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• How do I scale EC2 and push out code / data to my instances?

  - by chris

  Unfortunately I only have a limited knowledge of server architecture, I come from a development background. I am looking to ensure my new app can scale properly using EC2. I currently have a T1.micro for development running Windows with SQL server 2008. The system allows students to come to our site to search for a mentor, update their profile with pictures and employment history etc. Roughly the same sort of work as a LinkedIn profile. I need this to be able to scale very quickly without wasted resources. I understand the following is important. Separation of data, application etc. I will achieve this I think by hosting images using S3, Database instance via RDS and upgrade the EC2 instance. My main question is: How do I push data / code out to multiple ec2 / RDS instances seamlessly?

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• iPhone Encryption Standard - Will this implementation bye-pass apple check?

  - by Futur

  Hi All, I found this implementation, and i am not sure whether we can use this implementation and apple will bye-pass extra check, this is a base-64 implementation. The source code link is http://blog.objectgraph.com/wp-content/uploads/2010/04/CryptTest.zip The web page link is : http://blog.objectgraph.com/index.php/2010/04/20/encrypting-decrypting-base64-encode-decode-in-iphone-objective-c/ Kindly advice me friends.

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• How do I get all the calendar entries for a particular time range using Google Calendar API

  - by BeWarned

  I want to view events over specific time range for a specific calendar, but am having trouble using the API, It is a generic API, and it reminds me of using the DOM. The problem is that it seems difficult to work with because much of the information is in generic base classes. How do I get the events for a calendar using Groovy or Java? Does anybody have an example of passing credentials using curl? Example code would be appreciated.

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• How Can I test my website using selemium Grid?

  - by prakash.panjwani

  Hello sir, I want to use selenium grid for my web page testing. I have successfully installed the demo of selenium grid on my PC and it is running fine. Now I want to run the test for my web site,but I am not getting how can I do that. Can some body give some example so that I will do that.I am a newer with selenium. I do not know much about selenium and Ant. Please help me . (I have basic knowledge about java.) Thanks In Advance

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• Simple mail server setup for a user-based website.

  - by Absolute0

  I am working on a simple website that has user registration. All I need to do is confirm email addresses by emailing a confirmation email and maybe send out periodic emails regarding various information. I am also considering having a [email protected] email for user questions and comments. The application is written in django and I am running it on ArchLinux on a VPS. I have no knowledge of mail servers. I tried setting up postfix and qmail but had no luck. They are complicated and require a lot of configuration to get them working properly. My use case is super simple and doesn't not require anything fancy. Is there any simple mailing setup that will enable me to quickly get emailing working with my django app with minimal work?

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• Raid 5 scsi fault

  - by HaLaBi

  I have no much knowledge about servers and I was looking all day around the internet about finding a solution to my raid 5 problem. All of a sudden two disks failed. The server won't boot (HP Proliant, windows 2003 R2, very old maybe 10 years old). I know that if one disk is faulty then I can add a new disk and rebuild it and things will be fine, the problem is two went faulty :( is this normal? two at the same time? is there any other thing I can do and I am not aware of? other than taking them out and reinserting them back? Windows won't boot. The Array menu shows that disks 0 and 4 are "Missing". Any other tricks or things to do? It is important because for some unknown reason the back up job did not work for a month and I just found out, so I need to make these raid 5 back online again.

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• Hack/software to easily move screen mapping of a wacom tablet?

  - by Riyaah

  I would like to move/manipulate the mapping of my Wacom tablet to my screen as easily as with Inklet: http://tenonedesign.com/inklet.php Is anyone aware of any software or hack to acheive this on Mac OS X? If not I'm thinking about trying to write a script that centers the mapping on the current cursor position, and then bidning that to a button on my tablet. Combined with a script for toggling between fullscreen/part of screen-mapping that should be enough. My idea so far is to edit the .prefs file since it's plain XML, and then restart the tablet driver. But any pointers relating to this would be most welcome, since my knowledge of this kind of things is rudimentary.

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• Start TLS and 389 Directory

  - by Kyle Flavin

  I'm trying to configure Start TLS on 389 Directory server, but I'm having all sorts of issues. I've been following this doc: https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Directory_Server/9.0/html/Administration_Guide/managing-certs.html which specifies that I should create a certificate for both the directory server and admin server. I've imported the CA cert on both servers. I've tried to use the same server certificate for both. It will not allow me to do so. However, the admin and directory servers reside on the same host. If I generate a new certificate it will need to use the same hostname. I'm not sure if that's valid... Has anyone out there set this up before? Any direction would be helpful. I have multmaster replication set up. From an external client, I'm attempting to do an ldapsearch -ZZ -x -h "myhost" -b "dc=example,dc=com" -D "cn=Directory Manager" -W "", and I'm getting a protocol error.

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• ESXI with non standard hardware HDD issues

  - by Hurricanepkt

  I have 3 very underutilized servers that I am condensing to one of those shuttle PC's with VMWare ESXi The HDD seems to be the bottle neck right now (the light is almost always pure solid) right now I have a single 1TB Seagate 7200.11 connected by SATA. VMWare ESXi cannot detect it when running in AHCI mode, but does when running in IDE mode. I have read that IDE mode can give a 5% performance hit which might give me enough breathing room. However, I am open to setting up an external eSATA or some sort of raid to give me more than just the 5%. I am just weary of sinking some money into a bit of hardware without knowledge of whether it will work. Does anyone know of resources or procedures of how to get this working.

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• How to test ActiveRecord callacks with RSpec?

  - by FoxDemon

  How to test the following example? class Post < ActiveRecord::Base belongs_to :discussion def after_save # or after_create discussion.touch end end

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• Implementing In App purchases in Android?

  - by hgpc

  It looks like Android won't natively support in-app purchases for a while, and when it does there might be a huge user base with devices that don't support them. What's the best way to implement iPhone-like (additional content or services) in-app purchases in Android using the Android Market if possible? The solution should consider in particular: For all kinds of in-app purchases: Android Market's 24-hour cancellation policy For consumables/non-consumables: storage of additional content (ie: use precious application memory to avoid piracy, or use SD card to avoid bloating application memory) Thanks!

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• How to draw N first elements?

  - by noober

  Hello all, There is a canvas element with 10 children (polygons). There is a number in my code from 1 to 10. I'd like to draw the first N elements from the children elements, base on my number. It would be the best solution to do this from XAML with a minimum code-behind like this: ... MyCanvas.N = 5; ...

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• Is there an ActiveRecord equivalent to using a nested subquery i.e. ... where NOT IN(select...) ?

  - by Snorkpete

  I have 3 models: Category, Account, and SubAccount The relations are: Accounts has_many :sub_accounts Categories has_many :sub_accounts I wanted to get a list of all Categories that are not used by a given account. My method in the Category model currently looks like: class Category < ActiveRecord::Base def self.not_used_by(account) Category.find_by_sql("select * from categories where id not in(select category_id from sub_accounts where account_id = #{account.id})") end end My question is, is there a cleaner alternative than using SQL? NB. I am currently using Rails 3(beta)

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• NHibernateUnitOfWork + ASP.Net MVC

  - by Felipe

  Hi Guys, hows it going? I'm in my first time with DDD, so I'm begginer! So, let's take it's very simple :D I developed an application using asp.net mvc 2 , ddd and nhibernate. I have a domain model in a class library, my repositories in another class library, and an asp.net mvc 2 application. My Repository base class, I have a construct that I inject and dependency (my unique ISessionFactory object started in global.asax), the code is: public class Repository<T> : IRepository<T> where T : Entidade { protected ISessionFactory SessionFactory { get; private set; } protected ISession Session { get { return SessionFactory.GetCurrentSession(); } } protected Repository(ISessionFactory sessionFactory) { SessionFactory = sessionFactory; } public void Save(T entity) { Session.SaveOrUpdate(entity); } public void Delete(T entity) { Session.Delete(entity); } public T Get(long key) { return Session.Get<T>(key); } public IList<T> FindAll() { return Session.CreateCriteria(typeof(T)).SetCacheable(true).List<T>(); } } And After I have the spefic repositories, like this: public class DocumentRepository : Repository<Domain.Document>, IDocumentRepository { // constructor public DocumentRepository (ISessionFactory sessionFactory) : base(sessionFactory) { } public IList<Domain.Document> GetByType(int idType) { var result = Session.CreateQuery("from Document d where d.Type.Id = :IdType") .SetParameter("IdType", idType) .List<Domain.Document>(); return result; } } there is not control of transaction in this code, and it's working fine, but, I would like to make something to control this repositories in my controller of asp.net mvc, something simple, like this: using (var tx = /* what can I put here ? */) { try { _repositoryA.Save(objA); _repositoryB.Save(objB); _repositotyC.Delete(objC); /* ... others tasks ... */ tx.Commit(); } catch { tx.RollBack(); } } I've heared about NHibernateUnitOfWork, but i don't know :(, How Can I configure NHibernateUnitOfWork to work with my repositories ? Should I change the my simple repository ? Sugestions are welcome! So, thanks if somebody read to here! If can help me, I appretiate! PS: Sorry for my english! bye =D

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• Why would it be necessary to subclass from object in Python?

  - by rmh

  I've been using Python for quite a while now, and I'm still unsure as to why you would subclass from object. What is the difference between this: class MyClass(): pass And this: class MyClass(object): pass As far as I understand, object is the base class for all classes and the subclassing is implied. Do you get anything from explicitly subclassing from it? What is the most "Pythonic" thing to do?

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• Chrome opens to untitled blank page

  - by jackncoke

  I am working on a computer that had a lot of malware on it. I removed most of it to my knowledge. Now when I open Google Chrome I get a blank untitled page, with the traditional sign-in URL on top. If I go to the settings, the settings tab opens up blank as well. All pages that I navigate to will come up blank as well. The browser doesn't even perform a postback, it is like it is unresponsive. I did some googling and have seen people with similar errors, but no fixes. IE 8 works great without issues. Re-installing Chrome was the first thing I did! Any suggestions?

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• WebClient and Gzip compression is faster?

  - by Yozer

  I writting an application which is using WebClient class. Adding something like that: ExC.Headers.Add("Accept-Encoding: gzip, deflate"); where ExC is: class ExWebClient1 : WebClient { protected override WebRequest GetWebRequest(Uri address) { HttpWebRequest request = (HttpWebRequest)base.GetWebRequest(address); request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate; return request; } } It will be a diffrence in speed when i will be using encoded response?

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• Running single integration test quickly in Grails

  - by Prakash

  Is it possible to quickly run single/all integration test in a class quickly in Grails. The test-app comes with heavy baggage of clearing of all compiled files and generating cobertura reports hence even if we run single integration test, the entire code base is compiled,instrumented and the cobertura report is getting generated. For our application this takes more than 2 minutes. If it was possible to quickly run one integration test and get a rapid feedbck, it would be immensely helpful. Thanks

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• Connect macbook to my LAN through a VPN - best solution? [closed]

  - by LewisMc

  So I have a LAN connected via a ADSL/PPPoA, this is using a bog-standard DLink router supplied by my ISP (talktalk UK). I have a NAS within the LAN that is running FreeNAS and I want to be able to connect to it when I'm out and about. It's running an atom so it's quite low on juice consumption but I don't want to have it on all day and night so I've been waking it via a magic packet and booting it down from the web admin when I need it. So I want to connect to the LAN, I presume via a VPN, to be able to send a magic packet. But what is the best method to accomplish this, or is there an easier way? I've been looking at the cisco 857 integrated router and the Netgear prosafe 318(behind modem) but not sure If I'm on the right track with what I want to achieve as I've not much experience or knowledge with VPN's or networking (software engineering student). I have tried port forwarding but to no avail, either with magic packets or even connecting outside the LAN via DYNDNS. Thanks,

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• Working with nested models in ROR

  - by user487429

  Hi there, I'm trying to create an application where users can freely create shops and associated shop item for a specific shop is displayed when a show action is called but I seem to be doing something wrong. Any help here will be appreciated. I have attached shots of my code below. class ShopItem < ActiveRecord::Base belongs_to :shop def self.find_shop_items_for_sale find(:all, :order => "title", :conditions => ["shop_id = ?", @shop.id]) end end class Shop < ActiveRecord::Base has_many :shop_items end #Controllers class ShopsController < ApplicationController def new @shop = Shop.new end def create @shop = Shop.new(params[:shop]) @shop.user_id = current_user.id respond_to do |format| if @shop.save flash[:notice] = "Successfully created shop." format.html {redirect_to(all_shops_shops_url)} format.xml {render :xml => @shop, :status => :created, :location => @shop } else format.html {render :action => 'new'} format.xml { render :xml => @shop.errors, :status => :unprocessable_entity } end end end def show @shop = Shop.find(params[:id]) @shop_items = ShopItem.find_shop_items_for_sale @shop_cart = find_shop_cart end class ShopItemsController < ApplicationController def user @per_page ||= 5 @user = User.find(params[:id]) @shop_items = ShopItem.find(:all, :conditions=>["user_id = ?", @user.id], :order=>"id desc") end def show @shop_item = ShopItem.find(params[:id]) @shop = @shop_item.shop respond_to do |format| format.html # show.html.erb format.xml { render :xml => @shop_item } end end # GET /shop_items/new # GET /shop_items/new.xml def new @shop_item = ShopItem.new @shop = Shop.find(params[:id]) #@shop_items = ShopItem.paginate(:all, :condition=>["shop_id] = ?", @shop.id], :order=> "id desc", :page => params[:page],:per_page => @per_page) @shop_items = ShopItem.find(:all, :conditions=>["shop_id = ?", @shop.id], :order=> "id desc") @shop_item.shop_id = params[:id] respond_to do |format| format.html # new.html.erb format.xml { render :xml => @shop_item } end end # GET /shop_items/1/edit def edit @shop_item = ShopItem.find(params[:id]) end # POST /shop_items # POST /shop_items.xml def create @shop_item = ShopItem.new(params[:shop_item]) @shop_item.user_id = current_user.id respond_to do |format| if @shop_item.save flash[:notice] = 'Shop item was successfully created.' format.html { redirect_to(@shop_item) } format.xml { render :xml => @shop_item, :status => :created, :location => @shop_item } else @shop = Shop.find(@shop_item.shop_id) #@shop_items = ShopItem.paginate(:all, :condition =>["shop_id = ?", @shop.id], :order=> "id desc" , :page => params[:page], :per_page => @per_page) @shop_items = ShopItem.find(:all, :conditions =>["shop_id = ?", @shop.id], :order=> "id desc") format.html { render :action => "new" } format.xml { render :xml => @shop_item.errors, :status => :unprocessable_entity } end end end

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• Windows Home Server restore causes computer to be removed from the domain?

  - by unknown (google)

  I restored my Dell M4400 that is a company laptop, and now I get an error when I try to log on and am connected to our corporate network, which says that the domain controller could not be found or that the computer is not part of the domain. Everyone else can log on, so it seems my computer is no longer part of the domain, even though it thinks it is per the settings. One thing of note: my computer crashed on 1/14/10, but I restored from a backup that was made on 12/20/09. So I am not sure if that made a difference? Also, I tried running "gpupdate" to update my group policy, but that did not seem to help. Any ideas? Seems like a bit of a flaw in the backup system for computers that are part of a domain. I guess I wanted to hear from someone with more knowledge about how a computer is recognized as part of a domain to know if this should be expected when doing a restore or if I should file a trouble ticket.

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• add_without_safety create new DB entry in controller

  - by Karl Entwistle

  Im trying to get a controller to create a new account with the user id filled in, this doesn't work in my controller or in the console, why? Any suggestions on how to implement this would be much appreciated. class PaymentNotification < ActiveRecord::Base after_create :add_account_to_market private def add_account_to_market if status == "Completed" line = LineItem.find(:first, :conditions => { :cart_id => cart.id }) line.quantity.times do Account.new(:user_id => cart.user_id) end end end end

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• Generate navigation from a multi-dimensional array

  - by rg88

  The question: How do I generate navigation, allowing for applying different classes to different sub-items, from a multi-dimensional array? Here is how I was doing it before I had any need for multi-level navigation: Home Pics About and was generated by calling nav(): function nav(){ $links = array( "Home" => "home.php", "Pics" => "pics.php", "About" => "about.php" ); $base = basename($_SERVER['PHP_SELF']); foreach($nav as $k => $v){ echo buildLinks($k, $v, $base); } } Here is buildLinks(): function buildLinks($name, $page, $selected){ if($selected == $page){ $theLink = "<li class=\"selected\"><a href=\"$page\">$name</a></li>\n"; } else { $thelink = "<li><a href=\"$page\">$name</a></li>\n"; } return $thelink; } My question, again: how would I achieve the following nav (and notice that the visible sub navigation elements are only present when on that specific page): Home something1 something2 Pics About and... Home Pics people places About What I've tried From looking at it it would seem that some iterator in the SPL would be a good fit for this but I'm not sure how to approach this. I have played around with RecursiveIteratorIterator but I'm not sure how to apply a different style to only the sub menu items and also how to only show these items if you are on the correct page. I built this array to test with but don't know how to work with the submenu1 items individually: $nav = array( array( "Home" => "home.php", "submenu1" => array( "something1"=>"something1.php", "something2" => "something2.php") ), array("Pics" => "pics.php"), array("About" => "about.php") ); The following will print out the lot in order but how do I apply, say a class name to the submenu1 items or only show them when the person is on, say, the "Home" page? $iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($nav)); foreach($iterator as $key=>$value) { echo $key.' -- '.$value.'<br />'; }

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• Rails nested form for belongs_to

  - by user1232533

  I'm new to rails and have some troubles with creating a nested form. My models: class User < ActiveRecord::Base belongs_to :company accepts_nested_attributes_for :company, :reject_if => :all_blank end class Company < ActiveRecord::Base has_many :users end Now i would like to create a new company from the user sign_up page (i use Devise btw) by given only a company name. And have a relation between the new User and new Company. In the console i can create a company for a existing User like this: @company = User.first.build_company(:name => "name of company") @company.save That works, but i can't make this happen for a new user, in my new user sign_up form i tried this (i know its wrong by creating a new User fist but im trying to get something working here..): <%= simple_form_for(resource, :as => resource_name, :html => { :class => 'form-horizontal' }, :url => registration_path(resource_name)) do |f| %> <%= f.error_notification %> <div class="inputs"> <% @user = User.new company = @user.build_company() %> <% f.fields_for company do |builder| %> <%= builder.input :name, :required => true, :autofocus => true %> <% end %> <%= f.input :email, :required => true, :autofocus => true %> <%= f.input :password, :required => true %> <%= f.input :password_confirmation, :required => true %> </div> <div class="form-actions"> <%= f.button :submit, :class => 'btn-primary', :value => 'Sign up' %> </div> I did my best to google for a solution/ example.. found some nested form examples but it's just not clear to me how to do this. Really hope somebody can help me with this. Any help on this would be appreciated. Thanks in advance! Greets, Daniel

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• Accessing to shared folders with OpenVPN

  - by Ergec

  This is my first attempt to configure a vpn so I have very little knowledge about this. Network where centos server is having local IPs 192.168.123.* Network where windows machine is having local IPs 192.168.1.* I installed and configured my openpvn server on centos 5 and client on a windows machine. Generated all keys, certificates e.t.c and transferred them to client and I'm able to connect to server. Below there is a screenshot of the client log. Also on server side I can also see incoming packets with this command tcpdump -n port 1723 So I assume I did most of the things correct. But still when I try to open shared folders using \\192.168.123.33 or \\network-name I can't access folders

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