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• Configuring memcached for a particular scenario

  - by pradeepchhetri

  I have a web application which queries opentsdb server(which in backend using Hbase cluster) for the datapoints of different metrics and using dygraph javascript graphing library, I am plotting those metrics. Since getting all the datapoints of past one day from opentsdb for a particular metric is itself taking nearly 2 seconds, my application which is plotting nearly 25 metrics is becoming very slow. In order to reduce this latency, I am thinking of using memcached module of php5 for caching all the queries. But I have few questions regarding memcached. Is there any way I can configure memcache to keep on updating its cache in the background by running some command line queries after particular interval of time. Is there any way I can configure memcache to always reply for a query using cache instead of first updating its cache because my application just plots datapoints for past one day. Missing out some datapoints is not that critical.

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• Building a network at home, what cables to use (if any)?

  - by Faruz

  My house is currently in ruins and am building it. While doing so, I wanted to design a home network. My main objectives are surfing and HD streaming. The house is one-level, 100 sq/m (about 300 sq/ft), and one of the rooms is a safety room with Reinforced concrete walls. About a year ago, when I started planning, I thought about putting Cat 6 STP cables in the walls and create network points in the rooms. Should I use STP or FTP? I heard that STP is a problem regarding connectors and stuff. Is it really beneficial? Will it work OK if I transfer the wire together with the telephone line? Should I maybe go with WLan and count on 802.11n to enable me to stream HD across the house? is 802.11n that good?

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• Virtualise Excel in a browser

  - by Macros

  Is it possible to give users access to a virtualised instance of Excel - I don't want to give them access to a full OS (although this will clearly be running in the background, all they can access is Excel - they don't even see any other screens)? Secondly, if it is possible, is it possible to do within a browser? Edit I am building a system which is designed to test candidates skills in Excel and for this reason needs to use the full desktop version and not a web app. I don't want to have to ensure Excel is installed on the client machine as there will be issues around differing versions and security as the workbook(s) that are used in the test use VBA extensively to customise and mark the exercises. Ideally my web app would be able to open a session to the server which then just puts the user into an instance of Excel without ever seeing a desktop. I would also need to be able to pass in command line parameters in order to define which workbook to open and also pass in a unique token to identify the user

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• mysql -e option with variable data - Pass the variable value to insert sql statement in shell script

  - by Ahn

  The following shell script is not inserting the data to the table. How to pass the variable value to insert sql statement in a shell script. id=0 while true do id=`expr $id + 1`; mysql -u root -ptest --socket=/data/mysql1/mysql.sock -e 'insert into mytest1.mytable2(id,name) values (' $id ',"testing");' echo $id >> id.txt done I have modified the script as below and tried, and still having the issue id=0 while true do id=`expr $id + 1`; # mysql -u root -ptest --socket=/data/mysql1/mysql.sock1 -e 'insert into mytest1.mytable1(name) values ("amma");' mysql -u root -ptest --socket=/data/mysql1/mysql.sock -e 'insert into mytest1.mytable2(id,name) values ( $id ,"testing");' echo $id >> id.txt done error : ]$ ./insert ERROR 1054 (42S22) at line 1: Unknown column '$id' in 'field list'

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• Problem with php and apache

  - by user47587

  I am having trouble using the php module with apache2. At the moment, testing with a phpinfo script, only php code is displayed as though it were text, no output at all. I have the line LoadModule php5_module libphp5.so, with an absolute path. Yet, when I do apache2 -t -D DUMP_MODULES |grep php, nothing is reported I have my error level set to warn, and the last entry in my logfile after apache starts is [notice] Apache/2.2.15 (Unix) PHP/5.2.12 mod_ssl/2.2.15 OpenSSL/0.9.8g configured -- resuming normal operations Which implies there is php support?

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• Postfix not delivering mails

  - by Sotocan

  Hi all, I have problems with a recently configured postfix MTA. When postfix starts the following warning appears: "postfix/qmgr[5078]: warning: connect to transport private/filter: No such file or directory" I have amavis-new as a content-filter, but even if I comment-out the relevant line, the warning appears. As a result (I think), of the above, I get errors like below, for every virtual domain that I have: "postfix/error[5080]: 254851834107: to=, relay=none, delay=13082, delays=13082/0.01/0/0.01, dsn=4.3.0, status=deferred (mail transport unavailable)" The good news for me, is that somehow I managed to fix that (don't ask me how!!!!) The problem is that now I have 50 or so mails, that were affected by the aforementioned problem, in the mail-queue... If I "postqueue -f " I get the same style of error as before (mail transport unavailable)...however new mails are delivered to their final destination properly... Any suggestions? Kind regards. P.S. Local mail delivery from/to Unix and virtual users, was OK write from the beginning!

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• Broadband Traffic Question

  - by rutherford

  I have a broadband ADSL line with plus.net in the UK. Having checked the modem there is no firewall or any weird features enabled. But since I arrived at the apartment (the broadband already being installed), I cannot log into Twitter nor update any of my wordpress blogs (I can browse them and log in, but cannot save any edits or new posts). It only seems to affect these two sites in their unique ways. If I take the netbook I use in this place out to say a McDonalds or some other wifi access point then these sites work fine again. Anyone know what could possibly be preventing access of the pages in question? The only thing common to these pages are the POST response they are expecting. But POST form submission works fine on other sites...

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• How to install software packages on a Mac? (MacPorts, Fink, anything better?)

  - by Ben Alpert

  On my Mac OS X machine, how would you recommend I install command line software and other packages? I've been using MacPorts and it always seems quite slow, presumably because it has to compile the packages on-the-fly. I'd much prefer a package management system that has binary packages, saving me the need to compile things every time I want to download something new. I think Fink has binaries for some of the packages, but I usually see MacPorts recommended as the system to use. Which do you think works better and why? (Or is there another system that I haven't heard of?)

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• grub2 error: out of disk

  - by Carl Smotricz

  I'm trying to make a 250G USB hard disk Ubuntu-bootable on a Compaq nc6220 laptop. I've removed all other disks, so /dev/sda (the USB disk) is the only disk other than CDROM. I installed Ubuntu 9.10 to this disk from the live CD, putting the bootloader on /dev/sda . The default system couldn't be booted, and nothing I did in the Grub menu/cmdline helped. So I chrooted onto the disk and did grub-install /dev/sda. That seemed to work fine, but Grub (1.97 beta 4) keeps coming up with error: out of disk Even when I drop to the command line to do something simple like ls or help, it's always the same error message. Any hints for resolving this, please?

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• Shortcut key to skip cursor from left/right of every typed word

  - by user176368

  I want to know if it is even possible to jump my cursor from left/right of every typed word using Vimperator, a Firefox addon that behaves like Vim, including its shortcut keys. So a good example would be: I took a marvelous dump right before bed and I so happen to sleep better.- Now if my cursor is at the end of that sentence (hence the dash) how can I jump my cursor right before the word better by just using a shortcut key? by default Ctrl+A & Ctrl+E are shortcut keys that brings your cursor to beginning/end of the current line your on.

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• Using socat to exec php cli

  - by RoyHB

  There are multiple client programs that periodically connect to a port on my server and send a single line of text. When a connection to the port is made I need to start a PHP CLI script that processes the data. There may be many of the remote scripts running/connecting at more or less the same time so I think it would be best if socat forked a process for each connection to run the script. I've gotten socat to do most of what I need, using the command socat tcp-l:myport,fork exec:mypath/socatTest.php I can read the input on php://stdIn. All is good. The problem is that the process doesn't seem to fork, so if a second external program sends data while another is doing the same it gets a connection refused error. Where have I gone wrong?

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• phpmyadmin error #2002 cannot connect to mysql server

  - by Joe

  so i am getting this error when trying to connect to my mysql server. i have reinstalled MYSQL and php several times and tried a slew of command line work from info around the web.mysql is running and i know that my mysql.sock exists and is located in ~/private/tmp/ and also in ~/tmp/. i also have plenty of hard drive space. i have installed and setup phpmyadmin correctly only adding a password to 'Password for config auth'. AND i have connected to the server via Sequel Pro. so my question is what the heck is going on that i can't connect to the server via phpmyadmin? any guesses? also i'm on a 64-bit intel mac running snow leopard

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• Encoding with FFmpeg using a FIFO

  - by Ashot Martirosyan

  Hello everyone. I'm trying to convert Flac audio file to AAC file using command line. So I wrote this ffmpeg -i input.flac temp.wav faac -q 120 -o output.m4a temp.wav It's working fine. Now I want to do the same using fifo, so I'm writing this mkfifo temp.wav ffmpeg -i input.flac temp.wav & faac -q 120 -o output.m4a temp.wav And it's freezing. So could you tall me what I'm doing wrong. Thanks a lot, and sorry for my English.

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• smarter OS X smart folder

  - by vectorizor

  Hi all, Smart folders on OS X are nice and all, but you can only access them from the Finder sidebar, and nowhere else (or am I wrong?). A better way would for them to appear as normal folder in the file system, so they are available from anywhere, say cmd line for isntance. Or if you have a smart folder to find movies/music in ~/Download, and add a shortcut to it in ~/movies, you could see your music/movies from Front Row). THe smart folder wouldnt have to be refreshed immediatly, maybe every hours or so from a cron/launchd job. Any way to do that? A

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• Hiding a directory through the FAT table

  - by hennobal

  I've looked into the FAT file system, trying to find a way to make a directory hidden from view of the user. This has been done with malware previously, so it should be possible. The SpyEye trojan hid inside a directory C:\cleansweep.exe\ which was only reachable through the command line. I know deletion is possible by substituting the first character of the directory in the FAT table with 0xE5, but then it will not be accessible. Any ideas on how the scenario from SpyEye can be recreated? Any filesystem is interesting, but ideally FAT or NTFS.

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• setup vim so that it searches the python path

  - by Dave

  I'm using vim as my primary editor with python files; I'd like to be able to easily open python files. As an example: I'm looking at a particular module A.py, in it I see the line import funkyModule, I want to edit that module so I just type in the command :pyed funkyModule and the pyed vim-command automatically finds the file funkyModule.py (or funkyModule/__init__.py) where ever it occurs on the python path. This capability is modeled on the capabilities if the ipython shell, where In [#]: edit funkyModule does what I've just described.

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• I can't see wordpress .php file?

  - by Alegro

  I installed WAMP server on win xp - it works. I installed Wordpress 3.4.2 into www.wordpress - no problem. In Dreamweaver CS5 I created a site with www.wordpress as root folder, and assigned a local test server - ok. In Dreamweaver, I opened twentyten theme - index.php - and pressed F12 to see the page in Firefox - and got: Fatal error: Call to undefined function get_header()... - on line 16 This is a completely new and clear wordpress installation. Why is the function (get_header) - undefined? To check the server I copied another .php file into the same folder - F12 - it works.

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• How do you interpret `strace` on an apache process returning `restart_syscall`?

  - by indiehacker

  We restart an apache server every day because RAM usage reaches its limit. Though of value See this serverfault answer, I dont think lowering the MaxClients in the apache configuration is a solution to the unknown root problem. Can you make sense out of the below data? Below is an extract of what $top with M returns: 20839 www-data 20 0 1008m 359m 22m S 4 4.8 1:52.61 apache2 20844 www-data 20 0 1008m 358m 22m S 1 4.8 1:51.85 apache2 20842 www-data 20 0 1008m 356m 22m S 1 4.8 1:54.60 apache2 20845 www-data 20 0 944m 353m 22m S 0 4.7 1:51.80 apache2 and then investigating a single process with $sudo strace -p 20839 returns only this one line, which is cryptic, for me: restart_syscall(<... resuming interrupted call ...> <unfinished ...> Any insights? Thanks.

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• rss downloader script

  - by The Digital Ninja

  I have a Synology NAS that is powered by linux at my house. I'm looking to set up a cron script to check a group of rss feeds and auto download new video podcasts to a shared folder. I can do most of the scripting, such as deleting files older than 3 weeks and the wget parts. But I'm not sure how to parse the rss feed and check dates to only grab the latest. I figured its best not to re-invent the wheel and surly someone out there has a command line rss downloader or some such script. Any ideas?

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• Running 'dd' command at startup?

  - by Usman Ajmal

  Hi, I have set a script to run at Linux startup. The script contains a following line of code dd if=/dev/sda2 of=/dev/sda5 ?> result.txt Now, when my Linux Desktop appear, result.txt contain dd: opening '/dev/sda2': Permission denied If I prefix the dd command with sudo as: sudo dd if=/dev/sda2 of=/dev/sda5 ?> result.txt the result.txt contains sudo: no tty present and no askpass program specified Is there a way I can get around this problem? What I want is to copy 2nd parititon to 5th when a user logs in no matter if he is root, admin, Desktop or an unprivileged user. Thanks a lot as always.

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• solaris + match the network device name according to IP address

  - by yael

  how to find the device name as ( e1000g2 , e1000g3 , etc ) according to his IP address on Solaris machine for example ifconfig -a | grep 10.106.134.133 inet 10.106.134.133 netmask ffffff00 broadcast 10.106.134.255 ifconfig with grep command view only the line with the IP address , and the device name appears before the IP address so my target is to match the device name according to the IP address on Solaris machine , and then insert the device name in to parameter ( ksh ) please advice? full example: from ifconfig -a ( I get the IP and device name , what I need is to find the device name according to IP address , and insert the device name in to parameter ) e1000g2: flags=201000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4,CoS> mtu 1500 inet 10.106.134.133 netmask ffffff00 broadcast 10.106.134.255

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• is there a cheatsheet for linux commands to save your system?

  - by Asaf

  I've recently lost my window options, had to somehow manipulate my way to Xchat and ask some people how do I get it back (it was metacity --replace, and after I decided to stop the command and run it in background the X was completely useless so I had to do killall -u user). And that was after the internet connection stopped working for some reason (might've been the ISP) ..The thing is, after using linux a long time, I still get the feeling that on dire situations, I don't know the good tricks (stuff like metacity --replace) I feel like a really need like a "rescue" cheatsheet for things like "how to save the X no matter what without pressing reset" and "how to reset the system to "normal state"" "how to connect to the internet through the command line" "how to monitor what the X is doing" (using ubuntu linux 10.04 btw)

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• Utility to listen on port (Windows 2003 Server)

  - by Gero

  Hi, I need to validate some network connectivity from machine X to a Windows 2003 Server machine. To be able to do so I'm looking for a simple utility that I can run on the Windows 2003 server that will listen on a specified port. It does not have to do anything else. When it listens on the specified port I can do a telnet to that port from machine X and check if all firewalls are open. The Windows 2003 Server machine is already a production machine so I cannot install all kinds of stuff. At this stage we want to ensure that all network connectivity is in place before we do the installation of the 'real' application that will listen that port (don't want to wast time debugging network connectivity issues when we do the actual deployment of the new application. The utility should be a simple command line utility that does not require any installation. What utilities do you recommend? Thanks, Gero

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• How to download a URL as a file?

  - by Michelle

  A website URL has "hidden" some MP3 files by embedding them as Shockwave files, as follows. <span class="caption"><!-- Odeo player --><embed src="http://odeo.com/flash/audio_player_tiny_gray.swf"quality="high" name="audio_player_tiny_gray" align="middle" allowScriptAccess="always" wmode="transparent" type="application/x-shockwave-flash" flashvars="valid_sample_rate=true external_url=http://podcast.cbc.ca/mp3/sundayeditionstream_20081125_9524.mp3" pluginspage="http://www.macromedia.com/go/getflashplayer"></embed></span> How can I download the files for off-line listening? I've found two methods: 1. The Stack Overflow Method Create a new local HTML file with just the links, for example: <a href="http://podcast.cbc.ca/mp3/sundayeditionstream_20081125_9524.mp3">Sunday Edition 25Nov2008</a> Open the file in the browser, right click the link and File Save Link As. 2. The Super User Method Install the Firefox addin Iget. (Be sure to use the right version for your Firefox version.) Tools Downloads Enter URL in the field. Are there any other ways?

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• Config Time Service on Server 2008 DC using Group Policy Only

  - by Ed Fries

  I want to configure the Time Service using only GP in a Server 2008 R2 domain. I have created a GP as follows: Computer Config, Policies, Administrative Templates, System, Windows Time Policy: =Global Configuration Settings -Enabled w/ default settings. Computer Config, Policies, Administrative Templates, System, Windows Time Policy,Time Providers: =Configure Windows NTP Client -Enabled w/ default settings. =Enable Windows NTP Client -Enabled w/ default settings. =Enable Windows NTP Server -Enabled w/ default settings. The policy is linked, enforced and applied to Domain Controllers OU. The GP modeling results shows the policy is in effect on the DC (Single DC domain) and the DC is recognized as the PDC emulator. I have run gpupdate /force and logged off/on. The issue is that the DC shows the time source as internal. I understand I can force this at the cmd line using w32tm to set the peer but I would like to understand what is missing in the GP. The default NTP Client GP setting includes time.windows.com,0x9 as the source but it does not appear to be taking effect.

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