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• ec2 instance won't boot!

  - by TheToolBox

  So I had a server lose connection while updating to 14.04LTS. Foolishly, it ended up getting rebooted, and now I'm here. I disconnected the volume and mounted it on another system, chrooted it, and updated the kernel. Still no dice. Any idea what the problem could be? Thanks in advance! The instance log is below: ******************* BLKFRONT for device/vbd/2049 ********** backend at /local/domain/0/backend/vbd/3005/2049 Failed to read /local/domain/0/backend/vbd/3005/2049/feature-barrier. Failed to read /local/domain/0/backend/vbd/3005/2049/feature-flush-cache. 16777216 sectors of 512 bytes ************************** [H[J Booting 'Ubuntu 14.04 LTS, memtest86+' root (hd0) Filesystem type is ext2fs, using whole disk kernel /boot/memtest86+.bin ============= Init TPM Front ================ Tpmfront:Error Unable to read device/vtpm/0/backend-id during tpmfront initialization! error = ENOENT Tpmfront:Info Shutting down tpmfront xc: error: panic: xc_dom_core.c:621: xc_dom_find_loader: no loader found: Invalid kernel xc_dom_parse_image returned -1 close(3) Error 9: Unknown boot failure Press any key to continue...

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• What is proper way to get specific version of package

  - by Peter

  I am using Ubuntu 14.04 LTS I need to use curl package. But it comes in version 7.35.0 with known SSL bug (already fixed in next version) I either need lower version <= 7.33.0 or higher >= 7.36.0 to make it works, but how can I do it? Do I need to manually install curl? I checked synaptics, "Force Version" feature is greyed out. I also checked apt-cache showpkg curl, there is no other version available. I also tried to add "proposed" repositories, no new curl version either. What should I do? I am thinking about getting .deb package from previous ubuntu release...

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• SQLServerCentral Webinar Series #21 - Forgotten Rings & Other Monitoring Stories

  Most common monitoring metrics are important and useful, especially over time, but they can fall short. How do you gather information to determine, for example, if you have buffer cache pressure? Register now for the free webinar. Wednesday, October 17 2012 4:00pm - 5:00pm BST Are you sure you can restore your backups? Run full restore + DBCC CHECKDB quickly and easily with SQL Backup Pro's new automated verification. Check for corruption and prepare for when disaster strikes. Try it now.

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• Results stored in a session - good idea?

  - by Nick

  To give a bit of background, lets say it's a generic results page, which is paginated so there are X results per page. Generally to do this, I have two queries on the page: to get the total number of results to get the results, limiting by the correct page's resultset However, recently I've been trying to cut down on the queries the site is making, and I thought one way to do this would be to only do the query if any parameters to the page have changed (except of course the page number)? This would then cache all the result id's in a session, which can be sliced when I need to return the correct resultset for that page. I was trying to look around the net to see if there are downsides of this method, but I've found very little information about it. Has anyone done this before? Is it a good idea?

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• Is there an apt command to download a deb file to the current directory?

  - by Lekensteyn

  I am often interested in the installation triggers (postinst, postrm) or certain parts (/usr/share or /etc) of packages. Currently, I am running the next command to retrieve the source code: apt-get source [package-name] The downside is, this file is often much bigger than the binary package and does not reflect the installation tree. Right now, I am downloading the packages through http://packages.ubuntu.com/: Search for [package-name] Select the package Click on amd64/i386 for download Download the actual file This takes too long for me and as someone who really likes the shell, I would like to do something like the next (imaginary) command: apt-get get-deb-file [package-name] I could not find something like this in the apt-get manual page. The most close I found was the --download-only switch, but this puts the package in /var/cache/apt/archives (which requires root permissions) and not in the current directory.

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• Keyboad layout: In 13.10, modified symbols do not apply

  - by MPi

  I like to tweak my Colemak layout a bit, so I changed /usr/share/X11/xkb/symbols/us to contain my changes. Sure, they get lost on an upgrade, but that is not very often. After upgrading to 13.10, this does not work anymore. I changed the file, but the changes are not applied. Neither when I use the settings program, nor when I issue setxkbmap 'us(colemak)' directly. Where is this data stored now, is there some kind of cache?

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• Google I/O 2010 - GWT Linkers target HTML5 WebWorkers & more

  Google I/O 2010 - GWT Linkers target HTML5 WebWorkers & more Google I/O 2010 - GWT Linkers target HTML5 Web Workers, Chrome Extensions, and more GWT 301 Matt Mastracci At its core GWT has a well-defined and customizable mechanism -- called Linkers -- that controls exactly how GWT's compiled JavaScript should be packaged, served, and run. This session will describe how to create linkers and explains some of the linkers we've created, including a linker that turns a GWT module into an HTML5 Web Worker and one that generates an HTML App Cache manifest automatically. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 6 1 ratings Time: 59:59 More in Science & Technology

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• Unable to locate essential development tools Ubuntu 11.04

  - by Anita 7

  I'm using Ubuntu 11.04 (VMware). I aim to implement OpenMP. Im using gcc 4.5 compiler. I tried to install it by using the command sudo apt-get install gcc 4.5. Afterwards I proceed with gcc -fopenmp foo.c BUT the output was: gcc: foo.c: No such file or directory gcc: no input files –. Now I tried to install the package by using : ubuntu@ubuntu:~$ sudo apt-get install essential Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package essential. I also tried apt-cache search essential and after that sudo apt-get install essential-dev But the same error again, E: Unable to locate package essential-dev Any solution,please? Do I need to download any package? What should I do? Thank you in advance :))

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• Are HTTP requests cached? [closed]

  - by nischayn22

  Many HTTP requests are sent repeatedly by browsers on almost every page load, such as requesting the jQuery .js file etc. Since these are already used on too many sites doesn't modern browsers keep a cache for this? I am thinking of a system where the browser has a cached copy of the .js file used very very frequently. On a new request for the .js file, it sends the server a request for a hash of the .js file (provided the server can reply to that) and compares the returned hash with the cached copy's hash... rest is intuitive.

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• How to CURL and avoid timeout death (Twitter Down) [migrated]

  - by David

  Twitter is down right now, and one of my site's home pages relies on getting data from Twitter (relies is the problem - it should be more of an accessory feature, as it just shows follow count from its feed). Here's the code in question: function socials_Twitter_GetFollowerCount($username) { $method = function () use ($username) { return file_get_contents('https://api.twitter.com/1/users/show.json?screen_name='.$username.'&include_entities=true'); }; $json = cache('bmdtwitter', 3600, $method, false); $json = json_decode($json, true); return intval($json['followers_count']); } What is a good way to make it so if Twitter is down (or not responsive for some reasonable amount of time), our site doesn't appear to be down (I think the timeout maybe defaulting to 30-60 seconds or more).

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• MySQL Utility Users' Console Oerview

  - by rudrap

  MySQL Utility Users' Console (mysqluc): The MySQL Utilities Users' Console is designed to make using the utilities easier via a dedicated console. It helps us to use the utilities without worrying about the python and utility paths. Why do we need a special console? - It does provide a unique shell environment with command completion, help for each utility, user defined variables, and type completion for options. - You no longer have to type out the entire name of the utility. - You don't need to remember the name of a database utility you want to use. - You can define variables and reuse them in your utility commands. - It is possible to run utility command along with mysqluc and come out of the mysqluc console. Console commands: mysqluc> help Command Description ----------------------           --------------------------------------------------- help utilities                     Display list of all utilities supported. help <utility>                  Display help for a specific utility. help or help commands   Show this list. exit or quit                       Exit the console. set <variable>=<value>  Store a variable for recall in commands. show options                   Display list of options specified by the user on launch. show variables                 Display list of variables. <ENTER>                       Press ENTER to execute command. <ESCAPE>                     Press ESCAPE to clear the command entry. <DOWN>                       Press DOWN to retrieve the previous command. <UP>                               Press UP to retrieve the next command in history. <TAB>                            Press TAB for type completion of utility, option,or variable names. <TAB><TAB>                Press TAB twice for list of matching type completion (context sensitive). How do I use it? Pre-requisites: - Download the latest version of MySQL Workbench. - Mysql Servers are running. - Your Pythonpath is set. (e.g. Export PYTHONPATH=/...../mysql-utilities/) Check the Version of mysqluc Utility: /usr/bin/python mysqluc.py –version It should display something like this MySQL Utilities mysqluc.py version 1.1.0 - MySQL Workbench Distribution 5.2.44 Copyright (c) 2010, 2012 Oracle and/or its affiliates. All rights reserved. This program is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, to the extent permitted by law. Use of TAB to get the current utilities: mysqluc> mysqldb<TAB><TAB> Utility Description -------------        ------------------------------------------------------------ mysqldbcopy      copy databases from one server to another mysqldbexport    export metadata and data from databases mysqldbimport    import metadata and data from files mysqluc> mysqldbcopy –source=$se<TAB> Variable Value -------- ---------------------------------------------------------------------- server1 root@localhost:3306 server2 root@localhost:3307 you can see the variables starting with se and then decide which to use Run a utility via the console: /usr/bin/python mysqluc.py -e "mysqldbcopy --source=root@localhost:3306 --destination=root@localhost:3307 dbname" Get help for utilities in the console: mysqluc> help utilities Display help for a utility mysqluc> help mysqldbcopy Details about mysqldbcopy and its options set variables and use them in commands: mysqluc> set server1 = root@localhost:3306 mysqluc>show variables Variable Value -------- ---------------------------------------------------------------------- server1    root@localhost:3306 server2    root@localhost:3307 mysqluc> mysqldbcopy –source=$server1 –destination=$server2 dbname <Enter> Mysqldbcopy utility output will display. mysqluc>show options Display list of options specified by the user mysqluc SERVER=root@host123 VAR_A=57 -e "show variables" Variable Value -------- ----------------------------------------------------------------- SERVER root@host123 VAR_A 57 Finding option names for an Utility: mysqluc> mysqlserverclone --n Option Description ------------------- --------------------------------------------------------- --new-data=NEW_DATA the full path to the location of the data directory for the new instance --new-port=NEW_PORT the new port for the new instance - default=3307 --new-id=NEW_ID the server_id for the new instance - default=2 Limitations: User defined variables have a lifetime of the console run time.

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• Is there an apt command to download a deb file from the repositories to the current directory?

  - by Lekensteyn

  I am often interested in the installation triggers (postinst, postrm) or certain parts of packages (like /usr/share and /etc). Currently, I am running the next command to retrieve the source code: apt-get source [package-name] The downside is, this file is often much bigger than the binary package and does not reflect the installation tree. Right now, I am downloading the packages through http://packages.ubuntu.com/: Search for [package-name] Select the package Click on amd64/i386 for download Download the actual file This takes too long for me and as someone who really likes the shell, I would like to do something like the next (imaginary) command: apt-get get-deb-file [package-name] I could not find something like this in the apt-get manual page. The most close I found was the --download-only switch, but this puts the package in /var/cache/apt/archives (which requires root permissions) and not in the current directory.

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• Visual Studio Load Tests Virtual Users Simulation

  - by Eldar

  Hello, I'm currently working on writing a load testing application that takes advantage of Load Test using Visual Studio 2010. The load test will simulate 20 users on the same machine, and I need some data to be shared in-memory between all simulated users. I was suprised I couldn't find documentation answering the following question: What seperates each virtual user's running context from the other? Does each virtual user runs the tests in its own process? Maybe in its own app domain? Or just on its own thread? I need to know because if each user is running tests in its own process then all the in-memory cache isn't shared and is created for each user instead of one time for all of them, which is bad for me.

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• Dash empy and blank Software Center

  - by fra_casula

  I've Ubuntu 12.10.1 LTS x62 fresh of installation... My dash is empty, search doesn't work and applications list is empty. If I run the Ubuntu Software Center it freeze in a blank screen. I tried with: restart reinstall of unity packages deleting ~/.local/share/zeitgeist folder other tricks found in the other askubuntu answers UPDATE: From ~/.xsession-errors I/O warning : failed to load external entity "/home/francesco/.compiz/session/10699c9c27649d05db134910329935534100000027470033" Initializing session options...done (compiz:2813): GConf-CRITICAL **: gconf_client_add_dir: assertion `gconf_valid_key (dirname, NULL)' failed ** (zeitgeist-datahub:3070): WARNING **: zeitgeist-datahub.vala:227: Unable to get name "org.gnome.zeitgeist.datahub" on the bus! EDIT: Deleting .cache folder solves the Ubuntu Software Center blank screen issue, thanks to jokerdino!!

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• Set modified date = created date or null on record creation?

  - by User

  I've been following the convention of adding created and modified columns to most of my database tables. I also have been leaving the modified column as null on record creation and only setting a value on actual modification. The other alternative is to set the modified date to be equal to created date on record creation. I've been doing it the former way but I recent ran into one con which is seriously making me think of switching. I needed to set a database cache dependency to find out if any existing data has been changed or new data added. Instead of being able to do the following: SELECT MAX(modified) FROM customer I have to do this: SELECT GREATEST(MAX(created), MAX(modified)) FROM customer The negative being that it's a more complicated query and slower. Another thing is in file systems I believe they usually use the second convention of setting modified date = created date on creation. What are the pros and cons of the different methods? That is, what are the issues to consider?

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• CSS not loading when site is viewed via Windows VPN

  - by Dreamling

  Internal site has recently been redesigned, but IE8 does not seem to be loading the new css rules only when viewed via VPN. I really have no clue what to look for. I can't reproduce the problem, but it's apparently affecting client for the last month. I've suggested: Reloading IE8 Checking Internet Permissions Flushing the cache I'm not really certain what direction to search for the answer. Is it likely to be a server permissions issue? a VPN connection issue? a rare ie8 CSS bug?

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• apt-get could not open lock file

  - by user114373

  I am trying to get an nfs client running on a Sheeva-plug running debian 2.6.22. The host is Ubuntu 12.04 and claims (from showmount -e) to be exporting the desired directory. There is no showmount binary in the sheeva-plug, so I'm trying to install it from the nfs-common package: # apt-get install nfs-common The response ends with E: could not open lock file /var/cache/apt/archives/lock - open (no such file or directory) E: Unable to lock the download directory. I am root while doing this. Similar errors arise when trying to install other packages. How do I correct these errors so apt-get will do its work?

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• Navigation for ASP.NET Web Forms project published on codeplex

  Navigation for ASP.NET Web Forms manages movement and data passing between aspx Pages in a unit testable manner. There is no Client-side logic, so it works in all browsers, and no Server-side cache, so it works with the browser back button.Features include loosely coupled Pages, typed data passing, empty code-behinds, context-sensitive bread crumb trail, ASP.NET Data binding integration, automatic ASP.NET Ajax history navigation and many more.The source code, binaries and comprehensive documentation...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• How to implement proper identification and session managent on json post requests?

  - by IBr

  I have some minor messaging connection to server from website via json requests. I have single endpoint which distributes requests according to identification data. I am using asynchronous server and handle data when it comes. Now I am thinking about extending requests with some kind of session. What is the best way to define session? Get cookie when registered and use token as long as session runs with each request? Should I implement timeout for token? Is there alternative methods? Can I cache tokens to same origin requests? What could I use on client side (Web browser)? How about safety? What techniques I should use to throw away requests with malformed data, to big data, without choking server down? Should I worry?

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• Google s'offre une nouvelle interface, et optimise l'intelligence de ses recherches

  Google s'offre une nouvelle interface, et optimise l'intelligence de ses recherches Google s'est offert un lifting de printemps. La page d'accueil du moteur de recherche et si sobre et discrète que le moindre changement n'y passe pas inaperçu. Depuis aujourd'hui, Google.com a une nouvelle présentation. A côté d'un logo aux couleurs plus vives, le site se divise en trois panneaux : à gauche, les options ; au centre, les résultats ; et à droite, la publicité. L'onglet des options, d'habitude caché par défaut, est mis en avant. Un moyen de pousser les internautes à tester ces filtres de recherche qui ne sont pas nouveaux, mais encore trop méconnus du grand public. Par exemple, "update" : la recherche en temps...

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• Why are the proposed BADSIG (on apt-get update) fixes secure?

  - by EvanED

  I'm running apt-get update, and I see errors like W: GPG error: http://us.archive.ubuntu.com precise Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <[email protected]> It's not hard to find instructions on how to fix these problems, for instance by asking for the new keys with apt-key adv --recv-keys or rebuilding the cache; so I'm not asking about how to fix these. But why is this the right thing to do? Why is "oh, I need new keys? Cool, go get new keys" not just defeating the purpose of having a signed repository in the first place? Are the keys signed by a master key that apt-key checks? Should we be doing some additional validation to ensure that we're getting legitimate keys?

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• SQL SERVER Data Pages in Buffer Pool Data Stored in MemoryCache

  This will drop all the clean buffers so we will be able to start again from there. Now, run the following script and check the execution plan of the query. Have you ever wondered what types of data are there in your cache? During SQL Server Trainings, I am usually asked if there is any [...]...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• how to download and install from the internet >> skype and realplayer

  - by ADAM

  i had corrupted win7 by dead blue screen and stopped rebooting or installing or safe mode. just death i installed linux unubtu one i still unable to install my wireless stick modem for surfing internet wirelessly form my provider vividwireless i don't know where or how to download porg and app from the net like real player and skype and others and to intall them. even i cannot find them after download. can i revive and reboot or fix my dead win7 os from linux. i can connect internet from wireless network in the neighborhood linksys!! what is linksys anyway? how to use linux ubuntu same way like windows? ie. insalling, using cd rom for installation and downloading and cleaning history and cache and system restore? please email me to: [email protected] any help..step by step many thanks

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• How can I convince a project manager that there is no way to solve all the compatibility issues?

  - by SAFAD

  I have been working on this project for more than a year now, and we are close to release, the project manager wants the product to be perfect and working in every single aspect. I like that and I love working under the perfection idea, but it seems he is delaying the launch too much because of compatibility issues, he wants the product to work in every single installation, every single configuration possible, and in most cases, the product just works without issues when it's on the hands of the client. UPDATE : yes the product doesn't work properly when there are conflicts, for example, other products that don't use guidelines nor standards to load libraries (causes double library load which leads to failure), cache is another example and so on..... but we warn the clients about the conflict before purchasing and help them fixing it after purchasing I've tried to explain it by giving some examples on major products, he understands the situation, but can not believe that it is near impossible (if it is not impossible) to do what he wants. Hope it is clarified enough for the community to answer.

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• How do I create stand alone packages from ubuntu repository

  - by tachyons

  Is it possible to create a stand alone deb packages by merging dependancies without manual repacking.?? I've looked at this question but it doesn't really answer what I'm trying to achieve above. if possible how to do it? update 1 No tools available yet(?) So what about creating new deb package containing all packages which will copy dependencies to the cache and executing main package. Is it possible? update 2 Above method appears to be impossible because dpkg cant handle more than one operation at a time. Some scripts may can do it update 3 this tool is very helpful but it currently wont support oneric and above still waiting for more generic tool Thanks in advance

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