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• central apache log analysis of many hosts

  - by Jason Antman

  We have 30+ apache httpd servers, and are looking to perform analysis on the logs both for historical trending and near "real time" monitoring/alerting. I'm mainly interested in things like error rates (4xx/5xx), response time, overall request rate, etc. but it would also be very useful to pull out more compute-intensive statistics like unique client IPs and user agents per unit of time. I'm leaning towards building this as a centralized collector/server/storage, and am also considering the possibility of storing non-apache logs (i.e. general syslog, firewall logs, etc.) in the same system. Obviously a large part of this will probably have to be custom (at least the connection between pieces and the parsing/analysis we do), but I haven't been able to find much information on people who have done stuff like this, at least at shops smaller than Google/Facebook/etc. who can throw their log data into a hundred-node compute cluster and run Map/Reduce on it. The main things I'm looking for are: - All open source - Some way of collecting logs from apache machines that isn't too resource-intensive, and transports them relatively quickly over the network - Some way of storing them (NoSQL? key-value store?) on the backend, for a given amount of time (and then rolling them up into historical averages) - In the middle of this, a way of graphing in near-real-time (probably also with some statistical analysis on it) and hopefully alerting off of those graphs. Any suggestions/pointers/ideas, to either "products"/projects or descriptions of how other people do this would be greatly helpful. Unfortunately, we're not exactly a new-age-y devops shop, lots of old stuff, homogeneous infrastructure, and strained boxes.

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• Keypress Left is called twice in Update when key is pressed only once

  - by Simran kaur

  I have a piece of code that is changing the position of player when left key is pressed. It is inside of Update() function. I know, Update is called multiple times, but since I have an ifstatement to check if left arrow is pressed, it should update only once. I have tested using print statement that once pressed, it gets called twice. Problem: Position updated twice when key is pressed only once. Below given is the structure of my code: void Update() { if (Input.GetKeyDown (KeyCode.LeftArrow)) { print ("PRESSEEEEEEEEEEEEEEEEEEDDDDDDDDDDDDDD"); } } I looked up on web and what was suggested id this: if (Event.current.type == EventType.KeyDown && Event.current.keyCode == KeyCode.LeftArrow) { print("pressed"); } But, It gives me an error that says: Object reference not set to instance of an object How can I fix this?

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• Looking for a software / something to automate some simple audio processing

  - by Daniel Magliola

  I'm looking for a way to take a 1-hour podcast MP3 file and split it into several several 2-minute MP3s. Along the way, I'd like to also do a few things like Amplify the volume. The problem I'm solving is that I have a crappy MP3 player that won't let me seek forward or backward, nor will it remember where I left it when I turn it off, plus, I listen to these in a seriously high-noise situation. Thus, I need to be able to skip forward in large chunks (2-5 minutes) to the point where I left it. Is there any decent way to do this? Audacity doesn't seem to have command-line capabilities. I'm willing to write some code, for example, to call something over the command line and get how long the MP3 file is, to later know how many pieces i'll have, and then say "create an MP3 with 0:00 to 2:00", "create an MP3 with 2:00 to 4:00", etc. I'm also willing to pay for the right tools if necessary. I also don't care how slow this runs, as long as I can automate it :-) I'm doing this on Windows. Any pointers / ideas? Thanks!

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• 2d ball collision code problem XNA, over accelerated balls and stick together sometimes. help please? [closed]

  - by Sivan

  public static void Collision(Ball ball1, Ball ball2) { Vector3 x = new Vector3((ball1.BallPosition.X - ball2.BallPosition.X), (ball1.BallPosition.Y - ball2.BallPosition.Y), 0); x.Normalize(); Vector3 v1 = new Vector3(ball1.Speed, 0); float x1 = Vector3.Dot(x, v1); Vector3 v1x = x * x1; Vector3 v1y = v1 - v1x; x = -x; Vector3 v2 = new Vector3(ball2.Speed, 0); float x2 = Vector3.Dot(x, v2); Vector3 v2x = x * x2; Vector3 v2y = v2 - v2x; float m1 = 12, m2 = 4; float combinedMass = m1 + m2; Vector3 newVelA = (v1x * ((m1 - m2) / combinedMass)) + (v2x * ((2f * m2) / combinedMass)) + v1y; Vector3 newVelB = (v1x * ((2f * m1) / combinedMass)) + (v2x * ((m2 - m1) / combinedMass)) + v2y; ball1.Speed = new Vector2(newVelA.X, newVelA.Y); ball2.Speed = new Vector2(newVelB.X,newVelB.Y ); }

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• How to design console application with good seperation of UI from Logic

  - by JavaSa

  Is it considered an overkill for console application to be design like MVC , MVP or N tier architecture? If not which is more common and if you can link me to simple example of it. I want to implement a tic tac toe game in console application. I have a solution which hold two projects: TicTacToeBusinessLogic (Class library project) and TicTacToeConsoleApplication (Console application project) to represent the view logic. In the TicTacToeConsoleApplication I've Program.cs class which holds the main entry point (public static void Main). Now I face a problem. I want the game to handle its own game flow so I can: Create new GameManager class (from BL) but this causing the view to directly know the BL part. So I'm a little confused how to write it in an acceptable way. Should I use delegates? Please show me a simple example.

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• Webcam security camera software that runs as a service

  - by hurfdurf

  I've been looking for Windows webcam software that will run as a Windows service without any user login. The goal is to use the webcam as a cheap security camera and log the results to secure networked storage (windows share, not FTP). The requirements are: Motion detection Video capture Runs as a service (should start recording immediately after reboot) Nice to have: Round-robin storage, e.g. 10Gb limit, oldest files overwritten/deleted when space gets low I've read the other webcam questions but still haven't stumbled across anything suitable. Evaluations thus far: Title MotionDetect Service Snapshots Video SpaceLimit License Yawcam Yes Yes Yes No No GPL WebCam ZoneTrigger Yes No Yes Yes No Commercial Dorgem Yes No Yes Yes No GPL AbelCam Yes No Yes Yes No Commercial Logitech Yes No Yes Yes No Paired with camera IspyConnect Yes No Yes Yes Yes Free SecureCam (SourcefoYes No Yes Yes No GPL AbelCam Yes No Yes Yes No Commercial Active WebCam Yes Yes(?) Yes Yes Volume Free Commercial WebCam Surveyor Yes No Yes Yes No Commercial WebCamsPy NA NA NA NA NA GPL Camera: Logitech Webcam Pro 9000 Windows 7 32-bit WebCamsPy failed to initialize so couldn't be tested So far, the contenders: Active Webcam comes the closest, and claims to run as a service, but i haven't been able to get it to record after a cold boot even though a service is running. Yawcam can be set up as a service but doesn't record video. IspyConnect has exactly the type of space limit I want and looks great, but doesn't run as a service (seems also to be a bit of a cpu hog) Any other suggestions? I'm locked into Windows so can't use linux Motion, which looks almost perfect. Any pointers to rich Windows webcam/motion detection libraries out there that could easily be turned into a command line program would also be appreciated.

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• When JDeveloper IDE doesn't render the visual editor

  - by Frank Nimphius

  Though with Oracle JDeveloper 11g the problem of the IDE not rendering JSF pages properly in the visual editor has become rare, there always is a way for the creative to break IDE functionality. A possible reason for the visual editor in JDeveloper to break is a failed dependency reference, which often is in a custom JSF PhaseListener configured in the faces-config.xml file. To avoid this from happening, surround the code in your PhaseListener class with the following statement (for example in the afterPhase method) public void afterPhase(PhaseEvent phaseEvent) {   if(!ADFContext.getCurrent().isDesigntime()){ ... listener code here ... } } The reason why the visual editor in Oracle JDeveloper fails rendering the WYSIWYG view has to do with how the live preview is created. To produce the visual display of a view, JDeveloper actually runs the ADF Faces view in JSF, which then also invokes defined PhaseListeners. With the code above, you check whether the PhaseListener code is executed at runtime or design time.If it is executed in design time, you ignore all calls to external resources that are not available at design time.

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• Dell Vostro Desktop error.

  - by goldenmean

  Faced a strange situation at work today. We have people sitting at a table on opposite sides, with power cables underneath the table. This morning when the person sitting opposite to me banged his feet on ground, it disturbed the power cable to my PC and it turned-off. So when I turned it on, it says, "No boot device found" Press F1 to setup or F5 to perform test... There was no physical impact/crash/fall of the desktop cabinet, which could have crashed/damaged the hard disk physically. EDIT: The OS is Windows 7 So I tried to recognize it in the Bios setup, but even there it could not find the SATA disk that is connected to this machine. So then I opened the cabinet, removed the power supply and plugged it back again. Tried to reboot, same error, "Boot device not found" It is not recognizing the hard disk. Any ideas about what might be wrong? Hard-disk crash, OS Crash(But it doesn't even go to the point of loading the disk after the initial Bios execution, so doubt this...) Any pointers about how I should proceed to troubleshoot/solve this error are welcome.

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• Allowing access to company files accross the internet

  - by Renaud Bompuis

  The premise I've been tasked with finding a solution to the following scenario: our main file server is a Linux machine. on the LAN, users simply access the files using SMB. each user has an account on the file server and his/her own access rights. user accounts are simple passwd/group security accounts, not NIS/LDAP. The problem We want to give users (or at least some of them, say if they belong to a particular group) the ability to access the files from the Internet while travelling. Ideally I'd like a seamless solution. Maybe something that allows the user to access a mapped drive would be ideal. A web-oriented solution is also good but it should present files in a way that is familiar to users, in an explorer-like fashion for instance. Security is a must of course, and users would be expected to log-in. The connection to the server should also be encrypted. Anyone has some pointers to neat solutions? Any experiences? Edit The client machines are Windows only.

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• Nginx terminate SSL for wordpress

  - by Mike

  I have a bit of a problem. We run a wordpress blog behind a ngnix proxy and looking to terminate the ssl on the nginx side. Our current nginx config is upstream admin_nossl { server 192.168.100.36:80; } server { listen 192.168.71.178:443; server_name host.domain.com; ssl on; ssl_certificate /etc/nginx/wild.domain.com.crt; ssl_certificate_key /etc/nginx/wild.domain.com.key; ssl_session_timeout 5m; ssl_protocols SSLv2 SSLv3 TLSv1; ssl_prefer_server_ciphers on; ssl_session_cache shared:SSL:10m; ssl_ciphers RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP; location / { proxy_read_timeout 2000; proxy_next_upstream error; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_redirect off; proxy_max_temp_file_size 0; proxy_pass http://admin_nossl; break; It just does not seem to work. If I can hit https://host.domain.com but it quickly switches back to non-secured from what I can see. Any pointers?

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• rotating menu with Actors in libgdx

  - by joecks

  I am intending to build a circular menu, with menu items equally distributed around the circle. When clicking on a menu item the circle should rotate so that the selected item is facing the top. I am using libgdx and I am not very familiar with the Actors concept, so I intuitivly tried to implement an Actor, who is drawing a texture and then transforming it by using Actions, with no success: class CircleActor extends Actor { @Override public void draw(SpriteBatch batch, float parentAlpha) { batch.draw(texture1, 100, 100); } @Override public Actor hit(float x, float y) { return this; } } and the rotate action: CircleActor circleActor = new CircleActor(); circleActor.action(Forever.$(RotateBy.$(0.1f, 0.1f))); // stage.addActor(); stage.addActor(circleActor); The texture is rectangular, but it doe not work. 1. What is wrong? 2. Is it a good approach to solve the task? Thanks!

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• How can I install git on RHEL 6?

  - by JR.Xyza

  I'm trying to install Git on a RHEL6 development server, I have experience with Ubuntu but this is my first time working with RHEL (I'm a developer trying to fill in for a recently departed Linux Sysadmin). I've set up two additional repos (EPEL and IUS) for other packages needed for a Magento install. Output of yum repolist: [root@box]# yum repolist Loaded plugins: product-id, security, subscription-manager Updating certificate-based repositories. repo id repo name status epel Extra Packages for Enterprise Linux 6 - x86_64 7,841 ius IUS for RHEL 6Server - x86_64 135 Most of what I've read indicates a simple 'yum install git' should work with EPEL enabled, but I get the dreaded [root@box]# yum install git Loaded plugins: product-id, security, subscription-manager Updating certificate-based repositories. Setting up Install Process No package git available. Error: Nothing to do Same goes for git-daemon, etc. I've tracked down a number of git RPMs such as this one at repoforge but they require a train of dependencies that seems to never end. I've also toyed with compiling it manually but the rabbit hole to get make working seems to go even deeper. I'm convinced there's a simple oversight somewhere keeping me from being able to install from the EPEL repo, but I'm a rookie at all this. Thanks in advance for help/pointers/additional resources.

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• Bouncing ball isssue

  - by user

  I am currently working on the 2D Bouncing ball physics that bounces the ball up and down. The physics behaviour works fine but at the end the velocity keep +3 then 0 non-stop even the ball has stopped bouncing. How should I modify the code to fix this issue? ballPos = D3DXVECTOR2( 50, 100 ); velocity = 0; accelaration = 3.0f; isBallUp = false; void GameClass::Update() { velocity += accelaration; ballPos.y += velocity; if ( ballPos.y >= 590 ) isBallUp = true; else isBallUp = false; if ( isBallUp ) { ballPos.y = 590; velocity *= -1; } // Graphics Rendering m_Graphics.BeginFrame(); ComposeFrame(); m_Graphics.EndFrame(); }

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• Can the following Domain Entity contain logic for creating/deleting other entities?

  - by user702769

  a) As far as I understand it, in most cases Domain Model DM doesn't contain code for creating/deleting domain entities, but instead it is the job of layers ( ie service layer or UI layer ) on top of DM to create/delete domain entities? b) Domain entities are modelled after real world entities. Assuming particular real world entity being abstracted does have the functionality of creating/deleting other real world entities, then I assume the domain entity abstracting this real world entity could also contain logic for creating/deleting other entities? class RobotDestroyerCreator { ... void heavyThinking() { ... if(...) unitOfWork.registerDelete(robot); ... if(...) { var robotNew = new Robot(...); unitOfWork.registerNew(robotNew); { ... } } Thank you

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• How to export a C++ class library to C# using a dll?

  - by SICGames2013

  In my previous revision game engine I deported major functions for the game editor for C#. Now, I'm beginning to revise the game engine with a static library. There's a already dynamic library created in C++ to use DLLEXPORT for C#. Just now I want to test out the newer functions and created a DLL file from C++. Because the DLL contains classes I was wondering how would I be able to use DLL Export. Would I do this: [DLLEXPORT("GameEngine.dll", EntryPoint="SomeClass", Conventional=_stdcall)] static extern void functionFromClass(); I have a feeling it's probably DLLImport and not DLLExport. I was wondering how would I go about this? Another way I was thinking was because I already have the DLL in C++ prepared already to go the C# Class Library. I could just keep the new engine as a lib, and link the lib with the old DLL C++ file. Wouldn't the EntryPoint be able to point to the class the function is in?

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• Moving the jBullet collision body to with the player object

  - by Kenneth Bray

  I am trying to update the location of the rigid body for a player class, as my player moves around I would like the collision body to also move with the player object (currently represented as a cube). Below is my current update method for when I want to update the xyz coords, but I am pretty sure I am not able to update the origin coords? : public void Update(float pX, float pY, float pZ) { posX = pX; posY = pY; posZ = pZ; //update the playerCube transform for the rigid body cubeTransform.origin.x = posX; cubeTransform.origin.y = posY; cubeTransform.origin.z = posZ; cubeRigidBody.getMotionState().setWorldTransform(cubeTransform); processTransformMatrix(cubeTransform); } I do not have rotation updated, as I do not actually want/need the player body to rotate at all currently. However, in the final game this will me put in place.

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• Texture not rendering in correct order in xna 4?

  - by user1090751

  I am making a simple board game. In the game there is a fixed background called myTexture and others are textureGoat and textureTiger whicha are to be placed on top of the background(myTexture). But i am having problem that fourth and fifth component is not displaying however, the sixth component( i.e. myTexture) is appearing. Here is my code, please look at it protected override void Draw(GameTime gameTime) { GraphicsDevice.Clear(Color.Green); // TODO: Add your drawing code here spriteBatch.Begin(SpriteSortMode.BackToFront, BlendState.AlphaBlend); //placing tiger spriteBatch.Draw(textureTiger, new Rectangle(22, 25, 50, 50), Color.White);//first component spriteBatch.Draw(textureTiger, new Rectangle(22, 407, 50, 50), Color.White);//second component spriteBatch.Draw(textureTiger, new Rectangle(422, 25, 50, 50), Color.White);//third component spriteBatch.Draw(textureTiger, new Rectangle(422, 407, 50, 50), Color.White);//fourth component //placing goat spriteBatch.Draw(textureGoat, new Rectangle(125, 110, 50, 50), Color.White);//fifth component //placing background spriteBatch.Draw(myTexture, new Rectangle(0, 0, 500, 500), Color.White);//sixth component spriteBatch.End(); base.Draw(gameTime); }

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• Is there a way to avoid type-checking in this scenario?

  - by Prog

  I have a class SuperClass with two subclasses SubClassA and SubClassB. I have a method in a different class which takes a SuperClass parameter. The method should do different things depending on the type of the object it receives. To illustrate: public void doStuff(SuperClass object){ // if the object is of type SubClassA, do something. // if it's of type SubClassB, do something else. } I want to avoid type-checking (i.e. instanceof) because it doesn't feel like proper OO design. But I can't figure out how to employ Polymorphism to elegantly solve this problem. How can I solve this problem elegantly?

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• Texture not drawing on cubes

  - by Christian Frantz

  I can draw the cubes fine but they are just solid black besides the occasional lighting that goes on. The basic effect is being set for each cube also. public void Draw(BasicEffect effect) { foreach (EffectPass pass in effect.CurrentTechnique.Passes) { pass.Apply(); device.SetVertexBuffer(vertexBuffer); device.Indices = indexBuffer; device.DrawIndexedPrimitives(PrimitiveType.TriangleList, 0, 0, 8, 0, 12); } } The cubes draw method. TextureEnabled is set to true in my main draw method. My texture is also loading fine. public Cube(GraphicsDevice graphicsDevice, Vector3 Position, Texture2D Texture) { device = graphicsDevice; texture = Texture; cubePosition = Position; effect = new BasicEffect(device); } The constructor seems fine too. Could this be caused by the Vector2's of my VertexPositionNormalTexture? Even if they were out of order something should still be drawn other than a black cube

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• Microsoft Sync. Framework with Azure on iOS

  - by Richard Jones

  A bit of a revelation this evening. I discovered something obvious, but missing from my understanding of the brilliant iOS example that ships with the Sync. Framework 4.0CTP It seems that on the server side if a record is edited, correctly only the fields that are modified gets sent down to your device (in my case an iPad). I was previously just blindly assuming that I'd get all fields down. I modified my Xcode population code (based on iOS sample) as follows: + (void)populateQCItems: (id)dict withMetadata:(id)metadata withContext:(NSManagedObjectContext*) context { QCItems *item = (QCItems *)[Utils populateOfflineEntity:dict withMetadata:metadata withContext:context]; if (item != nil) // modify new or existing live item { if ([dict valueForKey:@"Identifier"]) // new bit item.Identifier = [dict valueForKey:@"Identifier"]; if ([dict valueForKey:@"InspectionTypeID"]) // new bit item.InspectionTypeID = [dict valueForKey:@"InspectionTypeID"]; [item logEntity]; } } I hope this helps someone else; as I learnt this the hard way. Technorati Tags: Xcode, iOS, Azure, Sync Framework, Cloud

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• Key Windows Phone Development Concepts

  - by Tim Murphy

  As I am doing more development in and out of the enterprise arena for Windows Phone I decide I would study for the 70-599 test.  I generally take certification tests as a way to force me to dig deeper into a technology.  Between the development and studying I decided it would be good to put a post together of key development features in Windows Phone 7 environment.  Contrary to popular belief the launch of Windows Phone 8 will not obsolete Windows Phone 7 development.  With the launch of 7.8 coming shortly and people who will remain on 7.X for the foreseeable future there are still consumers needing these apps so don’t throw out the baby with the bath water. PhoneApplicationService This is a class that every Windows Phone developer needs to become familiar with.  When it comes to application state this is your go to repository.  It also contains events that help with management of your application’s lifecycle.  You can access it like the following code sample. 1: PhoneApplicationService.Current.State["ValidUser"] = userResult; DeviceNetworkInformation This class allows you to determine the connectivity of the device and be notified when something changes with that connectivity.  If you are making web service calls you will want to check here before firing off. I have found that this class doesn’t actually work very well for determining if you have internet access.  You are better of using the following code where IsConnectedToInternet is an App level property. private void Application_Launching(object sender, LaunchingEventArgs e){ // Validate user access if (Microsoft.Phone.Net.NetworkInformation.NetworkInterface.NetworkInterfaceType != Microsoft.Phone.Net.NetworkInformation.NetworkInterfaceType.None) { IsConnectedToInternet = true; } else { IsConnectedToInternet = false; } NetworkChange.NetworkAddressChanged += new NetworkAddressChangedEventHandler(NetworkChange_NetworkAddressChanged);}void NetworkChange_NetworkAddressChanged(object sender, EventArgs e){ IsConnectedToInternet = (Microsoft.Phone.Net.NetworkInformation.NetworkInterface.NetworkInterfaceType != Microsoft.Phone.Net.NetworkInformation.NetworkInterfaceType.None);} Push Notification Push notification allows your application to receive notifications in a way that reduces the application’s power needs. This MSDN article is a good place to get the basics of push notification, but you can see the essential concept in the diagram below.  There are three types of push notification: toast, Tile and raw.  The first two work regardless of the state of the application where as raw messages are discarded if your application is not running.   Live Tiles Live tiles are one of the main differentiators of the Windows Phone platform.  They allow users to find information at a glance from their start screen without navigating into individual apps.  Knowing how to implement them can be a great boost to the attractiveness of your application. The simplest step-by-step explanation for creating live tiles is here. Local Database While your application really only has Isolated Storage as a data store there are some ways of giving you database functionality to develop against.  There are a number of open source ORM style solutions.  Probably the best and most native way I have found is to use LINQ to SQL.  It does take a significant amount of setup, but the ease of use once it is configured is worth the cost.  Rather than repeat the full concepts here I will point you to a post that I wrote previously. Tasks (Bing, Email) Leveraging built in features of the Windows Phone platform is an easy way to add functionality that would be expensive to develop on your own.  The classes that you need to make yourself familiar with are BingMapsDirectionsTask and EmailComposeTask.  This will allow your application to supply directions and give the user an email path to relay information to friends and associates. Event model Because of the ability for users to switch quickly to switch to other apps or the home screen is just one reason why knowing the Windows Phone event model is important.  You need to be able to save data so that if a user gets a phone call they can come back to exactly where they were in your application.  This means that you will need to handle such events as Launching, Activated, Deactivated and Closing at an application level.  You will probably also want to get familiar with the OnNavigatedTo and OnNavigatedFrom events at the page level.  These will give you an opportunity to save data as a user navigates through your app. Summary This is just a small portion of the concepts that you will use while building Windows Phone apps, but these are some of the most critical.  With the launch of Windows Phone 8 this list will probably expand.  Take the time to investigate these topics further and try them out in your apps. del.icio.us Tags: Windows Phone 7,Windows Phone,WP7,Software Development,70-599

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• How to set static ip address on vmware for NAT guest vms from an ubuntu Host dhcp server?

  - by javadba

  I need to configure various linux flavor NAT'ed guest vm's to have static ip addresses provided by the Ubuntu host. The vmware documentation punts on this topic, deferring to "see the man pages for your linux distribution". But the generic pages for "my linux distro" do not know about the special stuff for vmware e.g. vmnet8. Pointers from someone who just knows how to do this would be much appreciated. Here is the /etc/vmware/vmnet8/dhcpd/dhcpd.conf: allow unknown-clients; default-lease-time 1800; # default is 30 minutes max-lease-time 7200; # default is 2 hours subnet 192.168.238.0 netmask 255.255.255.0 { range 192.168.238.128 192.168.238.254; option broadcast-address 192.168.238.255; option domain-name-servers 192.168.238.2; option domain-name localdomain; default-lease-time 1800; # default is 30 minutes max-lease-time 7200; # default is 2 hours option netbios-name-servers 192.168.238.2; option routers 192.168.238.2; } host vmnet8 { hardware ethernet 00:50:56:C0:00:08; fixed-address 192.168.238.1; option domain-name-servers 0.0.0.0; option domain-name ""; option routers 0.0.0.0; } Fromt the dhcpd.conf documentation, we are supposed to add an entry for static hosts similar to the following: host mystatichostonee { hardware ethernet 00:20:6B:C7:9B:E4; fixed-address 192.168.238.101; } host mystatichosttwo { hardware ethernet 00:23:7a:C7:9c:F2; fixed-address 192.168.238.102; } But notice that the vmnet8 entry in the vmware-generated dhcpd.conf already is set to fixed-address. I don't know how to add the specifics for my hosts to that vmnet8 entry: do they become nested?

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• Error on LDAP Login - xsessions error - Session lasted less than 10 seconds

  - by Draineh

  I have two machines both running CentOS 5.6 64bit. On the LDAP Machine it has a DHCP, BIND and OpenLDAP Server. LDAP is correctly configured and users can authenticate against it. Using root I configure machine 2 to use LDAP for authentication and when trying to log in it successfully authenticates against a saved user on the LDAP Server but produces the following errors and then throws me back to the login screen. I can still sign in as root and use the machine as normal. The syslog doesn't show any errors and I disabled SELinux to see if it was interfering. The error; Your session only lasted less than 10 seconds. If you have not lgoged out yourself, this could mean that there is some installation problem or that you may be out of diskspace. Try logging in with one of the failsafe sessions to see if you can fix this problem. There is then a tickbox to view the contents of ~/.xsessions-errors which contains; /etc/gdm/PreSession/Default: Registering your session with utmp /etc/gdm/PreSession/Default: running: /usr/bin/sessreg -a -u /var/run/utmp -x "/var/gdm:0:Xservers" -h "" -l ":0" "admin" localuser:admin being added to access control list No profile for user 'admin' found /bin/sh: /usr/bin/dbus-launch --exit-with-session /etc/X11/Xinit/Xclients: No such file or directory /bin/sh: line 0: exec: /usr/bin/dbus-launch --exit-with-session /etc/X11/xinit/Xclients: cannot execute: No such file or directory Apologies if someone notices something isn't spelt quite right or doesn't sound right, the system never actually creates or saves this file so I have had to type it across from the screen. Through the authentication panel in CentOS on the client I have set it to create the users home directory on login. The user is being correctly authenticated and the /home/admin folder has been created but this error would suggest it has not? The client is a new install on an 80gb hard drive so there is well over 80% of the drive still available. Thanks for any suggestions or pointers.

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• How to name a method that both performs a task and returns a boolean as a status?

  - by Limbo Exile

  If there is a method bool DoStuff() { try { // doing stuff... return true; } catch (Exception ex) { return false; } } should it rather be called IsStuffDone()? Both names could be misinterpreted by the user: If the name is DoStuff() why does it return a boolean? If the name is IsStuffDone() it is not clear whether the method performs a task or only checks its result. Is there a convention for this case? Or an alternative approach, as this one is considered flawed? For example in languages that have output parameters, like C#, a boolean status variable could be passed to the method as one and the method's return type would be void.

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• Circle physics and collision using vectors

  - by Joe Hearty

  This is a problem I've been having, When making a set number of filled circles at random locations on a JPanel and applying a gravity (a negative change in the y), each of the circles collide. I want them to have collision detection and push in the opposite direction using vectors but I don't know how to apply that to my scenario could someone help? public void drawballs(Graphics g){ g.setColor (Color.white); //displays circles for(int i = 0; i<xlocationofcircles.length-1; i++){ g.fillOval( (int) xlocationofcircles[i], (int) (ylocationofcircles[i]) ,16 ,16 ); ylocationofcircles[i]+=.2; //gravity if(ylocationofcircles[i] > 550) //stops gravity at bottom of screen ylocationofcircles[i]-=.2; //Check distance between circles(i think..) float distance =(xlocationofcircles[i+1]-xlocationofcircles[i]) + (ylocationofcircles[i+1]-xlocationofcircles[i]); if( Math.sqrt(distance) <16) ...

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