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Articles indexed Wednesday June 20 2012

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• Lots of 408 Request Timed Out from same IPs

  - by GreatFire

  Web server: Nginx. Checking our log files, there are many log entries of connections that: take 59-61 seconds send an empty request (or at least none is logged) result in a 408 response (request timed out) do not contain any http_user_agent originate from a limited number of IPs We are monitoring average times to serve responses and this obviously inflates our statistics. Apart from that though, is this a problem? Any idea why it is occurring? Does it suggest that somebody is intentionally messing with us? What should we do?

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• Single/Mulitple LUN for vmware vm hosting

  - by Yucong Sun

  I'm building a iscsi storage system for hosting about ~500 Vmware vm running concurrently. And I have a disk array with 15 disks, I only need moderate write performance but preferably not SPOFed. so, that leaves me with RAID1 / RAID10 , I have couple choices: 1) 3x LUN 4disk RAID10 + 3 hot-swap 2) 1x LUN 14disk RAID10 + 1 hot-swap 3) 7x LUN 2disk RAID1 + 1 host-swap Which way is better? Is there a real problem running 500 vms on single LUN? and would it be better to resort to 7 LUns so each VM is better isolated with each other?

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• 3Ware 9650SE RAID-6, two degraded drives, one ECC, rebuild stuck

  - by cswingle

  This morning I came in the office to discover that two of the drives on a RAID-6, 3ware 9650SE controller were marked as degraded and it was rebuilding the array. After getting to about 4%, it got ECC errors on a third drive (this may have happened when I attempted to access the filesystem on this RAID and got I/O errors from the controller). Now I'm in this state: > /c2/u1 show Unit UnitType Status %RCmpl %V/I/M Port Stripe Size(GB) ------------------------------------------------------------------------ u1 RAID-6 REBUILDING 4%(A) - - 64K 7450.5 u1-0 DISK OK - - p5 - 931.312 u1-1 DISK OK - - p2 - 931.312 u1-2 DISK OK - - p1 - 931.312 u1-3 DISK OK - - p4 - 931.312 u1-4 DISK OK - - p11 - 931.312 u1-5 DISK DEGRADED - - p6 - 931.312 u1-6 DISK OK - - p7 - 931.312 u1-7 DISK DEGRADED - - p3 - 931.312 u1-8 DISK WARNING - - p9 - 931.312 u1-9 DISK OK - - p10 - 931.312 u1/v0 Volume - - - - - 7450.5 Examining the SMART data on the three drives in question, the two that are DEGRADED are in good shape (PASSED without any Current_Pending_Sector or Offline_Uncorrectable errors), but the drive listed as WARNING has 24 uncorrectable sectors. And, the "rebuild" has been stuck at 4% for ten hours now. So: How do I get it to start actually rebuilding? This particular controller doesn't appear to support /c2/u1 resume rebuild, and the only rebuild command that appears to be an option is one that wants to know what disk to add (/c2/u1 start rebuild disk=<p:-p...> [ignoreECC] according to the help). I have two hot spares in the server, and I'm happy to engage them, but I don't understand what it would do with that information in the current state it's in. Can I pull out the drive that is demonstrably failing (the WARNING drive), when I have two DEGRADED drives in a RAID-6? It seems to me that the best scenario would be for me to pull the WARNING drive and tell it to use one of my hot spares in the rebuild. But won't I kill the thing by pulling a "good" drive in a RAID-6 with two DEGRADED drives? Finally, I've seen reference in other posts to a bad bug in this controller that causes good drives to be marked as bad and that upgrading the firmware may help. Is flashing the firmware a risky operation given the situation? Is it likely to help or hurt wrt the rebuilding-but-stuck-at-4% RAID? Am I experiencing this bug in action? Advice outside the spiritual would be much appreciated. Thanks.

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• cset as non-root to set cpu affinity for running processes

  - by RaveTheTadpole

  I've been playing with cset to set cpu affinity for running processes. I'm recreating the built-in "shield" function manually with set and proc, to add some subsets for specific threads of my application. I have a bash script that is calling cset to create the sets, and move the correct threads to the correct sets. It works when run with sudo. Now I'd like to make this script executable by another user, who does not have sudo powers. I trust this user enough to be responsible with cset, but don't want to open up the wide powers of root. I thought that CAP_SYS_NICE -- which is needed for sched_setaffinity, which I just assume cset must use -- on the script would be sufficient, but that didn't work. I tried extending CAP_SYS_NICE to the cset program (which is a thin python wrapper for the cset python library). No dice. The output of cap_to_text on my CAP_SYS_NICE'd scripts is "=cap_ipc_lock,cap_sys_nice,cap_sys_resource+eip" (it has ipc_lock and sys_resource for other reasons; I think only sys_nice is relevant). Any ideas?

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• Public DNS redirect subdomain to Windows Server 2003 DNS

  - by user125248

  I'm a programmer by trade but often dabble in sysadmin tasks and responsibilities. I have recently been tasked with setting up a Windows Server 2003 networking environment for a small business with multiple branches. The business already has a domain name they use to host a website at www.example.com. Currently the DNS nameservers are at Zerigo and I would very much like it to remain that way (as they specialize in just providing DNS services and they do this very well). We also have a bunch of other subdomains we use to conviniently connect to the various branches that have static IPs assigned from ISPs, so we're able to connect easily to branch1.example.com. Is it possible to 'redirect' all intranet.example.com DNS requests to a Windows box? I've been doing a little reading and I see there are NS records that might be able to do this, and the Windows DNS server could then perform all of the lookups for that subdomain, say, server1.intranet.example.com or client5.intranet.example.com. This would seem better to me, than registering a new domain name for the organisation, as keeping a single domain name makes more organizational sense.

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• Thin virtual host [migrated]

  - by Adam Ryczkowski

  My work setup relies on old Windows XP. Now, when Windows XP isn't supported by new hardware, it's getting harder and harder to buy a notebook on which Windows XP can run natively with all essential hardware (wireless cards, graphics, sound etc). Since I don't expect my personal setup to turn away from Windows XP any time soon, I'm investigating the following trick: why not buy any decent hardware which Linux can fully utilize, and use it as a virtual host for a guest session with e.g. Windows XP. I like using hibernation, so I prefer this Linux to be as thin as possible, only enough to support VirtualBox, KVM or any other virtualization software. Question: Are there any "standard" ways to do this, like Linux distributions aimed specifically on being light virtualization host?

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• afp/smb transfers caps at 2 megabytes/sec, wireless N

  - by CQM

  I wanted to transfer files between two mac computers. The network is wireless-N and both computers have wireless-N modules in them. The problem is that when I transfer files between them, via file sharing (afp) the network speed caps at 2 megabytes/sec. Just downloading files from the internet I can get faster speeds, so this isn't a constriction of my wifi bandwidth, it appears to be a constriction of the protocol being used. My wifi-n is set to 130mbits, so I should see real world transfer speeds around 12-16 megabytes/sec I did this command on both computers sudo sysctl -w net.inet.tcp.delayed_ack=0 which is supposed to lower tcp overhead, but this did not affect it. How can I get the speed I am expecting?

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• Installing PHP 5.2.17 Dependencies on Centos 5

  - by user1114330

  I have followed the wget method here hoping it was my solution: Howto install php 5.2.17 on centos 6 x86_64 However I get the following error when trying to install: # rpm -ivh php-5.2.17-1.x86_64.rpm error: Failed dependencies: libaspell.so.15()(64bit) is needed by php-5.2.17-1.x86_64 libcrypto.so.6()(64bit) is needed by php-5.2.17-1.x86_64 libcurl.so.3()(64bit) is needed by php-5.2.17-1.x86_64 libpspell.so.15()(64bit) is needed by php-5.2.17-1.x86_64 libssl.so.6()(64bit) is needed by php-5.2.17-1.x86_64 php-cli = 5.2.17-1 is needed by php-5.2.17-1.x86_64 Would be awesome if someone could help. UPDATE: I have now installed an instance of CentOS 5 and am attempting to install php 5.2.17 yet again...anyone know the best way to deal with the following dependencies: libaspell.so.15()(64bit) is needed by php-5.2.17-1.x86_64 libgmp.so.3()(64bit) is needed by php-5.2.17-1.x86_64 libpspell.so.15()(64bit) is needed by php-5.2.17-1.x86_64 php-cli = 5.2.17-1 is needed by php-5.2.17-1.x86_64 php-common = 5.2.17-1 is needed by php-5.2.17-1.x86_64 Wondering what libgmp, libaspell, php-cli and php-common are and where to get the proper versions for php 5.2.17. Any help is most appreciated. Thank you!

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• Why after deleting a 110+ GB collection, my /var/lib/mongodb directory still have same size?

  - by tunnuz

  I am having some troubles with MongoDB and space usage. In particular, I once used to have a large collection of about 600 million records totaling 110+ GB on disk. Recently I decided to drop it because the data was outdated, to do so I dropped the collection through rockmongo's web interface. Accordingly, rockmongo doesn't show me the collection anymore, however my disk usage hasn't changed at all. Is there any clean operation which I am not aware of, which must be run in order to synchronize the database with database files on disk? I have tried to perform a "repair" but the system complains that there's not enough space on disk ... that's because it is all used by MongoDB.

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• IIS7 Default Document not working

  - by TooFat

  I have a website running on IIS 7 that has the default document on the Web Site Level set to only index.php. If I right click on the Web Site in IIS Manager and select Explore I see that the index.php file is there. If I just browse to the web site like http://my.site.com I get the default IIS 7 logo with "Welcome" in a bunch of diff languages. If I go to http://my.site.com/index.php it brings up the site just fine. I have stopped and started the Web Site and ran iisreset but still no luck. The Default Document Section of Web.config looks like this <defaultDocument> <files> <clear /> <add value="index.php" /> </files> </defaultDocument> What am I missing?

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• Nginx Fastcgi performance issues

  - by Barry

  I am running several fastcgi servers behind Nginx. I run 3 Nginx workers and 6 fastcgi servers as upstream backends. When I run load tests of 1 req per sec, I can clearly see that on avarage a reply is 0.1sec, but from time to time there are 3.1 sec responses. It is a suspiciously deterministic number and it happens even at very small loads from time to time. Both CPU and Memory are of no issue at all. Any idea where this delay may be comming from? Any suggestions how to debug this? Many thanks, Barry.

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• Create NTFS symbolic links from within Linux

  - by rymo

  Is there a Linux utility that can create NTFS symbolic links? That is, a link on an NTFS partition that points to another NTFS folder - one that will work within Windows 7, specifically. I wish to relocate a folder that is normally in-use while Windows is running. This machine can already dual-boot into Ubuntu, so I'd like to leverage that. EDIT: To keep this from potentially turning into "which Windows Live CD is best", I will limit this question to "Is it possible with Linux, yes or no?"

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• IIS 6 404 error calling on localhost

  - by Paleta

  I'm kinda desperate here I have a Windows 2003 Server and when I try to call http://localhost I get a 404 error I have localhost configured to c:\inetpub\wwwroot\ and whatever file I create there it always shows a 404 This is what I see on the log file 2010-07-22 14:54:06 W3SVC1 127.0.0.1 GET / - 80 - 127.0.0.1 Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.2;+SV1;+.NET+CLR+1.1.4322;+.NET+CLR+2.0.50727;+.NET+CLR+3.0.4506.2152;+.NET+CLR+3.5.30729) 404 0 3 I tried restarting IIS with no luck, the eventvwr shows no error whatsoever. Please any light will be appeciated

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• How to securely enable file sharing over PPTP on Windows 2008 Server

  - by Damage

  I have set up a Windows SBS 2003 domain (LAN) and a stand-alone Windows 2008 Server (web server) at another location (workgroup). I established PPTP VPN connection (SBS dials web server) over which users from LAN should be able to access web server. On web server I enabled TCP/IPv4 and File and Printer sharing protocol. It has a few external addresses (one of them is default) AND one local address (192.x.x.x) assigned to network adapter. Firewall allows port 445 for file sharing. There's the problem - I can not enable web server file shares to be visible to LAN users and ONLY to LAN users: From SBS I can access webserver but I cannot access webserver from LAN workstations (XP, Vista). I have had same configuration - I have just replaced old (web server) Windows 2003 server with 2008 so SBS settings are the same (static route, DNS etc.). How can I enable file sharing on web server for LAN workstations? Now I have opened File and printer sharing to the internet which is of course totaly unsecure. I tried to secure the tunnel so I moved RAS (VPN) connection (Network Center) on web server to "Private" profile and moved firewall port 445 to "Private" profile but suddenly file sharing does not work and I cannot telnet webserver on port 445. How can I secure file sharing so I do not have to open it to the internet?

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• Error installing Sony Remote Play

  - by Iszi Rory or Isznti

  I'm trying to install Remote Play software to connect my laptop to my PS3. I've found a guide with instructions which seem to be in fairly wide use (found similar walk-throughs on numerous other sites), for running the software on a non-Vaio PC. Tech-Recipies: Playstation 3 – Use Remote Play on any Windows 7 PC The setup essentially goes like this: Download Remote Play software. Download patch by NTAuthority. Install Remote Play as normal. Reboot. Extract NTAuthority patch to Remote Play program folder. Manually register patched DLLs via CLI. Run Remote Play software. Sadly, my problem is early in - Step 3. I had to use Google to find the software download, as the link from Tech-Recipies seems broken. I found the download on Sony's site here: Sony eSupport: Remote Play with PlayStation®3 After downloading and running the software, I hit "Next" at the welcome screen and "I Agree" at the EULA screen. After this, a popup informs me that Setup is checking my computer's information. Then, Setup terminates with this error: I'm running Windows 7 Ultimate x64. Is anyone familiar with this error in this software? Is there a way to work around it? Did I perhaps pick the wrong download from Sony's site?

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• Lenovo Ideapad Y480 can't reinstall windows?

  - by elegantonyx

  Alright, so here's the deal... For a while, I wanted to mess with Linux. I don't know why, but I wanted to. So, what I did was use WUBI and install Ubuntu. Because of some unknown reason (Intel Rapid Start? Half the drivers being on a Lenovo-installed SSD [separate from the main hard drive]?) it wouldn't dual boot. So, I decided to use Linux Mint instead, and install it in a partition. Since Windows 7 Home Premium won't make partitions any more if you have a certain number already, I just shrank my system drive and left empty space for the installer to claim. When I installed Mint, it worked, but left my Windows 7 installation unable to boot and eventually it corrupted. I tried to use a system repair disc I burned earlier but it didn't find the Windows installation, so I assume the partition corrupted. I used this link:http://www.pcworld.com/article/248995/how_to_install_windows_7_without_the_disc.html to try and reinstall Windows. What happened was that originally it said that the partition I was trying to reinstall from had been locked down by the OEM (Lenovo). So, I went into GParted, wiped EVERYTHING, and selected 'Construct new Boot record' or whatever that function is, and now the error is: "Setup was unable to create a new system partition or locate an existing system partition. See the setup log files for more information." Does anyone know how to see the log files? Can anyone help? This system is a month old but the warranty only covers hardware failures, and I would need to pay around USD$60 for them to fix it. Please help. Any ideas? this is my main machine... Extra information: I have at my disposal: System Repair Disc (Burned myself) Windows 7 Home Premium 64 bit SP1 installation disk (burned from the pcworld links) Gparted Live CD Linux Mint 13 live cd A system backup (from the morning before this catastrophe) made using the Windows Backup and Restore. I put it on an external drive...that should be safe for now.

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• How to disable augroup in vim?

  - by Andrew Vit

  I understand that in my vimrc I can add autocmd, and I can group them into augroup. Once they are grouped, what can I do with the group? Specifically, is there a way to disable the whole group at once? Looking at the help, I only see two options: augroup! will delete the whole group: I don't think this is right since I will want to re-enable it again. Searching for "aucmd" and "disable" brings up eventignore, but this looks like it's for specific events like CursorMoved, BufWinLeave, etc. and not the command or the group itself. How is this done?

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• Fresh XP Install: PS2 Keyboard not working

  - by RedLeader

  I reformatted a drive to NTFS (not quick) and installed Windows XP on it. Now it's trying to do the graphical portion of the setup, wanting me to click Accepts and Nexts... but I can't! The keyboard works to get to the BIOS and in the BIOS. I have reset the CMOS many times, tried fail-safe and optimized defaults, and even enabled USB Keyboard and mouse support (even though the I have no USB devices plugged in).

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• How can I route all network traffic through Sonicwall Netextender VPN Client with Ethernet internet sharing enabled on a mac?

  - by Ryan Smith

  I basically have a sonic wall firewall protecting a server which I want to SSL VPN log into with multiple computers. However, I would like to do this by having those computers (or router with computer) connected to a Mac's ethernet port (the vpn would be over wireless) through the internet sharing feature on the iMac. We use the provided Sonicwall Netextender VPN Client to connect to the firewall / server and would like to only have to use one SSL ID to cover all the computers by only having the central Mac sign in. Can anyone out there help me achieve this or tell me it isn't possible? Thank a lot.

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• Modem doesn't seem to pass internet connection to router

  - by Vian Esterhuizen

  I was supplied a Cisco DPC3825 modem by my ISP and use a Cisco E4200 as my main router. Today the Internet just stopped working, just out of the blue, I can't think of anything that would have triggered it. It's been working pretty good for the past month except for a few random blips here and there. After some trouble shooting I realized that a direct wired connection to the modem would get me Internet access but if I was wired to the router as I was before I would have no connection. Assuming it was router I connected a TP-Link WR841N but it had the exact same problem. Also, connecting to the router via Wi-Fi from multiple devices will connect me to the router but I still can't get access to the Internet. From these test, it seems that the modem just won't send Internet through to the router but is clearly connecting and able to directly connect to my PC. What I've Tried A full reset and factory reset on the E4200 A full reset on the modem (but I believe my ISP has remote access to the modem because the passwords and so on are always set back). My ISP has remotely reconfigured the modem What I Should Try What else can I try? What should I do to try to narrow down the issue? Can you figure out what the problem might be based on this information?

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• Have rTorrent to move .torrent files

  - by David Alvares

  I am running rTorrent 0.9.2 and have configured it to move completed torrents to a different folder with this configuration line: system.method.set_key = event.download.finished,move_complete,"d.set_directory=~/done/;execute=mv,-u,$d.get_base_path=,~/done/" This is working fine, but I would like it to also move the .torrent file that it creates (from a magnet link into the session directory) into this done directory with the same name as the torrent and a .torrent extension. I tried adding another cp command, but I can not seem to figure out which variable ($d.get_hash did not work) stores the torrent's hash (which is what the .torrent files are named in the session directory). Is there a way to do this with rTorrent, if so how?

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• Windows 7 install detects SSD but doesn't list it to install to

  - by Mohamed Meligy

  I'm having quite a weird problem when trying to install Windows 7 SP1 on a new Corsair Force Series 3 SSD to replace a failing HDD in my wife's laptop. When I boot to Windows install, it shows that I have no disks to install to, and tells me to find it a driver to any custom disks I may have. When I go to repair option on the first install window, and then open command prompt Window, I can see the disk using diskpart, and can partition it and format partitions, and then later access them from command prompt and copy files to them. After creating partitions, clicking the "browse" button in Windows install screen that shows no disks available to install Windows to, does show the partitions created by diskpart! So, it does detect the disk and partitions, but refuses to list them as options to install to. People on the Interwebs seem to suggest that just running diskpart "clean" solved the issue for most people, just creating an "active" "primary" partition is al most tutorials suggest. Both got me only as far as described above. The BIOS doesn't have RAID option, changing between "ATA" and "AHCI" (the only available options) didn't make any difference. Might be worth mentioning that this is on a laptop that has Sata III controller for main drive (which I connected the Sata3 SSD to), and Sata II for DVD (which I used for Windows install media). That's what googling brings at least (DELL XPS 15 L502). Any ideas? . Update: The SSD is 460 GB. I tried setting it all as one partition and creating 70-90 GB partition as well (NTFS). More importantly, Windows doesn't list the partition as one it cannot install to (which it does with disks in general when they are small for example). What happens here is different. It doesn't list anything at all. It shows empty list of drives.

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• Strange Windows DIR command behavior

  - by user1167442

  I discovered this quite by accident while looking for a file with a number in the name. When I type: dir *number* (where number represents any number from 0 to 9 and with no spaces between the asterisks and the number) at the cmd.exe command prompt, it returns various files do not appear in any to fit the search criteria. What's weird, is that depending on the directory, some numbers will work and not others. An example is, in a directory associated with a website, I type the following: dir *4* and what is returned is: Directory of C:\Ampps\www\includes\pages 04/30/2012 03:55 PM 153 inventory_list_retrieve.php 06/18/2012 11:17 AM 6,756 ix.html 06/19/2012 01:47 PM 257,501 jquery.1.7.1.js 3 File(s) 264,410 bytes 0 Dir(s) 362,280,906,752 bytes free That just doesn't make any sense to me. Any clue? The question is posed on stackOverflow because the DIR command is often combined with FOR in batch programs. The strange DIR behavior would seem to make batch programs potentially unreliable if they use the DIR command.

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• Thin virtual host

  - by Adam Ryczkowski

  My work setup relies on old Windows XP. Now, when Windows XP isn't supported by new hardware, it's getting harder and harder to buy a notebook on which Windows XP can run natively with all essential hardware (wireless cards, graphics, sound etc). Since I don't expect my personal setup to turn away from Windows XP any time soon, I'm investigating the following trick: why not buy any decent hardware which Linux can fully utilize, and use it as a virtual host for a guest session with e.g. Windows XP. I like using hibernation, so I prefer this Linux to be as thin as possible, only enough to support VirtualBox, KVM or any other virtualization software. Question: Are there any "standard" ways to do this, like Linux distributions aimed specifically on being light virtualization host?

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• HLS video segmenting complications. How to create a transport stream with ffmpeg

  - by Agzam

  I have h264 videos, and currently we're using Apple's HTTP Video Streaming tools and mediafilesegmenter to segment these files. What I need to do is to switch to alternative segmenter based on this very popular open-sourced segmenter The problem is that this segmenter does not just take any video, but takes only MPEG-TS videos. So I have to convert my h264 videos to TS first. I can do that with ffmpeg. I'm using this: ffmpeg -i encoded.mp4 -vcodec h264 -i encoded.mp4 -sameq -acodec aac -strict experimental -f mpegts output.ts But this creates fairly larger output. And the reason is that Apple's segmenter keeps the same codec - AVC and the same audio codec - AAC, whereas ffmpeg changes video format to MPEG Video. The question is: can I somehow keep the same AVC video codec and still convert video to a transport stream? So my goal is to keep the same video quality and same video codecs as Apple's medifilesegmenter does. UPD: Okay... it seems that ffmpeg CAN split videos into segments: ffmpeg -i encoded.mp4 -c copy -map 0 -vbsf h264_mp4toannexb -f segment -segment_time 10 -segment_list test.m3u8 -segment_format mpegts segment%d.ts That's still has one problem: it doesn't create http live streaming index file. (-segment_list creates a file with list of segments, but it doesn't look like HLS index). So, you still have to create index file

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