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  • get a list of running ec2 instances programmatically

    - by user113981
    Hi i have started with aws and found out that we can get a list of running servers with the aws php sdk. Is there any other way to get the list of all ec2 instances? after getting the list i want to sync the data from one main instances to all the instances. Something like a button click can also do the operation. Are rsync, incron the only options, or it can be done by aws php sdk also. Please provide some tutorial links.

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  • Apache redirect alias to a different domain

    - by John Magnolia
    I previous had both Web and Mail on the same server and for each of my vhosts/domains, I could visit example.com/mail or foo.com/mail which would display the Roundcube Webmail across all vhosts. E.g Alias /mail "/usr/share/apache2/roundcub/" Although now I have moved the Mail server onto a completely different server and now have a SSL for the main domain. https://mail.example.com which is now the new location of Roundcube for all vhosts/domains. Question: is it possible to redirect all alias for "/mail" from the Web server to the new URL?

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  • Motivation for service layer (instead of just copying dlls)?

    - by BornToCode
    I'm creating an application which has 2 different UIs so I'm making it with a service layer which I understood is appropriate for such case. However I found myself just creating web methods for every single method I have in the BL layer, so the services basically built from methods that looks like this: return customers_bl.Get_Customer_Prices(customer_id); I understood that a main point of the service layer is to prevent duplication of code so I asked myself - well, why not just import the BL.dll (and the DAL.dll) to the other UI, and whenever making a change re-copy the dll files, it might not be so 'neat', but is the all purpose of the service layer to prevent this? {I know something is wrong in my approach, I'm probably missing the importance of service layer, I'd like to get more motivation to create another layer, especially because as it is I found that many of my BL functions ALREADY looks like: return customers_dal.Get_Customer_Prices(cust_id) which led me to ask: was it really necessary to create the BL just because on several functions I actually have LOGIC inside the BL?} so I'm looking for more motivation to creating ONE MORE layer, I'm sure it's not just to make it more convenient that I won't have to re-copy the dlls on changes? Am I grasping it wrong? Any simple guidelines on how to design service layer (corresponding to all the BL layer functions or not? any simple example?) any enlightenment on the subject?

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  • Java desktop programmer starting to learn Android development: how different is it?

    - by Prog
    I'm a Java programmer. All of my experience is on desktop applications, using Swing for the GUI. I spend a lot of time studying OOP, I have decent understanding of OO concepts and I design and program by the OO approach. I'm thinking of starting to learn Android development soon, and I'm wondering how different it is from desktop development. Obviously the GUI libraries will be different (not Swing), but other than that, I want to know if there are significant differences. I will divide this question to two parts: Apart from the GUI libraries, am I still going to use the standard Java libarary I'm used to? Aka same data structues, same utility classes, etc.? If not, what are the main differences between the libraries I'm used to and the libraries I'll be using? How different is Android development in regard to OO design? Are all of the familiar principles, design patterns, techniques and best pratices just as valid and used? Or is OOP and OOD in Android development significantly different than OO in desktop development? To summarize: apart from GUI design, how different is Java Android development than Java desktop development?

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  • SDL_DisplayFormat works, but not SDL_DisplayFormatAlpha

    - by Bounderby
    The following code is intended to display a green square on a black background. It executes, but the green square does not show up. However, if I change SDL_DisplayFormatAlpha to SDL_DisplayFormat the square is rendered correctly. So what don't I understand? It seems to me that I am creating *surface with an alpha mask and I am using SDL_MapRGBA to map my green color, so it would be consistent to use SDL_DisplayFormatAlpha as well. (I removed error-checking for clarity, but none of the SDL API calls fail in this example.) #include <SDL.h> int main(int argc, const char *argv[]) { SDL_Init( SDL_INIT_EVERYTHING ); SDL_Surface *screen = SDL_SetVideoMode( 640, 480, 32, SDL_HWSURFACE | SDL_DOUBLEBUF ); SDL_Surface *temp = SDL_CreateRGBSurface( SDL_HWSURFACE, 100, 100, 32, 0, 0, 0, ( SDL_BYTEORDER == SDL_BIG_ENDIAN ? 0x000000ff : 0xff000000 ) ); SDL_Surface *surface = SDL_DisplayFormatAlpha( temp ); SDL_FreeSurface( temp ); SDL_FillRect( surface, &surface->clip_rect, SDL_MapRGBA( screen->format, 0x00, 0xff, 0x00, 0xff ) ); SDL_Rect r; r.x = 50; r.y = 50; SDL_BlitSurface( surface, NULL, screen, &r ); SDL_Flip( screen ); SDL_Delay( 1000 ); SDL_Quit(); return 0; }

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  • is it okay to use random URLs instead of passwords?

    - by stew
    Is it considered "safe" to use URL constructed from random characters like this? http://example.com/EU3uc654/Photos I'd like to put some files/picture galleries on a webserver that are only to be accessed by a small group of users. My main concern is that the files should not get picked up by search-engines or curious power-users that poke around my site. I've set up an .htaccess file, just to notice that clicking on http://user:pass@url/ links doesn't work well with some browsers/email clients, prompting dialogs and warnings messages that confuse my not-too-computer-savy users.

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  • How to prevent firefox from updating

    - by Larry
    I have firefox 3.6.x in Mint Linux. For physical problems -- eyes and color, I want to keep this version and not do any updates ever to it. I don't know if it is a firefox or linux issue, but nothing seems to work. It should not be rocket scientist enabled. :P This is what I have tried: Update Manager and added to ignore package --firef0x* Fully removed all traces of firefox and reinstalled 3.6.28 In firefox, set the upgrade options (3) of them to unselected and saved. Scanned computer for firef* to insure all traces were removed, to include /usr/bin/firefox. Using Mint Linux 9, otherwise fully upgraded for packages. That's the main things I've done. My major issues is the later versions of that software are almost impossible for me to see.

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  • How to import Exchange calendars in Google Calendar (No Desktop Outlook)

    - by Tonny Madsen
    I would like to import my calendar from my company Exchange 2010 server as a new calendar in my private Google account. The primary use is to easy my planning when at home with my laptop. I already have access to both the Google and Exchange calendars on my Android phone, but the size of the screen makes it rather difficult to plan anything serious. Note that I run OSX on my laptop I would prefer a Internet based solution to any software on my own laptop. I do not want an Outlook add-in I do not want to include the work related events in my main calendar I do not want a mobile solution I can pay for the solution

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  • Zfs Drive config on FreeNas

    - by Martyn
    Couple of related questions. Background: I have a stock of drives lying about that I want to use in a HP Proliant Microserver which has a 4 slot SAS cage with FreeNas. I don't want to spend any more on parts. 1) With Zfs and RAIDZ, how bad would it be to mix 2 x 1TB Seagate Barracudas with 2 x 1TB WD Green drives. The latter Green drives are I believe only 5,400 RPM, but I can't find that info for sure. 2) Which would be better, the above mis-match in a RAIDZ or 2 x 3TB Seagate Barracuda in a mirror. Considering both performance and data security 3) I have a spare 250GB drive and a spare SATA slot (for optical drive, not sure on speed) as well, would that be a performance gain to use that for the ZIL and L2ARC (over just using the main drives). Thanks in advance.

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  • Routing / binding 128 to one server

    - by Andrew
    I have a Ubuntu server with 128 ip's (static external ips 86.xx.xx.16), and I want to crawl pages thru different ip's. The gateway is xx.xxx.xxx.1, the main ip is xx.xxx.xxx.16, and the other 128 ip's are xx.xxx.xxx.129/255. I tried this configuration in /etc/network/interfaces but I doesn't work. It work if I remove the gateway for the aliases eth0:0 and eth0:1. I think this is routing problem. auto lo iface lo inet loopback auto eth0 auto eth0:0 auto eth0:1 iface eth0 inet static address xx.xxx.xxx.16 netmask 255.255.255.128 gateway xx.xxx.xxx.1 iface eth0:0 inet static address xx.xxx.xxx.129 netmask 255.255.255.128 gateway xx.xxx.xxx.1 iface eth0:1 inet static address xx.xxx.xxx.130 netmask 255.255.255.128 gateway xx.xxx.xxx.1 Also, please tell me how to "reset" every changes that I made in networking and routing. Thank you

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  • ubuntu 12.04 installer does not recognize drive partitions

    - by endless forms
    I recently purchased a new HP Pavilion HPE desktop running Windows 7. I am trying to install a dual-boot system with 12.04. However, when I run the LiveCD I only get as far as the "Install" window where you can select the partitions for your drives. On the bottom where it says "device for boot loader installation" I have "/dev/sda" and cannot select any other devices. All the options to change the drives are greyed out, most likely because there are no drives in the window. I partitioned my largest drive using the tools within Windows, then booted into the CD, but nothing shows up. I then used Gparted to change the new space from unallocated to an /ext2, and still nothing shows up. The installer does not recognize anything, but when I go into an Ubuntu session and use the disk utility manager I can see the partitions I made. Anything I do has to be done outside of the installer. I have no files on this new computer, so this is the perfect time to install a parallel OS. I would like avoid completely reinstalling Windows, however. I've been over the forums many times, but all the answers I've found have not worked for me. I also tried flagging the new, empty partition as boot, but that screwed Windows up. Also, the WUBI installer hits the same point and quits. I know that the disk itself is fine because I just made another dual boot system on a Gateway PC. This makes me think something within this computer is preventing the installer from "seeing" the drives. Any help would be much appreciated! Edit in response: The main part of the partitioning window shows no partitions, everything is blank. There is no way to add partitions, and all the buttons are useless. I've tried defragging my drive multiple times, and I also used the same disk to dual-boot another PC with no problems, so it's not the disk, it's definitely the computer.

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  • EXT4 external hard drive for use with multiple systems

    - by EXTdumb
    I recently bought a external hard drive to store some data on. I use Linux but I am not a power user. If I format the drive to EXT4, is it possible for the permissions to ever screw up and I lost access to my data? I will be plugging the drive into several different linux based computers at work and I frequently hop distros on my main home machine. I need to make sure I don't lose any data because I overlooked something. I am not familiar with EXT 3 or 4. So far I have done this : Formatted drive to EXT4 ran gksudo thunar and changed the permissions to my user account and all settings to read/write Wrote all the files I need to the drive I really appreciate any help.

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  • How often do you look for code examples?

    - by Newly Insecure
    I am a comp sci student with several years of experience in C and C++, and for the last few years I've been constantly working with Java/Objective C doing app dev and now I have switched to web dev and am mainly focused on ruby on rails and I came to the realization that (as with app dev, really) I reference other code wayyyy too much. I constantly google functionality for lots of things I imagine I should be able to do from scratch and it's really cracked my confidence a bit. Basic fundamentals are not an issue, I hate to use this as an example but I can run through javabat in both java/python at a sprint - obviously not an accomplishment and but what I mean to say is I have a strong base for the fundamentals I think? I was wondering how often you guys reference other code and does it just boil down to a lack of memorization of intricate tasks on my part? I know what I need to use typically but reference syntax constantly. Would love some advice and input on this, as it has been holding me back pretty solidly in terms of looking for work in this field even though I'm finishing my degree. My main reason for asking is not really about employment, but more that I don't want to be the only guy at a hackathon not hammering out nonstop code and sitting there with 20 google/github tabs open, and I have refrained from attending any due to a slight lack of confidence... tl;dr: I google for code examples for basically ALL semi advanced/advanced functionality, how to fix this and do you do as well?

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  • nVidia 9800 GTX+ X11 fails to initialize. no unity or lightdm

    - by rlemon
    I have just upgraded my work pc to 12.04 (not upgrade, fresh install), installing updates during the install, and after everything has loaded (with no errors) and I restart I get brought to console 1 tty login. Console 7 looks like this: IIRC I did not have to finagle with my drivers on 11.10 to get this card working. If this is in fact a driver bug I will remove this post and submit the bug but i'm not 100% confident that it is. I attempted to run unity --reset and got this: Lastly I tried $ sudo apt-get install nvidia-current which tells me nvidia-current is already the newest version. so I ran $ sudo dpkg-reconfigure nvidia-current which says /usr/sbin/dpkg-reconfigure: nvidia-current is broken or not fully installed. Anything I can try from here would be awesome. Currently the only way to get the system up and running was to shut down, plug one of my monitors into the onboard video, enable the onboard video card from the BIOS, then boot back up (and on my single monitor everything is fine). update So I have been able to boot fresh with the ext card plugged in as long as I don't take the updates with the install. past this if I only install the nvidia drivers (nvidia-current or nvidia-current-updates) from the main server (or canadian) I then get the problems.. My proposal; which I don't know where to look for: Can I try installing the previous version of this driver? In the past, on another machine I had issues with my NIC driver being funky... downgraded to the previous driver and bam everything was merry and well.

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  • Can I manually add a thumbnail web page to the Chrome homepage?

    - by andygrunt
    Is there a way to manually add a web page to the 8 thumbnails that appear when you open Chrome? I want to add Google Maps for easy access. The Google front page already shows up so I presume the Google Maps page never will as it's a subset of Google (i.e. I get to it via the main Google front page). I know I can add a shortcut to the toolbar but would rather add it as a thumbnail. And while I'm here, is it possible to increase the number of thumbnails that appear? I'm running the release/stable version of Chrome in Windows XP.

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  • How to install Windows 8 boot manager in a different partition?

    - by arnab321
    the last time i installed Windows 7, the boot manager automatically got installed in a small hidden partition, and the main os into another partition. So, formatting the c: won't affect the boot manager. yesterday i wiped and repartitioned my hdd like this: 50mb primary ntfs (meant for boot manager) 100gb primary ntfs (for win 8) 50gb primary ntfs (for win 7) some logical partitions to install ubuntu and other os i installed win 7 and then win 8, and now there is no os choosing menu. system directly boots win 8 and the 50 mb partition is empty. There is a way to boot Windows 7 and even Ubuntu directly from the Windows boot manager with EasyBCD. But How do i put the boot manager in the 50mb partition ?

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  • Workstation Build: Single 2.66ghz i-7 with overclock potential, OR Dual 5520 2.26ghz Xeons?

    - by jdc0589
    There are probably better places to ask this, but I am used to the excellent quality of responses on stack overflow. I am rebuilding my desktop in a few months. Aside from normal lightweight internet usage, I use it to run sqlServer, mySql, 1-2 Ubuntu VMs from time to time, lots of IDE's, and a media server for my PS3. The two possible setups cost the exact same amount (within $50) and would both have 12gb 1333mhz ddr3 ram and a 500gb RAID-0 array (250x2). Now, If I go with a single i-7 920 2.66ghz quadcore, I can easily overclock it to 3ghz, and would have cash leftover to get a 160gb ssd (either the ocz vertex or the 120gb intel) for the main OS/Program install drive. Else, I could get a dual lga1366 motherboard with two e5520 Xeon's (2.26ghz),just use the disks I already have. So, do I go for 8 physical/16 virtual cores at 2.26ghz (No overclocking on server boards) with normal disk I/O, or a 4 physical/8 virtual cores at 3.0ghz with really outstanding disk I/O?

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  • GTK app: How do I create a working indicator with Qt/C++?

    - by hakermania
    I've tried in 2 forums, but I had no luck so far. So, I am using Qt IDE in order to build my application so as to participate to the Ubuntu Showdown contest. In my application, I've done the following: void show_app(MainWindow *data) { //this works fine: app_indicator_set_status(appindicator, APP_INDICATOR_STATUS_PASSIVE); //this crashes the application: data->show(); } void MainWindow::make_indicator() { if(appindicator){ //appindicator has already been created return; } appindicator = app_indicator_new("Format Junkie Indicator", "formatjunkie", APP_INDICATOR_CATEGORY_APPLICATION_STATUS); GtkWidget* showapp_option; GtkWidget* indicatormenu = gtk_menu_new(); GtkWidget* item = gtk_menu_item_new_with_label("Format Junkie main menu"); gtk_menu_item_set_submenu(GTK_MENU_ITEM(item), indicatormenu); showapp_option = gtk_menu_item_new_with_label("Show App!"); g_signal_connect(showapp_option, "activate", G_CALLBACK(show_app), this); gtk_menu_shell_append(GTK_MENU_SHELL(indicatormenu), showapp_option); gtk_widget_show_all(indicatormenu); app_indicator_set_status(appindicator, APP_INDICATOR_STATUS_ACTIVE); app_indicator_set_attention_icon(appindicator, "dialog-warning"); app_indicator_set_menu(appindicator, GTK_MENU (indicatormenu)); } So, basically I am trying to make a simple indicator entry, which, on click, it will hide the indicator and display the application. The indicator can be successfully hidden using the PASSIVE thingy over there, but, during the call data-show();, the application crashes. Any help on what I am doing wrong would be appreciated! Also, please help me to correct this problem I'm facing (alternatively, I will migrate to the old and good tray icon (it works fine in 12.04, anyway) which I can handle very easily and efficiently)

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  • Sound feels to come from far in my headphones [closed]

    - by Rakesh
    I bought new headphones just yesterday. The strange thing is when I hear sound from my headphone I feel like it is coming from far away. Main problem comes in games, when I hear the footsteps of enemies and think he is on the other side of the wall while he is near to me. :D I also heard virtual haircut on youtube . I tried this with my new headphones and HTC desire S earphones. In case of HTC earphones I felt that scissors and electric razor( @ 3:04 ) is too much near to my ear but in case of the headphones I didn't felt such thing. I felt electric razor is almost 6 inches away from my ear. Have you ever encountered such problem? What can I do in this case?

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  • How can I malloc an array of struct to do the following using file operation?

    - by RHN
    How can malloc an array of struct to do the following using file operation? the file is .txt input in the file is like: 10 22 3.3 33 4.4 I want to read the first line from the file and then I want to malloc an array of input structures equal to the number of lines to be read in from the file. Then I want to read in the data from the file and into the array of structures malloc. Later on I want to store the size of the array into the input variable size. return an array.After this I want to create another function that print out the data in the input variable in the same form like input file and suppose a function call clean_data will free the malloc memory at the end. I have tried somthing like: struct input { int a; float b,c; } struct input* readData(char *filename,int *size); int main() { return 0; } struct input* readData(char *filename,int *size) { char filename[] = "input.txt"; FILE *fp = fopen(filename, "r"); int num; while(!feof(fp)) { fscanf(fp,"%f", &num); struct input *arr = (struct input*)malloc(sizeof(struct input)); } }

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  • Hidden bootloader

    - by Jack
    I need a bootloader that will work as described: I want my computer to boot Windows, that is my main OS installed on a primary bootable partition. However, I'd like to have a 2-3 second span with blinking cursor, before Windows starts. If I press any key in that period it should launch Ubuntu from a small Truecrypt-encoded partition, upon providing a correct password. In other words I'm looking for a hidden bootloader that would expose itself only when a key is pressed during a certain time. Do you happen to know anything like that?

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  • JSR 308 Moves Forward

    - by abuckley
    I am pleased to announce a number of recent milestones for JSR 308, Annotations on Java Types: Adoption of JCP 2.8 Thanks to the agreement of the Expert Group, JSR 308 operates under JCP 2.8 from September 2012. There is a publicly archived mailing list for EG members, and a companion list for anyone who wishes to follow EG traffic by email. There is also a "suggestion box" mailing list where anyone can send feedback to the E.G. directly. Feedback will be discussed on the main EG list. Co-spec lead Prof. Michael Ernst maintains an issue tracker and a document archive. Early-Access Builds of the Reference Implementation Oracle has published binaries for all platforms of JDK 8 with support for type annotations. Builds are generated from OpenJDK's type-annotations/type-annotations forest (notably the langtools repo). The forest is owned by the Type Annotations project. Integration with Enhanced Metadata On the enhanced metadata mailing list, Oracle has proposed support for repeating annotations in the Java language in Java SE 8. For completeness, it must be possible to repeat annotations on types, not only on declarations. The implementation of repeating annotations on declarations is already in the type-annotations/type-annotations forest (and hence in the early-access builds above) and work is underway to extend it to types.

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  • How to connect to internet 2 or more pcs with an usb wifi adapter

    - by bhaoahd
    In one pc I have an USB Wifi adapter (Realtek RTL8187L Chipset), from there a 10 meters cable to an outdoor antenna. With that I connect to a public Access Point. Now I want to be able to connect more computers to internet using that same connection that comes from the outdoor antenna, what options do I have to do this? I do have another usb wifi adapter with a small omni antenna, and a router encore ENHWI-G/A. This router can be used as a Wifi AP, but it needs a modem that works with the RJ45 connector. Is there a way I could take internet from the outdoor antenna, and create another AP indoor using that router to "repeat" that wifi that comes from the outdoor antenna? If creating this second AP is not possible, should I use some sort of local network between computers, connect my main PC with the outdoor antenna, and share the connection through the lan? (I would really prefer to have a second AP indoor so I can connect other devices like a Palm, but I am not sure how could this be possible with this router and the usb wifi adapter)

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  • Strange traffic on fresh Ubuntu Server install

    - by Fishy
    I've just installed Ubuntu Server on my home box after becoming partially familiar with it at work and wanting to train up as a Pen Tester. I installed the latest version on a logical partition (the main one contained Win7), and selected none of the extra modules (I think). I installed ngrep and fired it up (along with TCPdump) and immediately saw some strange traffic which I am unable to identify. My pc is sending out UDP packets every couple of seconds to a seemingly random series of IP addresses, all on the same port (47669 - though I did also see it use another port for a while). I watched it do this for about 20 mins, whilst trying to work out why it was doing it. The only other traffic was the odd ARP request for the router and SSDP UPnP broadcasts from the router. Anyone know what this is, or have any advice on how best to find out? Thanks. EDIT: Actually, it's not my box generating the traffic. It's receiving the traffic on that port, from a series of IP addresses, and returning 'port unreachable' messages.

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  • What are the memory-management capabilities of MySQL + JDBC (in light of autonomic computing)?

    - by Adel
    I'm interested in implementing some kind of autonomic-computing functionality using MySQL. By autonomic-computing I mean roughly some failsafe abilities, whereby the application appears to be at least slightly "intelligent" For reference, the main parts of autonomic computing we'd like are the "self-configuring" and "self-healing" features (the other two - "self-optimizing" and "self-protecting", are too abstract/futuristic for us, at this time). Sofor example, if we have a sample Java application that utilizes a MySQL database, we might want to automatically restart the MySQL database if we take up too much memory. Or maybe we want to have the ability to dynamiccally adjust the database memory as needed. So for example, when we start the application the database begins with a 56 Megabyte buffer; but then as we insert so many rows we want to have it automatically jump up to 512 MB, then to 1024, until a max of 4096 MB. Does all of the above suggest that MySQL is too "weak" for the task? Do you suggest using Oracle database? My professor believes that by using Java we can basically make up for any memory-management deficiencies that MySQL has in relation to Oracle DB. I'm new to MySQL , but have experience with Oracle. If all of the above sounds wishy-washy, it is because I'm still fleshing it out. thanks

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