on Windows 7, when I tried to intall Visual Studio 2005 SP1, I got this error message: The up patch cannot be installed by the windows installer service because the program to be upgraded is missing, or the upgrade patch may update a different version of program. Verify that the program to be updated exist on your computer and you have correct upgrade patch I have saved VS80sp1-KB926601-X86-ENU (1) and VS80sp1-KB932232-X86-ENU on the D: drive. What should I do to install Visual Studio 2005 on Windows 7?

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• Error when installing wubi on windows 7

  - by P'sao

  Im installing ubuntu on windows 7(wubi 11.10): when its nearly done it gives me this error in the log file: Usage: /cygdrive/c/Users/Psao/AppData/Local/Temp/pyl10D2.tmp/bin/resize2fs.exe -f C:/ubuntu/disks/root.disk 17744M [-d debug_flags] [-f] [-F] [-p] device [new_size] Traceback (most recent call last): File "\lib\wubi\backends\common\tasklist.py", line 197, in __call__ File "\lib\wubi\backends\win32\backend.py", line 461, in expand_diskimage File "\lib\wubi\backends\common\utils.py", line 66, in run_command Exception: Error executing command >>command=C:\Users\P'sao\AppData\Local\Temp\pyl10D2.tmp\bin\resize2fs.exe -f C:\ubuntu\disks\root.disk 17744M >>retval=1 >>stderr= >>stdout=resize2fs 1.40.6 (09-Feb-2008) Usage: /cygdrive/c/Users/Psao/AppData/Local/Temp/pyl10D2.tmp/bin/resize2fs.exe -f C:/ubuntu/disks/root.disk 17744M [-d debug_flags] [-f] [-F] [-p] device [new_size] 10-25 20:31 DEBUG TaskList: # Cancelling tasklist 10-25 20:31 DEBUG TaskList: # Finished tasklist 10-25 20:31 ERROR root: Error executing command >>command=C:\Users\P'sao\AppData\Local\Temp\pyl10D2.tmp\bin\resize2fs.exe -f C:\ubuntu\disks\root.disk 17744M >>retval=1 >>stderr= >>stdout=resize2fs 1.40.6 (09-Feb-2008) Usage: /cygdrive/c/Users/Psao/AppData/Local/Temp/pyl10D2.tmp/bin/resize2fs.exe -f C:/ubuntu/disks/root.disk 17744M [-d debug_flags] [-f] [-F] [-p] device [new_size] Traceback (most recent call last): File "\lib\wubi\application.py", line 58, in run File "\lib\wubi\application.py", line 132, in select_task File "\lib\wubi\application.py", line 158, in run_installer File "\lib\wubi\backends\common\tasklist.py", line 197, in __call__ File "\lib\wubi\backends\win32\backend.py", line 461, in expand_diskimage File "\lib\wubi\backends\common\utils.py", line 66, in run_command Exception: Error executing command >>command=C:\Users\P'sao\AppData\Local\Temp\pyl10D2.tmp\bin\resize2fs.exe -f C:\ubuntu\disks\root.disk 17744M >>retval=1 >>stderr= >>stdout=resize2fs 1.40.6 (09-Feb-2008) Usage: /cygdrive/c/Users/Psao/AppData/Local/Temp/pyl10D2.tmp/bin/resize2fs.exe -f C:/ubuntu/disks/root.disk 17744M [-d debug_flags] [-f] [-F] [-p] device [new_size] can some one help me?

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• Host file in browser?

  - by acidzombie24

  Instead of changing my host file i'd like firefox to think my domain is on my own server while my other browser to use the real ip address. I use to edit my host files but that forces both browsers to change the ip address. I found change hostbut it doesnt appear to use the alternative host file. I also saw a comment asking when it will work on firefox 6+ I tried Host Admin and it fails. It works but the alternative IP address must be in your host file already (which i dont want) and it lets you deselect a domain so the host file is ignored. Not what i want.

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• Outlook 2010 Folder Structure Search

  - by SaUce

  I work at a helpdesk and today I received a call from a user who lost a folder in Outlook. When I connected to the user's PC, I discovered that the user has several hundreds of folders. She had the same name folder in several different locations. When we used Advanced Find we found the messages. It said that messages are located in folder X. The only problem was, we could not locate the folder X in the list. Does anyone know of any way to quickly and easily browse all the folders or look up a folder in Outlook 2010?

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• Kill program after it outputs a given line, from a shell script

  - by Paul

  Background: I am writing a test script for a piece of computational biology software. The software I am testing can take days or even weeks to run, so it has a recover functionality built in, in the case of system crashes or power failures. I am trying to figure out how to test the recovery system. Specifically, I can't figure out a way to "crash" the program in a controlled manner. I was thinking of somehow timing a SIGKILL instruction to run after some amount of time. This is probably not ideal, as the test case isn't guaranteed to run the same speed every time (it runs in a shared environment), so comparing the logs to desired output would be difficult. This software DOES print a line for each section of analysis it completes. Question: I was wondering if there was a good/elegant way (in a shell script) to capture output from a program and then kill the program when a given line/# of lines is output by the program?

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• How do I access an Ubuntu VirtualBox guest at a static IP from an OS X host?

  - by David Siegel

  How does one configure an Ubuntu guest to use a static IP that's visible to an OS X host, and ensure that the static IP is independent of the host's network configuration? I previously used bridged networking for my guest, but I'm constantly moving my host between networks so the guest IP is always different. First, I tried setting the guest network configuration to NAT and forwarding host port 1022 to guest port 22, so I could at least ssh to a fixed address (localhost:1022): $ VBoxManage setextradata "Ubuntu Server" "VBoxInternal/Devices/e1000/0/LUN#0/Config/SSH/Protocol" "TCP" $ VBoxManage setextradata "Ubuntu Server" "VBoxInternal/Devices/e1000/0/LUN#0/Config/SSH/GuestPort" 22 $ VBoxManage setextradata "Ubuntu Server" "VBoxInternal/Devices/e1000/0/LUN#0/Config/SSH/HostPort" 1022 Then, $ ssh localhost -p 1022 ssh: connect to host localhost port 1022: Connection refused But this didn't work (guest has no network access with NAT and OS X refused the connection, as you can see). I'd love a general solution that would let me communicate with my guest at a fixed IP.

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• Install VPN client issue

  - by Andrey

  I'm trying to install the Shrew VPN client. In the process of installation an error occurs: Error 0x800f0203: Couldn't install the network component. It occurs when the installer tries to execute C:\Program Files\ShrewSoft\VPN Client\netcfg.exe -add service vflt C:\Program Files\ShrewSoft\VPN Client\drivers\vfilter.inf Antivirus, firewall, etc are disabled and I'm running as an administrator. I've installed vfilter.inf manually, but it leads nowhere. I have a similar situation with the Cisco VPN client. I need a VPN client supports group authorization, and imports the settings from pcf format. Windows Vista 32-bit, Shrew client 2.1.5, also try 2.0.0 for 32-bit.

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• Trying to get to the command prompt through recovery disk

  - by cody

  I'm trying to reach the command prompt through a vista recovery disk I have, and it boots from the disk and gets to the point where it asks which installation I want to repair and then says the disk is not compatible with my version of windows. I have a dual boot setup with Vista and server 2008 R2. Is there another was to run check disk? I can't boot in safemode or normally, I suspect a driver (atipcie) is the problem

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• Status: 0xc00000e9

  - by Ryan Galloza

  When I start up windows normally it just freezes , I click "Launch Startup Repair" I get this: "Windows has encountered a problem communicating with a device connected to your computer. This error can be caused by unplugging a removable storage device such as an external USB drive while the device is in use, or by faulty hardware such as a hard drive or CD-ROM drive that is failing. Make sure any removable is properly connected and then restart your computer If you continue to receive this error message, contact the hardware manufacturer" How do I fix this problem?

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• Imaging Dell OEM Windows 7 install onto other Dell laptops purchased

  - by lolkjmz

  We have ordered 70 dell laptops directly from dell. We are wondering if we can take the existing OEM install of windows on one of the laptops, add some files and then deploy that image to the rest of the laptops. We are trying to avoid making an image from the ground up. I would imagine since we have purchased 70 laptops that the same install would work on all 70 - I am not sure though. I have imaged three laptops with this image and attached them all onto the domain with no problems. They are also all activated. Updates ran fine as well. We are using this to duplicate drives http://www.startech.com/HDD/Duplicators/4-Bay-USB-3-0-eSATA-to-SATA-Standalone-1-3-HDD-Hard-Drive-Duplicator-Dock~SATDOCK4U3RE Will this method work or is there potential for problems in the future?

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• In an environment with multiple WiFi access points, do wireless clients sometimes connect to both at the same time?

  - by Bobby Burgess

  This is more of a curiosity than a problem, but in this new office I have two D-link DAP-2553's connected in a master/slave array (this just means the master keeps certain configuration options aligned with the slave). The network is set to 802.11n-only, and each AP has the same SSID and WPA2 key. The only difference is that they are on different channels (1 and 11). The WiFi network itself is working well. Users can roam around and the signal/speed is fairly consistent. However, I notice that when I look at the 802.11 client list in the web admin page for each of the 2 APs, I see that certain clients are connected to both, for extended periods of time, but I assume they are only passing data through one of them. Not every client is seen on each AP, but at any given time the same MAC address of a WiFi adapter can be associated (and remain associated) with both APs. The client list auto-refreshes every few seconds so I believe I'm looking at the most recent rather than stale information. One of the WiFi adapters that consistently associates with both APs is an Intel Centrino Wireless-N 1030 (laptop chip). Is it part of the WiFi standard that more than one association per WiFi card can be established concurrently on separate APS?

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• How are benchmarks for multiple cores calculated?

  - by B Seven

  I found this site to compare CPU's. http://www.cpubenchmark.net/high_end_cpus.html What wasn't clear is how the benchmark for multiple core processors is calculated. If one CPU has 4 cores (such as Intel Core i7 which comes in 2, 4, and 6 core versions: http://en.wikipedia.org/wiki/Intel_Core_i7#Core_i7), does that mean that the benchmark should be double that of the version that has 2 cores (assuming the same clock frequency)?

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• Boot stuck at blinking cursor before GRUB - only works via BIOS boot menu

  - by delta1

  I have a new box running Debian Squeeze. Grub is installed on /dev/sda, but when booting up I just get a blinking cursor, before the Grub menu. I can only boot to grub successfully when I choose boot options (during post) and select that specific drive! I have made sure the correct drive is set to boot first in the BIOS. So Grub works, but the system won't boot to that drive automatically? Any ideas on what could cause this? Drives sda/b/c are all 2TB (sda runs the system with b/c as raid device md0) with the following partitions: $ cat /proc/partitions major minor #blocks name 8 0 1953514584 sda 8 1 977 sda1 8 2 9765625 sda2 8 3 6445313 sda3 8 4 1937302627 sda4 8 32 1953514584 sdc 8 16 1953514584 sdb 9 0 1953513424 md0 but # fdisk -l /dev/sda gives WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/sda: 2000.4 GB, 2000398934016 bytes 255 heads, 63 sectors/track, 243201 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/sda1 1 243202 1953514583+ ee GPT Any insight into this strange behaviour would be greatly appreciated.

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• Cannot connect to FTP server from external host

  - by h3.

  I have a FTP server (vsftpd) setuped on a Linux box (Ubuntu server). When I try to connect with a computer on the same network everything works fine as expected. But as soon the IP is external it won't connect.. I first assumed the port was blocked, but then: localserver:$ sudo tail -f /var/log/vsftpd.log Wed Jan 13 14:21:17 2010 [pid 2407] CONNECT: Client "xxx.xxx.107.4" remotemachine:$ netcat svn-motion.no-ip.biz 21 220 FTP Server And it hangs there. Do any ports other than 21 need to be open?

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