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Articles indexed in February 2011

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• Domain in a hosted environment

  - by cpgascho

  We have an application we host in a third party data center for our clients. We have multiple clients running the same application on several racks of servers. Most of our clients require that our servers be SAS70 compliant. Currently each server has it's own set of users and security settings that need to be configured. We are creating scripts to do this, but what would be the risks/advantages of joining all the servers to the domain for User Management and Group policy for enforcing security settings? The rational of some is that if the DC is hacked the whole network would be compromised where as if one stand alone hosted server is hacked everything else should be safe.

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• What is this thing called?

  - by Portman

  (Original title: "WTF is this thing called?") I have a couple of networking components in my rack that take giant AC adapters ("power bricks") that don't fit neatly into my rackmount PDU. I have one "thingy" that is shown below, and I need to buy a few more. But I have no idea what I'm searching for because I don't know what the "thingy" is called. Yes, this drawing is terrible. I would ask my 4-year-old to draw it for me because she's a better artist, but she's taking a nap.

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• How does Windows handle Time? Updating RTC, etc. (Active Directory and Novell E-Directory)

  - by bshacklett

  I'm troubleshooting some time issues in my domain and before making any big changes I want to have a thorough understanding of what's going on. I've got a few lingering questions at the moment: What sources (rtc, ntp, etc.) are queried by Windows to keep time? How does this differ in a mixed Active Directory / Novell environment? What is the order that each source is queried in? How does Windows decide whether to act as an NTP client, peer or server? In what situations will Windows update the RTC, if ever?

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• Synchronize large objects to S3 efficiently

  - by emk

  I need to synchronize about 30GB of git repositories to S3. These repos may contain some very large pack files, on the rough order of 2GB. I know that S3 has recently added support for large objects, and has new APIs that allow the objects to be uploaded as several parallel chunks. Is there a good command-line tool for Linux that allows me to efficiently synchronize large objects with S3 in a fashion similar to s3sync?

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• Can't open cocoa emacs from terminal using open -a

  - by Shane

  I installed emacs on my macbook air running os x 10.6.5 from this site http://emacsformacosx.com/. I believe this is what used to be called cocoa emacs. I dragged it into my Application folder and it works fine when i run it from there. I want to be able to run it from terminal. After some googling, i tried open -a /Application/Emacs.app foo.txt (foo.txt was and existing file). I got two emacs windows - one with welcome screen and one with foo.txt loaded. I tried a few applications in the /Applications directory and they did not seem to behave like this. I had installed it using my own account (an admin account) so after doing ls -l on /Application I noticed that the owner and group were different from the other entries in this folder. I recursively changed the owner and group to root and wheel, like the others, but this did not help. The only thing that looks funny now is that there that ls -l show a @ character which has something to do with extended attributes but i don't know how to check these. Any suggestions on what to check next? Is using the open command the only to run the program? Can I simulate what it does using a shell script?

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• multiple servers porting to each other

  - by JackLeo

  hello, here is the details: theres is who "servers": VPS with ubuntu 10.10x32 and home pc, win7 on win7 apatche2.2 is running with webpage on VPS game server is running DNS forwards www subdomain to PC, and everything else to VPS (all via ip) I can not configure DNS directly, my providers do Wanted result: DNS forwards everything to VPS, VPS redirects *:80 to PC when viewing page stored in PC domain is shown normaly Questions: How to achieve that using as minimal resources as possible? Is it possible just tel my DNS provider to fix it that :80 port is in different ip? P.S. its for my friend, i do have some apatche and VDS configuration exp. More of a programmer i am. so trow everything you can ;)

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• Is it logical that file system acls would be corrupted in a way that adds permission for another user?

  - by wilbbe01

  I was having issues on a shared hosting provider with the host's web server instance not serving some files. I asked the companies support about the issue and they responded with the results of getfacl on my home directory, and added the necessary line to allow their web server to obtain the necessary permissions. All is working happily now, but I noticed a line in the getfacl that was for what appeared to be another username to which I had no relation. I asked them about this and their response was that it was likely some minor corruption and that I could remove the unwanted line with the setfacl -x option. I know I never added the user to my home directory, and I also find it weird that that could truly happen due to corruption. So now that it is fixed I'm a little bit weary of whether or not they were trying to cover up a problem they accidentally gave someone permissions to my account, or if this kind of thing can really be corrupted in that way. Especially when that user is a real user on the same server. Any thoughts? Thanks.

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• Nagios graphing solutions vs Munin/Cacti/Ganglia

  - by sumek

  I've got a nagios server setup for monitoring ~ 30 Windows servers. I want to add some trending charts. I've read that nagios graphing plugins are simple and many people use seperate, standalone charting/trending tools. What are the restrictions of the nagios graphing plugins vs standalone products like ganglia/munin/cacti? I'm interested in specific features and advantages that standalone packages offer and nagios graphing plugins don't.

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• dpkg broken while upgrading Debian Etch to Lenny

  - by artvolk

  Good day! While trying to recover a box to lenny it seems I've broken things. It upgrades libc and glib after that dpkg seems to be broken. I can run apt-get, but it gets segmentation fault from dpkg: # apt-get -f install Reading package lists... Done Building dependency tree... Done 0 upgraded, 0 newly installed, 0 to remove and 316 not upgraded. 9 not fully installed or removed. Need to get 0B of archives. After unpacking 0B of additional disk space will be used. /bin/sh: line 1: 4606 Segmentation fault /usr/sbin/dpkg-preconfigure --apt E: Sub-process /usr/bin/dpkg received a segmentation fault. I can login via SSH but even ls is not working: # ls Segmentation fault Is there anything I can do remotelly via SSH? # ldd /bin/ls linux-gate.so.1 => (0xffffe000) librt.so.1 => /lib/tls/i686/cmov/librt.so.1 (0xb7fc8000) libacl.so.1 => /lib/libacl.so.1 (0xb7fc2000) libselinux.so.1 => /lib/libselinux.so.1 (0xb7fac000) libc.so.6 => /lib/i686/cmov/libc.so.6 (0xb7e51000) libpthread.so.0 => /lib/tls/i686/cmov/libpthread.so.0 (0xb7e3f000) /lib/ld-linux.so.2 (0xb7fd8000) libattr.so.1 => /lib/libattr.so.1 (0xb7e3b000) libdl.so.2 => /lib/i686/cmov/libdl.so.2 (0xb7e37000) libsepol.so.1 => /lib/libsepol.so.1 (0xb7df6000) It seems I've temporary fixed it with: # touch /etc/ld.so.nohwcap From here: http://saintaardvarkthecarpeted.com/blog/archive/2005/08/_etc_ld_so_nohwcap.html

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• How to interpret IOZone results?

  - by homer5439

  Here are the resuts of running IOZone on an ext3 filesystem on an LVM volume residing on a SAN LUN (it was ran with 5 parallel processes). "Throughput report Y-axis is type of test X-axis is number of processes" "Record size = 4 Kbytes " "Output is in Kbytes/sec" " Initial write " 81628.55 " Rewrite " 83354.72 " Read " 115595.02 " Re-read " 119306.09 " Reverse Read " 47684.20 " Stride read " 10011.09 " Random read " 16751.27 " Mixed workload " 5659.77 " Random write " 1661.85 " Pwrite " 36030.83 Now this is all nice and dandy, but my question is: how do I know whether the values are as good as they could be or there is something to tweak (and if so, what?) The actual usage I will have for that Logical Volume is to act as virtual disk for a VM.

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• Power surge PC damage: How can I test all components of my PC without access to a second computer?

  - by Doug T.

  Ever since we had some crazy power surges last week my 64 bit Windows 7 PC has been acting strange. My USB network adapter disconnects from the wireless and can't detect the signal. I have to disable/reenable the adapter to detect it again. Also my wife has reported that the PC has rebooted a few times while I'm not sitting at it. Today I finally caught the reboot while I was using the PC. I got this blue screen of death. Stop Code 0x00000109: "Modification of system code or a critical data structure was detected." I followed the advice at the linked article and ran a memory test. I used memtest86 and its already found around 300,000 errors out of 8 gigs of ram. Now I'm worried -- what are the odds this is isolated to just my memory and not just a system wide problem? Isn't there a good chance that many other components are fried? More importantly, how can I test those other components? Are there tools similar to memtest I can use to test my motherboard/video card/power supply? If these are vender specific, is it typical for vendors to provide testing tools?

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• Failed to su after making a chroot jail

  - by arepo21

  On a 64 bit CentOS host I am using script make_chroot_jail.sh to put a user in a jail, not permitting it to see anything expect it's home at /home/jail/home/user1. I did it typing this: sudo ./make_chroot_jail.sh user1 after, when trying to connect to user1 first i was getting an error like: /bin/su: user guest does not exist i have fixed this by copying some missed libraries: sudo cp /lib64/libnss_compat.so.2 /lib64/libnss_files.so.2 /lib64/libnss_dns.so.2 /lib64/libxcrypt.so.2 /home/jail/lib64/ sudo cp -r /lib64/security/ /home/jail/lib64/ But now, when trying to connect to user1 typing su user1 and then typing it's password, i am getting this error: could not open session So the question is how to connect to user1 in this situation? P.S. Here are the permissions of some files, this might be helpful in order to provide a solution: -rwsr-xr-x 1 root root /home/jail/bin/su drwxr-xr-x 4 root root /home/jail/etc -rw-r--r-- 1 root root /home/jail/etc/pam.d/su -rw-r--r-- 1 root root /home/jail/etc/passwd -rw------- 1 root root /home/jail/etc/shadow UPDATE1 After some modifications i managed to connect to user1, but the session closes immediately! I guess this a PAM issue, however cant find a way to fix it. Here the log entry for close action from /val/log/secure: Oct 6 15:19:42 localhost su: pam_unix(su:session): session closed for user user1 What makes the session to exit immediately after launching?

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• Slow tab completion for paths in`make' arguments

  - by ajwood

  When I'm specifying an argument for make like PREFIX_PATH=/some/path/to/prefix/ I sometimes experience very slow completion for my directories (a few seconds). It's annoying when I've got several variables to specify. To get around the problem I've been typing out the variables first to get regular completion speed, then hitting home' to insertmake` that the start of my command line. What is happening and how can I fix it?

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• Windows 7 loses correct time zone upon reboot

  - by Android Eve

  I have a standard PC running Windows 7 Ultimate (64-bit). For some reason, it refuses to keep the correct time zone (the BIOS battery is OK) when restarted. Note (1): The Time zone is correct. The "Internet Time" tab also shows "this computer is set to automatically synchronize with 'time.windows.com'. When I click the 'Change settings...' button, the 'Synchronize with an Internet time server' checkbox is checked. Still, upon reboot, the time is skewed by 6 hours... and doesn't correct itself even after waiting hours for this "automatically synchronize" to occur. Note (2): The BIOS time is set to local (i.e. not UTC). When I restart Windows 7 without booting to the other OS installed in dual-boot config (Ubuntu Linux), it seems to correctly remember the time. This may explain immediate time upon reboot, but it doesn't explain why Windows 7 won't automatically 'Synchronize with an Internet time server' even after an hour. Why is this happening and how do I correct this?

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• Windows 7 fresh install blank screen

  - by Neil Barnwell

  I've just installed Win7 Ultimate to my PC. During the install it reboots a couple of times, but 2nd or 3rd reboot I see the "Starting Windows..." message, but followed by a black screen. No mouse cursor, taskbar, anything. The monitor power light is blue (indicating it has a signal) and it was displaying the setup wizard with no problems whatsoever. Has anyone else witnessed this phenomenon? Many thanks in advance. UPDATE I booted in safe mode, and got a screen saying "Setup is preparing your computer for first use". That's brilliant, although a message box has popped up over that saying: Windows cannot complete instlalation in Safe Mode. To continue installing Windows, restart the computer. So I don't really have the opportunity to do any cleverness with drivers or anything. I guess I could try getting a different version of Win7 (I'm installing from an MSDN DVD).

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• Music player for ubuntu similar to iTunes

  - by Allwar

  Hi, I really like Itunes as a music player but i can't get it to work in ubuntu so I need another one! functions i want: shuffle, low cpu usage, a friendly interface and free of bugs. (friendly interface = esay to use) why not use rythmbox, well it has bugs, the shuffle button doesn't work because it shuffles the next song after each song. So when i use it it's just a big loop over three different songs! i want the itunes look, like it shuffles once and lets you see in what order the songs will be played. //Alvar

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• Load program to one side of monitor in Windows 7

  - by elcool

  This is a question to enhance the feature on Windows 7, where you drag the screen to one side and it docks to that side of the screen. Is there a way to have it so when I load a program, it knows that I always like it docked on the right side, so it just loads on the right side? And I don't have to drag it to the right. It will be done for Internet Explorer, so, if there is no setting on the Shortcut for this, can it be programmed into the browser?

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• Have I created the recovery disk from recovery partition correctly?

  - by Tim

  I was creating recovery disk from recovery partition on my Lenovo T400 with Windows 7. 6.5 GB of the recovery partition has been occupied. But in the process, I created three DVDs. I might remember wrong, but the first two DVDs were called by the wizard as disk 1, and the third one was called disk 2. The first one has been written 0.22 GB only. Following is the content of the DVD (right click the image and select view the image in a bigger size): The second one has been written 3.97 GB as follows: The third one has been written 2.44 GB as follows: I am allowed only one time to create recovery disk. So I cannot try again. So I was wondering if I missed something? How is the creation process supposed to be like? Thanks and regards!

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• How do I replace the screen of a Dell Inspiron 1545?

  - by Ajus10

  I got a new screen for a Dell Inspiron 1545. The old screen says Dell Inspiron 1545 LP156WH1 (TL)(C1?) HD and the new one says Dell Inspiron 1545 LP156WH1 (TL)(C1?) LCD Does that make a difference? All I can get to work on the new screen is the backlight. The old screen had a crack. Now when I plug the old one in, it will not turn on at all. Could I have blown the inverter or messed up the cable?

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• starting Tomcat from Eclipse

  - by Krns

  I've just got eclipse for jee installed, and also downloaded apache 6.0.29 and added it in eclipse preferences. I followed up this tutorial, and all i got when i run it is 404 page with "The requested resource (/WebService/) is not available." description. I can't even access root folder of tomcat at localhost:8080. However, if i start tomcat through concole command, it's working fine and home page and examples are accessible. I'm a complete noob at tomcat and eclipse(been working with netbeans before), so i've got no idea what's wrong.

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• Laptop is Switching DNS Servers

  - by Steffan Harris

  Ok sometime ago I changed my ip address to a static one because I was bored and I wanted to learn more about static ips. I am running windows xp. My laptop works find on the network that i set up a static ip address, but when i go to another network, the incorrect dns servers are being used. When I enter the option to get a dns server automatically, the internet connection works but only for a short time. After that the dns servers resets to the one i entered manually on a previous network. I did this by going to Network Connection-Right Click Local Area Connection and go to properties-Select TCP/IP - then click the Properties button. At this point i am given the option to Obtain an ip address or obtain and address automatically. My question is how do I resolve this problem of the dns server reseting to the previous one.

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• Friday Fun: Snowmageddon

  - by Asian Angel

  Has it been a long week at work and your Friday is just not passing quickly enough? If you are in need of some stress relief today then get ready to battle evil mutant snowmen in Snowmageddon Latest Features How-To Geek ETC How to Integrate Dropbox with Pages, Keynote, and Numbers on iPad RGB? CMYK? Alpha? What Are Image Channels and What Do They Mean? How to Recover that Photo, Picture or File You Deleted Accidentally How To Colorize Black and White Vintage Photographs in Photoshop How To Get SSH Command-Line Access to Windows 7 Using Cygwin The How-To Geek Video Guide to Using Windows 7 Speech Recognition Stylebot Customizes Web Pages in Chrome, Now Has Downloadable Styles Blackberry, Dell, Apple, and Motorola Tablets Compared [Infographic] Encrypt Your Google Search Queries Vintage Posters Showcase the History of Tech Advertising Google Cloud Print Extension Lets You Print Doc/PDF/Txt Files from Web Sites Hack a $10 Flashlight into an Ultra-bright Premium One

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• How to Turn Your Home Ubuntu PC Into a LAMP Web Server

  - by YatriTrivedi

  Got a Linux PC you want to put to work? Maybe you’re not comfortable with the command-line only version of Ubuntu Server Edition. Here’s how to keep the standard Ubuntu desktop and add web-serving capabilities to it. Whether you’re not comfortable with a command-line only system, you’re using your Ubuntu desktop for other things, or you just need it installed for a few particular apps, you can add Apache, MySQL, and PHP to any standard desktop installation of Ubuntu very quickly and easily Latest Features How-To Geek ETC How to Integrate Dropbox with Pages, Keynote, and Numbers on iPad RGB? CMYK? Alpha? What Are Image Channels and What Do They Mean? How to Recover that Photo, Picture or File You Deleted Accidentally How To Colorize Black and White Vintage Photographs in Photoshop How To Get SSH Command-Line Access to Windows 7 Using Cygwin The How-To Geek Video Guide to Using Windows 7 Speech Recognition Stylebot Customizes Web Pages in Chrome, Now Has Downloadable Styles Blackberry, Dell, Apple, and Motorola Tablets Compared [Infographic] Encrypt Your Google Search Queries Vintage Posters Showcase the History of Tech Advertising Google Cloud Print Extension Lets You Print Doc/PDF/Txt Files from Web Sites Hack a $10 Flashlight into an Ultra-bright Premium One

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• La publicité plus efficace sur l'iAd d'Apple que sur la télévision ? Oui d'après une étude de Nielsen

  La publicité plus efficace sur l'iAd d'Apple que sur la télévision ? Oui d'après une étude de Nielsen Les annonces sur iAd (la plate-forme de publicité mobile d'Apple) seraient deux fois plus efficaces que celles diffusées sur les écrans de télévision. C'est en tout cas la conclusion d'une étude menée par le cabinet Nielsen sur une campagne publicitaire de cinq semaines pour les produits de la firme Campbell. L'étude aurait constaté que les personnes ayant vu l'annonce sur iAd étaient deux fois plus susceptibles de se rappeler le produit que celles qui l'ont vu sur un écran de télévision. En outre, cinq fois plus de personnes auraient pris contact avec la branche iAd de Camp...

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• Mozilla annonce deux nouvelles bêta pour Firefox 4 pouvant retarder davantage la sortie du navigateur, Hotmail mis en cause

  Mozilla annonce deux nouvelles bêta pour Firefox 4 Pouvant retarder davantage la sortie du navigateur, Hotmail mis en cause Mise à jour du 04/02/2011 par Idelways La fondation Mozilla vient d'annoncer deux bêta supplémentaires pour Firefox 4, déjà à sa dixième bêta depuis la semaine dernière. Cette extension du programme de texte du navigateur risque donc de retarder d'avantage la sortie de la Release Candidate sensée précéder la version définitive plus tard ce mois. Ce nième report s'explique d'après Christian Legnitto (release-manager de Firefox) par la persistance de certains bogues bloquants. Notamment...

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