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• How to sync a folder on a remote computer to a server on a domain

  - by Pierre-Alain Vigeant

  We have a small remote office that often share data with us. I learned that the data is shared as a email attachment, but that obviously leads to versioning hell and overriding. I am looking for a way for then to synchronize a folder directly on our main office domain controller. I personally use LiveMesh, but I would like a tool that is synchronized to our server directly without a 3rd party hosting the data, since we already have an online backup service taking care of the offsite backup. What enterprise class tool would let us synchronize a folder from a remote computer that is out of our domain, into our the file server of our domain? The synchronization has to be two-way, e.g.: Someone from the remote office will create an invoice. Someone from our office will review it and make modification to it. The remote office need to see the change. Our server is on Windows 2003.

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• Will I need a dedicated static IP or a unique IP is enough to SSL enable my website?

  - by Devner

  Hi, This is the first time I am dealing with SSL and Dedicated Static IP /Unique IP. Now this webhost says that they will provide Unique IP (not shared with other customers) but do NOT guarantee that it will be static. Now I plan to make my website SSL enabled and install a SSL certificate. So in order to SSL enable my website, will I really need a Dedicated Static IP or will this Unique IP (without the guarantee that it will be static) be enough? What problems will I need to face if the IP is not static? I have already bought hosting from them. And they showed me that option while adding optional services to the account (after I placed my order), so I did not even have a clue about this. Thank you all in advance.

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• $RYSNC_PASSWORD not being read/responded-to correctly (Snow Leopard)

  - by warren

  Ignoring the security issues, I have the following script that synchronizes my music library from my MacBook Pro (running Snow Leopard) to the file store (CentOS 4) on my network: rsync -rav --progress --partial -e "ssh" ~/Music/iTunes/* user@scramasax:~/music/iTunes-scissor:~ When I try to use either a password provided on the command-line (), in a password file (--password-file), or in the environment variable RSYNC_PASSWORD, the login still goes interactive, requiring me to type my password again. I will be moving to pre-shared keys on my network, but in situations where that is not possible, such as rsync'ing files to a webserver, being able to successfully embed the password in the script would be very helpful.

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• Windows printing: printer works locally, but over network it can't find driver

  - by JudahGabriel

  A friend has a Epson Stylus RX500 printer. She wants to share it between her WinXP desktop and her Win7 laptop. The printer is connected direct to her WinXP desktop, and she can print fine from there. But the Win7 laptop can't print -- it can see the shared printer on the network, but it can't find a driver for it. (And looking on the web, I don't see any Win7 drivers for it.) However, if I connect the printer directly to the Win7 laptop, it works, it can print. This suggests that there is a driver for it, but for some reason, it can't find a driver when connecting to the printer over the network. My question is: if a printer works when connected directly to the machine, should it still work over the local network?

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• Experimenting with data to determine value - migration/methods?

  - by TCK

  Hey guys, I have a LOT of data available to me, and want to experiment with data that isn't currently being used in production. The obvious solution seems to be to make a copy of production data and integrate it with what I want to play around with, but I was wondering if there was a better (less expensive?) way to do this. Both isolation and integration are important. I'd like to be able to keep lightweight/experimental data assets apart from high volume production data, but also be able to integrate (RELATIVELY) painlessly if experimental assets are deemed useful. Thanks.

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• MYSQL KEY-VALUE PAIR Viability

  - by Amit

  Hi, I am new to mysql and I am looking for some answers to the follwoing questions: a) Can mysql community server can be leveraged for a key-value pair type database.?? b) Which mysql engine is best suited for a key-value pair type database ?? c) Is Mysql cluster a must for horizontal scaling of key-value based datastore or can it be acheived using MySQL replication?? d) Are there any docs or whitepapers for best practices when implementiing a kv datastore on mysql?? e) Are there any known big implementations other that friendfeed doing kv pair using MYSQL?? Would really appreciate some advise from all you Mysql gurus out there !! Thanks In Advance, Amit

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• VPS DNS Resolution problem

  - by fatnic

  Hi. I've recently moved from a shared hosting to a VPS at vps.net but I think I might have broken it already! I have domain.com and domain.net. I have setup DNS records for both to point to my server. However, only domain.com pings to the correct IP address. domain.net is pointing to a different IP address. Possibly the old server it was pointing to. This has now been deleted. Is there possibly any way to correct this without having to submit a ticket to VPS.net?

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• SELinux Contexts

  - by Josh

  I am configuring Apache\PHP and noticed Apache complaining about permissions with the php shared object. Starting httpd: httpd: Syntax error on line 206 of /etc/httpd/conf/httpd.conf: Cannot load /usr/lib/httpd/modules/libphp5.so into server: /usr/lib/httpd/modules/libphp5.so: cannot restore segment prot after reloc: Permission denied I looked at the context (started fine with enforcement off) and found: [root@HDSSERVER conf]# ls --lcontext /usr/lib/httpd/modules/libphp5.so -rwxr-xr-x 1 root:object_r:httpd_modules_t root root 15565418 May 10 08:39 /usr/lib/httpd/modules/libphp5.so Shouldn't httpd (apache) be able to access files with a context of httpd_modules_t? I got it fixed by applying chcon -t textrel_shlib_t '/usr/lib/httpd/modules/libphp5.so' But I would think the httpd version would work before this one. Can someone explain this to me?

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• Mysql-proxy compile in CentOS

  - by gtfx

  Hey, While trying to compile Mysql-Poxy i get the following error. By the instructions here Libtool library used but `LIBTOOL' is undefined The usual way to define `LIBTOOL' is to add `AC_PROG_LIBTOOL' to `configure.in' and run `aclocal' and `autoconf' again. If `AC_PROG_LIBTOOL' is in `configure.in', make sure its definition is in aclocal's search path Libtool installed from source. Running aclocal get's no error. running ./configure ./configure: line 5821: AC_DISABLE_STATIC: command not found ./configure: line 5823: AC_PROG_LIBTOOL: command not found checking shared library path variable... configure: error: eval "libtool --config | grep ^shlibpath_var" failed Running libtool command libtool --config | grep ^shlibpath_var shlibpath_var=LD_LIBRARY_PATH What am i missing? Thank you for your time.

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• Sharing an external hard drive in Ubuntu using Samba

  - by cambraca

  /media/MYDISK is where my hard drive is mounted automatically. I created a symlink using: ln -s /media/MYDISK /home/camilo/MYDISK chmod 777 /home/camilo/MYDISK I'm setting up smb.conf like this: [myshare1] comment = external disk browsable = yes path = /home/camilo/MYDISK guest ok = yes read only = no create mask = 0775 Also, in the [global] section I tried adding the following lines: follow symlinks = yes wide links = yes unix extensions = no The problem is that when browsing the shared folder in Windows 7, I get a "\\etc\myshare1 is not accessible" error. When pointing the path to a regular folder it works fine. Also, when I point it directly to /media/MYDISK, it shows the same error. EDIT: to make it more interesting, I have no graphical interface, so I need to touch the config files directly..

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• CentOS: safe to yum reinstall after removing 32-bit packages?

  - by virtualeyes

  as per the CentOS FAQ on removing 32-bit packages present in a 64-bit install, is it safe to perform the last step: You may also want to do this: yum reinstall \* The reason is that sometimes the /usr/share/ items (shared between BOTH packages) get removed when removing the 32-bit RPM packages. on an existing installation? (i.e. where data & settings of possibly affected applications need to be preserved) rpm -Va shows a number of entries like: /sbin/ethtool: at least one of file's dependencies has changed since prelinking S.?..... /sbin/ethtool /usr/libexec/mysqld: at least one of file's dependencies has changed since prelinking S.?..... /usr/libexec/mysqld along with /usr/share entries with T flag (apparently filetime diff, seems safe) The machine is up & running fine, but may not be whenever a reboot occurs. Clue-in as to the real state of the machine (hosed or OK) appreciated Thanks

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• MWS2K8R2: Enabling Media Sharing using Streaming Media Services Role

  - by TheLizardKing

  So I have a Microsoft Windows Server 2008 R2 that stores a large collection of media (mostly mp3s) and I want to be able to deliver these files using a server/client setup with Windows Media Player being the client. I downloaded and installed Streaming Media Services Role. I even setup a publishing point with on-demand access. My issue is I can connect using WMP12 but it only connects as more of a stream and not a shared library. I can pause/play/skip as if it's a powerful radio station which is ok in my book but what I'd really like to do is allow me to control my music remotely, search and play for artists, maybe create playlists (not required but nice) and even connect it to an xbox. Is Streaming Media Services Role not what I should be using for this? Would installing WMP and sharing using that mechanism be a better option? Any Ideas?

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• Hadoop on windows server

  - by Luca Martinetti

  Hello, I'm thinking about using hadoop to process large text files on my existing windows 2003 servers (about 10 quad core machines with 16gb of RAM) The questions are: Is there any good tutorial on how to configure an hadoop cluster on windows? What are the requirements? java + cygwin + sshd ? Anything else? HDFS, does it play nice on windows? I'd like to use hadoop in streaming mode. Any advice, tool or trick to develop my own mapper / reducers in c#? What do you use for submitting and monitoring the jobs? Thanks

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• Sending mail to local address crashes web server (sendmail)

  - by deceze

  When trying to send mail automatically from a script at example.com via PHP's mail() to [email protected], the Apache server throws an Internal Error. I believe internally it is configured to use sendmail. The message gets dropped into ~/dead.letter and the general error log reads: [Wed May 12 11:26:45 2010] [error] [client xxx.xxx.xxx.xxx] malformed header from script. Bad header=/home/example/dead.letter... S: /home/example/www/test.php Trying any other address, not @example.com, works just fine. I have googled and serverfaulted for solutions, but they all require to edit configuration files in /etc/mail and similar system places, which is not an option, since this problem occurs on a shared host in which I only have access to ~/. Does anyone have a suggestion?

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• Reset user passwd when you don't know it

  - by warren

  I have a small problem. I have shared keys setup on my domain, so I never type my password to login anymore. I've forgotten my password now. This is a problem because only my user can sudo. Password authentication for root has been disabled, so without my password, I cannot do maintenance on my web server. Is there a way to reset my password as my [now only] key-authenticated user? Specifically, can this be done on CentOS 4?

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• FCGI & recompiling python code without restarting apache.

  - by Zayatzz

  Hello At one hosting company, they used to run python projects with fcgi. They had set it up so that when i changed django.fcgi file, which put django & my project on pythonpath, my project code was instantly recompiled. Because of that a friend set up hosting for our shared project in his server using fastcgi. It has been set up and the python scripts execute as they should, but what we do not know is, how to set it up so that my project would be recompiled when my setup file has been changed. Alan

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• Numlock on when computer is off

  - by George Duckett

  I have a desktop PC which was recently moved. Since moving I've noticed that even while the PC is turned off (but wall socket turned on) the NumLock LED on the keyboard is on. It may have been doing this before the move, but I've only noticed it now. Maybe it matters that the keyboard is connected via a shared mouse/keyboard PS/2 port and I'm running Windows 7. I've not checked whether the LEDs are just keeping whatever state they were in when I turned the PC off but will do this if that information could be relevant. Why does the led stay on when the PC is turned off and how can I prevent this?

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• How can I remove HTTP headers with .htaccess in Apache?

  - by Daniel Magliola

  I have a website that is sending out "cache-control" and "pragma" HTTP headers for PHP requests. I'm not doing that in the code, so I'm assuming it's some kind of Apache configuration, as suggested by this question (you don't really need to go there for this question's context) I don't have anything in my .htaccess files, so it's gotta be in Apache's configuration itself, but I can't access that, this is a shared hosting, I only have FTP access to my website's directory. Is there any way that I can add directives to my .htaccess files that will remove the headers added by the global configuration, or otherwise override the directive so that they're not added in the first place? Thank you very much Daniel

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• Getting clusters of rows close together in time

  - by Mike

  I have a table basically like so ID | ItemID | Start | End | --------------------------------------------------------------- 1 234 10/20/09 8:34:22 10/20/09 8:35:10 2 274 10/20/09 8:35:30 10/20/09 8:36:27 3 272 10/21/09 12:15:00 10/21/09 12:17:00 4 112 10/21/09 12:20:14 10/21/09 12:21:21 5 15 10/21/09 12:22:39 10/21/09 12:24:15 There are two "clusters" of entries here, 1-2 and 3-5 separated by a gap in time, specifically 30 minutes is what I'm interested in. What I would like is the first and last rows of the cluster of entries. This is fairly easy to achieve by retrieving all the rows and looping through them in order of start time, but I'd like to have it in SQL if possible. I'm using SQL Server 2008, thanks.

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• What's the best way to clean up after a fork bomb?

  - by raldi

  $ ls bash: no more processes Uh oh. Looks like someone made a fork bomb. Where I used to work, this pretty much meant that the shared server would need to be power-cycled, since even the sysadmins with root often couldn't get the problem cleaned up. Often, they couldn't even get a prompt. I've heard a few tricks (notably, to send STOP signals rather than KILL signals, since the latter would allow the remaining threads to immediately replace the killed ones), but I've never seen a comprehensive guide entitled So, You Have Yourself a Fork Bomb? Let's make one.

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• ffmpeg add two audio streams to video

  - by Tossin Hausen

  I tried this: ffmpeg -i /sdcard/video/transcode/video.avi -map 0:0,0 -i /sdcard/video/transcode/first.mp3 -map 1:0,1 -i /sdcard/video/transcode/second.mp3 -map 2:0,2 -acodec copy -vcodec py /sdcard/video/transcode/Output.avi to add two audio streams to one video file. But ffmpeg says the number of mappings should match the number of output streams. What is wrong here? I'm trying to work with an Android build of FFmepg "ffmpeg for android beta". "Does not work" means that this uncommunicative Android build of FFmpeg just stops without giving any error message. The -codec copy option does not work with this build. Now I tried the same set of files with the FFmpeg called command line tool that comes with Ubuntu 10. Something (can't say where it is from). The -codec copy option does not work with this FFmpeg too. Here the complete output: m30x:~/movie/Film$ ffmpeg -i input.avi -i first.mp3 -i second.mp3 -map 0 -map 1 -map 2 -acodec copy -vcodec copy output.avi FFmpeg version SVN-r0.5.9-4:0.5.9-0ubuntu0.10.04.1, Copyright (c) 2000-2009 Fabrice Bellard, et al. configuration: --extra-version=4:0.5.9-0ubuntu0.10.04.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --disable-stripping --disable-vhook --enable-runtime-cpudetect --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --enable-shared --disable-static libavutil 49.15. 0 / 49.15. 0 libavcodec 52.20. 1 / 52.20. 1 libavformat 52.31. 0 / 52.31. 0 libavdevice 52. 1. 0 / 52. 1. 0 libavfilter 0. 4. 0 / 0. 4. 0 libswscale 0. 7. 1 / 0. 7. 1 libpostproc 51. 2. 0 / 51. 2. 0 built on Jun 12 2012 16:27:34, gcc: 4.4.3 [NULL @ 0x93cfd10]looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag Seems stream 0 codec frame rate differs from container frame rate: 30000.00 (30000/1) -> 25.00 (25/1) Input #0, avi, from 'input.avi': Duration: 01:30:33.00, start: 0.000000, bitrate: 901 kb/s Stream #0.0: Video: mpeg4, yuv420p, 576x432, 25 tbr, 25 tbn, 30k tbc Input #1, mp3, from 'first.mp3': Duration: 01:30:32.84, start: 0.000000, bitrate: 63 kb/s Stream #1.0: Audio: mp3, 22050 Hz, stereo, s16, 64 kb/s Input #2, mp3, from 'second.mp3': Duration: 01:30:32.84, start: 0.000000, bitrate: 63 kb/s Stream #2.0: Audio: mp3, 22050 Hz, stereo, s16, 64 kb/s Number of stream maps must match number of output streams Merging only one audio stream with the video stream works with Ubuntu and Android version of FFmpeg. Here the complete output: ffmpeg -i input.avi -i first.mp3 -map 0 -map 1 -acodec copy -vcodec copy output.avi FFmpeg version SVN-r0.5.9-4:0.5.9-0ubuntu0.10.04.1, Copyright (c) 2000-2009 Fabrice Bellard, et al. configuration: --extra-version=4:0.5.9-0ubuntu0.10.04.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --disable-stripping --disable-vhook --enable-runtime-cpudetect --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --enable-shared --disable-static libavutil 49.15. 0 / 49.15. 0 libavcodec 52.20. 1 / 52.20. 1 libavformat 52.31. 0 / 52.31. 0 libavdevice 52. 1. 0 / 52. 1. 0 libavfilter 0. 4. 0 / 0. 4. 0 libswscale 0. 7. 1 / 0. 7. 1 libpostproc 51. 2. 0 / 51. 2. 0 built on Jun 12 2012 16:27:34, gcc: 4.4.3 [NULL @ 0x9bfad10]looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag Seems stream 0 codec frame rate differs from container frame rate: 30000.00 (30000/1) -> 25.00 (25/1) Input #0, avi, from 'input.avi': Duration: 01:30:33.00, start: 0.000000, bitrate: 901 kb/s Stream #0.0: Video: mpeg4, yuv420p, 576x432, 25 tbr, 25 tbn, 30k tbc Input #1, mp3, from 'first.mp3': Duration: 01:30:32.84, start: 0.000000, bitrate: 63 kb/s Stream #1.0: Audio: mp3, 22050 Hz, stereo, s16, 64 kb/s Output #0, avi, to 'output.avi': Stream #0.0: Video: mpeg4, yuv420p, 576x432, q=2-31, 90k tbn, 25 tbc Stream #0.1: Audio: libmp3lame, 22050 Hz, stereo, s16, 64 kb/s Stream mapping: Stream #0.0 -> #0.0 Stream #1.0 -> #0.1 Press [q] to stop encoding frame= 6157 fps=6156 q=-1.0 size= 31667kB time=246.28 bitrate=1053.3kbits/s Do you have an idea why it does not work with two audio streams? By the way, ffmpeg -i input_with_first_audio_stream.avi -i second.mp3 -acodec copy -vcodec copy output_two_audio_streams.avi -newaudio works with both versions of ffmpeg that I use, but the first audio stream is played too fast (x10 or more), while the second audio stream is played correct. Many thanks in advance and sorry for my unconventional question and outdated versions of ffmpeg. But I am a lamer and it is not so easy for me to compile from the source (especially for the Android version). I will try to compile an up to date version of ffmpeg with Ubuntu, but I don't have much free time.

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• Essential skills of a Data Scientist

  - by harshsinghal

  I would like to know more about the relevant skills in the arsenal of a Data Scientist, and with new technologies coming in every day, how one picks and chooses the essentials. A few ideas germane to this discussion: Knowing SQL and the use of a DB such as MySQL, PostgreSQL was great till the advent of NoSql and non-relational databases. MongoDB, CouchDB etc. are becoming popular to work with web-scale data. Knowing a stats tool like R is enough for analysis, but to create applications one may need to add Java, Python, and such others to the list. Data now comes in the form of text, urls, multi-media to name a few, and there are different paradigms associated with their manipulation. What about cluster computing, parallel computing, the cloud, Amazon EC2, Hadoop ? OLS Regression now has Artificial Neural Networks, Random Forests and other relatively exotic machine learning/data mining algos. for company Thoughts?

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• Does anyone know a better alternative to MS Excel's Solver?

  - by tundal45

  My company has to crunch a lot of data and part of the process involves running the solver and plotting a graph through resulting data points. Obviously there is a lot of copy and paste involved and the whole process is shaky, error prone and all round cluster-fudge. I was wondering if there was an alternative to the solver that can be used so that even if we have to use excel to plot the final graph, there will be a lot less data that needs to be copied and pasted back and forth. It would be great especially if the tool could be easily integrated into a .NET application but I am open to suggestions that may require a little bit of code-fu to get this to work. Thanks!

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• Setup Windows Media Player 11 to stream from TVersity

  - by snorfys

  I've got TVersity installed on a Windows 2003 server box (work had an extra license that they donated to let me install at home to get some practice setting up/administering a domain etc.) I found out that Windows Media Player 11 won't install on Windows 2003, but installed TVersity instead and streaming to my 360 is working great. Problem is that I don't know how to setup streaming to any other PC on the network. All of the PCs have access to the shared network folder, but playing from there doesn't stream and the stutter is pretty bad. Is there a way to setup Windows Media Player 11 or another player to stream from TVersity?

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• Clojure / HBase: How to Import HBaseTestingUtility in v0.94.6.1

  - by David Williams

  In Clojure, if I want to start a test cluster using the hbase testing utility, I have to annotate my dependencies with: [org.apache.hbase/hbase "0.92.2" :classifier "tests" :scope "test"] First of all, I have no idea what this means. According to leiningens sample project.clj ;; Dependencies are listed as [group-id/name version]; in addition ;; to keywords supported by Pomegranate, you can use :native-prefix ;; to specify a prefix. This prefix is used to extract natives in ;; jars that don't adhere to the default "<os>/<arch>/" layout that ;; Leiningen expects. Question 1: What does that mean? Question 2: If I upgrade the version: [org.apache.hbase/hbase "0.94.6.1" :classifier "tests" :scope "test"] Then I receive a ClassNotFoundException Exception in thread "main" java.lang.ClassNotFoundException: org.apache.hadoop.hbase.HBaseConfiguration Whats going on here and how do I fix it?

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