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• How to disable auto insert notification in Windows 7?

  - by White Phoenix

  Alright, here's the problem. My hard drive activity light on my custom built PC is blinking exactly once every second. Microsoft has this to say on the issue: http://support.microsoft.com/kb/138598 There has been discussion on this issue several months ago: Why does my hard drive LED light blink every second? The problem seems to stem from primarily Windows 7 polling the CD-ROM/DVD drive every second to see if something is inserted. The Windows 7 users in the thread that was linked in the superuser question, https://social.technet.microsoft.com/Forums/fi-FI/w7itprohardware/thread/4f6f63b3-4b58-4154-9298-1566100f9d00, have confirmed that this IS a known issue with Windows 7. Some people point at the motherboard circuitry causing the CD-ROM and SATA activity to both be linked to that hard drive activity, but whatever the case, the temporary solution seems to be to disable the CD/DVD-ROM drive in Device Manager. In fact, disabling the CD/DVD-ROM does stop the blinking, but of course this solution is counterproductive, because I shouldn't have to entirely disable a device to fix this problem. I've done the following suggestions in that thread: Change the autorun registry entry to 0 Completely disable autoplay in the autoplay control panel Disable autoplay in the Local Group Policy Editor. None of these stop the blinking from happening - apparently these solutions work for both XP and Vista, but it seems to be different in Windows 7. So I'm wondering if anyone has found out how to completely disable the polling in Windows 7, or if this will just have to be an issue we will have to deal with. There's no option to disable the auto insert notification when you go to the device within device manager (there was in XP), so I got no idea where this option is hidden, or if there's a registry key entry I could change to stop the polling. Anyone have any idea?

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• nginx rewrite or internal redirection cycle

  - by gyre

  Im banging my head against a table trying to figure out what is causing redirection cycle in my nginx configuration when trying to access URL which does not exist Configuration goes as follows: server { listen 127.0.0.1:8080; server_name .somedomain.com; root /var/www/somedomain.com; access_log /var/log/nginx/somedomain.com-access.nginx.log; error_log /var/log/nginx/somedomain.com-error.nginx.log debug; location ~* \.php.$ { # Proxy all requests with an URI ending with .php* # (includes PHP, PHP3, PHP4, PHP5...) include /etc/nginx/fastcgi.conf; } # all other files location / { root /var/www/somedomain.com; try_files $uri $uri/ ; } error_page 404 /errors/404.html; location /errors/ { alias /var/www/errors/; } #this loads custom logging configuration which disables favicon error logging include /etc/nginx/drop.conf; } this domain is a simple STATIC HTML site just for some testing purposes. I'd expect that the error_page directive would kick in in response to PHP-FPM not being able to find given files as I have fastcgi_intercept_errors on; in http block and nave error_page set up, but I'm guessing the request fails even before that somewhere on internal redirects. Any help would be much appreciated.

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• USB device goes to "Unknown device" randomly

  - by ILovePaperTowels

  We have a kiosk that uses a bio scanner from m2sys (usb device). It scans your palm to recognize you. Every so often, maybe 1-3 times a day, the bio scanner will become an unknown device. We are unable to see any patterns or commonalities. When we unplug and plug it back in, it becomes available again. We have custom software that uses the bio scanner's software to communicate with it. We've added a crap load of logging on everything but there doesn't seem to be any pattern of when the thing shuts off. We have these devices deployed to multiple locations (100+) and they are all seeing the issues but we can not reproduce it here, at the main office. I've evaluated the software and I don't see anything. I'm thinking it's a driver or hardware issue (but we can't reproduce the issues here in the main office) or maybe environmental interference of some sort like from scan guns, automatic doors, microwaves or something else. Any ideas would be welcome. I'm looking for possible causes of the usb device becoming unknown or ways to figure out what the cause is. no other usb devices have this issue, only the scanner We've contacted the manufacturer and they blame our software We're getting help from Microsoft, but they haven't found anything OS is embedded XP http://www.m2sys.com/palm-vein-reader.htm

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• Ubuntu 12.04 froze during update, won't boot

  - by Cichol

  I've recently installed Ubuntu 12.04 on my laptop, and every time i tried to update it, it would freeze for a few seconds, and tell me that the updates could not be downloaded. After many, many tries I managed to get them downloaded, but then in the middle of installing them, it froze. Completely. No mouse movement, no blinking lights, no nothing. After a few hours of letting it sit there, I finally hit the power button to do a hard reset, and now when I select Ubuntu on the boot screen (Dual-boot with Windows 7), I get a blank purple screen, and then nothing. Another freeze. I've tried getting into the console, but no command I input has any visible effect. I have a ton of music stored on the partition it's in, so I'd really rather not have to reinstall. My specs, to the best of my knowledge: Clevo Corp model B7130 (Sager custom) CPU: Intel Core i5 @ 2.53gHz (4 CPUs) Graphics Card: Nvidia GeForce 425m 4096 MB RAM Drivers: Whatever comes with the download of 12.04. As a side-note, I installed Ubuntu via the Windows Installer program (wubi). Does that make a difference?

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• Server Bash Line Wrapping Over Text & In Wrong Place

  - by Pez Cuckow

  This is quite a hard problem to explain, when connecting to one of my servers using the bash shell, under any user the line wrapping is broken and has all sorts of problems. Once of which I detail in screenshots below: Other problems I experience include nano getting very confused about which line and or letter I am on, as shown by typing the same message into nano: These problems only occur when connecting as I previously mentioned to one of my servers which runs CentOs. Do you know why this is occurring and what I can do to fix it? On other servers the message works fine! Thanks for your time, Output of requested commands: Server that doesn't work properly: Working server: Could it perhaps be the custom prompt on the non working server? In .bashrc PS1='\e[1;32m\u@\h\e[m:\e[1;34m\w\e[m$ ' Commenting this out appeared to resolve the problem. Google says line wrapping errors can occur if you don't conform to these rules use the \[ escape to begin a sequence of non-printing characters, and the \] escape to signal the end of such a sequence I am not sure where this would fit in on my prompt?

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• Does fast typing influence fast programming?

  - by Lukasz Lew

  Many young programmers think that their bottleneck is typing speed. After some experience one realizes that it is not the case, you have to think much more than type. At some point my room-mate forced me to turn of the light (he sleeps during the night). I had to learn to touch type and I experienced an actual improvement in programming skill. The most surprising was that the improvement not due to sheer typing speed, but to a change in mindset. I'm less afraid now to try new things and refactor them later if they work well. It's like having a new tool in the bag. Have anyone of you had similar experience? Now I trained a touch typing a little with KTouch. I find auto-generate lessons the best. I can use this program to create new lessons out of text files but it's only verbatim training, not auto-generated based on a language model. Do you know any touch typing program that allows creation of custom, but randomized lessons?

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• Import exponetial fixed width format data into Excel

  - by Tom Daniel

  I've received a bunch of text data files consiting of Lots of records (30K/file) of 3 fields each of 5-place numbers in exponential format: s0.nnnnnEsee (where s is +/-, n is a digit and ee is the exponent (always 2 digit). When I open the file in Notepad, the format is perfectly uniform throughout each file, but when I import it to Excel using Data|Import|Fixed Width, many of the data values get messed up, no matter what format (text, exponential, various custom tries) I assign to the cells. Looking at the Notepad version, it appears that leading + signs were replaced with a space in the data file, but the sign of the exponential is always there. This means that some fields begin with a space, and this appears to confuse the Excel import routine. I get the same result in Excel 2003 and 2007. I'm sure there's a straightforward solution (hopefully without a messy VBA routine), but I can't figure out what to try next. :-) To clarify (hopefully), here are some input records and the corresponding text input to Excel: Notepad Excel -0.11311E+01 0.10431E-04 0.27018E-03 -0.11311E 1.0431E-05 2.7018E-04 0.19608E+00-0.81414E-02-0.89553E-02 0.19608E -8.1414E-03 8.9553E-03 etc. Whoopee! Solved my own problem - in the spirit of Jeopardy, now that I've begun the question, here's the answer - Use a different "File Origin" - several other than the default "Unicode UTF..." work fine! What a pain. Hope this helps somebody else avoid a few unpleasant hours! Aloha from Kona, Tom

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• EC2: How dangerous is it to turn off fsck for EBS volumes?

  - by Janine

  I have been tearing my hair out trying to figure out why my EC2 instances (made from my own custom AMIs) were taking many tries to come up properly. They would fail with the following error: fsck.ext3: No such file or directory while trying to open /dev/sdf For both of the EBS volumes I was attaching during startup. Finally, I figured out the problem. I had put this in /etc/fstab: /dev/sdf /export ext3 defaults 1 2 /dev/sdi /export2 ext3 defaults 1 2 The 2 tells the system to fsck the drives on the way up. Changing this to /dev/sdf /export ext3 defaults 1 0 /dev/sdi /export2 ext3 defaults 1 0 Avoids the problem completely, but now the volumes are never going to be fsck'd. How much does this matter? Once the instance goes into production it's going to be running pretty much 24/7, so not many fscks would be happening anyway, but still... this just feels like a bad idea. I have not been able to find anyone else even reporting this problem (there are people with the same error message, but different causes). It seems unbelievable that I could be the only person to ever make this mistake, but perhaps I'm just talented that way. :) If there is another solution to the problem I would love to hear it; I have not been able to find one.

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• Kerberos & localhost

  - by Alex Leach

  I've got a Kerberos v5 server set up on a Linux machine, and it's working very well when connecting to other hosts (using samba, ldap or ssh), for which there are principals in my kerberos database. Can I use kerberos to authenticate against localhost though? And if I can, are there reasons why I shouldn't? I haven't made a kerberos principal for localhost. I don't think I should; instead I think the principal should resolve to the machine's full hostname. Is that possible? I'd ideally like a way to configure this on just one server (whether kerberos, DNS, or ssh), but if each machine needs some custom configuration, that'd work too. e.g $ ssh -v localhost ... debug1: Unspecified GSS failure. Minor code may provide more information Server host/[email protected] not found in Kerberos database ... EDIT: So I had a bad /etc/hosts file. If I remember correctly, the original version I got with Ubuntu had two 127.0. IP addresses, something like:- 127.0.0.1 localhost 127.0.*1*.1 hostname For no good reason, I'd changed mine a long time ago to: 127.0.0.1 localhost 127.0.*0*.1 hostname.example.com hostname This seemed to work fine with everything until I tried out ssh with kerberos (a recent endeavour). Somehow this configuration led to sshd resolving the machine's kerberos principal to "host/localhost@\n", which I suppose makes sense if it uses /etc/hosts for forward and reverse dns lookups in preference to external dns. So I commented out the latter line, and sshd magically started authenticating with gssapi-with-mic. Awesome. (Then I investigated localhost and asked the question)

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• Syntax Error when setting up Domain Alias

  - by Poundtrader

  I'm attempting to set up a domain alias via Pre VirtualHost Include and I'm recieving the following error: Error: An error occurred while running: /usr/local/apache/bin/httpd -DSSL -t -f /usr/local/apache/conf/httpd.conf Exit signal was: 0 Exit value was: 1 Output was: --- Syntax error on line 15 of /usr/local/apache/conf/includes/pre_virtualhost_global.conf: CustomLog takes two or three arguments, a file name, a custom log format string or format name, and an optional "env=" clause (see docs) --- Basically I have two domains, the main domain has an opencart installation within a directory (/buy) and I'm attempting to use the multi-store function which allows you to administer multiple stores on multiple domains via the one opencart dashboard. My issue is that I have the opencart installations within the /buy directory so I have been given the following code which should allow me to use this functionality over the multiple cPanel accounts within the same VPS. <VirtualHost 87.117.239.29:80> ServerName newdomain.co.uk ServerAlias www.newdomain.co.uk Alias /buy /home/originaldomain/public_html/buy/ DocumentRoot /home/newdom/public_html ServerAdmin [email protected] ## User newdom # Needed for Cpanel::ApacheConf <IfModule mod_suphp.c> suPHP_UserGroup newdom newdom </IfModule> <IfModule mod_ruid2.c> RUidGid newdom newdom </IfModule> CustomLog /usr/local/apache/domlogs/newdomain.co.uk-bytes_log “%{%s}t %I .\n%{%s}t %O .” CustomLog /usr/local/apache/domlogs/newdomain.co.uk combined ScriptAlias /cgi-bin/ /home/newdom/public_html/cgi-bin/ </VirtualHost> Does anyone know how to get this code to work? Thanks,

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• ipv6 : why ndp resolves to global scope address?

  - by Julien

  I'm facing a strange ipv6 behavior and I don't know how to solve it because I'm not familiar with ipv6. Maybe this behavior is normal. I hope that you will help me. ( I'm running under debian 6.0.9 with a custom kernel 3.2.58 ) machine A is "2a00:7d30:edf6:100::1" wants to ping machine B, which is "2a00:7d30:edf6:100::10". Both are on the same segment. machine A asks for the address of machine B and I don't understand why machine B gives its global scope address instead of the local scope one ? 10:59:02.082785 IP6 2a00:7d30:edf6:100::1 ff02::1:ff00:10: ICMP6, neighbor solicitation, who has 2a00:7d30:edf6:100::10, length 32 10:59:02.082821 IP6 2a00:7d30:edf6:100::10 2a00:7d30:edf6:100::1: ICMP6, neighbor advertisement, tgt is 2a00:7d30:edf6:100::10, length 32 after that machine A pings the global scope address of machine B and it works fine : 10:59:02.082927 IP6 2a00:7d30:edf6:100::1 2a00:7d30:edf6:100::10: ICMP6, echo request, seq 1, length 64 10:59:02.082960 IP6 2a00:7d30:edf6:100::10 2a00:7d30:edf6:100::1: ICMP6, echo reply, seq 1, length 64 Thank you for you help best regards Julien

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• Running Windows Update inside Windowx XP Mode

  - by Noam Gal

  I am working on a Win 7 Ultimate machine, and was using XP for some development tasks (for compatibility checks). Everything worked like a charm on the XP, including updates. Two days ago I had to switch computer (mainly a new motherboard/cpu), and I had just stuck my old HD inside the newer case. Win 7 worked like a charm - installed all the new drivers, identified everything automatically, no sweat. The trouble started when I tried running my old XP mode - it won't launch, complaining about the cpu change. I figured it's not a big deal, and I deleted the VM, and re-ran XP mode. It told me it can't find it, and offered to create a new one, just what I wanted. I had finished setting up the new XP mode VM, and it seems to work just fine. Got it to use the host network adapter, so I can surf from "inside". But I can't get Windows Update to run. Whenever I click on the "Custom" button on the WU site, after a short while, I get the [Error number: 0x80072EFD] page. I tried several solution from around the web for it (clearing some cache and restarting the wuauserv, even a microsoft fix-it run), but still nothing seems to work. Anyone here has any new tip for me? Thanks.

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• OpenSSL: how to setup an OCSP server for checking third-party certificates?

  - by StackedCrooked

  I am testing the Certificate Revocation functionality of a CMTS device. This requires me to setup a OCSP responder. Since it will only be used for testing I assume that the minimal implementation provided by OpenSSL should suffice. I have extracted the a certificate from a cable modem, copied it to my PC and converted it to the PEM format. Now I want to register it in the OpenSSL OCSP database and start a server. I have completed all these steps, but when I do a client request my server invariably responds with "unknown". It seems to be completely unaware of my certificate's existence. I would greatly appreciate if anyone would be willing to have a look at my code. For your convenience, I have created a single script consisting of a sequential list of all used commands, from setting up the CA until starting the server: http://code.google.com/p/stacked-crooked/source/browse/trunk/Misc/OpenSSL/AllCommands.sh You can also find the custom config file and the certificate that I am testing with: http://code.google.com/p/stacked-crooked/source/browse/trunk/Misc/OpenSSL/ Any help would be greatly appreciated.

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• OpenSSL: how to setup an OCSP server for checking third-party certificates?

  - by StackedCrooked

  I am testing the Certificate Revocation functionality of a CMTS device. This requires me to setup a OCSP responder. Since it will only be used for testing I assume that the minimal implementation provided by OpenSSL should suffice. I have extracted the a certificate from a cable modem, copied it to my PC and converted it to the PEM format. Now I want to register it in the OpenSSL OCSP database and start a server. I have completed all these steps, but when I do a client request my server invariably responds with "unknown". It seems to be completely unaware of my certificate's existence. I would greatly appreciate if anyone would be willing to have a look at my code. For your convenience, I have created a single script consisting of a sequential list of all used commands, from setting up the CA until starting the server: http://code.google.com/p/stacked-crooked/source/browse/trunk/Misc/OpenSSL/AllCommands.sh You can also find the custom config file and the certificate that I am testing with: http://code.google.com/p/stacked-crooked/source/browse/trunk/Misc/OpenSSL/ Any help would be greatly appreciated.

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• Backup with Mercurial and Robocopy?

  - by Andrew Neely

  The Problem We would like to backup our critical files from several network shares to a removable hard drive. We want to automate the backup so we don't have to remember to run it. It needs to finish overnight. Furthermore, we want to be able to preserve multiple versions of each file so we can back out of our user's mistakes easier. Background Information I work in a large Windows-based enterprise with a centralized IT section who is responsible for all backups. Their backups are geared towards disaster recovery and not user error, and require upper-level management approval for any non-disaster recoveries. Several times we have noticed that our backups have failed, we weren't notified. I do not have administrative rights to the server or my desktop. We are trying to backup some 198,000 files spanning about 240 gigabytes. These files rarely change. Our backup drive is one terabyte. My Proposed Solution What I would like to do is to write a batch file using Robocopy with the /mir option along with Mercurial SCM to store all versions of the file. I would do an hg add followed by an hg commit before each execution of Robocopy to save the current state, and then make a mirrored copy of the file structures. The problem is the /mir will delete every folder not present in the source, and Mercurial stores the repository in a .hg folder in the destination folder. Does anybody know how I could either convince Mercurial to store the .hg folder elsewhere, or convince Robocopy not to delete it from the destination? I'm trying to avoid writing a custom program do to copying.

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• Dell fumbles OpenManage installation process, forgets to write documentation?

  - by bwerks

  Hi all, I'm setting up a Dell PowerEdge 2950 for a small business, and I've just spent a while with Dell OpenManage Server Administrator 6.2, trying to clear the installation process of errors before I execute it. Right now I'm getting the following warning from the installer. The installer has detected that the HTTPS listener is not configured for Windows Remote Management. You can either configure the HTTPS listener before installing Remote Enablement, or install Remote Enablement now by selecting the "Custom" installation screen and configure the HTTPS listener later. See the "Remote Enablement Requirements" section in the "Dell OpenManage Installation and Security User's Guide" for information on configuring the HTTPS listener. Note: Remote Enablement is required to manage this system from a remote Server Administrator Web Server and is applicable only for those systems that support Server Instrumentation. Click here to configure HTTPs Listener for Windows Remote Management. The italicized line is a link, which executes...something...via cmd, and doesn't seem to help the problem. Not knowing exactly what to do here, I consulted the documentation. I read through the Setup and Administration section of the User's Guide, but all that it contained was a weird primer on role-based security and some SNMP stuff. The next section skips installation entirely and moved on to features of the suite. Thinking myself crazy, I consulted the readme, which told me that for installation I should consult the "Dell OpenManage Installation and Security Version 6.2 User's Guide" which not only doesn't exist in the documentation, but also not in all of google? Soo yeah, if anyone is familiar with this problem, drop me some knowledge!

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• 16TB Volumes and SNMP On Windows

  - by John K

  As volumes larger than 16TB became more common, it was recognized that the 32 bit value used to report disk size and usage within the standard "HOST-RESOURCES" MIB in SNMP was not large enough to report the proper disk size. Net-SNMP seems to have addressed this issue by simply manipulating the value of "AllocationUnits" to maintain a 32 bit value for disk utilization (since total disk size/usage is equal to the 32 bit space value times the allocation unit), to allow for the calculation of a volume larger than 8/16TB. Presuming you don't have any reporting interest in the allocation unit, this seems like a fine solution. https://bugzilla.redhat.com/show_bug.cgi?id=654384 Window's built in SNMP service, however, seems to continue to suffer from this error, simply reporting the modulo of the used/assigned disk space, resulting in inaccurate disk size reporting. Is there a way to enable Windows to correctly report disk usage for volumes over 16TB? We attempted to simply install Net-SNMP 5.5 x64 and disable Windows SNMP service entirely, however this unfortunately did not fix our issue. I've seen people in the Cacti community mention simply scripting out a solution. Unfortunately, we're using Observium for quick and basic systems monitoring. If the issue can't be correct on the Window's side, can Observium be made to report custom MIBs?

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• What would cause an IIS6 website to be unavailable remotely randomly for a few minutes at a time?

  - by jskunkle

  Website is served by iis6 on windows server 2003. Never saw this problem once for months in beta. We made the new site live yesterday - its getting more traffic than in beta but not that much - resource utilization on the server and speed are fine. Today the site has been unavailable remotely a few (4?) times for a few minutes at a time. If you visit any page on the site - nothing is ever returned and eventually the request times out. While this is happening - I can connect to the server via remote desktop and the site loads fine from the live url when running a browser on the server locally. Other websites on the server continiue to function fine the entire time (using the same instance of iis, different app pools). Other computers on the same network can't access the website either. Other than not serving content - the server seems to behave normally - scheduled jobs in our custom job system continue to run, etc. We've looked at the iis logs quickly and we don't see any traffic out of the ordinary - no traffic spikes, etc. Any ideas? Thanks, Shane

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• Replacing stock Core 2 Duo heatsink fan (just the fan really) with a Dell CPU fan

  - by user647345

  My old heatsink fan broke and I'm trying to reconnect its plugs to a new fan. My Dell CPU fan has some custom Dell plug. I snipped the old fan's wire in half and kept the plug on the end of it. I want to connect it to the Dell fan wire to the plug. The motherboard is a P5Q-e, the stock Core 2 Duo fan was .20A and the dell is .70A. Is that going to matter? The wire from the fan has four wires, the wire with the plug has four wires. They share three, of the four colors: red, black, and blue. Dell's fourth wire is white, while the plug's fourth wire is yellow. Is it safe to assume that I just connect the yellow and the white plug together and match the rest up? I don't want to take any risk of damaging anything. It runs fine passively without a fan, but I have speedstep on, so I would like to use this fan and just fasten it to the heatsink with some twist ties and paperclips and call it a day.

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• Question about Displaying Documents and the CQWP in MOSS 2007

  - by Psycho Bob

  My organization is in the process of converting our intranet over to a SharePoint solution. Part of this intranet will be the movement and organization of all our internal documents. Currently, we have 11 pages of document links, each with its own subheadings. So far I have it set where each document has a custom field called "Page" with a check box list of all the document pages on the intranet site. On each individual page, I have setup a Content Query Web Part that displays the documents that have the corresponding Page value set (i.e. if a document Page value has been checked for "HR" it will appear on the HR page). The goal of this setup is to allow the nontechnical personal who will be responsible for the maintenance of the documents to be able to upload new documents to the documents list and note on which pages they should appear on without having to manually update the pages themselves. The problem that I am having is that I cannot seem to find a good way to sort the documents into their subheadings once they are on the appropriate page. I could create individual check boxes for each page/subheading combination, but this would create a list of approximately 50-75 items. Does anyone have any ideas as to how I could accomplish this, either via CQWP or by different means? Goals/Requirements of Installation Allow Intranet documents to be maintained by nontechnical personnel Display documents on the appropriate pages without user having to edit actual page or web part Denote document page location using user settable document attributes (if possible) Maintain current intranet organization and workflow Use only one document list without subdirectories NOTE: I am aware that this is not the most efficient or elegant way to do things, but these are the requirements I have been given for the project.

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• Ubuntu root privs installation issue

  - by Pam

  I am a fairly new Ubuntu user (and Linux user, for that matter) and I just downloaded a program whose installer was a .sh file. Not thinking, I copied the installer to an /opt subdirectory, thinking that I was going to install the application there: sudo cp ~/Downloads/fooInstaller.sh /opt/someDir I can't remember, but I either had to use sudo because /opt required it, or I just used it without thinking, but in any case, I prefixed with sudo. Once in /opt/someDir, I executed the installer again, using sudo: sudo sh fooInstaller.sh The terminal went crazy, and a few seconds later, a graphical install wizard popped up that guided me through the rest of the process. At the end of the wizard I was prompted to launch the program, and I did, and everything was great. Until... I closed the program, and attempted to add it to my Ubuntu "panel" (the icon panel at the top of the screen). The program was installed to /usr/local/foo/theProgram, and so I specified that URL as the command in the custom app launcher. When I open the program through the panel/launcher (at the top of the screen), the program doesn't load or operate correctly. I get a lot of error messages complaining about being denied permissions. I'm assuming that this is a "superuser/installation/privs" issue, and not a problem with the application (hence this post at superuser.com instead of the application's forums), because when I launch the program from the terminal with sudo, it opens and executes perfectly fine, just like it did the first time around after the install wizard finished. I realize I'm probably going to have to uninstall the program completely, and re-install it differently. Finally, my question: After uninstalling, can I avoid all these issue by just running the installer (sh fooInstaller.sh) right out of my Downloads directory, sans the sudo prefix? If not, how do I get the program to install without root privs so that I can add it to my panel/launcher and get it executing correctly? Sorry for the long post but I didn't want to omit any details because, as I'm sure you can tell, I'm not really sure I know what I'm doing. Thanks for any help here!

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• Using secure proxies with Google Chrome

  - by cYrus

  Whenever I use a secure proxy with Google Chrome I get ERR_PROXY_CERTIFICATE_INVALID, I tried a lot of different scenarios and versions. The certificate I'm using a self-signed certificate: openssl genrsa -out key.pem 1024 openssl req -new -key key.pem -out request.pem openssl x509 -req -days 30 -in request.pem -signkey key.pem -out certificate.pem Note: this certificate works (with a warning since it's self-signed) when I try to setup a simple HTTPS server. The proxy Then I start a secure proxy on localhost:8080. There are a several ways to accomplish this, I tried: a custom Node.js script; stunnel; node-spdyproxy (OK, this involves SPDY too, but later... the problem is the same); [...] The browser Then I run Google Chrome with: google-chrome --proxy-server=https://localhost:8080 http://superuser.com to load, say, http://superuser.com. The issue All I get is: Error 136 (net::ERR_PROXY_CERTIFICATE_INVALID): Unknown error. in the window, and something like: [13633:13639:1017/182333:ERROR:cert_verify_proc_nss.cc(790)] CERT_PKIXVerifyCert for localhost failed err=-8179 in the console. Note: this is not the big red warning that complains about insecure certificates. Now, I have to admit that I'm quite n00b for what concerns certificates and such, if I'm missing some fundamental points, please let me know.

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• Best way to 'harden' embedded ext4 file server against unexpected loss of power?

  - by Jeremy Friesner

  Hi all, First, a little background: my company makes an audio streaming device that is a headless, rack-mounted Linux box with a couple of SSDs attached. Each SSD is formatted with ext4. The users can connect to the system using Samba/CIFS to upload new audio files or access existing ones. There is also custom software for streaming out audio over the network. This is all fine. The only problem is that the users are audio people, not computer people, and see the system as a 'black box', not as a computer. Which means that at the end of the day, they aren't going to ssh in to the box and enter "/sbin/shutdown -h"; they are just going to cut power to the rack and leave, and expect things to still work properly the next day. Since ext4 has journalling, journal checksumming, etc, this mostly works. The only time it doesn't work is when someone uploads a new file via Samba and then cuts power to the system before the uploaded data has been fully flushed to the disk. In that case, they come in the next day and find that their new file has been truncated or is missing entirely, and are unhappy. My question is, what is the best way to avoid this problem? Is there a way to get smbd to call "sync" at the end of every upload? (Performance on uploads isn't so important, since they only happen occasionally). Or is there a way to tell ext4 to automatically flush within a few seconds of any change to a file? (Again, performance can be sacrificed for safety here) Should I set a particular write-ordering mode, activate barriers, etc?

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• Refresh file access time under Linux / Discard disk read cache

  - by calandoa

  I am making use of the access time to analyse some build process, but it is not working the way I want: the access time is updated the first time I read the file, then it stays the same for a long while, or until the next reboot. For instance: $ ll -u some_file -rw-r--r-- 1 root root 1.3M 2010-04-07 10:03 some_file $ grep abcdef some_file $ ll -u some_file -rw-r--r-- 1 root root 1.3M 2010-04-07 11:24 some_file # The access time is updated # waiting a few minutes... $ grep abcdef some_file $ ll -u some_file -rw-r--r-- 1 root root 1.3M 2010-04-07 11:24 some_file # The access time has not been updated :( I suppose that the file is buffered by Linux in the free memory, the only this copy is accessed the subsequent times for speed reasons. A solution would be to discard the buffers in memory. After searching some forums, I found: sync echo 1 > /proc/sys/vm/drop_caches echo 2 > /proc/sys/vm/drop_caches echo 3 > /proc/sys/vm/drop_caches But it is not working, it seems that it only sync up the write buffers, not the read ones. May be it is due to some custom kernel configuration on my distro (fedora 9)? Or I am missing something here? Is there a way to achieve this access time refresh? Note also that I do not want to simulate some writes on my entire file tree. Because I am using some makefile based build system, this will cause the entire project to be build again.

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• How much does a computer actually cost?

  - by Cawas

  Ok, so when you buy a new notebook, you spend about $1 or $2 thousand with the OS included. When you make your own desktop machine you can get as low as $100 for a good one today, with not a single piece of software included. It can't be much lower, but it can go lot higher. People, including myself, tend to believe that's the price of a computer, but then there comes the softwares. I just stumbled upon a nice piece of application I could use myself, but it's very specific, very tiny, and most people would never bother about this. And it costs "just $12". That is a lot for something I may use just once or twice! OS upgrades, hardware malfunction, and your custom set of software actually raise the computer price quite a lot, thus this question: how much we pay in the end for our personal computers? I'd like to see some statistics on that. Maybe divided into 3 categories or something, but some data with averages, minimum and "maximum" costs would be very nice. Maybe a "cost per year" would be nice. Just wondering.

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