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• Swap files in Cloud Infrastructures

  - by ffeldhaus

  At our company we set up an OpenStack Cloud and are currently creating internal guidelines for creation of OS templates / images. One controversial topic was if we should provide swap inside the VM templates. Therefore I'd like to ask the following questions From an elastic Cloud provider point of view, does it make sense to offer swap partitions / files in the VM templates or is swap not needed when a VM can be resized? Which scenarios necessarily demand a swap file to be present? What kind of Storage should be used for swap files (e.g. local / central, FC / iSCSI / NFS)? Are there any best practices for offering swap files in a performant way in Cloud Infrastructures?

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• More Tables or More Databases?

  - by BuckWoody

  I got an e-mail from someone that has an interesting situation. He has 15,000 customers, and he asks if he should have a database for their data per customer. Without a LOT more data it’s impossible to say, of course, but there are some general concepts to keep in mind. Whenever you’re segmenting data, it’s all about boundary choices. You have not only boundaries around how big the data will get, but things like how many objects (tables, stored procedures and so on) that will be involved, if there are any cross-sections of data (do they share location or product information) and – very important – what are the security requirements? From the answer to these types of questions, you now have the choice of making multiple tables in a single database, or using multiple databases. A database carries some overhead – it needs a certain amount of memory for locking and so on. But it has a very clean boundary – everything from objects to security can be kept apart. Having multiple users in the same database is possible as well, using things like a Schema. But keeping 15,000 schemas can be challenging as well. My recommendation in complex situations like this is similar to a post on decisions that I did earlier – I lay out the choices on a spreadsheet in rows, and then my requirements at the top in the columns. I  give each choice a number based on how well it meets each requirement. At the end, the highest number wins. And many times it’s a mix – perhaps this person could segment customers into larger regions or districts or products, in a database. Within that database might be multiple schemas for the customers. Of course, he needs to query across all customers, that becomes another requirement. Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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• Looking for simple windows scan (multiple pages) to one pdf application?

  - by Troggy

  I would like to find some simple scan software for a windows machine that can scan to pdf, but I would like it to do batch or multiple pages into one big pdf. I saw a couple questions on scan to pdf software, but did not see anything talking about scanning to large multiple page pdf's. EDIT: I am surprised there are not more options out there. Do many of the scanners/all in one devices come with included software that perform this function? EDIT 2: I tried Scan2PDF and it locked up on me multiple times in the middle of the scan job and then gave me non-english error messages. Otherwise, I liked how simple the app was, just select number of pages and hit ok. Any other success stories out there?

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• How to setup guest-os raid 1 with vmware esxi?

  - by jM2.me

  In my last questions I didn't make myself clear, so I will do my best to explain it. I have a server with esxi 5 installed on it. I am not able to setup hardware raid atm, and need a workaround. From previous question I have been told to setup a raid for guest-os (don't confuse with hardware/software raid for/on host). I wasn't able to find any information about this, nor found any option in guest-os bios. Help appreciated. Edit: I have two drives setup as datastores. Each drive/datastore will host one image file for guest os

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• Continuous Retraining Tutorials

  - by foampile

  I am looking for an online resource in which you can sortof design your future professional profile and it would provide you a set of tutorials that you would complete to get a basic level of familiarity with related technologies. One of my professional problems is my learning style: I can learn either by direct hands-on experience OR by following a rigid training program that goes in a linear progression. I have a hard time learning things in a multidimensional environment where the biggest challenge is to determine what needs to be learned and how to pick from a ton of books and the least problem is to go through the actual material. So I am looking for a reputable source that will knock those two confusing questions out for me so I can kick back and continuously be upgrading my skills without having to worry about what and how myself. I have found some decent online tutorials for various technologies but never found a single place that has all or most developer education tutorials that all follow the same or similar interface. I am kindof a lazy learner and would rather follow confirmed learning steps than be figuring my own education path just to realize I did it all wrong down the road. Is there a tutorial mega-boutique like that online?

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• Location-Based redirection and duplication in sub-directories affecting SEO

  - by Joshua

  I currently own the website www.xyz.com. The website has a sub-directory for each of the 3 target countries: .../en-US/ (United States), .../es-MX/ (Mexico), and .../es-DO/ (Dominican Republic). I have two main questions about this setup: Currently, the main domain/root (xyz.com) contains a blank index.php file, but I would like for a user to be redirected to one of the sub-directories based on their regional location. What is the best way to accomplish this? I have looked at using browser language-based redirection, but how would I know whether to direct a user to the MX or DO site if the browser language is set to spanish? Is there a way to detect a user's geographic location? Also, the 3 websites are practically identical except they all have 3 unique color schemes and the US site is in english while the MX and DO sites are in spanish. My problem is that I believe GoogleBot is penalizing/banning my site because the spanish text on the MX and DO pages are nearly identical and are thus marked as duplicates/spam. Is there a way to avoid this?

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• htaccess and htpasswd trouble

  - by hjpotter92

  This is the first time that I have ever tried working with .htpasswd and .htaccess files, so please point out my childish works. I have my apache document root set to /www/ on my debian server. Inside it, there's a folder named Logs/ which I want to restrict access using a htpasswd. I created my htpasswd file using the shell's htpasswd command. And this is the result: > user:<encoded password here> > hjp:<encoded password here> > hjpotter92:<encoded password here> I put this file named .htaccess inside /www/. The Logs/ has following htaccess file in it: > AuthName "Restricted Area" > AuthType Basic > AuthUserFile /www/.htpasswd > AuthGroupFile /dev/null > require valid-user This was again created using an online tool(I forgot its name/link, and can't search the browser-history now). The problem, as it might've already struck you is that I am experiencing no change on my Logs folder access. The folder is still accessible to everyone. I am running apache as root user(if that matters/helps). Please help/guide me. I've tried reading some htaccess guides and have followed some of older SO questions, but still haven't figured out a way to restrict access to Logs folder with a password.

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• Web dev/programmer with 4.5 yrs experience. Better for career: self-study or master's degree? [closed]

  - by Anonymous Programmer

  I'm a 28 year-old web developer/programmer with 4.5 years of experience, and I'm looking to jump-start my career. I'm trying to decide between self-study and a 1-year master's program in CS at a top school. I'm currently making 65K in a high cost-of-living area that is NOT a hot spot for technology firms. I code almost exclusively in Ruby/Rails, PHP/CodeIgniter, SQL, and JavaScript. I've slowly gained proficiency with Git. Roughly half the time I am architecting/coding, and half the time I am pounding out HTML/CSS for static brochureware sites. I'd like to make more more money while doing more challenging/interesting work, but I don't know where to start. I have an excellent academic record (math major with many CS credits, 3.9+ GPA), GRE scores, and recommendations, so I am confident that I could be admitted to a great CS master's program. On the other hand, there is the tuition and opportunity cost to consider. I feel like there are a number of practical languages/tools/skills worth knowing that I could teach myself - shell scripting, .NET, Python, Node.js, MongoDB, natural language processing techniques, etc. That said, it's one thing to read about a subject and another thing to have experience with it, which structured coursework provides. So, on to the concrete questions: What programming skills/knowledge should I develop to increase my earning potential and make me competitive for more interesting jobs? Will a master's degree in CS from a top school help me develop the above skills/knowledge, and if so, is it preferable to self-study (possibly for other reasons, e.g., the degree's value as a credential)?

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• How to obtain printed page count if no web-gui or driver-gui is available to show it

  - by Macgreggor at your service

  I am curious if windows print servers can keep a count of the printed pages sent to it? Can an individual PC (WinXP+)? Is there some secret command you can send it (with telnet, dos, etc)? I searched & couldn't find any questions similar to this here so lets keep this open-ended for future people who are curious. Is this more suited towards server fault? Maybe, but this is more about printers & local PC's have print servers now-a-days. Anyhow in my situation I have the following printers (yes old) I am curious on page-counts: HP Laserjet 1300 (using some kind of PC-card to LPT/Parallel adapter, then a network adapter on top of that [Netgear PS101 print server]) Canon Faxphone L80 Epson LX-300+

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• SPF records - what are the differences ?

  - by progeny

  I'm trying to set up an SPF record for my domain. I've read the RFC, been to Wikipedia, openspf.org, etc. but I'm still confused. What is the difference between 'a' and 'mx'? When do I use 'mx: rather than 'a:' or 'include:'? What's the point of '?all' (Neutral result) except for debugging? Why do so many people use '~all' (Softfail) instead of '-all' ? I've been to the Wizard (http://old.openspf.org/wizard.html) but I don't understand the questions.

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• Create timestamp formula for Excel

  - by flpgdt

  The idea is simple, I'd like a function I could do something like =MOD_DATE_OF(A1:A4) and when any of the cells in such range is modified, the cell I assigned that formula gets the current date. I have found some similar questions on the web and even here, but none of them quite it. The closest I've got was this code somewhere (sorry, lost track of the source): Private Sub Worksheet_Change(ByVal Target As Excel.Range) If Target.Column = 1 Then Target.Offset(0, 1).Value = Date End If End Sub But it is still not a function.. I am using Excel from Office 2010 thanks

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• Is "send us a page with code" a typical interview requirement?

  - by acm

  Recently I was asked to show "a page with code" for a job interview. Being mainly a back-end programmer, and that's the position I applied for, I first said to the person I was talking to exactly that: PHP is executed at the server and therefore not visible by just giving a "page". However, following their desire, I sent links to the pages I've worked on before. Obviously they couldn't see anything except for the HTML, CSS, JS... They said it was not enough, they could not see the PHP. Understanding that they probably just wanted to know my skills and/or interest I sent them my Stack Overflow profile. Among all my questions and answers, most of them with code, certainly the PHP is there. But it seems this is not what they wanted. Well, I don't have any code put together that I can simply publish for someone to see. And I would never do it for the code I have deployed, obviously. So my question is/are: What does "send us a page with code" mean? What should I send? Is this a typical interview requirement?

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• web sites leaking memory? IIS 7.5 Windows server 2008 R2

  - by Charles

  I have several web sites on my windows 2008 server that have been working flawlessly for over a year. Just a few days ago I ran into an issue where my server stopped serving up pages on some of these sites for no apparent reason. I dug into it a little more today and I see that some of my sites (they're all asp.net mvc 3.0 sites), are consuming over 460MB of memory. Like I said, this just started the other day after a very long period of time of no issues at all. I have two questions: 1) is there a way to throttle how much memory is consumed by the w3wp process before I can force it to restart (restart the app pool for a particular site) so that it doesn't keep hogging all of the memory? 2) any ideas what could have caused this to start happening?

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• Should I make my project free software?

  - by SkyDan

  The story Over the last couple month I have been working on a pretty big project. It's an enterprise-level software, I designed to be used at a local gym, but I believe it can be used in other places, where things like keeping track of clients, attendances, purchases and payments are required. The problem Well recently, I started to think on how to mature this project from being home-made. Not just because I want my project to grow but also because I would like to have some gain from it. The solutions? And here I saw 2 paths: License the software under some restricted license and try to sell the software to other business around. This way I can get some money for college (I am a high school junior right now) License the software under some free license, publish it on GitHub or something, and try to engage other developers to participate in the project. This way I get experience of working in a team and a better chance that the project will keep growing. The latter would be a good + for my resume, when I'll trying to find a job. So far both ways seem pretty exciting and beneficial to me. The first one offers a good college career, while the second one offers some additional experience and the project's growth. The questions Can anyone point to some other +/- of these 2 options? What would the better option in my situation and why? Or are there other options?

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• MS Access ADP front end and SQL Server back end for field data collection?

  - by Brash Equilibrium

  I am an anthropologist. I am going to the field and will use a netbook to collect survey data. The survey forms will need to allow me to enter data into multiple tables, search tables, allow subforms, and be fast enough to not slow down my interview. I have considered storing the data in a SQL Server Express 2008 R2 server (there will be a lot of data) while using a Microsoft Access data project as a front end. To cut down the number of steps required to collect and store data, I'm considering using the netbook for both data storage and collection (after reading this article about SQL Server on a netbook). My questions are: (1) Is there a simpler solution that is also gratis (gratis because I already have a MS Access license from my workplace, and SQL Server Express is, obviously, free)? (2) Does my idea to store and collect data using the netbook make sense? Thank you.

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• Howto dianostic problem in MySQL Cluster?

  - by maj

  Hi, I have set up a MySQL cluster following exactly this howto. Page 1 is completed, but the problem I can see the nodes in ndb_mgm for a little while, and then I get ndb_mgm> show; Cluster Configuration --------------------- [ndbd(NDB)] 2 node(s) id=2 (not connected, accepting connect from 192.168.0.101) id=3 (not connected, accepting connect from 192.168.0.102) [ndb_mgmd(MGM)] 1 node(s) id=1 @192.168.0.103 (Version: 5.1.45) [mysqld(API)] 2 node(s) id=4 (not connected, accepting connect from any host) id=5 (not connected, accepting connect from any host) ndb_mgm> So the questions is; How do I diagnostic this problem? Does there exist log files I can look in?

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• Common way to store model transformations

  - by redreggae

  I ask myself what's the best way to store the transformations in a model class. What I came up with is to store the translation and scaling in a Vector3 and the rotation in a Matrix4. On each update (frame) I multiply the 3 matrices (first build a Translation and Scaling Matrix) to get the world matrix. In this way I have no accumulated error. world = translation * scaling * rotation Another way would be to store the rotation in a quaternion but then I would have a high cost to convert to a matrix every time step. If I lerp the model I convert the rotation matrix to quaternion and then back to matrix. For speed optimization I have a dirty flag for each transformation so that I only do a matrix multiplication if necessary. world = translation if (isScaled) { world *= scaling } if (isRotated) { world *= rotation } Is this a common way or is it more common to have only one Matrix4 for all transformations? And is it better to store the rotation only as quaternion? For info: Currently I'm building a CSS3D engine in Javascript but these questions are relevant for every 3D engine.

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• nginx: URL rewrites and performance

  - by j0nes

  I have a website where I need to change the URL structure. The old URLs look like /olddir/part1_de.htm, the new ones will look like /newdir/sub/category/anotherpage.htm. There are a lot of URL rewrites I need to do, I assume about 500 distinct rewrites in the end. As my website gets quite a lot of traffic, my main concern is about performance at the moment. My questions are: I assume that for each request, the rewrites block will be parsed and the regex will be evaluated. Am I right? Will there be a performance penalty if I use these rewrites? Can nginx handle this? Are there any "best practices" to follow when doing a lot of rewrites?

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• How do I use a URL path instead of a file path in an Open File dialog in Mac OSX or ChromiumOS?

  - by Chris

  In Windows 7 (and perhaps earlier), the default "Open File" dialog box allows you to type a full URL into the "File name" section as if it were a file path, e.g. "http://www.example.com/pic.gif" instead of "C:/windows/pictures/pic.gif". When uploading a file to a website on the client side - say, an image - this allows the client to upload a picture located on a server accessible via the URL instead of downloading the image, saving it locally, then referencing the local image in the "Open File" dialog. It's a great option for Windows users. I have three separate questions: What is this procedure formally called? How do I describe this succinctly so that my searches for more information are fruitful? Can something similar be done in Mac OSX, Chromium OS, or a Linux environment? If so, how? Thanks!

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• Partitions for dual boot install with Windows

  - by Tim

  Following is the layout of the current partitions of my single hard drive viewed from Windows 7: C: has Windows 7 system files and my personal data; Q: for Lenovo recovery; SYSTEM_DRV: for Windows boot files; My goals are: to create another partition D: for my personal data, and dedicate C: for Windows system files and applications only. to install Ubuntu alongside Windows. D: will be shared between the two OSes. My questions are: Is it correct that the free space generated from shrinking C: will only be able to create an extended partition, since there are already 3 primary partitions? So must D: be one logical partition on the extended partition, just as the partitions for Ubuntu will be? Will this be bad sometime? If yes, other better solutions? What are the good utilities to accomplish the partition tasks? Can Ubuntu installer solely handle them? Or better to have some of the jobs done in Windows with some recommended softwares? Thanks and regards!

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• make gnome3 to work as I expect! [closed]

  - by gnome

  Possible Duplicate: How to revert to GNOME Classic? I don't like unity so I tried Ubuntu Gnome Remix 12.10. But I feel disappointed too. - No right click on desktop. (I know there is a way to enable it). - No icon on desktop. - I want to have "applications", "palces", "systems" on top panel as before. It just takes much more steps to arrive where I want to go in default gnome 3 settings. - It seems to me that for some applications, when it is maximalized, there is no close buttons or "restore to previous size" button. In fact, it has no title bar in this case, so I can't drag the title bar to restore its previous size and move the window. So I got 3 questions here: (for those who like the way gnome work before) What difference between gnome2 and gnome3 that you prefer the way it works in gnome2? How do you change it to work in the gnome2 way? I don't like the appearance in gnome3. For those who have tried to make your gnome3 looks good, could you share how you customize your gnome3 appearance? (this is for chatting only, not a real question) Why all the main OS (Windows, Mac, Some Linux) want to integrate Desktop and Tablet with focus on Tablet? (Which means that when it is installed on a desktop, it still has tablet appearance, which makes things strange.) Do they think the personal desktop PC will become less and less?

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• Apache and fastcgi - How to secure an Apache server with fastcgi enabled?

  - by skyeagle

  I am running a headless server on Ubuntu 10.x. I am running Apache 2.2. I am writing a fastcgi application for deployment on the server. I remember reading a while back (I could be wrong) that running CGI (and by implication fastcgi) on a server, can provide 'backdoors' for potential attackers - or at the very least, could compromise the server if certain security measurements are not taken. My questions are: what are the security 'gotcha's that I have to be aware of if I am enabling mod_fastcgi on my Apache server? I want to run the fastcgi as a specific user (with restricted access) how do I do this?

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• What is the *right* way to use gnome-shell integrated chat?

  - by stevejb

  Please bear with me as I am still figuring out how to use gnome-shell. My question concerns how to use the integrated chat correctly. I have the following questions: 1) When people chat with me, it pops up as a notification on the hidden bar at the bottom of the screen, and then that chat stays there so I can access it later. How do I initiate a chat in this manner, without opening an empathy window? What I have been doing is Hitting super key Typing in the person's name, which brings up contacts Initiate the chat using empathy Immediately close the chat window When the person responds, it comes through as a notification. I then proceed to interact with the chat this way. 2) What is the keyboard shortcut for bringing up the notifications bar? Ideally, I would like to have the following experience Use some keyboard shortcut to bring up notifications Begin typing the name of the notification that I wish to investigate, and have the matching work in a fuzzy manner, much like Ido mode's buffer switching matching in Emacs When then right name is matched, I hit enter and then bring up the chat with that person as that popup notification. Are these behaviours supported? If not, I would be happy to work on implementing them. I am an experienced programmer, but not familiar with gnome-shell. If someone would point me in the right direction in terms of if this behaviour is supported, or where in the gnome-shell framework would I add to to get this behaviour, I would really appreciate it. Thanks!

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• Can I upgrade my ubuntu version and change to be primary OS after originally installing with Wibu?

  - by Garrick Wann

  I have recently installed Ubuntu 12.04 using Wubi 12.04 and I now wish to upgrade to a full installation of Ubuntu 14.04, Before attempting to upgrade through the update center I did some research on upgrading from a Wubi installation (alongside windows) to a full installation making Ubuntu primary and only OS and found that it is in fact doable through the update center however it is just highly recommended to perform a full backup before doing so. I have now finished backing up all the data I need to worry about and began the upgrade process through the update center and received the following error: Your graphics hardware may not be fully supported in Ubuntu 14.04. Running the 'unity' desktop environment is not fully supported by your graphics hardware. You will maybe end up in a very slow environment after the upgrade. Our advice is to keep the LTS version for now. For more information see https://wiki.ubuntu.com/X/Bugs/UpdateManagerWarningForUnity3D Do you still want to continue with the upgrade? My questions are as follows: A. Isnt 14.04 a LTS version??? B, What are your recomendations in order to ensure my graphics driver is installed correctly and im not stuck with bad configs/install?

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• Touchpad won't work/not recognized on laptop, Ubuntu 11.10

  - by The_McManus_Position

  When I start out running 11.10 (Ocelot) from the Live CD the touchpad works with no problem. Once installing however the touchpad does not work at all. I have installed all updates available. I have tried installing the synaptiks touchpad package and the gpointer package from the software manager, this did not help. Under System Settings - Mouse and Touchpad there is only a mouse tab, no touchpad tab. It seems my touchpad is not even recognized. I have tried running several things in the terminal that I have found under similar questions, but I always get errors about the files not being found, or the drivers not being found. Have tried: sudo modprobe -r psmouse sudo modprobe psmouse proto=imps This results in an error message. dconf-editor Can load the GUI, but after that I can't seem to navigate through it to find the files that need editing. Read what's listed here. But I've got no GRUB, running only Ubuntu. As you can see I've been trying several things and nothing has worked so far, would appreciate any help. Thanks!

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