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• Can ping localhost but can't browse

  - by Anna

  I know this is a pretty common question but I did my research and couldn't find a solution for this issue. I'm configuring a development application server and I came to the point where I can ping both localhost and 127.0.0.1, but I cannot browse either of them from IE or Firefox. I can browse and ping other websites (such as google) just fine. I tried flushing the dns (ipconfig /flushdns), restarting the IIS Admin service, restarting IIS itself, etc, and nothing seems to work. The results from ipconfig /all shows IP Rounting Enabled = No and WINS Proxy Enabled = No. Hwat is intriguing to me is that I compared everything in IIS in the dev environment with the production environment and the settings are the same, but I can browse localhost in production, but not in dev! What could be causing the inability to browse localhost and 127.0.0.1 from IE and Firefox?

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• Spreading incoming batched data into a real-time stream

  - by pr1001

  I would like to display some events in 'real-time'. However, I must fetch the data from another source. I can request the last X minutes, though the source is updated approximately every 5 minutes. This means that there will be a delay between the most recent data retrieved and the point in time that I make the request. Second, because I will be receiving a batch of data, I don't want to just fire out all the events down a socket once my fetcher has retrieved it: I would like to spread out the events so that they are both accurately spaced amongst each other and in sync with their original occurrences (e.g. an event is always displayed 6 minutes after it actually happened). My thought is to fetch the data every 5 minutes from the source, knowing that I won't get the very latest data. The original data would be then queued to be sent down the socket 7.5 minutes from its original timestamp – that is, at least ~2.5 minutes from when its batch was fetched and at most 7.5 minutes since then. My question is this: is this the best way to approach the problem? Does this problem have any standard approaches or associated literature related to implementation best-practices and edge cases? I am a bit worried that the frequency of my fetches and the frequency in which the source is updated will get out of sync, leading to points where no data will be retrieved from the source. However, since my socket delay is greater than my fetch frequency, the subsequent fetch should retrieve newer data before the socket queue is empty. Is that correct? Am I missing something? Thanks!

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• Android From Local DB (DAO) to Server sync (JSON) - Design issue

  - by Taiko

  I sync data between my local DB and a Server. I'm looking for the cleanest way to modelise all of this. I have a com.something.db package That contains a Data Helper and couple of DAO classes that represents objects stored in the db (I didn't write that part) com.something.db --public DataHelper --public Employee @DatabaseField e.g. "name" will be an actual column name in the DB -name @DatabaseField -salary etc... (all in all 50 fields) I have a com.something.sync package That contains all the implementation detail on how to send data to the server. It boils down to a ConnectionManager that is fed by different classes that implements a 'Request' interface com.something.sync --public interface ConnectionManager --package ConnectionManagerImpl --public interface Request --package LoginRequest --package GetEmployeesRequest My issue is, at some point in the sync process, I have to JSONise and de-JSONise my data (E.g. the Employee class). But I really don't feel like having the same Employee class be responsible for both his JSONisation and his actual representation inside the local database. It really doesn't feel right, because I carefully decoupled the rest, I am only stuck on this JSON thing. What should I do ? Should I write 3 Employee classes ? EmployeeDB @DatabaseField e.g. "name" will be an actual column name in the DB -name @DatabaseField -salary -etc... 50 fields EmployeeInterface -getName -getSalary -etc... 50 fields EmployeeJSON -JSON_KEY_NAME = "name" The JSON key happens to be the same as the table name, but it isn't requirement -name -JSON_KEY_SALARY = "salary" -salary -etc... 50 fields It feels like a lot of duplicates. Is there a common pattern I can use there ?

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• Where can I find details on installing and using Solr on Tomcat using the solr-common and solr-tomcat packages?

  - by danieltalsky

  I'm seeing lots of Solr/Tomcat installation instructions, but all of them install at least one of these packages from source. Since there's tomcat6, solr-common, and solr-tomcat packages (in Ubuntu 10.4), I'd love to use them, but I can't find any kind of documentation on installing using them. I can't even tell what directory solr is stored in. I get a "Welcome to Solr!" page at http://localhost:8080/solr/, but have no idea where the catalina home is, or where the solr configuration files are in this case. Can anyone point me to documentation?

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• netmask: command not found

  - by Ian R.

  I purchased a new server with a few ip's so I modified the /etc/network/interfaces file recently so that my ip's can go live. While editing that file I created a backup and deleted the original file. I recreated the interfaces file using the touch command and gave +x permissions but now, when trying to restart the interface (/etc/network/interfaces restart) I get all sorts of errors: /etc/network/interfaces: line 10: iface: command not found /etc/network/interfaces: line 11: address: command not found /etc/network/interfaces: line 12: netmask: command not found /etc/network/interfaces: line 13: auto: command not found Can any1 point what I forgot to do? Thanks.

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• debian hang on startup "starting the winbind daemon: winbind"

  - by Bajingan Keparat

  I took a copy of a VM running a debian, just so that I can play around with it. I spin up the copy, but didn't give it any network connection to avoid conflict with the original one. However, when I turn the VM on, it seems to freeze after this startup message Starting Sambe daemons:nmbd smbd Starting PostgreSQL 8.4 database server: main Starting the Winbind daemon: winbind how do i fix this? I never get to the prompt to login. This vm does have a mount point that connects to a windows share folder.

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• Is LSB's init script function "start_daemon" really used for real daemons or should I stick to start-stop-daemon?

  - by Fred

  In the context of init scripts, according to the LSB specification, "Each conforming init script shall execute the commands in the file /lib/lsb/init-function", which then defines a couple of functions to be used when using daemons. One of those functions is start_daemon, which obviously "runs the specified program as a daemon" while checking if the daemon is already running. I'm in the process of daemonizing a service app of mine, and I'm looking at how other daemons are run to try to "fit in". In the process of looking how it's done elsewhere, I noticed that not a single daemon on my Ubuntu 10.04 machine uses start_daemon. They all call start-stop-daemon directly. Same goes for my Fedora 14 machine. Should I try to play nice and be the first one to use start_daemon, or is there really no point and start-stop-daemon is the way to go since everybody is already using that? Why is there no daemons using LSB's functions?

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• Should you always pass the bare minimum data needed into a function

  - by Anders Holmström

  Let's say I have a function IsAdmin that checks whether a user is an admin. Let's also say that the admin checking is done by matching user id, name and password against some sort of rule (not important). In my head there are then two possible function signatures for this: public bool IsAdmin(User user); public bool IsAdmin(int id, string name, string password); I most often go for the second type of signature, thinking that: The function signature gives the reader a lot more info The logic contained inside the function doesn't have to know about the User class It usually results in slightly less code inside the function However I sometimes question this approach, and also realize that at some point it would become unwieldy. If for example a function would map between ten different object fields into a resulting bool I would obviously send in the entire object. But apart from a stark example like that I can't see a reason to pass in the actual object. I would appreciate any arguments for either style, as well as any general observations you might offer. I program in both object oriented and functional styles, so the question should be seen as regarding any and all idioms.

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• Avoid overwriting all the methods in the child class

  - by Heckel

  The context I am making a game in C++ using SFML. I have a class that controls what is displayed on the screen (manager on the image below). It has a list of all the things to draw like images, text, etc. To be able to store them in one list I created a Drawable class from which all the other drawable class inherit. The image below represents how I would organize each class. Drawable has a virtual method Draw that will be called by the manager. Image and Text overwrite this method. My problem is that I would like Image::draw method to work for Circle, Polygon, etc. since sf::CircleShape and sf::ConvexShape inherit from sf::Shape. I thought of two ways to do that. My first idea would be for Image to have a pointer on sf::Shape, and the subclasses would make it point onto their sf::CircleShape or sf::ConvexShape classes (Like on the image below). In the Polygon constructor I would write something like ptr_shape = &polygon_shape; This doesn't look very elegant because I have two variables that are, in fact, just one. My second idea is to store the sf::CircleShape and sf::ConvexShape inside the ptr_shape like ptr_shape = new sf::ConvexShape(...); and to use a function that is only in ConvexShape I would cast it like so ((sf::ConvexShape*)ptr_shape)->convex_method(); But that doesn't look very elegant either. I am not even sure I am allowed to do that. My question I added details about the whole thing because I thought that maybe my whole architecture was wrong. I would like to know how I could design my program to be safe without overwriting all the Image methods. I apologize if this question has already been asked; I have no idea what to google.

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• Using a Vertex Buffer and DrawUserIndexedPrimitives?

  - by MattMcg

  Let's say I have a large but static world and only a single moving object on said world. To increase performance I wish to use a vertex and index buffer for the static part of the world. I set them up and they work fine however if I throw in another draw call to DrawUserIndexedPrimitives (to draw my one single moving object) after the call to DrawIndexedPrimitives, it will error out saying a valid vertex buffer must be set. I can only assume the DrawUserIndexedPrimitive call destroyed/replaced the vertex buffer I set. In order to get around this I must call device.SetVertexBuffer(vertexBuffer) every frame. Something tells me that isn't correct as that kind of defeats the point of a buffer? To shed some light, the large vertex buffer is the final merged mesh of many repeated cubes (think Minecraft) which I manually create to reduce the amount of vertices/indexes needed (for example two connected cubes become one cuboid, the connecting faces are cut out), and also the amount of matrix translations (as it would suck to do one per cube). The moving objects would be other items in the world which are dynamic and not fixed to the block grid, so things like the NPCs who move constantly. How do I go about handling the large static world but also allowing objects to freely move about?

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• How to get cluster information remotely via Powershell?

  - by pdanke

  I've been trying to find a good way to gather various pieces of a windows cluster setup remotely, preferably via WMI, as we are not yet at a point where Powershell remoting is implemented (and I know this problem goes away with that). I know I can use the following to get the current node: Get-WmiObject Win32_ComputerSystem -ComputerName RemoteServer1 | Select Name I also need the name property of Get-Cluster, which I can't figure out how to get from a remote system. Is there something out there, or should I wait it out until Remoting gets implemented? I'm a newbie to all things clustering, just a dba looking to inventory our servers properly. Thanks for any help!

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• PID:4 using Port 80

  - by CyberOPS

  I was trying to install Zend Server CE on my computer but when I got to the point were I need to choose the port for my Web Server it says: "Web Server Port: 80 Occupied". So I decided to check what is using Port 80 with CMD by typing: "netstat -o -n -a | findstr 0.0:80": TCP 0.0.0.0:80 0.0.0.0:0 LISTENING 4 I check for PID:4 in Task Manager's Processes and Services. Seems PID 4 is "System". So, what I want to know is how can I stop "System" (PID:4) from using Port 80? INFO: I am using: Windows 7 64bit; Zend Server CE 5.5.0

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• SMTP server to deliver mail to Rails app, how?

  - by Gunchars

  all, this is my first question and I hope I chose the right place to post it. Here's what I need help with: I've been looking for this all day and I'm having a hard time finding a SMTP mail server that would fit the following criteria: lightweight, does one thing and does it good is able to route and deliver local mail to a Rails application The second point could be accomplished in any number of ways. I'm running a VPS, so I have full freedom in how to implement this. It could, for example, put messages straight in the db, pipe them to a helper program that would then process them accordingly or also save messages in a mbox file and run a script after every received message. I'm building a small site so the traffic is not going to be a problem. If there are alternative ways to deliver messages to a Rails app, I'd gladly hear about them. Thank you. EDIT: After long searching, I think I've found what I was looking for. Exim is a mail server that can deliver local mail to pipes. Also, Rails 3 and ActionMailer can make it really easy to process the incoming mail. More info here: http://www.exim.org/exim-html-current/doc/html/spec_html/ch29.html http://guides.rubyonrails.org/action_mailer_basics.html#receiving-emails

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• nginx php-fpm trouble

  - by Patrick

  Hello, we're using php-fpm and have trouble getting the scripts to work if we change the 'root' value in nginx.conf. location ~ \.php$ { root /usr/share/nginx/html ; If we change that root to point to other directory, even if it's /usr/share/nginx/html/crap, it wouldn't work. The directory exists of course. It's like it can read the file in that directory, but not execute it. I've checked all file permissions. Anyone has any idea?

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• Global hotkeys: songbird on KDE

  - by alpha1

  I'm running songbird on opensuse 11.2 KDE 4.3.1 on my EEE pc. On windows, there is a hotkey thing inside Songbird, so i set META F9,10,11,12 as media keys and it work just fine. On linux, there is not hotkey thing in songbird, and I would like to set those same hotkeys. I've played around with the Amarok Hotkeys, which are now setup that way, and looked in all the KDE shortcuts, but cannot find a way to add a new program and new hot keys. I know its possible, I did it before once, but the KDE shortcut programs have changed and I no longer see the stuff i used to do it before. I'd like to do the same to banshee at some point, but Songbird is the important program. Any Ideas? Any way to set those keys to generic media buttons?

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• Experienced programmer, beginner at web design, tools for effective maintainable web design? [closed]

  - by Clinton

  I do quite a bit of programming in my work, which I'm comfortable with, but recently I've being trying to do some web-design for non-work related reasons. I've got a Drupal site up and running, and added some content. But they all look fairly basic. Header with some content. It doesn't look particularly polished. Anyway, as an example, what I wanted to do was make some "bubbles", each with some text in them. From a programmers point of view, say: bubble(question_text, answer_text) might expand to a box with some border, with "Question: " + question_text then "Answer: " + answer_text. Of course I'd have lots of these bubbles, but I'd like to change their look and feel in one place, so simple HTML would be a maintainable nightmare. I also want to lay them out on the screen in some fashion. I was thinking a mixture of javascript and CSS, or possibly use PHP which Drupal uses. On the other hand, I fear I might be taking a 1990s approach to this, and that there's actually tools available now that make this process a lot easier. I'm just wondering what the best approach to this sort of task is? Should I be using offline web design software and copying the code to Drupal, and if so, any recommendations? I'm sorry if my question is a bit vague, because I'm not really sure what question I should be asking. I'd appreciate if you answer and comment, and I'll try my best to be more specific as I understand more.

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• Thoughts (on Windows Phone 7) from the MVP Summit

  - by Chris Williams

  Last week I packed off to Redmond, WA for my annual pilgrimage to Microsoft's MVP Summit. I'll spare you all the silly taunting about knowing stuff I can't talk about, etc... and just get to the point. I'm a XNA/DirectX MVP, an ASP Insider and a Languages (VB) Insider... so I actually had access to a pretty broad spectrum of information over the last week. Most of my time was focused on Windows Phone 7 related sessions, and while I can't dig deep into specifics, I can say that Microsoft is definitely not out of the fight for Mobile. The things I saw tell me that Microsoft is listening and paying attention to feedback, looking at what works & what doesn't and they are working their collective asses off to close the gap between Google and Apple. Anyone who has been in this industry for a while can tell you Microsoft does their best work when they are the underdog. They are currently behind, and have a lot of work ahead of them, but this is when they bring all their resources together to solve a problem. After the week I spent in Redmond, and the feedback I heard from other MVPs, and the technological previews I saw... I feel confident in betting heavily on Microsoft to pull this off.

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• Domino 8.5.3: Attaching an Object Residing on Server (Lotusscript preferred)

  - by Void

  Not sure if this question is more appropriate for ServerFault or StackOverflow, sorry if it should belong elsewhere! I am working on an application and one of the function is to automatically send an email with an attachment. I can code the application to attach the object when it resides on local or on a mapped drive. Newbie Question: Is there a way to have the object reside on the Domino server, and still be able to point to it and have the application automatically attach and send? Is there any method that allows me to do this? Users have no direct access to the server/filesystem, so mapped drive of the Domino server is out of the question. Hope someone can shed some light on this question. Thanks!

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• Is there a method to export the URLs of the open tabs of a Firefox window?

  - by hekevintran

  If I have a Firefox window open that contains 10 tabs, is there a way in Firefox or by a plug-in to get the URLs of those 10 tabs as a text file or some other format? Right now if I want to do this I need to copy the URL of tab A, paste it somewhere, move to tab B, and repeat. I could also bookmark all the tabs into a folder and export that, but that seems like such a hassle. If there is no such method, could someone point me to some documents that describe the basics of writing a Firefox plug-in. I am willing to write this myself if there is no "standard" way.

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• Security of a free public VPN service

  - by Mark Belli

  I just started using VPNBOOK, which is a (very efficent) free VPN solution. I have a question: VPNBOOK user and pass used to connect to their vpn network are publicily available on their homepage; everybody uses them to connect to the vpn. Can a user intercept my wifi traffic and: Understand that my connections are directed to VPNBOOK servers. If point 1 is successful, then they could use VPNBOOK public user and pass to decrypt my traffic? I hope I am missing something, otherwise it would be a very big weakness and I would revert to a paid service (with a private account)

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• Oracle Loader for Hadoop 1.1.0.0.3

  - by mannamal

  We are pleased to announce availability of Oracle Loader for Hadoop 1.1.0.0.3, containing bug fixes and performance improvements to Oracle Loader for Hadoop. The updated product can be downloaded from here: http://www.oracle.com/technetwork/bdc/big-data-connectors/downloads/big-data-downloads-1451048.html Note that the Oracle Loader for Hadoop 1.1.0.0.3 kit is a complete kit containing the product and bug fixes. Fixes of the earlier version 1.1 patch releases are also included. Upgrading to Oracle Loader for Hadoop 1.1.0.0.3 (from versions 1.1.x): On the Oracle Big Data Appliance:  1. 1.  Upload the new oraloader rpm to the first Oracle Big Data Appliance server.  For example:   /tmp/oraloader-1.1.0.0.3-1.x86_64.rpm 2.     As the root user, use dcli from the first Oracle Big Data Appliance server to copy the new rpm to all nodes. For example:   #dcli -f /tmp/oraloader-1.1.0.0.3-1.x86_64.rpm  -d /tmp/oraloader-replace.rpm 3. 3.  As the root user, use dcli from the first Oracle Big Data Appliance server to replace the old oraloader rpm with the new one.  For example:  #dcli "rpm -e oraloader ; rpm -Uvh /tmp/oraloader-replace.rpm" On other hardware: 1. 1.  Unzip oraloader-1.1.0.0.3.x86_64.zip at <location of install> 2. 2.  Update OLH_HOME to point to <location of install>/oraloader-1.1.0.0.3 

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• Looking for a router-like web interface for my Debian gateway.

  - by marcusw

  Hey, I need a web interface program for my debian gateway which has the features of a router's one. Specifically, I must be able to easily Forward ports to various clients on the LAN or the router itself (it's also a server) Manage a DHCP server preferably including DHCP reservation for certain MACs Give me a list of the connected DHCP clients (optionally) Show which clients are the most active as far as bandwidth (something like iftop) Alternatively, it could be a graphical app which I could tunnel over ssh. No command line programs please...I'm used to doing this stuff with a point-and-click interface. Not adverse to command-line setup; just need to be able to reconfigure things graphically. Have a working LAMP setup. I've tried webmin, but it didn't satisfy the "easy" part...too many clicks and too many meny options.

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• Apache will not start after IP change

  - by Doron

  I'm running CentOS 5.8 and I had to change my server's IP address. Afterwards, I'm unable start Apache. I am also running virtualmin. The error I'm receiving is: Failed to start service Starting httpd: httpd: Could not reliably determine the server's fully qualified domain name, using 184.106.146.125 for ServerName (99) Cannot assign requested address: make_sock: could not bind to address 50.56.33.100:8080 no listening sockets available, shutting down Unable to open logs I edited my httpd.conf to point to the new IP address like such: #Listen 12.34.56.78:80 Listen 184.106.146.125:80 And looking at the error it still seems to be referring to the old ip address (50.*).

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• When to use delaycompress option in logrotate?

  - by Anand Chitipothu

  The man page of logrotate says that: It can be used when some program cannot be told to close its logfile and thus might continue writing to the previous log file for some time. I'm confused by this. If a program cannot be told to close its logfile, it will continue to write forever, not for sometime. If the compression is postponed to next rotation cycle, the program continues to write to that file even after the next rotation cycle. How is postponing solving the problem? My understanding is that copytruncate should be used when a program cannot be told to close the logfile. I'm aware that some data written to the logfile gets lost when the copy is in progress. I was looking at the logrotate file for couchdb, and it had both copytruncate and delaycompress options. /usr/local/couchdb-1.0.1/var/log/couchdb/*.log { weekly rotate 10 copytruncate delaycompress compress notifempty missingok } It looks like there is no point using delaycompress when copytruncate is already there. What am I missing?

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• Debian is equal to Ubuntu

  - by rkmax

  The title of the question is confusing, and does not explain my point well. I've always used Ubuntu server from version 10.04 and never had problem, now I have 4 machines with ubuntu 12.04.1 LTS installed on them and I found that under any circumstances where there is a high burden throws me a problem and machine crashes constantly. the most common is CPU#X stuck for Ns! Now I wonder if the administration of Debian is equal to that of ubuntu, regarding Servicos, packages, folders structure for example I would like to know if the services are installed in the same manner using invoke-rc.d, which handles additional security, including for not giving blind caning. I've been looking for a comparison chart but have not found anything yet, something between Debian 6.0.6 and Ubuntu 12.04 also the most common "hiccups" when you install the system

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