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• Connecting Linux and Windows Amazon EC2 instances through SSH

  - by Allan Baquerizo

  Hej, I have reserved a Linux and a Windows instances in Amazon EC2. I would like to access between each other through SSH. I have installed cygwin (with openssh package) in the Windows instance but I would like to know how shoud I configure it for accessing to the Linux instance and also being accessed from it? Thanks in advance ;)

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• Is it possible to run multiple mongod instances on a single set of database files

  - by 9point6

  We have large multi-gigabyte data sets on which we run very complex queries, for example { $or: [ { id: 30000001, ... }, { id: 30000005, ... }, ..., { id: 30001005, ... } ] } It seems that CPU is actually a bottleneck at this point, so I'd be advantageous to be able to run multiple mongod instances on the same set of database files. We've considered using replica sets to this end, but would prefer to not require the extra disk space simply for CPU reasons.

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• SmoApplication.EnumAvailableSqlServers returns server names but not instance names (but only on one

  - by Matma

  Hi, There are a number of questions about this and a number of possible causes and thus far ive tried them all with no success. situation: i have an app that needs a db to work, onstartup it does a SmoApplication.EnumAvailableSqlServers(false) to get all the instances on the network, shows the user a dropdown, they pick one and i go connect to my db on that server. all good problem: this works on my machine, the guys next to me and others. HOWEVER it doesnt work on one of the tech guys machines (and potentially others). we are all on the same network domain, physically connected (no wireless), all logged on with network user names, all running the same sql express 2005 sp3, though im using win7 the other guys are running xppro. MSSMS on all machines can see all the instances when you select "Browse for more". yet on this one tech guys machine it lists his local instance (since its hardcoded to) and all the network servers, but has no instances names? i.e. .sqlexpress server1 server2 server3 server4 but on my machine and others we get: .sqlexpress server1/sqlexpress server2/sqlexpress server3/sqlexpress server4/sqlexpress the code im using: ' .... some code ' this populates my datatable dtServers = SmoApplication.EnumAvailableSqlServers(False) '.... some code '.... then later i ShowServers(...) Private dtServers As DataTable = Nothing Private Sub ShowServers(ByVal SQLInstance As String) ' Create a DataTable where we enumerate the available servers cmbServer.Items.Clear() cmbDatabase.Items.Clear() ' If there are any (network listed) servers at all If (dtServers.Rows.Count > 0) Then ' Loop through each server in the DataTable For Each drServer As DataRow In dtServers.Rows ' Add the name to the combobox cmbServer.Items.Add(drServer("Server") & "\" & drServer("Instance")) Next End If 'To make life simpler (add the local instance of sql express): cmbServer.Items.Add(SQLInstance) ' select first item If cmbServer.Items.Count > 0 Then cmbServer.SelectedIndex = 0 End If End Sub now i know this uses udp and its not 100%, but how come his machine is 100% consistent in not showing remote instances, and mine is 100 consistent showing them. even a udl file on his desktop cant see them, regarldess of provider i choose to use? some of the suggestions are to uninstall and re-install, but that doesnt seem like a solution as i (and most others) can see the instances, but one guy cant. this suggests its not the remote sql server but rather the local machine. Notes: ive tried firewall 1433, 1434 i can connect using a udl with full SERVERNAME\INSTANCENAME the browser service is running locally and on the remote machine ive tried stopping and restarting both the browser service on the local and remote machine. Ideas?

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• Major performance difference between two Oracle database instances

  - by jrdioko

  I am working with two instances of an Oracle database, call them one and two. two is running on better hardware (hard disk, memory, CPU) than one, and two is one minor version behind one in terms of Oracle version (both are 11g). Both have the exact same table table_name with exactly the same indexes defined. I load 500,000 identical rows into table_name on both instances. I then run, on both instances: delete from table_name; This command takes 30 seconds to complete on one and 40 minutes to complete on two. Doing INSERTs and UPDATEs on the two tables has similar performance differences. Does anyone have any suggestions on what could have such a drastic impact on performance between the two databases?

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• WPF: Creating instances of resources?

  - by oakskc

  I'm brand spanking new to WPF and am trying to play around with projects to better understand what I'm reading. My understanding of a resource is that it is the instance, you can't use it like a factory and create instances of it. For example, a XAML-defined rectangle. You can reference it, but you can't have numerous instances of it all over the surface. In WPF, what would be the way to do that? If I define a Rectangle as a resource with specific properties and wanted to have multiple instances of that within a dynamically-generated grid, how should I be going about it? Or is there a different way I should be trying to do this? Purely academic exercise with no real-world application.

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• how to access child instances in a vector in c++

  - by tsubasa

  I have a parent class and child class (inherited from parent). In the child class, I have a member function named function_blah(); I used vector<parent*> A to store 5 parent instances, 3 child instances. So the total number of elements in the vector is 8. I can easily access to member functions of element A[0] to A[4], which are parent instances. But whenever I try to have access to member functions of element A[5] to A[7], the compiler complains that class parent has no member named 'function_blah' The way I access to elements is using index. e.x A[i] with i = 0..7. Is it correct? if not, how?

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• Sharing data between two instances in a load balanced java web application

  - by rabbit

  I want to cache data in a java web application deployed on multiple instances. We are using spring 2.5.6. What is the easiest caching library to configure and use with spring? I have heard of EH Cache, but the configuration is too cumbersome. The requirement is that a spring scheduler will run and set some flags. These flags are accessible from all load balanced instances. But since the scheduler runs only on one instance the flag is set only on that jvm. So how do i make these updated flag values available to all load balanced instances?

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• Execute .sh script on ec2 instances without rebooting

  - by waigani

  I currently keep my app code on S3 and have a startup.sh script which is fired via /etc/rc.local and installs the apps and any edits etc. Thus when I make a change, I need to reboot all my instances for the change to take effect. Is there a way to trigger the script without rebooting the instance? EDIT: I do not want to individually log into all my instances. I would prefer a method that I can script up to apply to all my instances at once - which are in an autoscaling group.

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• Nginx and multiple wordpress instances with fastcgi under same domain

  - by damnsweet

  My site is running on apache. two instances of wordpress exist under paths /tr/ and /eng/. I want to move the setup to nginx but could not manage to get it working. My setup consists of nging 0.7.66, php 5.3.2, and php-fpm. /tr/ and /eng/ are two separate wordpress instances located under /home/istci/webapps/wordpress_tr and /home/istci/webapps/wordpress respectively. Below is the server section from nginx.conf containing only configuration for tr, yet could not get it working either. server { listen 80; server_name www.example.com; charset utf-8; location ~ ^/$ { rewrite ^(.+)$ http://www.example.com/tr/ permanent; } location ~ /tr/.*php$ { fastcgi_pass unix:/home/istci/var/run/wptr.sock; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME /home/istci/webapps/wordpress_tr$fastcgi_script_name; fastcgi_param QUERY_STRING $query_string; fastcgi_param REQUEST_METHOD $request_method; fastcgi_param CONTENT_TYPE $content_type; fastcgi_param CONTENT_LENGTH $content_length; fastcgi_param SCRIPT_NAME $fastcgi_script_name; fastcgi_param REQUEST_URI $request_uri; fastcgi_param DOCUMENT_URI $document_uri; fastcgi_param DOCUMENT_ROOT $document_root; fastcgi_param SERVER_PROTOCOL $server_protocol; fastcgi_param GATEWAY_INTERFACE CGI/1.1; fastcgi_param SERVER_SOFTWARE nginx/$nginx_version; fastcgi_param REMOTE_ADDR $remote_addr; fastcgi_param REMOTE_PORT $remote_port; fastcgi_param SERVER_ADDR $server_addr; fastcgi_param SERVER_PORT $server_port; fastcgi_param SERVER_NAME $server_name; # required if PHP was built with --enable-force-cgi-redirect fastcgi_param REDIRECT_STATUS 200; } location /tr/ { root /home/istci/webapps/wordpress_tr/; index index.php index.html index.htm; if (!-e $request_filename) { rewrite ^(.+)$ /tr/index.php?q=$1 last; break; } if (-f $request_filename) { expires 30d; break; } } } php-fpm listens on unix:/home/istci/var/run/wptr.sock. running it in debug-mode shows no active handlers, which means no connection is made to unix socket from nginx. nginx access logs: 127.0.0.1 - - [09/Jun/2010:03:45:11 -0500] "GET /tr/ HTTP/1.0" 404 20 "-" "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.4) Gecko/20100527 Firefox/3.6.4" nginx debug logs : 2010/06/09 03:38:53 [notice] 6922#0: built by gcc 4.1.2 20080704 (Red Hat 4.1.2-48) 2010/06/09 03:38:53 [notice] 6922#0: OS: Linux 2.6.18-164.9.1.el5PAE 2010/06/09 03:38:53 [notice] 6922#0: getrlimit(RLIMIT_NOFILE): 4096:4096 2010/06/09 03:38:53 [notice] 6923#0: start worker processes 2010/06/09 03:38:53 [notice] 6923#0: start worker process 6924 2010/06/09 03:38:53 [notice] 6923#0: start worker process 6925 2010/06/09 03:39:01 [notice] 6925#0: *1 "^(.+)$" matches "/tr/", client: 127.0.0.1, server: www.example.com, request: "GET /tr/ HTTP/1.0", host: "www.example.com" 2010/06/09 03:39:01 [notice] 6925#0: *1 rewritten data: "/tr/index.php", args: "q=/tr/", client: 127.0.0.1, server: www.example.com, request: "GET /tr/ HTTP/1.0", host: "www.example.com" Any clues about what is wrong with my configuration? Thanks.

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• Navigate to a virtual member from an overriden member in the derived type

  - by axrwkr

  Using visual studio, in the editor window, I am able to navigate from the usage of a member to the line and file where it is declared by pressing F12 while the cursor is over that member by or right clicking on the member and selecting "Go To Definition". I would like to find a way to navigate from an override member to the base class member that it overrides. For example, if I have the following class with one method public class SomeClass { public virtual void TheMethod() { // do something } } An I override that method somewhere else in the project or solution similar to the following public OtherClass : SomeClass { public override void TheMethod() { // do something else } } I want to navigate from the declaration of TheMethod in OtherClass to the declaration of TheMethod in SomeClass Is there a way to do this? I've found that I can find the definition of the member in the base class by pressing Shift + F12 (Find all References) and then looking through the list occurances, this works fine most of the time, since the list isn't usually that long but it would be much better to have a way to go there directly.

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• Most efficient way to update attribute of one instance

  - by Begbie00

  Hi all - I'm creating an arbitrary number of instances (using for loops and ranges). At some event in the future, I need to change an attribute for only one of the instances. What's the best way to do this? Right now, I'm doing the following: 1) Manage the instances in a list. 2) Iterate through the list to find a key value. 3) Once I find the right object within the list (i.e. key value = value I'm looking for), change whatever attribute I need to change. for Instance within ListofInstances: if Instance.KeyValue == SearchValue: Instance.AttributeToChange = 10 This feels really inefficient: I'm basically iterating over the entire list of instances, even through I only need to change an attribute in one of them. Should I be storing the Instance references in a structure more suitable for random access (e.g. dictionary with KeyValue as the dictionary key?) Is a dictionary any more efficient in this case? Should I be using something else? Thanks, Mike

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• sizeof derived already from base

  - by Oops

  Hi, is it possible to return the sizeof a derived class already from base class/struct? imho the size of a class is a kind of property of itself, like the weight of a human being. But I don't want to write the same function in every class. many thanks in advance Oops

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• Hide a base class method from derived class, but still visible outside of assembly

  - by clintp

  This is a question about tidyness. The project is already working, I'm satisfied with the design but I have a couple of loose ends that I'd like to tie up. My project has a plugin architecture. The main body of the program dispatches work to the plugins that each reside in their own AppDomain. The plugins are described with an interface, which is used by the main program (to get the signature for invoking DispatchTaskToPlugin) and by the plugins themselves as an API contract: namespace AppServer.Plugin.Common { public interface IAppServerPlugin { void Register(); void DispatchTaskToPlugin(Task t); // Other methods omitted } } In the main body of the program Register() is called so that the plugin can register its callback methods with the base class, and then later DispatchTaskToPlugin() is called to get the plugin running. The plugins themselves are in two parts. There's a base class that implements the framework for the plugin (setup, housekeeping, teardown, etc..). This is where DispatchTaskToPlugin is actually defined: namespace AppServer.Plugin { abstract public class BasePlugin : MarshalByRefObject, AppServer.Plugin.Common.IAppServerPlugin { public void DispatchTaskToPlugin(Task t) { // ... // Eventual call to actual plugin code // } // Other methods omitted } } The actual plugins themselves only need to implement a Register() method (to give the base class the delegates to call eventually) and then their business logic. namespace AppServer.Plugin { public class Plugin : BasePlugin { override public void Register() { // Calls a method in the base class to register itself. } // Various callback methods, business logic, etc... } } Now in the base class (BasePlugin) I've implemented all kinds of convenience methods, collected data, etc.. for the plugins to use. Everything's kosher except for that lingering method DispatchTaskToPlugin(). It's not supposed to be callable from the Plugin class implementations -- they have no use for it. It's only needed by the dispatcher in the main body of the program. How can I prevent the derived classes (Plugin) from seeing the method in the base class (BasePlugin/DispatchTaskToPlugin) but still have it visible from outside of the assembly? I can split hairs and have DispatchTaskToPlugin() throw an exception if it's called from the derived classes, but that's closing the barn door a little late. I'd like to keep it out of Intellisense or possibly have the compiler take care of this for me. Suggestions?

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• Java; casting base class to derived class

  - by incrediman

  Why can't I cast a base class instance to a derived class? For example, if I have a class B which extends a class C, why can't I do this? B b=(B)(new C()); or this? C c=new C(); B b=(B)c;

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• blank to numeric conversion derived column

  - by praveen

  Hi All, I have a source column with blank (not "NULL"), and target as numeric. while converting using the data conversion it is not converting due to balnk source value so I used derived column to replace a blank value with NULL or 0 as (source column == " ") ? "0" : source column but its not giving the value as 0 in the blank place. thanks prav

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• Objects of the same name in base and derived class not getting flagged as an error

  - by John Smith

  class Base { public: type1 m_Pants; }; class Derived : Base { public: type2 m_Pants }; This essentially didn't get flagged as an error, but was creating all kinds of clobbering and issues throughout a project. Does anyone know of a technicality that wouldn't flag this?

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• Abstract base class to force each derived classes to be Singleton

  - by this. __curious_geek

  How do I make an abstract class that shall force each derived classes to be Singleton ? I use C#.

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• Get derived class type from a base's class static method

  - by Marco Bettiolo

  Hi, i would like to get the type of the derived class from a static method of its base class. How can this be accomplished? Thanks! class BaseClass { static void Ping () { Type t = this.GetType(); // should be DerivedClass, but it is not possible with a static method } } class DerivedClass : BaseClass {} // somewhere in the code DerivedClass.Ping();

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• What is the best way to create derived properties

  - by user342788

  I have a datamodel with to-many to-many relations. Using the example of employee database let say the entity division is related to department which in turn is related to employee. The employee has an attribute salary. How best to have a attribute at the level of division which is derived from the salary attribute. For example average salary or maximum salary. I would need those attributes to sort the list of departments.

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• How to open a pdf or a djvu on an specific instance of a document viewer?

  - by ciro

  I want using any free Linux document viewer that does both pdf and djvu (Okular, Evince, etc.) to do the following: magic_command('document-viewer','./11.pdf','instance1') magic_command('document-viewer','./21.djvu','instance2') two instances (windows) of document-viewer are opened one with 11.pdf and the other with 21.djvu then: magic_command('document-viewer','./12.djvu','instance1') magic_command('document-viewer','./22.pdf','instance2') the first instance (window) of document-viewer loads 12.djvu the second instance (window) of document-viewer loads 22.pdf

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• Canonical configuration for multiple-instance Postfix?

  - by threecheeseopera

  I recently attempted to reconfigure an existing single-instance Postfix server (multi-homed) to support multiple MTA instances, but failed miserably (read: open relay, nastygram from ISP). It appears that there are several methods that can be used to accomplish this, and the various (and numerous) secondary sources that I found online were 'all over the map' with respect to which they used/glued together. Can anyone provide a working configuration (or tips) that use postmulti to manage a multi-instance Postfix setup?

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• Unable to terminate extra EC2 instances

  - by Deborah Cole

  I'm just setting up my AWS server & I'm trying to use the EC2 Console to terminate some extra instances that I generated via the AWS for Eclipse toolkit's New Project AWS Java Web Project utility. Unfortunately, every time I stop, then terminate such an instance via the EC2 Console, it automatically recreates & reactivates itself! I really don't want to be paying for 4 dev systems when I only need 1, so can somebody please clue me in? Please explain gently... I'm new to this environment.

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• Apache, and logrotate instances

  - by OlivierDofus

  Hi! If I have one website and I want to rotate its logs, there's one instance of logrotate that is launched. There are as many logrotate instances launched as they are virtual websites. Here you can find mod_log_rotate, with a 1.3 version and (only) 2.0 version: http://www.hexten.net/wiki/index.php/Mod-log-rotate It's 6 years old. Is there something new, or maybe is there something like that in recent Apache versions? I didn't find anything like that, and I don't know if this code is still "usable" for recent Apache versions (2.2.x) Don't hesitate to edit my post to make it proper English, thanks a lot!

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• Automatically Snapshoting AWS instances (or other back up strategy)

  - by user1172468

  I just realized that my aws instance count has risen into the double digits. I'm currently backing portions of my folders and dbs and moving them off to a backup instance. What I think I should be doing is taking a snapshot of the instances (automatically) and persisting them on S3 so I have a running 7 day collection of daily backups. There is a question asking the same thing here, however the answers don't go into depth. So the closest answer seems to be: use a cron job to snapshot the instance. So do I run the cron job on the instance itself? or do I have a micro instance to run these snapshots? Could I get an example script or the command for say a linux flavor? what software must I have installed to get this to run? Thanks.

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• Text Editor that hilights all instances of selection for Mac

  - by jedierikb

  On Windows, I use Notepad++ which has the great feature of when I select a word, all instances of that word are also highlighted in the same document. I have found it very helpful for finding patterns in giant log files. I am wondering if there is a similar feature in a text editor on the Mac. I have looked into the documentation for TextWrangler and TextMate to no avail. Hopefully there is a way to do this so I can be more productive when working on a Mac. -- Note: in Notepad++ you do not have to do a keyboard shortcut to make this work... you just select some text and it does the highlighting for you automatically.

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