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  • Combining multiple linux boxes and create VMs out of it

    - by NS Gopikrishnan
    I am new to virtualization. I am running on ubuntu. I have a set of linux machines (5 to 6 machines). Which I want to combine as a single resource pool and on demand create multiple virtual instances of machines out of it. This is comparable to what VirtualBox does in a single system. I stumbled across many key words: Xen, Eucalyptus, OpenStack etc. But things are very vague as to which will help me achieve this requirement. Any help will be appreciated :) Thanks in advance!

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  • phpmyadmin or other mysql gui - edit whole table from one screen

    - by lorem
    Let's say I have table in database. I'd like to be able to view all data from this table and be able to edit every field from single screen. I tried to do this in phpmyadmin but I'm not sure how... I can see all data but I have to click edit on single field and then I'm sent to next screen, can't really edit everything at once. How do I do this in phpmyadmin or other mysql gui? I'm on Linux, my server too. I'd like each field in table to be editable text field - maybe this will show better what I'm searching for.

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  • is using Hosts for resolving a sql-server more performant?

    - by Ice
    Hi, we have a legacy application which uses a access.mdb with hundreds of ODBC-connected tables on a sql-server. the access.mdb contains nothing else than these odbc-connections. Now we consider to use a virtual sql-servername for these odbc connections and resolve it in the local hosts-file with the ip-address of the real sql-server. Like this we can easy switch between a test-sql-database server and the the server for production in changing one single entry in the hosts. EVERYTHING works fine and now comes the question: Could it be that this is more performant because there is one single point on resolving the sql-server (name or ip-address)? Is there something like a network-cache / DNS-Cache? peace Ice

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  • Using mod_rewrite for a Virtual Filesystem vs. Real Filesystem

    - by philtune
    I started working in a department that uses a CMS in which the entire "filesystem" is like this: create a named file or folder - this file is given a unique node (ex. 2345) as well as a default "filename" (ex. /WelcomeToOurProductsPage) and apply a template assign one or more aliases to the file for a URL redirect (ex. /home-page-products - can also be accessed by /home-page-products.aspx) A new Rewrite command is written on the .htaccess file for each and every alias Server accesses either /WelcomeToOurProductsPage or /home-page-products and redirects to something like /template.aspx?tmp=2&node=2345 (here I'm guessing what it does - I only have front-end access for now - but I have enough clues to strongly assume) Node 2345 grabs content stored in a SQL Db and applies it to the template. Note: There are no actual files being created on the filesystem. It's entirely virtual. This is probably a very common thing, but since I have never run across this kind of system before two months ago, I wanted to explain it in case it isn't common. I'm not a fan at all of ASP or closed-sourced systems, so it may be that this is common practice for ASP developers. My question, that has taken far too long to ask, is: what are the benefits of this kind of system, as opposed to creating an actual file hierarchy? Are there any drawbacks to having every single file server call redirected? To having the .htaccess file hold rewrite rules for every single alias?

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  • options for physical architecture of rails site regarding caching server or cdn

    - by timpone
    I have a rails app that is set on a single server currently. On production, I force_ssl for everything. I am interested in using a caching server for images (I'm fine with css and js being served from origin for time being). Would nginx or varnish (which I have no experience with) be a better solution (for October 2012)? I'd imagine that it would be easy to switch these around while still on this single server architecture. Or would something like cloudfront (which I also have no experience with) make sense for hosting image files? I know this is a vague question but appreciate any current feedback. thx in advance

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  • Two SSL certificates required for two Apache servers using mod_proxy to serve HTTPS?

    - by Nick
    Our application originally used a single Apache server with mod_perl installed to serve up all HTTPS requests. Due to memory issues I've added a lighter Apache installation and used ProxyPass to hand off the Perl requests to the mod_perl enabled server. We currently have an SSL certificate installed on the mod_perl server but I'm struggling to understand whether we need a certificate for both servers or only the lightweight server which is receiving the original requests. Or can a certificate be used for more than one server on a single machine? Thanks in advance for any help/pointers.

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  • Can most Intel processors run 64-bit Windows 7?

    - by Jian Lin
    Can most Intel processors run 64-bit Windows 7? Such as all the i7, i5, Core 2 Duo, Dual Core, Single Core with HT, and even just Single Core? I think a popular view is that if you can run 64-bit Windows 7, then use it? It might have driver compatibility issue but if there is no device hooked up, then there is no problem? What about some software / games not compatible with the 64-bit version or may run slower? thanks. update: a couple of my machines have 4GB RAM. so 64-bit Win 7 can make use of the full 4GB RAM instead of only about 3.2GB

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  • Is "If a method is re-used without changes, put the method in a base class, else create an interface" a good rule-of-thumb?

    - by exizt
    A colleague of mine came up with a rule-of-thumb for choosing between creating a base class or an interface. He says: Imagine every new method that you are about to implement. For each of them, consider this: will this method be implemented by more than one class in exactly this form, without any change? If the answer is "yes", create a base class. In every other situation, create an interface. For example: Consider the classes cat and dog, which extend the class mammal and have a single method pet(). We then add the class alligator, which doesn't extend anything and has a single method slither(). Now, we want to add an eat() method to all of them. If the implementation of eat() method will be exactly the same for cat, dog and alligator, we should create a base class (let's say, animal), which implements this method. However, if it's implementation in alligator differs in the slightest way, we should create an IEat interface and make mammal and alligator implement it. He insists that this method covers all cases, but it seems like over-simplification to me. Is it worth following this rule-of-thumb?

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  • Ubuntu 13.04 Sound Problem after following weird commands

    - by user206356
    After launching a few commands : echo autospawn = no >> ~/.config/pulse/client.conf #use ~/.pulse/client.conf on Ubuntu <= 12.10 killall pulseaudio $LANG=C pulseaudio -vvvv --log-time=1 > ~/pulseverbose.log 2>&1 My sound does not work. (just with the speakers, with headphones it works but I can not change the volume) The sound icon on the top right corner does show a speaker with a single non continuous line. I can not change the volume; it is frozen. There can be an extremely low output of the sound (I hear something but I am not sure...) It does not show a single output device that is avalaible, not even the "dummie". I have tried to reset pulseaudio, alsa, remove it, purging it, reinstalling it, without having success. EDIT: I have tried launching pulseaudio via the terminal. It worked :D However, I am very surprised why it does not automatically start at the start of the computer. Any ideas ? Here the console output : W: [pulseaudio] authkey.c: Failed to open cookie file '/home/simonm/.config/pulse/cookie': No such file or directory W: [pulseaudio] authkey.c: Failed to load authorization key '/home/simonm/.config/pulse/cookie': No such file or directory W: [pulseaudio] authkey.c: Failed to open cookie file '/home/simonm/.pulse-cookie': No such file or directory W: [pulseaudio] authkey.c: Failed to load authorization key '/home/simonm/.pulse-cookie': No such file or directory

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  • Stopping immediate right button up in Mint 13 (Cinnamon) actioning first menu choice

    - by jontyc
    In Windows, a single right click (i.e., with release) displays a context menu on the screen, allowing you to select the appropriate choice with a further click from either button. In Mint 13, Cinnamon, it's hold down the right button, drag, then release on the appropriate menu choice. Both methods are fine, but constantly using both OSs regularly, I'm doing the Windows procedure in Mint by mistake all the time. This makes the single right click and release bring up the context menu and immediately action the first menu choice. Is there any mechanism to ignore right-button-up if a substantial dragging action or time period hasn't occurred, and have Mint looking for a further click to select?

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  • Windows 7 search for files with special characters in name.

    - by Luke
    I have a rather large source code repository on my machine; it is not indexed by Windows Search. I am trying to find some oddly-named generated files of the form .#name.extension.version where name and extension are normal names and extensions and version is a numeric value (e.g. something like 1.186). On Windows XP I could find these files by searching for .#*; on Windows 7 that just returns every single file and directory. So my question is this: is it possible to find files named like that using the built-in Windows 7 search functionality? I did find this question which is very similar, but the answer doesn't work for me; it seems like any special character I put in the query is either ignored or treated as a wildcard, and as a result it matches every single file and directory. Is there perhaps some registry value I can set to make the search-by-filename feature work with special characters?

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  • Merging two sites into one, how to redirect from the domain that's going away?

    - by bikeboy389
    I haven't been able to find any existing questions that cover my exact issue, so here goes: My client wants her two sites (domain1.com and domain2.com) rolled into a single, new site under domain1.com. Once the site is ready on domain1.com, DNS for domain2.com would be pointed at the same server as domain1.com. I know how to do an htaccess rewrite rule that would make all domain2.com traffic map to a specific single page or directory within domain1.com. But that's not what the client wants. What she wants is for a bunch of specific pages on domain2.com to map to specific new pages on domain1.com. For example: domain2.com/index.php?pageid=58 GOES TO domain1.com/2011/04/somearticle domain2.com/index.php?pageid=92 GOES TO domain1.com/2011/03/differentname etc. I could put a bunch of 301 redirects in the htaccess on domain1.com, which would work fine. The problem is, the client doesn't want/need specific redirects for ALL the domain2.com pages, and if I just do 301 redirects, anybody who comes looking for a domain2.com page that I haven't built a specific redirect for will get a 404 error. So I need to use 301 redirects for some traffic, and a rewrite rule for any traffic that's not covered in the 301 redirects. How do I do sort of a blending of a rewrite rule and 301 redirects, all in the htaccess file for domain1.com? Is this possible? Is it as simple as putting the 301 redirects in the htaccess file first, then doing the rewrite rule? I'm guessing not.

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  • Tar an gzip together, but the other way round?

    - by Boldewyn
    Gzipping a tar file as whole is drop dead easy and even implemented as option inside tar. So far, so good. However, from an archiver's point of view, it would be better to tar the gzipped single files. (The rationale behind it is, that data loss is minified, if there is a single corrupt gzipped file, than if your whole tarball is corrupted due to gzip or copy errors.) Has anyone experience with this? Are there drawbacks? Are there more solid/tested solutions for this than find folder -exec gzip '{}' \; tar cf folder.tar folder

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  • For very beginning startup: home server or EC2?

    - by StCee
    The micro instance of Amazon EC2 only has ram of 613MB, my laptop got 8GB. And I suppose likewise the processing power of my computer would be better than the micro instance. My question is, what are the considerations in deciding to host yourself or on Amazon EC2, especially for a really baby startup? For example, would network speed be a problem? My computer broadband network is 100Mbs up to 1Gbs. What would Amazon compare to this? My site at these moment would just host some images and perform some php requests. I would probably also use cloudflare but seems it increases the dns lookup time considerably... And of course the overall objective is to make the best user experience.

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  • What is the preferred pattern when attaching a 'runtime object'?

    - by sebf
    In my application I have the following: public class NeatObject { /* lots of static data, and configuration flags */ } public class NeatObjectConsumer { void DoCleverStuffWithObjectOnGPU(NeatObject obj); } Where NeatObject and its consumer are used to control the GPU. The idea being that, the configuration of an instance of NeatObject and its members, define how the consumer instance behaves. The object can be passed around, edited, and most importantly serialised/deserialised by the application, with and without knowledge of NeatObjectConsumer, then provided back to the consumer to do something else. The purpose of this seperation is: The consumer manages hardware resources, which change depending on the computer, and even on the execution of the application, making preserving the state of an object which does everything difficult. Avoids circular references if the assembly that contains the consumer needs to reference one that only needs to know about NeatObject. However, there is a complication in that the consumer creates hardware resources and needs to associate them with NeatObject. These don't need to be preserved, but still need to be retrieved. DoCleverStuffWithObjectOnGPU() will be called many, many times during execution and so any bottleneck is a concern, therefore I would like to avoid dictionary lookups. What is the preferred method of attaching this information to NeatObject? By preferred, I mean intuitive - other coders can see immediately what is going on - and robust - method doesn't invite playing with the resources or present them in such a way as to make them easily corruptible. Essentially, I want to add my own metadata - how should I do it? Try to use 'actual metadata' functionality like Reflection? A member of the type of an abstract class? Unmanaged pointers? If you took on a project that used this pattern, what would you have liked the previous developer to do?

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  • using sed to replace two patterns within a larger pattern

    - by Hair of the Dog
    Using sed how could I replace two patterns within a larger pattern on a single line? Given a single line of text I want to find a pattern (Let's call this the outer pattern) and then within that outer pattern replace two inner patterns. Here's a one line example of the input text: Z:\source\private\main\developer\foo\setenv.sh(25): export 'FONTCONFIG_PATH'="$WINE_SHARED_SUPPORT/X11/etc/fonts" In the example above the outer pattern is "/^.*([[:digit:]]+):/" which should equal "Z:\source\private\main\developer\foo\setenv.sh(25):" The two inner patterns are "/^[A-Za-z]:/" and "/\/". Another way to phrase my question is: Using sed I know how to perform replacements of a pattern using the "s" command, but how do I limit the range of "s" command so it only works on the portion of the input string up to the "(25):"? The ultimate result I am trying to get is the line of text is transformed into this: /enlistments/source/private/main/developer/foo/setenv.sh(25): export 'FONTCONFIG_PATH'="$WINE_SHARED_SUPPORT/X11/etc/fonts"

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  • How Can I Automate the Backup of a Quickbooks Server?

    - by Nick
    I have three computers: The first is the company file server which has the Quick Books company file, is always on, and lives in the closet. The other two are Quick Books Clients. All are XP Pro. I need a way to automatically backup the QB data file, without any user intervention. Quick Books has a built in scheduled backup utility, but from what I've read, it only works when the software is running in single user mode. (and obviously putting the server into single user mode defeats the concept of having a server). Also, I'm not actually running QB itself on the server, just the "QB Database Server" process that sits in the system tray. Surely there must be a way to automate this? I'm open to any ideas/suggestions. Thanks!

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  • How can we add arch specific conflicts tag when building .deb package?

    - by Sphopale
    We are trying to build multi-arch supported i386 .deb package. There are two .deb packages build on i386 X1 & X2 (X2 is a subset of X1 binaries). X1 <- X2 conflict each other when installing . Only one .deb package can be installed at any instance. We similarly have binaries on xa64 arch. Again on xa64, there are two .deb packages X1 & X2 (X2 is a subset of X1 binaries). X1 <- X2 conflict each other when installing . Only one .deb package can be installed at any instance. In case of multi-arch i386 .deb package,i386 .deb packages (X1 & X2) can be installed on xa64 along side with 64bit (X1 & X2) However I see that when installing X1:i386 & X1:amd64 can co-exist However, it throws conflict error when trying to install X1:i386 & X2:amd64 In short, Can we mark package to conflict based on arch Conflict: X2:i386 X1:i386 package should only conflict with X2:i386 & allow other packages to co-exist X1:amd64 package should only conflict with X2:amd64 & allow other packages to co-exist X1:i386 can co-exist with X1:amd64 OR X2:amd64 X2:i386 can co-exist with X1:amd64 OR X2:amd64 Thanks for your reply

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  • Simplest way to respawn configured number of instances of a specific process.

    - by Zwei Steinen
    So we have an app. which we wan to run multiple instance of it in linux. The number should be configurable. We also want that whenever one of the instance disappears, a new one is booted up. I was looking into C based programs, shell script, python script etc. but I was wondering what would be the most simple, easiest way to do it. Are there any tools out there? Can one simply use some linux built-in functionality? Linux distribution is Red Hat.

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  • Redirect with iptables if destination port is not listened

    - by PoltoS
    I've a server listening on port 10000. But this server is running only in a special case (then some third service is available). Otherwise the port is not listened. Is it possible to redirect the client to another port if 10000 is not listening? I see two solutions: 1) insert/remove iptables rules on server start/stop, but since the server may be killed, it may not insert the correct iptable redirect rule before dieing. 2) make a permanent userspace rule that checks if the port is listening and redirects the packet if not listened. How to do 2) ? Do someone have recipes for ipq? May be someone can suggest me a better way? It is something like fallback redirect: I'll have thousand of clients with different ports (10000-11000) and if their instance of server is not running, whey should be redirected to some page explaining why they don't have and instance connected.

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  • mod_security: How to allow ssh/http access for admin?

    - by mattesque
    I am going to be installing mod_security on my AWS EC2 Linux instance tonight and need a little help/reassurance. The only thing I am truly worried about right now is making sure my (admin) access to the instance and webserver is maintained w/o compromising security. I use ssh (port 22) and http (80) to access this and I've read horror stories from other EC2 users claiming they were locked out of their sites once they put up a firewall. So my question boils down to: What settings should I put in the mod_security conf file to make sure I can get in on those ports? IP at home is not static. (Hence the issue) Thanks so, so, so much.

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  • If an entity is composed, is it still a god object?

    - by Telastyn
    I am working on a system to configure hardware. Unfortunately, there is tons of variety in the hardware, which means there's a wide variety of capabilities and configurations depending on what specific hardware the software connects to. To deal with this, we're using a Component Based Entity design where the "hardware" class itself is a very thin container for components that are composed at runtime based on what capabilities/configuration are available. This works great, and the design itself has worked well elsewhere (particularly in games). The problem is that all this software does is configure the hardware. As such, almost all of the code is a component of the hardware instance. While the consumer only ever works against the strongly typed interfaces for the components, it could be argued that the class that represents an instance of the hardware is a God Object. If you want to do anything to/with the hardware, you query an interface and work with it. So, even if the components of an object are modular and decoupled well, is their container a God Object and the downsides associated with the anti-pattern?

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  • Associate a texture to an object (from a data-model, not graphical point of view).

    - by Raveline
    I'm writing a roguelike where objects and floor can be made of different materials. For instance, let's say we can have a wooden chair, an iron chair, a golden chair, and so on. I've got an Object class (I know, the name is terrible), which is more or less using a composite pattern, and a Material class. Material have different important properties (noise, color...). For the time being, there are 5 different instances of materials, created at the initialization of the game. How would connect an instance of Object with one of the 5 instances of materials ? I see three simple solutions : Using a pointer. Simple and brutal. Using an integer material-id, then get the materials out of a table when engine manipulates the object for various purposes (display, attack analysis, etc.). Not very beautiful, I think, and not very flexible. Using an integer material-id, then get the materials out of a std::map. A bit more flexible, but still not perfect. Do you see other possibilities ? If not, what would you choose (and why) ? Thanks in advance !

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  • Solution for file store needing large number of simultaneous connections

    - by Tennyson H
    So I'm fairly new to large-scale architectures. We're currently using linode instances for our project, but we're brainstorming about scaling. We need a file store system than can deliver ~50mb folders (user data) to our computing instances in a reasonable amount of time (<20 sec), and scale to 10000+ total users, and perhaps 100+ simultaneous transfers. We are also unsure whether to network mount (sshfs/nfs) or just do a full transfer store-instance at the beginning and rsync instance- store at the end. I've experimented with SSH-FS between our little Linode instances but it seems to be bottlenecked at 15mb/s total bandwith, which wouldn't do under 10+ transfer stress let alone scale v. large. I also tried to investigate NFS but couldn't get it working but have little hope that it'll do within our linode network. Are there tools on other cloud providers that match our needs? Should we be mounting, or should we be transferring? Thanks very much!

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  • SCCM? Overkill?

    - by Le_Quack
    T. technician in a high school with around 1600 students 250 staff and 800+ client computers mostly running W7 I'm looking for a better way to manage clients (deploy software, track changes, inventory etc) I like the look of SCCM 2012 features but the case studies seem to be aimed at large multi-site infrastructural rather than a single mid sized site. Is SCCM suitable for a mid sized single site or is it aimed at much larger corporations, if so what would be more suitable Just a note about me and my situation. I work as a technician in a school part of a team of 3. My boss seems content with a network that works (just about) not a productive well maintained network that is easy to run and maintain. I'm still fairly early on in my I.T. career so sorry if I'm not up to speed on all products. EDIT: Thanks for all the help I'll take a look at SCE and SCCM and get some proposals drawn up to take to my boss/deputy head

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