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• How do I get started with Chef?

  - by Brad Wright

  The chef documentation is pretty bad. And Google isn't helping me. Can anyone point me at a decent article or something that would help me get started? My specific issues are: How do I get a client to read my configuration? chef-solo seems like the best start (I don't want to run an OpenID server or Merb) How do I configure Apache to serve Django? I already know how to do this via regular server configuration, but I figure an example Chef recipe would be a good start;

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• =~ (equal-sign tilde) and m" ... " in .htaccess directive [closed]

  - by Lèse majesté

  I saw this bit of code on an old forum post: SSLRequire %{HTTP_HOST} =~ m"\.secure\.powweb\.com" And I was just wondering what the =~ and m" ... " meant. I've been searching online and in the Apache documentation for any mention of the equal-sign tilde operator, but I've found no mention of it. I know that some directives can take a tilde to use a regular expression, but I've never seen the m" ... " form used before. What exactly is that m" ... " for? Where else would you see this form?

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• Can someone explain RAID-0 in plain English?

  - by Edward Tanguay

  I've heard about and read about RAID throughout the years and understand it theoretically as a way to help e.g. server PCs reduce the chance of data loss, but now I am buying a new PC which I want to be as fast as possible and have learned that having two drives can considerably increase the perceived performance of your machine. In the question Recommendations for hard drive performance boost, the author says he is going to RAID-0 two 7200 RPM drives together. What does this mean in practical terms for me with Windows 7 installed, e.g. can I buy two drives, go into the device manager and "raid-0 them together"? I am not a network administrator or a hardware guy, I'm just a developer who is going to have a computer store build me a super fast machine next week. I can read the wikipedia page on RAID but it is just way too many trees and not enough forest to help me build a faster PC: RAID-0: "Striped set without parity" or "Striping". Provides improved performance and additional storage but no redundancy or fault tolerance. Because there is no redundancy, this level is not actually a Redundant Array of Inexpensive Disks, i.e. not true RAID. However, because of the similarities to RAID (especially the need for a controller to distribute data across multiple disks), simple strip sets are normally referred to as RAID 0. Any disk failure destroys the array, which has greater consequences with more disks in the array (at a minimum, catastrophic data loss is twice as severe compared to single drives without RAID). A single disk failure destroys the entire array because when data is written to a RAID 0 drive, the data is broken into fragments. The number of fragments is dictated by the number of disks in the array. The fragments are written to their respective disks simultaneously on the same sector. This allows smaller sections of the entire chunk of data to be read off the drive in parallel, increasing bandwidth. RAID 0 does not implement error checking so any error is unrecoverable. More disks in the array means higher bandwidth, but greater risk of data loss. So in plain English, how can "RAID-0" help me build a faster Windows-7 PC that I am going to order next week?

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• Trouble configuring firewall for FTP on Windows Server 2008 R2

  - by x3ro

  Ok, I'm having the exact same problem as in this question http://serverfault.com/questions/59635/outbound-ftp-on-server-2008-r2-stalls but the accepted answer didn't help me much... I followed the third step of this http://learn.iis.net/page.aspx/309/configuring-ftp-firewall-settings/ guide in order to configure my firewall for FTP, and I am able to authenticate, however, the data channel doesn't seem to be passing through the firewall. If I disable the firewall, everything works fine. Hope someone can help me, as this is really starting to annoy me. Best regards, x3ro

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• How do I objectively measure an application's load on a server

  - by Joe

  All, I'm not even sure where to begin looking for resources to answer my question, and I realize that speculation about this kind of thing is highly subjective. I need help determining what class of server I should purchase to host a MS Silverlight application with a MSSQL server back-end on a Windows Server 2008 platform. It's an interactive program, so I can't simply generate a list of URLs to test against, and run it with 1000 simultaneous users. What tools are out there to help me determine what kind of load the application will put on a server at varying levels of concurrent users? Would you all suggest separating the SQL server form the web server, to better differentiate the generated load on the different parts of the stack?

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• Configuring Notepad++ to run knitr2pdf

  - by Stat-R

  Sorry for such a basic question but since I do not have a degree in programming... I am a user of R, knitr and Notepad++. I was trying to configure Notepad++ to run pdflatex and knitr(knit2pdf). By googling I found how to do it for pdflatex but I did not find anything for sweave/knitr. The following are the good ones for pdflatex http://www2.sofi.su.se/~mbe/docs/npp_r_latex.pdf http://www.tlhiv.org/ma497/software/ I inserted cmd /c cd /d "$(CURRENT_DIRECTORY)" && pdflatex.exe -shell-escape "$(FILE_NAME)" into the runrun menu in Notepad++. I do not fully understand the command though. I will appreciate any help on this. Please direct me if you can to any resource for learning these commands. I will be grateful to get any help in configuring Notepad++ for running knitr.

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• Messages released from MailScanner quarantine are marked as DUPLICATEDELIVER in Exchange 2007

  - by kdl

  I have installed Postfix with MailScanner on CentOS 5.4 as a smarthost for Exchange 2007. When a message gets quarantined and I later release it (http://wiki.mailscanner.info/doku.php?id=documentation%3Aconfiguration%3Amta%3Apostfix%3Ahow%5Fto%3Arelease%5Fquarantined%5Fmail), it gets delivered to the Exhcange box but does not appear in a user's mailbox. Exchange message tracking log shows the message is marked as DUPLICATEDELIVER and therefore dropped. How can I work around this situation? Maybe changing a message ID somehow while at the Postfix box or some other way? Thanks.

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• MAC OSX 10.5.8 need to save rsync password with ssh-copy-id

  - by Brady

  Hello all, I'll start by saying I'm very new to MAC but comfortable in using the command line thanks to using a linux a lot. I currently have rsync setup to run between a MAC OSX 10.5.8 server to a Linux Centos 5.5 Server. This is the command I'm running on the MAC server: rsync -avhe ssh "/Path/To/Data" [email protected]:data/ As it does it prompts for a password but I need it to save the password. After looking around I need to use: ssh-keygen -t dsa save the passkey and then move it over to the Linux server using: ssh-copy-id -i .ssh/id_dsa.pub [email protected] But ssh-copy-id doesnt seem to exist on the MAC server. How do I copy this key over? I've tried searching for the answer myself but the help seems to be all over the place for this.. Any help is greatly appreciated. Scott

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• To Delete a tape from the ACSLSlibrary

  - by Senthil Kumar

  Hi Anyone there can help me out for an issue as below: There was a stuck tape in the drive and so the stuck tape was removed, but i need to logically delete the tape entry from NB, so that the same media can be inserted back for operations. Netback thinks that the tape is still in that location, hence it should be removed so that the entry is not there and NB does not recognise that the tape in that location, so the same tape can be taken in through inventory. The NB used is NB5.1 Any command to delete this entry, this is a clustered based Environment (Active/Passive), and we use a ACSLS library (Physical) as well a Switch-SN6000(Logical) Kindly help me out as when we tried to delete the media from GUI it said- Could not delete- Cannot delete assigned volume (92).

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• SQL Import to update existing records?

  - by Kenundrum

  I've got a table in a database that contains costs for items that gets updated monthly. To update these costs, we have someone export the table, do some magic in excel, and then import the table back to the database. We're running MSSQL 2005 and using the built in SQL Management Studio. The problem is that when importing back into the table, we have to delete all the records before we import or else we'll get errors. The ideal situation would be for the import to recognize the primary keys and then update the records instead of trying to create a second record with a duplicate key- halting the import. The best illustration of the behavior we're trying to get can be found at http://sqlmanager.net/en/products/mssql/dataimport/documentation/hs2180.html the update or insert example. Is something like this possible with the built in tools or do we have to get third party software to make it happen?

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• Import GraphViz graph to Microsoft Word 14

  - by rmetzger

  I have created a GraphViz dot-file to visualize a data flow. I have to write a documentation using Microsoft Word and I'd like to include the graph in the document. For some wired reason, MS Word is not able to import SVG files. Then, I generated a .eps file using dot -Teps plan.dot -o plan.eps But once imported into Word, the picture looks horrible. I also tried to convert the svg to wmf using Inkscape. It also looked horrible. Is there a clean way to generate a file using GraphViz that Word can read?

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• configuring JRun

  - by Lucien

  We are running JRun 4 and have lots of crashes. I am trying to understand where the problems are coming from and have modified the jrun.xml file to enable metrics logging. This is what I'm seeing... 01/06 15:07:27 metrics Web threads (busy/total/delayed): 2/100/0 Sessions: 0 Total Memory=70720 Free=7464 01/06 15:08:27 metrics Web threads (busy/total/delayed): 1/100/0 Sessions: 0 Total Memory=66944 Free=9199 01/06 15:09:27 metrics Web threads (busy/total/delayed): 3/100/0 Sessions: 0 Total Memory=67456 Free=9644 01/06 15:10:27 metrics Web threads (busy/total/delayed): 3/100/0 Sessions: 0 Total Memory=63360 Free=8368 The book I've been reading (Adobe Coldfusion Anthology, Apress) suggests the "busy" number is the free memory in MB. The Adobe documentation says it's "Threads currently running". Which is correct? Also, what does all this mean? If I'm reading it correctly, I have 100 total threads, and 3 busy ones. So what are the other 97 threads doing if they are neither busy nor delayed?

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• ffmpeg trimming video

  - by Dori

  I am having a problem using ffmpeg which is driving me a little mad, so I hope someone can help me out. I have a 13 MPEG-4 .mp4 video of which I am attempting to trim the first two seconds off using ffmpeg and display in an Android app. From the numerous tuts online i am excecuting the following on the command line ffmpeg -i untrimmed_video.mp4 -vcodec copy -ss 2 trimmed_video.mp4 with no luck as it outputs a video of 4-seconds length (i have no idea where its getting 4 from), if i change this to 3 i still get a 4 second video, if i set it to 10 i get unplayable output. if i move the -ss arg to ffmpeg -vcodec copy -i untrimmed_video.mp4 -ss 2 trimmed_video.mp4 i get output the same length as the input, same as if i move to the end. I have tried lots of variations as orders and nothing seems to work, is this a bug, am i doing something wrong?! please help!!!

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• Can a generic drum unit cause a Brother HL-2170w Laser B&W printer print dirty?

  - by marcamillion

  I tried a generic drum & generic toner - and it prints dirty. I also tried cleaning everything per the instructions in the documentation. Could it be a faulty drum unit? Or is it just a generic drum unit issue? I am about to buy a new drum unit, and don't want to buy generic if it will always cause this issue. Thoughts? P.S. I tried new toner cartridges (generic, but I know these work with a 'genuine drum' properly).

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• Windows XP loses drive letter for existing partition on disk

  - by Kev

  Hi, apologies if this has already been asked - I couldn't spot anything exactly the same. I'm looking for help on the fact that Windows XP has suddenly decided to stop assigning a drive letter to the second partition on my laptop's disk. I haven't added or changed hardware and I keep everything pretty clean in terms of software installed. I've partitioned the disk into a system partition on C: and a user partition on d: but lately, when booting or coming out of hibernation or sometime from stand-by, Windows will lose it's d: mapping. If I notice and remap it from MMC, everything will be perfectly happy and will keep going. Any help on this will be greatly appreciated. Cheers, Kev

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• Is /dev in linux virtual?

  - by user973917

  Today at work a client had rm -rf /dev and ended up deleting two files in /dev/shm that forced his site to no longer work. From what I learned previously /dev is not virtual, but a fellow technician had suggested to reboot the server because /dev is virtual like /proc. Sure enough I rebooted the server and the files that the client rm -rf'd were there. So, my question is; is /dev virtual? Is it the kind of virtual like /proc? Is there more documentation on this? How can I restore the /dev files without a server reboot?

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• Unable to enable InnoDB in mySQL on Ubuntu 10.04

  - by spowers

  I am trying to enable InnDB on my linux server. I have installed Ubuntu 10.04 JeOS on an ESX server. I then installed mySQL and tomcat using aptitude. However when I use SHOW ENGINES; in mySQL it does not appear that InnoDB was installed. I then tried following the directions in the documentation. http://dev.mysql.com/doc/refman/5.1/en/innodb.html However I get the following when trying to enable a plugin: ERROR 1123 (HY000): Can't initialize function 'InnoDB'; Plugin initialization function failed. I would appreciate some advice as to how to approach this problem.

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• 0xC0000005 error when open anything with sandboxie

  - by anon

  Hey, the application failed to initialize properly oxc0000005 click on ok to terminate the application Any help would be most welcome.

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• Using client certificates with wget

  - by Doc

  I cannot get wget to use the client certificates. The documentation speaks about using the --certificate flag. The use of the certificate flag is clear, I set it to use the PEM version of the client certificate. But when I connect I get the following error: HTTP request sent, awaiting response... Read error (error:14094410:SSL routines: SSL3_READ_BYTES:sslv3 alert handshake failure; error:140940E5:SSL routines:SSL3_ READ_BYTES:ssl handshake failure) in headers. Giving up. ssl handshake failure means the client did not supply a correct client cert. Still the client cert I use, works in a browser. Note: When I disable client authentication on the server, wget can connect. Note: The use of curl is suggested, but I'd like to avoid the switch.

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• Why am I not getting text into /var/log/messages?

  - by dafydd

  Good Morning, Today, I went to look at a backup RHEL5 server that doesn't usually need to get looked at very often. I found that /var/log/messages existed, but had a size of zero. Similarly, messages.1, messages.2, messages.3, and messages.4 are also all empty. /var/log/messages has its correct permissions. (755) Reboot - No help. rm -f /var/log/messages* and service syslog restart - No help. What am I missing?

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• Linux Mint does not start after renaming home directory

  - by RUBY

  I am new to linux and was just trying to rename the only directory in home from rk to rhk. I messed up the whole thing and the settings. Created some new thing named rhk which I can't remember as it got all messed up and Now I am getting nothing after Linux Mint 10(julia) boots up - no start menu, no panel, no taskbar nothing. I tried to work in the recovery mode and got some(downloaded) 216mb of something(in the repair broken packages) hoping that it might help but didn't help. Moreover whenver I have booted in it shows messages like Could not update ICEauthority file /home/rk./.ICEauthority there is a problem with the configuration server. (usr/lib/libconfig24/gconfsanitycheck2 exited with status 256) The panel encountered a problem while loading "OAFIID: GNOME_mintMenu" The panel encountered a problem while loading "OAFIID: GNOME_IndicatorApplet" Naulitis could not create the following reqiured folders: /home/rk/Desktop, /home/rk/. Naulitis Moreover Alt+F2 gives Run application or run with file and nothing seems to be working.

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• Change Command Prompt width from the Command Line

  - by Starkers

  Don't really know what more I can say really. That window captured below will simply not get any larger. Are there some settings somewhere that will allow me to resize it? See, this limited window thing has left me in a bit of a pickle. Basically I've created an application with a command line GUI (With Ruby's Curses Library), and while everything works beautifully on OSX and Ubuntu Terminals, with Command Prompt, if the Curses Windows are larger than the Command Prompt window as shown below, the whole application crashes with a 'window already closed' error. So, is there a setting that allows users to resize their Command Prompt window, something that I'll have to put in the documentation. Here's what the holy grail answer would, be though: Is there a way to do this from the command line? Could my application detect if the Command Prompt it's running on is of fixed width, and actually programatically run the command to allow the Command Prompt window to be enlarged? Or at least give the user a helpful error message?

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• Trouble setting up PATH for Java on Debian

  - by milkmansrevenge

  I am trying to get Oracle Java 7 update 3 working correctly on Debian 6. I have downloaded and set up the files in /usr/java/jre1.7.0_03. I have also set the following two lines at the end of /etc/bash.bashrc: export JAVA_HOME=/usr/java/jre1.7.0_03 export PATH=$PATH:$JAVA_HOME/bin Logging in as other users and root is fine, Java can be found: chris@mc:~$ java -version java version "1.7.0_03" Java(TM) SE Runtime Environment (build 1.7.0_03-b04) Java HotSpot(TM) 64-Bit Server VM (build 22.1-b02, mixed mode) However there are two cases where Java cannot be found as detailed below. Note that both of these worked fine when I have previously installed OpenJDK Java 6 via aptitude, but I need Oracle Java 7 for various reasons. Most importantly, I cannot run commands as another user via su, despite the PATH showing that Java should be present. The user was created with adduser chris root@mc:~# su chris -c "echo $PATH" /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/java/jre1.7.0_03/bin:/bin root@mc:~# su chris -c "java -version" bash: java: command not found root@mc:~# su chris -c "/usr/java/jre1.7.0_03/bin/java -version" java version "1.7.0_03" ... How can it be in the PATH but not be found? Update 05/04/2012: explained by Daniel, to do with it being a non-interactive shell so files such as /etc/profile and /etc/bash.bashrc are not executed. Doing a full swap to that user and running Java works: root@mc:~# su chris chris@mc:/root$ java -version java version "1.7.0_03" ... I run a script on start up which exhibits similar but slightly different problems. The script is located in /etc/init.d/start-mystuff.sh and calls a jar: #!/bin/bash # /etc/init.d/start-mystuff.sh java -jar /opt/Mars.jar I can confirm that the script runs on start up and the exit code is 127, which indicates command not found. Inserting a line to print/save the PATH shows that it is: /sbin:/usr/sbin:/bin:/usr/bin This second problem isn't as important because I can just point directly to the Java executable in the script, but I am still curious! I have tried setting the full PATH and JAVA_HOME explicitly in /etc/environment which didn't help. I have also tried setting them in /etc/profile which doesn't seem to help either. I have tried logging in and out again after setting PATH in the various locations (duh!). Anyway, long post for what will probably have a simple one line solution :( Any help with this would be greatly appreciated, I have spent far too long trying to fix it by myself. Motivation The first problem may seem obscure but in my system I have users that are not allowed SSH access yet I still want to run processes as them. I have a ton of scripts operating in this way and don't want to have to change them all.

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• Ubuntu Newbie Needs Assistance!!

  - by Steve Greene

  New Ubuntu User Needs Help!- version 9.10 does not communicate with laptop Hello folks, Several days ago, I installed Ubuntu 9.10 onto my Acer Aspire 3100 laptop, running it alongside Widows Vista as a dual-bootable system. Creation of the Ubuntu boot CD went fine, and the installation onto my hard drive was flawless. Ubuntu opens and behaves as I would expect, except for one little problem. For reasons unknown to me, Ubuntu is not communicating with my laptop's networking hardware, and I have no internet connectivity, even when sitting directly under the wireless router at the local library (literally), which puts out a wickedly-fast signal that my Windows Vista OS auto-detects and immediately connects to. Up in the right side of the Ubuntu desktop, I click on the network icon and it does not show a wireless connection at all, even though I am only a few feet from the router. At home, where I use a dialup modem, I also see no means of getting online. My modem is an HDAUDIO Soft Data Fax Modem with Smart CP,manufactured by CXT (Conexant Systems Inc., file version 4.0.13.0, and the driver version is 7.58.0.0). I desparately wish to convert to Ubuntu. I used Mac for ten years, and then Windows for ten years. Now, after 20 years, I want to live out my days as an open-source Ubuntu fanatic. I am ready to give the old status quo the boot! I am an advanced computer user, but I am not a programmer. I seek a solution that is user-friendly for normal people, something equivalent to a driver that I can easily install or activate that will allow Ubuntu to see my hardware and get me connected. Can anyone help me over this hopefully-little glitch so that I can move on in total Ubuntu bliss? My processor is a Mobile AMD Sempron Processor 3500+ at 1.80 GHz, 1.50 GB RAM, and a 32-bit Operating System. I am running Windows Vista Home Basic, Service Pack 2. My current email is [email protected] if you have a workable solution that does not require programmer status to implement. Surely this must be a simple fix that I simply am overlooking, but being the new guy on the block, I have yet to be enlightened. Thanks for your help in coming up to speed!! Steve Wanna' be Ubuntu Fanatic "If you're not living on the edge, you're taking up too much space."

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• Back / Forward mouse buttons do not work in VMWare Workstation 6.5 Guest OS

  - by Tim Lara

  I am using a Logitech G9 mouse and running VMWare Workstation 6.5.3 on Vista x64. The guest OS is Win XP, and has the most current version of VMWare Tools installed. Left / right buttons and mouse wheel scrolling work fine in the guest OS, but the back / forward buttons are apparently not recognized. I have tried installing the Logitech software inside the guest OS as well, but it still did not recognize the back / forward buttons. (I didn't really expect this to work since the guest OS doesn't actually see the mouse hardware as a Logitech G9 directly anyway.) I vaguely remember seeing something a while back about editing the virtual machine config file to specify a 5-button mouse rather than the default 3-button setup, but I can't seem to find any specifics on how to do so in the VMWare documentation. Does anyone know if such a workaround exists, or is 5-button mouse functionality just not supported?

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