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• Raspberry Pi based Hadoop cluster

  - by Dmitriy Sukharev

  Is it at least possible to build Hadoop cluster from Raspberry Pi-based nodes? Can such a cluster meet hardware requirements of Hadoop? And if so, how much Raspberry Pi nodes are required to meet requirements? I understand that a cluster from several Raspberry Pi nodes being cheap is not powerful. My purpose is to organize cluster without possibility of loosing personal data from my desktop or notebook, and to use this cluster studying Hadoop. I'd appreciate if you suggest any better ideas of organizing a cheap Hadoop cluster for studying purposes. UPD: I've seen that recommended amount of memory for Hadoop is 16-24GB, multi-core processors, and 1TB of HDD, but it doesn't look like minimal requirements.

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• How to install libcrypt-ssleay-perl in Ubuntu?

  - by Deqing

  When I tried to install libcrypt-ssleay-perl, it says: $ sudo apt-get install libcrypt-ssleay-perl Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: libcrypt-ssleay-perl : Depends: perlapi-5.12.4 but it is not installable E: Unable to correct problems, you have held broken packages. This perlapi-5.12.4 is actually a virtual package provided by perl-base, which I had already installed: $ dpkg -l|grep perl-base ii perl-base 5.14.2-6ubuntu2.1 minimal Perl system So what should I do to install libcrypt-ssleay-perl now?

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• Munin help... configure graphs to show different time periods

  - by PiZzL3

  I'm running a server with Munin installed through WHM cPanel. I've been googling around and I can't seem to find out how to do the following: A: Change a graph to show a different time period (currently I can only view, day, week, month, year). I would like to possibly view per minute, per hour... or specific intervals such as per 30 minutes, per 4 hours, etc... B(optional, but preferred): Add new graphs with the above criteria(A) above. I am a novice with all things that will possibly be required to do this (such as ssh). I wish I could just go edit a php file as I'm highly experienced in that subject. Thanks for any help!

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• On windows commandline, how do I get a dynamic prompt that tells me where in the filesystem I am?

  - by guneysus

  I am trying to modify my CMD, to show only current dir name dynamically like: Desktop $ When i switched the folder, it must be updated. It is not required to be code in purely batch file, it may depend any external commands, cygwin bash, etc. @echo off set a=bash -c "pwd | sed 's,^\(.*/\)\?\([^/]*\),\2,'" %a% cmd outputs _test-et Microsoft Windows [Version 6.3.9600] (c) 2013 Microsoft Corporation. Tüm haklari saklidir. >> But >> prompt %a% gives bash -c "pwd | sed 's,^\(.*/\)\?\([^/]*\),\2,'"

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• Windows updates behind a physical firewall with only IP based rules and generic outbound connections are turned off

  - by user125245

  I have some boxes that I do not want to allow any in or outbound traffic to the internet Except for windows updates. However the fire wall in place (Cisco ASA) apparently only supports ip based rules. As best I can tell access to Microsoft updates via anything other then the half dozen URL masks the Microsoft lists as needed does not appear possible. I have kicked around building a full WSUS that I would then manually copy the update files to so that no direct Microsoft access is needed but this sounds very top heavy for the very few boxes involved. I have also kicked around manual updates all around but am not certain how to be conveniently and confidently sure that the correct updates are being applied in the correct order. Any ideas from any direction would be appreciated. I want this as simple / cost effective as possible but have very little flexibility on the only absolutely required internet access policy.

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• Confusion about DNS for mail server

  - by Tyron Gower

  We have migrated to Office365, everything is working except one company cannot email us as its connecting to our subdomains email server. So, We have companionsoftware.com.au hosted through office365 and all the required DNS entries. All seems to be working fine. We then have a web server hosting our website companionsoftware.com.au and our subdomain email attachments.companionsoftware.com.au (pop3/smtp). now for this one company when they try and email [email protected] it's connecting to STMP on attachments.companionsoftware.com.au. Now attachments.companionsoftware.com.au and companionsoftware.com.au have the same ip address, but this is only affecting one person (that we know of) when they try and email us. Have i configured something wrong or is it their server?

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• MDT Image Hierarchy

  - by Antix

  Just a quick question, I couldn't find this out by looking around and have not had the time to run a test myself: Is it possible to create image hierarchies in MDT? Take this example where we have three images. - Image 1: Base OS - Image 2: Company Wide Applications (built off Image 1) - Image 3: Specific Role Applications (built off Image 2) Now just say we change the version of an application in Image 2. The next time we build Image 3, will this take the new version of the application since it's basing its image off Image 2? Also, If we add a program to Image 1, leave Image 2 unchanged and re-build Image 3, would this include the new program? I'm trying to plan out a way of creating images such that if a change is required for an image that is on basically every machine (think, Image 1) then we only have to change it in one location. Has anyone actually done something like this and has any tips?

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• Can Visual Studio track the "size" or "severity" of my changes in TFS?

  - by anaximander

  I'm working on a sizeable project using VS2012 and TFS (also 2012, I think - I didn't set up the server). A lot of my recent tasks have required making very small changes to a lot of files, so I'm quite used to seeing a lot of items in my Pending Changes list. Is there a way to have VS and/or TFS track how much has been changed and let me know when the differences are becoming significant? Similarly, is there a way to quickly highlight where the major changes are when you get the latest version from TFS? It'd really help with tracking down where certain changes have been made without having to go through and compare every file - the difference highlighting tool might be nice, but when you have to use it on a dozen files to find the block you're looking for, you start to wonder if there's a faster way...

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• What is the reason for: "Depends: libatk1.0-0 (>= 1.29.3) but 1.28.0-0ubuntu1 is to be installed"

  - by solomongaby

  I am trying to install Filezilla from this repository: https://launchpad.net/~yofel/+archive/ppa And after sudo apt-get update, I tried to install it but I get this error: Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: filezilla: Depends: libatk1.0-0 (>= 1.29.3) but 1.28.0-0ubuntu1 is to be installed Do you have any idea what is happening?

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• re-direct SSL pages using header statement based on port

  - by bob's your brother

  I found this in the header.php file of a e-commerce site. Is this better done in a .htaccess file. Also what would happen to any post parameters that get caught in the header statement. // flip between secure and non-secure pages $uri = $_SERVER['REQUEST_URI']; // move to secure SSL pages if required if (substr($uri,1,12) == "registration") { if($_SERVER['SERVER_PORT'] != 443) { header("HTTP/1.1 301 Moved Permanently"); header("Location: https://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']); exit(); } } // otherwise us regular non-SSL pages else { if($_SERVER['SERVER_PORT'] == 443) { header("HTTP/1.1 301 Moved Permanently"); header("Location: http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']); exit(); } }

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• What's the easiest way to upgrade a single laptop hard drive?

  - by rutherford

  My HD is coming near the end of it's life and I wondered if producing an image of the original was all that was required? What's the best software to use for this and how can I accomplish it - can I use my other laptop for the image file or do I need to buy an external HD to accomplish the clone? Does having several partitions of both FAT32 and NTFS with partition magic installed affect things at all? Is it just a matter of making the image, swapping in the new HD and copying the image to that?

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• How to setup Apache 2.2 (prefork) with mod_fcgid to test a C++ application?

  - by skyeagle

  I have written my first fastcgi application (C/C++), and I need to test it to ensure that it is behaving the way I expect it to. I have searched for examples on setting up Apache 2.2. with mod_fcgid, but all of teh tutorials etc I have seen, relate to PHP, Python, Perl etc. Is anyone aware of a resource that shows how I may setup Apache to use mod_fcgid (NOT mod_fastcgi) to test my binary? If no online resource is available (I'd be surprised), then could someone please point out the steps required to do the testing?

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• Can Camel Jetty proxy URL share the webapplication context

  - by user1750353

  I am struggling with Camel Jetty Proxy Routes. At times, the routes exhibits inconsistent behavior. My Proxy app deployed with context root "Proxy", however, if give that as the context path for my proxy URL I get service not found error. If change the Proxy to an arbitrary context such as "Dummy" then the route works. Is that how camel jetty component works? From Path: jetty:http://0.0.0.0:6080/Proxy/PurchaseOrder/?matchOnUriPrefix=true&disableStreamCache=true&traceEnabled=true To Path: jetty:http://localhost:7001/Provider/PurchaseOrder/?bridgeEndpoint=true&throwExceptionOnFailure=false Another issue i noticed with jetty is If deploy both Proxy and Provider on the same app container(same listening port), then the route completely stops working saying "Provider/PurchaseOrder/" service not found. The only way the routes work is, both routes have to run different ports and the from route shouldn't share the webcontext path. I have requirement that if required I should be a able run both Proxy and Provider on the same container. Any help appreciated. Thanks,

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• How to Configure SSL on Particular Folder,Not overall Site in iis 7

  - by user66001

  I have a website for example www.somesite.com. I want to apply SSL settings on Particular Folder in this site. I followed following steps. (1) Import Certificate in IIS 7. (2) Create SSL Bindings. (3) Select folder in website and set required ssl. Now my problem is that I want one particular folder to require SSL not overall site. By Following above steps. I can browse whole site with both http and https. I want whole site to be browsed by only http and the particular folder in website to be browsed using only https. Like -http://www.somesite.com and -https://www.somesite.com/somefolder Thanks in advance.

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• computer reboots randomly, can't find ssd

  - by John Barry

  My comp's been restarting at random times, and when it comes back the SSD drive can't be found by the BIOS and it doesn't boot. Powering down and starting up again fixes it 90% of the time, with a second reboot occasionally required. Does not seem to be heat related; it's never happened with me actually on the computer. It has happened while acting as the squeezebox server, however. It's a Sandy-Bridge i7 arch if that helps. To add: I've also run Windows Memtest and it came back with no issues.

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• Can an UPS be too powerful?

  - by Andy

  Our old network admin bought the top range UPS a few months ago but never came around to setting it up and is no longer with the company. Now the old UPS broke down and needs to be replaced, but an external company that did an audit said that that UPS won't work. Now we are no hardware specialists, but the difference in specs is a higher output from 5A to 8.8A meaning a higher output. But isn't the UPS supposed to give the server the required output anyway? This 'independent' audit does sell its own hardware including UPSes so I'm not sure how much bias they have. Is there a reason why we can't replace the old broken UPS with the new more powerful one? Is there a way we can check to see if the UPS works with our server? ok, i wrote down the numbers again, the Volts and Amps are what are on the back (where you connect up the plugs which seem diffrent from on the front label.) old one APC SmartUPS 1500 220-240V -- 6.8A new one Dell UPS 1920W 250V -- 10A

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• Get-Mailbox not returning all mailboxes

  - by rotard

  I am trying to set up an exchange mailbox backup job with Vembu Storegrid and StoreGrid is unable to list the mailboxes for the client. While I was troubleshooting the issue, I did notice another thing: running the Get-Mailbox command on the mail server as the backup user only shows the mailbox for that account, while running Get-Mailbox as my admin account returns a list of what appears to be all the mailboxes. My service account is a member of "Administrators", "Domain Admins", and "Domain Users". What additional permissions might be required to list all mailboxes in the system?

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• Bringing Google Docs to the Desktop

  - by Jonathan Sampson

  Is there a stable way of accessing Google Docs (application) from my desktop without having to use a browser on Windows? On my accepted answer... While I did stipulate that I wanted to not use my browser, I didn't really mean I wanted to avoid browser technology. I meant I didn't want to open my browser, type in the web address for google docs, etc. TheTXI's answer required me to download/install nothing more than what I already had (Chrome) to acheive this. It created a desktop icon (similar to an application) that launches me right into my docs (similar to an application), without extra browser-items on the screen. This was an excellent suggestion, and won by virtue of parsimony.

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• Losing file permissions after rebooting Windows 7

  - by SMTF

  I have a User directory full of files that are not accessible permission wise for the user who's home directory it is. Said user can't run Explorer. For example, it provides an error complaining that permission is not available for required files. I tried various ways to give said user permission of his home directory and things are fine until after rebooting the machine; the permissions reset to the previous state and the problem persists. I followed the solution outlined here. And again things worked until I reboot the machine. I'm in this mess because I replaced a corrupted user profile as outlined here. The original user and the new replacement on are/where both admin accounts. In case it is relevant I will mention that the Users directory is not on the C volume but a D volume on the same machine. Any insight is appreciated.

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• "Permission denied (publickey)" error when ssh'ing to Amazon EC2 Debian AMI 05f3ef71

  - by user193537

  I have launched a Debian system using AMI 05f3ef71 in Amazon EC2, but I have no lock connecting to it using SSH as suggested in "Connecting to Your Linux/UNIX Instances Using SSH". I tried several user names: ec2-user, root, debian... None of them worked. I always get a Permission denied (publickey) error message. Using ec2-get-console-output instance_id as suggested doesn't work either, it requires option "-K". If I supply it, I get the error message Required option '-C, --cert CERT' missing, but I have no idea what to supply there. Port 22 is opened on the affected instance. Does anyone have an idea what I could try to log in to my instance?

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• Laptop wont start after BIOS update

  - by Maven

  I have a HP Probook 4540s i recently update its BIOS from HP's site after the installation the notebook re started but since after that there is no display i waited for an hour until the battery ran off after when i plugged in its same: Capslock is contunously blinking Fan is running faster than the usual speed i can tell this from the sound And no display i waited for more than hour for any response but no gain. Searched Internet and find out that alot people fails to update their BIOS in HP laptop i dont know why official HP sites has such updates even avaialble. Is there a way i can reset the BIOS, Hard reset, through USB of something i have another PC over which i can download anything if its required? Can anyone please help.

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• Solaris 10: Identify a PID and the CPU it's running on

  - by Marcus

  I have multiple instances of a database running on a Solaris system. I'd like to prove that each database process is being handled by a different CPU. Essentially, I want to be able to do something like a ps -ef | grep <process_name> to get the PIDs and then run another command (if required) to identify the CPU... Is prstat able to do this? I'm making an assumption that as each database instance is started each one uses a different CPU. I'm not sure if I'm understanding this correctly... The reason I want to do this is because Sun hardware has slow CPU's, but lots of them. Therefore, to get the best performance out of it, I need to try and spread the load among CPU's... Thanks

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• Solaris 10: Identify a PID and the CPU it's running on

  - by Marcus

  I have multiple instances of a database running on a Solaris system. I'd like to prove that each database process is being handled by a different CPU. Essentially, I want to be able to do something like a ps -ef | grep <process_name> to get the PIDs and then run another command (if required) to identify the CPU... Is prstat able to do this? I'm making an assumption that as each database instance is started each one uses a different CPU. I'm not sure if I'm understanding this correctly... The reason I want to do this is because Sun hardware has slow CPU's, but lots of them. Therefore, to get the best performance out of it, I need to try and spread the load among CPU's... Thanks

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• Does CHECK TABLE add read/write locks?

  - by Ztyx

  Hi, Yesterday I ran CHECK TABLE on a table that is read very frequently. I scanned the MySQL documentation for CHECK TABLE for any mentions of "lock" (and found none) and also noticed that only SELECT privilege was required to run the command. I therefor concluded that the command did not do any read lock and was safe to run even in production. Sadly, running the command took 1 minute and 37 seconds and seemed to block all read access. My question is therefor, does CHECK TABLE do any read lock? Any other reason why I experienced a read block on the table? Thanks

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• How can I synchronise my Outlook Calendar with Google Calendar (preferably using a free/open source tool)?

  - by Kuf

  How can I synchronise my desktop Outlook calendar with my Google Calendar (Outlook - Google)? I saw the question Free tool for Synchronizing Google Contacts and Calendar with Outlook, but the solution that was suggested there is no longer available - Google Sync End of Life. There are tools that required a payment, like SyncMyCal, gSyncit and OggSync, but I am looking for a free / open source solution. One can download Google sync, but when trying to use it there's an error: For now, I use OggSync to synchronise, but as a freeware it allows to synchronise manually only, not automatically, so I have to remember to synchronise after every change. I checked Mozilla Sunbird, but I couldn't find any relative posts on how to synchronise Outlook - Google using it. Just to be clear: I'm not looking for software; I am looking for a solution. What can I do if sometimes software is a solution?

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