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  • Clustering/load balancing for cluster unaware applications

    - by AaronLS
    Forgive me if I use any of these terms incorrectly. I am wondering if there is any kind of software that would allow my two "join" two computers together such that a cluster unaware application could utilize their combined computing resources? By "cluster unaware" I mean an application that isn't designed to share work across multiple services. My understanding is that clustering is enabled by the specific application by it's architecture, such that messaging with multiple instances of the application coordinate the sharing of work. Instead I am looking for something that enables clustering at the OS or virtualization level, so that any application could essentially be clustered. Failing that, I am also wondering about the following scenario: We have 3 different applications we will call A, B, and C. We have 2 single core computers. At any given time lets say that any combination of those applications will be CPU intensive. In cases where only 2 of those apps are very active, have one of them moved over to a different server. In a nutshell, some sort of dynamic automatic shuffling of the application's load. I have heard of virtual machines that can be migrated across physical machines while live, but I am wondering if this can be done automatically in response to an application's or VM's CPU activity?

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  • How to mount vfat drive on Linux with ownership other than root?

    - by Norman Ramsey
    I'm running into trouble mounting an iPod on a newly upgraded Debian Squeeze. I suspect either a protocol has changed or I've tickled a bug, which I don't know where to report. I'm trying to mount the iPod so that I have permission to read and write it. But my efforts come to nothing: $ sudo mount -v -t vfat -o uid=32074,gid=6202 /dev/sde2 /mnt /dev/sde2 on /mnt type vfat (rw,uid=32074,gid=6202) $ ls -l /mnt total 80 drwxr-xr-x 2 root root 16384 Jan 1 2000 Calendars drwxr-xr-x 2 root root 16384 Jan 1 2000 Contacts drwxr-xr-x 2 root root 16384 Jan 1 2000 Notes drwxr-xr-x 3 root root 16384 Jun 23 2007 Photos drwxr-xr-x 6 root root 16384 Jun 19 2007 iPod_Control $ sudo umount /mnt $ sudo mount -v -t vfat -o uid=nr,gid=nr /dev/sde2 /mnt /dev/sde2 on /mnt type vfat (rw,uid=32074,gid=6202) $ ls -l /mnt total 80 drwxr-xr-x 2 root root 16384 Jan 1 2000 Calendars drwxr-xr-x 2 root root 16384 Jan 1 2000 Contacts drwxr-xr-x 2 root root 16384 Jan 1 2000 Notes drwxr-xr-x 3 root root 16384 Jun 23 2007 Photos drwxr-xr-x 6 root root 16384 Jun 19 2007 iPod_Control As you see, I've tried both symbolic and numberic IDs, but the files persist in being owned by root (and only writable by root). The IDs are really mine; I've had the UID since 1993. $ id uid=32074(nr) gid=6202(nr) groups=6202(nr),0(root),2(bin),4(adm),... I've put an strace at http://pastebin.com/Xue2u9FZ, and the mount(2) call looks good: mount("/dev/sde2", "/mnt", "vfat", MS_MGC_VAL, "uid=32074,gid=6202") = 0 Finally, here's my kernel version from uname -a: Linux homedog 2.6.32-5-686 #1 SMP Mon Jun 13 04:13:06 UTC 2011 i686 GNU/Linux Does anyone know if I should be doing something different, or If there is a workaround, or If this is a bug, where it should be reported?

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  • MacPorts pHash not showing up in Python

    - by Nitzan Wilnai
    I am having a problem where python does not show pHash installed even though I installed it using macports. I made sure I am using the MacPorts version of Python by doing: sudo port select --set python python27 I then installed pHash by doing: sudo port install pHash. It installed without any errors. When I call help('modules'), I do not see pHash listed among the installed packages. Any ideas on why python is not seeing the pHash install by MacPorts? Calling port select --list python shows the following: Available versions for python: none python25-apple python26-apple python27 (active) python27-apple Printing out sys.path outputs the following: (reformatted to make it easier to read here) ['/Library/Python/2.7/site-packages/boto-2.9.9-py2.7.egg', '/Library/Python/2.7/site-packages/setuptools-0.9.8-py2.7.egg', '/Library/Python/2.7/site-packages/pip-1.4.1-py2.7.egg', '/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python27.zip', '/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7', '/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin', '/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac', '/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages', '/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk', '/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old', '/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload', '/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages', '/Library/Python/2.7/site-packages'] Can anyone help? Thanks.

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  • How to repair a damage transaction log file for Exchange 2003

    - by Markus Larsson
    Hi! Yesterday we had a power failure and the UPS did not work (it has worked perfect before). Everything seem to be ok when I started all the servers again except of the mail, when I try to mount the store I get the following message: “The database files in this store are corrupted” Server: Exchange 2003 running on a Small Business Server Latest full backup: one week old Backup program: Backup Exec 9.0 This is what I have done: 1. Copy every file in the MDBDATA folder (edb, stm, log) 2. Run Eseutil /d for priv1.edb 3. Run Eseutil /p for priv1.edb (took seven hours) 4. Run Isintig –fix –test alltests, now it breaks down. Isintig fails with the following error: Isinteg cannot initiate verification process. Please review the log file for more information. The problem is that there is no log file created. 5. Giving up on this route I decide to do a restore from the backup, it fails with the following error: Unable to read the header of logfile E00.log. Error -501, and the error: Information Store (5976) Callback function call ErrESECBRestoreComplete ended with error 0xC80001F5 The log file is damaged. My conclusion is that E00.log is damage, so how can I repair it so that I can restore the database? Or should I give up and try some other route?

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  • Why won't 2GB of ram across 3 of 4 slots work on my motherboard (max 2GB)?

    - by Andrew
    My desktop is an old home-built machine circa 200[5-6] running Ubuntu 11.10 (but this is not relevant because I'm reading available ram from BIOS loading screen), with an ASUS P5GPL motherboard, not X or X-SE - it has four slots. I'm mainly a laptop person, but keep this around for running a server from if needed, backing up to, seeding Ubuntu to people from, etc… It has four (DDR) ram slots, two black and two blue, in the order black-blue-black-blue (I will call them D, C, B, and A, respectively) with some space in the middle. The blue ones are the closest to the processor. I used to have two 512MB chips in the two blue slots. I just got a 1GB chip and plugged it into one of the black slots; my system didn't recognize it. I messed around and discovered that it will not recognize chips in many positions, and I couldn't get it to recognize all three of these chips at the same time. In particular, if I put the 512MB chips in A and B it would only use 1, but AC, AD, BD, and CD worked. I didn't try BC, I believe. Only some of these continue to work when I switch the 1GB chip into one of these positions. Can I have some advice as to how to position these chips to get all 2GB used? How about if I get another 1GB chip - where should I put the two? And what about the RAM maximum Crucial says? Can I go above 2GB, if I get another 1GB chip? Right now, I have a 512MB chip in A and the 1GB chip in C. EDIT: I read some other posts and tried dmidecode in Ubuntu to clarify the max memory question, that wasn't a major part anyways. It says my max memory module size is 1024M (OK) and my max memory size is 4096M (doesn't agree with Crucial OR the Asus web site, maybe it will only work while in Linux and BIOS won't OK it?).

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  • Hard drive failed, suspected filesystem corruption, still cannot salvage any data from harddrive

    - by Hippy-Head
    Firstly, I am terribly sorry if this is a duplicate, but I couldn't find a similar issue to mine, so here goes. I have a 1TB hdd bought around 8 months ago used as backup hard drive. I have not used the drive for a period of time whatsoever, and when I was trying to get back to some files on it, it was completely wiped just like that. At first it would not boot I tried everything from command line chkdsk and filesystem recovery software to rebuilt it. After a few attempts I managed to initialize it, at that time it was an achievement. The problems started when I tried to recover the data inside, I have used A LOT of software free and commercial software on both Mac and Windows, with the help of cmd or Terminal commands, however no data of any kind was recovered, even after leaving it thoroughly scan for around 9-10 hours all night sometimes longer, with no results at all. I am somewhat desperate, I am usually good at retrieving data from corrupt hard drives, but this is not the case. Call me paranoid, but I do not want to give it to someone to fix it for me, as I have a lot of photos and personal stuff that I do not want anyone to see.

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  • WAMP starts Apache or Mysql, but not both?

    - by ladenedge
    When I install WAMP, the Apache and Mysql services are set to run as the LocalService user and all works well. However, because I need to access remote UNC paths in my PHP code, I need to run at least Apache as a user that exists on both the local host and the remote host - I'll call him WampUser. When both Apache and Mysql are set to start as WampUser, I cannot start both at the same time. If both are stopped, I can start either successfully. When I attempt to start the other, I get Error 1053: The service did not respond to the start or control request in a timely fashion. This error appears immediately - there is no timeout. When at least one of the services is set to start as LocalService, both start fine. I can, therefore, solve my problem by setting Apache to WampUser and Mysql to LocalService, but I'm more interested in why this is happening in the first place. I'm especially curious because this situation does not occur on other servers - something I've done to this server has made these two services exclusive when running as the same user. Here are some miscellaneous data points: I am using Windows Server 2003. I've provided recursive Full Control to the C:\wamp directory for WampUser. Nothing appears in the event log after the service fails. No log entries appear in either the Mysql log or the Apache error log. Neither application appears in the process list when the appropriate service is stopped. Any ideas?

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  • Wireless USB keyboard and mouse can wake system, but then receiver is inactive

    - by BlueMonkMN
    I have a Microsoft brand USB device that acts as a receiver for a wireless Microsoft Keyboard and a wireless Mouse. When it's operating normally, there are LEDs on the device indicating Caps Lock, Num Lock and Function Lock, of which the latter 2 are usually lit. It is plugged into a Dell Isnpiron 531 with Windows 7 32-bit running on an AMD Athlon 64 X2 Dual Core processor 5000+. When the computer goes to sleep (the power indicator on the main box is flashing), I can wake it by moving the mouse. So far all is good. However, something changed in, I think, the past couple weeks (I suspect due to a Microsoft driver update problem). Before the change, after waking the computer, everything would operate normally as far as I could tell, but now after waking the computer, the receiver has no lights on, and the keyboard and mouse are completely unresponsive (which is odd, considering the mouse woke up the computer). There is a button on the receiver that's supposed to reset the wireless connection and flash the lights while it does so, but it has no effect in this state. It's like the receiver doesn't have power (but how would the system know I moved the mouse, unless the power was on until it woke up?). I have checked the BIOS/CMOS settings or whatever you call them, and did not see anything related to USB in the power management section. I have checked Windows 7 device manager and ensured that all the USB Root Hub devices have the setting unchecked for allowing the USB power to be turned off. Like I said, this was working before, and the only thing I can think of that's changed is applying Windows Updates.

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  • TFS 2012 and MS SQL 2008r2

    - by Vadim911
    When I try to call TFS 2012 warehouse control web service (WarehouseControlService.asmx) I got following error: Exception Message: Could not load file or assembly 'Microsoft.AnalysisServices, Version=10.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91' or one of its dependencies. The system cannot find the file specified. (type FileNotFoundException) Exception Stack Trace:    at Microsoft.TeamFoundation.Warehouse.WarehouseConfigurationService.RebuildOLAPDatabase(TeamFoundationRequestContext requestContext, String olapServerInstanceName, String databaseName, String warehouseServerInstanceName, String warehouseDatabaseName, Int32 translationLCID, Boolean checkAndUpdateJobs)    at Microsoft.TeamFoundation.Warehouse.WarehouseConfigurationService.RebuildOLAPDatabase(TeamFoundationRequestContext requestContext, String olapServerInstanceName, String databaseName, String warehouseServerInstanceName, String warehouseDatabaseName, Int32 translationLCID)    at Microsoft.TeamFoundation.Management.SnapIn.ApplicationTierNode.RebuildReporting(IntPtr hwnd, IRefreshable panel) Inner Exception Details: Exception Message: Could not load file or assembly 'Microsoft.AnalysisServices, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91' or one of its dependencies. The system cannot find the file specified. (type FileNotFoundException) Exception Stack Trace:    at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)    at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)    at System.Reflection.Assembly.Load(AssemblyName assemblyRef)    at Microsoft.TeamFoundation.Common.Internal.TfsAssemblyResolver.OnAssemblyResolve(Object sender, ResolveEventArgs args)    at System.AppDomain.OnAssemblyResolveEvent(RuntimeAssembly assembly, String assemblyFullName) It is strange because I have installed ms sql connectivity. Is it issue connected with the fact that I try to use tfs 2012 with ms sql 2012? Please advise how to resolve issue networked above.

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  • Easiest way to send encrypted email?

    - by johnnyb10
    To comply with Massachusetts's new personal information protection law, my company needs to (among other things) ensure that anytime personal information is sent via email, it's encrypted. What is the easiest way to do this? Basically, I'm looking for something that will require the least amount of effort on the part of the recipient. If at all possible, I really want to avoid them having to download a program or go through any steps to generate a key pair, etc. So command-line GPG-type stuff is not an option. We use Exchange Server and Outlook 2007 as our email system. Is there a program that we can use to easily encrypt an email and then fax or call the recipient with a key? (Or maybe our email can include a link to our website containing our public key, that the recipient can download to decrypt the mail?) We won't have to send many of these encrypted emails, but the people who will be sending them will not be particularly technical, so I want it to be as easy as possible. Any recs for good programs would be great. Thanks.

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  • SSL with nginx on subdomain not working

    - by peppergrower
    I'm using nginx to serve three sites: example1.com (which redirects to www.example1.com), example2.com (which redirects to www.example2.com), and a subdomain of example2.com, call it sub.example2.com. This all works fine without SSL. I recently got SSL certs (from StartSSL), one for www.example1.com, one for www.example2.com, and one for sub.example2.com. I got them set up and everything seems to work (I'm using SNI to make all this work on a single IP address), except for sub.example2.com. I can still access it fine over non-SSL, but on SSL I just get a timeout. If I go directly to my server's IP address, I get served the SSL certificate for sub.example2.com, so I know nginx is loading the certificate properly...but somehow it doesn't seem to be listening for sub.example2.com on port 443, even though I told it to. I'm running nginx 1.4.2 on Debian 6 (squeeze); here's my config for sub.example2.com (the other domains have similar configs): server { server_name sub.example2.com; listen 80; listen 443 ssl; ssl_certificate /etc/nginx/ssl/sub.example2.com/server-unified.crt; ssl_certificate_key /etc/nginx/ssl/sub.example2.com/server.key; root /srv/www/sub.example2.com; } Does anything look amiss? What am I missing? I don't know if it matters, but StartSSL lists the base domain as a subject alternative name (SAN); not sure if that would somehow pose problems, if both subdomains list the same SAN.

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  • PostgreSQL lots of large Arrays and Writes

    - by strife911
    Hi, I am running a python program that spawns 8 threads and as each thread launch its own postmaster process via psycopg2. This is to maximize the use of my CPU-cores (8). Each thread call a series of SQL Functions. Most of these functions go through many thousands of rows each associated to a large FLOAT8[] Array (250-300) values by using unnest() and multiplying each FLOAT8 by an another FLOAT8 associated to each row. This Array approach minimized the size of the Indexes and the Tables. The Function ends with an Insert into another Table of a row of the same form (pk INT4, array FLOAT8[]). Some SQL Functions called by python will Update a row of these kind of Tables (with large Arrays). Now I currently have configured PostgreSQL to use most of the memory for cache (effective_cache_size of 57 GB I think) and only a small amount of it for shared memory (1GB I think). First, I was wondering what the difference between Cache and Shared memory was in regards to PostgreSQL (and my application). What I have noticed is that only about 20-40% of my total CPU processing power is used during the most Read intensive parts of the application (Select unnest(array) etc). So secondly, I was wondering what I could do to improve this so that 100% of the CPU is used. Based on my observations, it does not seem to have anything to do with python or its GIL. Thanks

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  • Monit - script not being executed as expected

    - by Thaís
    I'm working on a Windows 7 machine, having a VM for Ubuntu (image disk: 12.04-desktop-i386.iso). On the VM I installed Monit 5.3.2, and configured some processes and applications. So I created a script to run my application. This application should display some content on the screen (Im basically displaying two images, using Feh). The thing is: if I call my script through the command line, it runs ok, and display the images. But if I run through monit, it seems to be running ok, but it doesn't display the images.In the case I try to debug it (remote debug), then I can see the images. So I was supposing this could be some kind of configuration, but didn't find out what (even using the option -I wou'ldn't work). I"m showing below more details: -Piece of script on Monit---- check program runMediaHandler with path "/usr/bin/runMediaHandler.sh" if status == 1 then alert -runMediaHandler.sh ---- #!/bin/bash java -jar /home/thais/Desktop/MediaHandler_RC2.jar Summarizing: 1.What works: if I run java directly: java -jar /home/thais/Desktop/MediaHandler_RC2.jar if I run the script directly: runMediaHandler.sh if I remote debug putting a breakpoint where the image should be displayed 2.What does not work: putting that piece of information on Monit to "check program", writen above (even if calling monit -I start runMediaHandler) Thank you in advance, Thaís

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  • Problem importing pictures from a digital camera with Windows 7

    - by snark
    Hi, Since I'm using Windows 7 (Beta, then RC, now RTM), I have issues when I download pictures from my digital cameras. It happens with my 2 cameras: a Canon Powershot S2 IS and a Canon Ixus 80 IS. When I plug a camera (any of them) to a USB port and switch it on in Play mode, the Autoplay function of Windows 7 starts with this screen: I select "Import pictures and videos" to call the native Windows 7 tool. It searches a bit for pictures to download from the camera and starts the transfer. However, during the transfer, I often get errors like this one: If I use "Try again", it works fine the second time and the picture is retrieved correctly. It's very annoying when it happens 20 or 30 times in a 500-picture download. I cannot leave it running standalone, as I have to watch for the errors and click on "Try again". Any idea what is causing these errors? I tried changing the USB port (normally the cameras are connected via a USB hub but it happens also when I connect them directly to a MB USB port) and the USB cable, but no success. I also checked the SD card by connecting them with a card reader and running a ChkDsk on them but it found no errors on the cards. Update: No problem when I copy the pictures manually with the Windows Explorer. And no problem either when I access the card with a reader. The builtin import tool of Windows is convenient as it sorts the pictures automatically by date (1 folder per day). And this is the way I sort my pictures

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  • Nvidia GTS 360M in Asus laptop shuts off when gaming on external display

    - by mr odus
    I have had this problem on my Asus G51j Intel I5, Nvidia GTS360M graphics card. Just updated the drivers to latest off Nvidias site. Most games I play, If I hook it up through an external monitor(this happens whether it's HDMI or VGA). The laptop hard shuts down after about 20 minutes, give or take. This tends to happen on more graphically intense games like Call of dutys, bioshock. I'm running Windows 7, latest nvidia drivers. Games work fine on my laptops screen, and Movies, general computing work fine on the external displays. The laptop always sits on a cooling pad and the latest time was in front of my AC unit, I ran heatfan or whatever the heat tracking software was, and my temperatures were normal through a shut down. This has been happening for the life of the laptop. I dont play very many games, and even fewer on an external monitor, so this issue doesnt come up much Is it possible I have a faulty graphics card? Is there anything else I can try?

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  • moving plone or recovering data

    - by Atilla Filiz
    I had a simple plone site running on my Ubuntu 8.10 box, setup by following instructions on https://help.ubuntu.com/community/forum/server/Plone Now the computer got an Ubuntu 9.04 install from scratch, and I want to get the site up and running. As far as I understand several python libraries from 9,04 are not compatible with plone. I tried installing plon3-site from ubuntu repos, and I got this: $bin/instance start Traceback (most recent call last): File "bin/instance", line 103, in ? import plone.recipe.zope2instance.ctl File "/media/Robocup2009/robocup2009/eggs/plone.recipe.zope2instance-2.7-py2.4.egg/plone/recipe/zope2instance/__init__.py", line 16, in ? import zc.buildout File "/media/Robocup2009/robocup2009/eggs/zc.recipe.egg-1.1.0-py2.4.egg/zc/__init__.py", line 1, in ? __import__('pkg_resources').declare_namespace(__name__) ImportError: No module named pkg_resources I have python-pkg-resources installed. I actually don't care about plone, I just found it easy to use. My site is just photo and video archive of several users, with low traffic but several gigabytes of data. What would you suggest? Is it easier to get plone working on my box and start my instance(how?), or recover the content from the instance folder(how?) and setup another content management system(which?)

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  • Odd behavior of setting REMOTE_ADDR between Apache, Nginx, and AWS ELB

    - by Chris Drumgoole
    I have encountered a strange issue and am curious if others have encountered this as well. and if there is absolutely anything that can be done.. We have a set up where we have multiple AWS EC2 Linux machines sitting behind a ELB. The EC2 machines are running Nginx. Let's refer to these as my production machines (because they are!) I also have a Rackspace cloud machine running apache. Completely separate. Let's call this the test server. Now, there's a ISP here in Singapore that seems to be funneling traffic through a transparent proxy or something, and when you do a IP check, the IP often changes. In fact, I noticed that when I check on http://www.whatismyip.com, the ip seems to be stable (doesn't change) across refreshes. But, http://www.whatismyipaddress.com, on refreshing, the IP changes! (so my ISP is doing weird stuff). Now, back to my set up, I noticed a couple of things: Checking the REMOTE_ADDR variable from PHP when connecting to a single Nginx production machine (bypassing the load balancer), is set to the stable IP that does change. Checking the REMOTE_ADDR variable from PHP when connecting to the test Apache server, it is set to the IP that does change on refreshes. Checking the headers when connecting to the nginx production machines through the ELB, the ELB sets the HTTP_X_FORWARDED_FOR to the stable IP. Has anyone experienced this odd behavior? Is there nothing that I can do? And which IP should I "trust"? (the one Apache gives, or the one ELB and Nginx gives?) Thanks! Chris

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  • Freebsd Secondary Group not allowing folder deletion

    - by Jarrod Juleff
    TLDR: I have a user that is a member to a group as a secondary group. This user can delete files with 664 perms as a secondary user, but not directories with perms of 775. Details: I have a user. Lets call him ftpuser. I use him to upload and download files to my devbox. The user's primary group is "ftp" and is also in the group "www" as a secondary group. My web server runs as user www and group www, and I have proftpd (running as www and www) configured to drop all files into the needed directories as www and www (for file ownership) and perms 664 on files and 775 on directories. My problem is (tried with 2 ftp clients) the ftp client can delete the files, but not the folders. Filezilla returns 550 permission denied. The owner only can delete flag is not set, and I've triple checked the permissions and they are indeed 775. Its driving me nuts to have to log into my server to manually delete folders every time. Some of the folders and files are created by 1 of my php scripts, but the permissions are getting set properly when I check the files' properties. Directory and file creation works phenomenal. Can delete files, just not directories. Freebsd 9.0 Running in VirtualBox (32bit all the way around) Proftpd (running as www and www) as ftp server (tried using both dreamweaver and filezilla as the clients) Basic amp setup (apache,mysql,and php).

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  • mpirun -np N, what if N is larger than my core number?

    - by Daniel
    Say I have a 4-core workstation, what would linux (Ubuntu) do if I execute mpirun -np 9 XXX Q1. Will 9 run immediately together, or they will run 4 after 4? Q2. I suppose that using 9 is not good, because the remainder 1, it will make the computer confused, (I don't know is it going to be confused at all, or the "head" of the computer will decide which core among the 4 cores will be used?) Or it will be randomly picked. Who decide which one core to call? Q3. If I feel my cpu is not bad and my ram is okay and large enough, and my case is not very big. Is it a good idea in order to fully use my cpu and ram, that I do mpirun -np 8 XXX, or even mpirun -np 12 XXX. Q4. Who decides all of these effciency optimization, Ubuntu, or linux, or motherboard or cpu? Your enlightenment would be really appreciated.

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  • GNU screen multiuser mode is broken in OS X 10.6 (Snow Leopard)

    - by schustafa
    I'm using GNU screen for remote pair programming. Let's call the local account for the remote user 'pairpair'. I have the following lines in my .screenrc: multiuser on acladd pairpair I have run sudo chmod u+s /usr/bin/screen. However, when the remote user tries to connect to my screen with the command screen -r [my_account_name]/[pid_of_screen] I receive the following message: Attach attempt with bad pid(xxx) The pid listed in the error message matches the pid of the screen process run by the remote user. The remote user's screen process hangs; my screen session continues happily along after the error message disappears. I've tried using both the built-in screen (at /usr/bin/screen) and the screen available from MacPorts, but I get the same error in both cases. This worked on OS X 10.5 (Leopard). I've googled around for the error message, but most of the hits relate to some BSD bug from 2003 or so (which was fixed). Has anyone else seen this behavior? Does anyone have any idea how to make multiuser support in screen work in SL?

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  • POST Fail via AJAX Request?

    - by Jascha
    I can't for the life of me figure out why this is happening. This is kind of a repost (submitted to stackoverflow, but maybe a server issue?). I am running a javascript log out function called logOut() that has make a jQuery ajax call to a php script... function logOut(){ var data = new Object; data.log_out = true; $.ajax({ type: 'POST', url: 'http://www.mydomain.com/functions.php', data: data, success: function() { alert('done'); } }); } the php function it calls is here: if(isset($_POST['log_out'])){ $query = "INSERT INTO `token_manager` (`ip_address`) VALUES('logOutSuccess')"; $connection->runQuery($query); // <-- my own database class... // omitted code that clears session etc... die(); } Now, 18 hours out of the day this works, but for some reason, every once in a while, the POST data will not trigger my query. (this will last about an hour or so). I figured out the post data is not being set by adding this at the end of my script... $query = "INSERT INTO `token_manager` (`ip_address`) VALUES('POST FAIL')"; $connection->runQuery($query); So, now I know for certain my log out function is being skipped because in my database is the following data: if it were NOT being skipped, my data would show up like this: I know it is being skipped for two reasons, one the die() at the end of my first function, and two, if it were a success a "logOutSuccess" would be registered in the table. Any thoughts? One friend says it's a janky hosting company (hostgator.com). I personally like them because they are cheap and I'm a fan of cpanel. But, if that's the case??? Thanks in advance. -J

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  • netsnmp - how to register string?

    - by user1495181
    I use net-snmp. I try to add my own mibs (no need in handler, just a MIB that i can get and set by snmp call), so i followed the scalar example. In order to add my own mibs i defined them in the mib file and create an agent extension.(see below). It work, so i have now an integer MIB. Now i want to add string mib, so i define the MIB , but i dont find a register API for string, like i have for the int - netsnmp_register_int_instance. I look in the includes file , but dosnt found matching one. agent: #include <net-snmp/net-snmp-config.h> #include <net-snmp/net-snmp-includes.h> #include <net-snmp/agent/net-snmp-agent-includes.h> #include "monitor.h" static int int_init = 0; /* default value */ void init_monitor(void) { oid open_connections_count_oid[] = { 1, 3, 6, 1, 4, 1, 8075, 1, 0 }; netsnmp_register_int_instance("open_connections_count", open_connections_count_oid, OID_LENGTH(open_connections_count_oid), &int_init, NULL); }

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  • Apache reverse proxy access control

    - by Steven
    I have an Apache reverse proxy that is currently reverse proxying for a few sites. However i am now going to be adding a new site (lets call it newsite.com) that should only be accessible by certain IP's. Is this doable using Apache as a reverse proxy? I use VirtualHosts for the sites that are being proxyied. I have tried using the Allow/Deny directives in combination with the Location statements. For example: <VirtualHost *:80> Servername newsite.com <Location http://newsite.com> Order Deny,Allow Deny from all Allow from x.x.x.x </Location> <IfModule rewrite_module> RewriteRule ^/$ http://newsite.internal.com [proxy] </IfModule> I have also tried configuring allow/deny specicaily for the site in the Proxy directives, for example <Proxy http://newsite.com/> Order deny,allow Deny from all Allow from x.x.x.x </Proxy> I still have this definition for the rest of the proxied sites however. <Proxy *> Order deny,allow Allow from all </Proxy> No matter what i do it seems to be accessible from any where. Is this because of the definition for all other proxied sites. Is there an order to which it applies Proxy directives. I have had the newsite one both before and after the * one, and also within the VirtualHost statement.

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  • Mac Security - Which one?

    - by Bob Rivers
    Hi, Recently I had my credit card cloned. A few hours after shopping at an online store (in which I trust and buy since 2006) I received a call from my bank asking if I recognize a $5,000 debt to a store(?!) called Church of Christ... I'm a Mac user (OS X 10.6.3). I always kept my system updated and I have firewall enabled (in my Mac and in my broadband router), but I decided to adopt some kind of protection. I don't want to rise passionate discussions. Real or not, snake oil or not, I need to have back my peace of mind... I read this and this posts. I selected two software that I think that could help me (both have more features other than just an antivirus). Does someone have feedback about Intego's VirusBarrier X6 or Trendmicro's Smart Surfing? Intego solutions seems to be better, but TrendMicro brand/name is stronger in corporate environment, so their solution should be good. Both solutions have 30 day free trial, but I would like to hear something from you. Any other solution that I should look? TIA, Bob

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  • With Ubuntu 9.10, my DVD keeps spinning up

    - by Ken
    I have Ubuntu 9.10 on my Intel Mac Mini. When there's a DVD in the drive, and even if there's no program open at all (just looking at the desktop), every minute or so the disc spins up with a loud whirring noise, and I can hear it cranking the motor to seek across the disc. How do I find out what's causing this? And how can I make it stop? Thanks! EDIT: I straced nautilus, and saw nothing it's doing directly, even when the disc spins up. It does poll inotify regularly, but I don't know how to trace what it's watching, or if that's even how it receives disc-inserted notifications. It doesn't call inotify_add_watch when I insert a disc or mount it (or eject or umount), but it could be watching all of /dev already or something like that. Of course, a DVD is mounted read-only, so whether it's inotify or something else, it should never need to poll anything on that. And if it is inotify, it's happening in the kernel, and the kernel should really never need to poll a device it's mounted to check for notifications.

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