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• Why doesn't apache restart after configuring SSL?

  - by poz2k4444

  I've installed apache2 and then configured it to work with SSL following this and this tutorials, the problem becomes when I try to restart the service, I get the following error: (98)Address already in use: make_sock: could not bind to address 0.0.0.0:443 no listening sockets available, shutting down Unable to open logs the output of netstat -anp | grep 443 just display firefox listening and anything else, how could I solve this and get the service running??

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• Can't seem to run Apache 2.2 on Ubuntu 10.10 (Maverick Meerkat)

  - by Pam

  Here's my error message when I run sudo apachectl start: (98)Address already in use: make_sock: could not bind to address 127.0.0.1:80 no listening sockets available, shutting down Unable to open logs Action 'start' failed. The Apache error log may have more information. myUser@myMachine:/etc $ sudo apachectl stop httpd (no pid file) not running I'm brand new to Ubuntu (and Linux) and downloaded Apache 2.2 (worker) through Synaptic. I found a httpd.conf flavor I liked and am using it.

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• Error starting postgresql server on ubuntu

  - by xain

  Hi, I recently stopped the postgresql database (that was working perfectly), and after a couple of days, when I try to start it, I get the errors: 2011-01-03 23:56:27 CLST LOG: could not translate host name "localhost", service "5432" to address: Name or service not known 2011-01-03 23:56:27 CLST WARNING: could not create listen socket for "localhost" 2011-01-03 23:56:27 CLST FATAL: could not create any TCP/IP sockets I'm running Ubuntu 9.1, and I'm using the usuals /etc/init.d/postgresql-8.4 start and stop Any hints ?

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• Closing idle connections with iptables.

  - by kyku

  Hi, I have a server application that does not remove idle connections (resulting from for example client or communication failures). Is it possible to configure iptables to monitor activity on sockets and close connections haven't had any activity for a specified amount of time?

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• installed mongo using brew but stuck at prompt

  - by user50946

  I have installed mongo using brew on my mac. When I give mongo command I see this MongoDB shell version: 2.4.6 connecting to: test but it stays there and never give me command prompt back anyone else noticed something like this I have reinstalled with no luck. The issue is persistent thanks Logs ***** SERVER RESTARTED ***** Fri Oct 18 08:11:48.360 [initandlisten] MongoDB starting : pid=2081 port=27017 dbpath=/usr/local/var/mongodb 64-bit host=Asims-MacBook-Air.local Fri Oct 18 08:11:48.360 [initandlisten] db version v2.4.6 Fri Oct 18 08:11:48.360 [initandlisten] git version: nogitversion Fri Oct 18 08:11:48.360 [initandlisten] build info: Darwin minimountain.local 12.5.0 Darwin Kernel Version 12.5.0: Sun Sep 29 13:33:47 PDT 2013; root:xnu-2050.48.12~1/RELEASE_X86_64 x86_64 BOOST_LIB_VERSION=1_49 Fri Oct 18 08:11:48.360 [initandlisten] allocator: tcmalloc Fri Oct 18 08:11:48.360 [initandlisten] options: { bind_ip: "127.0.0.1", config: "/usr/local/etc/mongod.conf", dbpath: "/usr/local/var/mongodb", logappend: "true", logpath: "/usr/local/var/log/mongodb/mongo.log" } Fri Oct 18 08:11:48.361 [initandlisten] journal dir=/usr/local/var/mongodb/journal Fri Oct 18 08:11:48.361 [initandlisten] recover : no journal files present, no recovery needed Fri Oct 18 08:11:48.398 [websvr] admin web console waiting for connections on port 28017 Fri Oct 18 08:11:48.398 [initandlisten] waiting for connections on port 27017 Fri Oct 18 08:12:03.279 [signalProcessingThread] got signal 1 (Hangup: 1), will terminate after current cmd ends Fri Oct 18 08:12:03.279 [signalProcessingThread] now exiting Fri Oct 18 08:12:03.279 dbexit: Fri Oct 18 08:12:03.279 [signalProcessingThread] shutdown: going to close listening sockets... Fri Oct 18 08:12:03.279 [signalProcessingThread] closing listening socket: 9 Fri Oct 18 08:12:03.279 [signalProcessingThread] closing listening socket: 10 Fri Oct 18 08:12:03.280 [signalProcessingThread] closing listening socket: 11 Fri Oct 18 08:12:03.280 [signalProcessingThread] removing socket file: /tmp/mongodb-27017.sock Fri Oct 18 08:12:03.280 [signalProcessingThread] shutdown: going to flush diaglog... Fri Oct 18 08:12:03.280 [signalProcessingThread] shutdown: going to close sockets... Fri Oct 18 08:12:03.280 [signalProcessingThread] shutdown: waiting for fs preallocator... Fri Oct 18 08:12:03.280 [signalProcessingThread] shutdown: lock for final commit... Fri Oct 18 08:12:03.280 [signalProcessingThread] shutdown: final commit... Fri Oct 18 08:12:03.282 [signalProcessingThread] shutdown: closing all files... Fri Oct 18 08:12:03.282 [signalProcessingThread] closeAllFiles() finished

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• Simple Java networking game engine [on hold]

  - by Florian Peschka

  I want to create a simple java networking game and search a networking engine that eases use of sockets etc. I have already read some questions on here and the internet about java networking for games, but many of them were over 10 years old or not really answered. I have no idea whatsoever about what exactly I need to send in terms of messages, but I figured simple strings or integers will be enough for my purposes. It's basically a peer to peer game, so I don't need a centralized server structure. Messaging doesn't have to have an extremely low ping, yet of course all players need to have a synchronized view. What are the possibilities I have here?

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• Android -> Ruby Server Interface -> Mongodb

  - by MRabRabbit

  I've been wrecking my brain about this for a few days. I'll run my scenario by you and hopefully you can help me. In my head this is how it goes: I have an Android App. I want my Android App to make (function) calls to a MongoDB database via a Ruby Interface on the Server. e.g. Android app sends a HTTP GET ? with the function name, let's say getFriends for this user Ruby Interface receives this request from the app, grabs a thread from a thread pool and calls the appropriate function call implemented in Ruby, to the Mongodb. Ruby Interface gets results from Mongodb and sends a HTML POST to the Android app. So that's how I think it works. I know about the ruby driver for mongo db, and interacting with the mongodb from ruby but, how do I make a ruby back end listen for incoming messages and should these messages be done through sockets or a http interface ala Net::http in ruby?

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• How to build a turn-based multiplayer "real time" server

  - by jmosesman

  I want to build a TCG for mobile devices that is multiplayer over the web (not local wifi or bluetooth). As a player plays cards I want the second player to see what is being played in "real time" (within a few seconds). Only one player can play at a time. Server requirements: 1) Continuously listens for input from Player 1 2) As it receives input from Player 1, sends the message to Player 2 I know some PHP, but it seems like unless I had a loop that continued until I broke it (seems like a bad idea) the script would just receive one input and quit. On the mobile side I know I can open sockets using various frameworks, but what language allows a "stream-like" behavior that continuously listens/sends messages on the server? Or if I'm missing something, what would be the best practice here?

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• Online Multiplayer Game Architecture [on hold]

  - by Eric

  I am just starting to research online multiplayer game development and I have a high-level architectural question regarding how online multiple games function. I have server-side and client-side programming experience, and I understand how AJAX-esque transfer protocol operates. What I don't understand yet is how online multiple fits into all of that. For example, an online Tetris multiplayer game. Would both players have the entire Tetris game built out on their client-side and then get pushed "moves" from the other player via some AJAX-esque mechanism, in which case each client would have to be constantly listening via JavaScript for inbound "moves" and update the client appropriately? Or would each client build out the aesthetics and run a virtual server per game to which each client connects and thus pull and push commands in real-time via something like web sockets? I apologize if this question is too high-level and general, but I couldn't find anything online that offered this high-level of a perspective on the topic.

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• SPDIF Input not working

  - by BiggJJ

  One of my motherboard has two SPDIF sockets. One input and one output. Under windows these work fine and I am able to achieve what I'm trying here. I want to set Ubuntu up so it will play the Digital input out the Analogue output(normal headphone jack). Under my input devices there is no digital options, and under configuration there is no option for Digital Stereo input I only have options for Digital output and Analogue input, when really I want it the other way around. Can anyone shed any light? error when starting gnome-alsamixer:

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• How can I get data off of a (probably) very corrupt drive?

  - by Mercury1964

  So, my younger brother wanted my help today. Apparently, he was helping a friend install Ubuntu to his laptop, and midway through the install (on a filled hard-drive with Windows 8, from the liveusb thing): 1) They realized that they had chosen "Erase and install" accidentally and decided the best course of action was to (in the middle of an install, remember) 2) Force shutdown the computer. After I had replaced my eyeballs back into their sockets, my bro asked if I could do anything about his friend's data, which he wanted back. This, however, drifts out of my normal comfort zone. I know this about the install: 1) It was on a fairly new Windows 8 laptop, so it had whatever filesystem it uses nowadays on the entire drive 2) They didn't choose the "zero out drive data" option 3) They stopped the install at some point (not sure if before or after wipe) I can imagine that it now has two corrupted filesystems on it (whatever Windows 8 was on and ext3) and that some of the data still exists (assuming it wasn't overwritten already). Is there anything that can be done for whatever data is left on the drive?

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• How can a NodeJS server be used from Game Maker HTML5?

  - by Tokyo Dan

  I want to create a client-server game that runs on Game Maker HTML5-NodeJS. The NodeJS server will be an AI server - a bot that acts like a human opponent and plays against the human player at a front-end game client that is coded in GM HTML5. How can a NodeJS server be used from GM HTML5. Are there any examples of such a system? I already got an iOS game that can talk to a remote AI server (coded in Lua) using TCP sockets. Can this be done with Game Maker HTML5 and NodeJS.

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• Max Degree of Parallelism Server-Side Setting

  - by Tara Kizer

  Recently I opened a case with Microsoft PSS to help us through a severe performance problem on a new system.  As part of that case, the PSS engineer checked our “max degree of parallelism” server-side setting.  It is our standard to use 4 on our production systems that have 16 CPUs (2 sockets, quad-core, hyper-threaded).  The PSS engineer had me run the below query to get Microsoft’s recommended value of “max degree of parallelism” server-side setting for our 16-CPU system: select case when cpu_count / hyperthread_ratio > 8 then 8 else cpu_count / hyperthread_ratio end as optimal_maxdop_setting from sys.dm_os_sys_info; The query returned 2.  I made the change using sp_configure, and it did not resolve our issue.  We have decided to leave it in place for now.   Do you agree with this query?  What are your thoughts on this? If you decide to change your setting to reflect the output of this query, please test it first to ensure there are no negative side effects.

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• Dell whitepaper on PowerEdge R810 R910 and M910 Memory Architecture

  - by jchang

  The Dell PowerEdge 11 th Generation Servers: R810, R910 and M910 Memory Guidance whitepaper seems to have caused some confusion. I believe the source is an error in the paper. In the section on FlexMem Bridge Technology, the Dell whitepaper says this applies to the R810 and the M910. The Dell M910 is a 4-way blade server for the Xeon 7500 series processor line. First a breif recap. The R810 is a 2-way server, by which I mean it has two sockets regardless of the number of cores on each processor....(read more)

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• Push or Pull Input Data In the Game Logic?

  - by Qua

  In the process of preparing my game for networking I'm adding a layer of seperation between the physical input (mouse/keyboard) and the actual game "engine"/logic. All input that has any relation to the game logic is wrapped inside action objects such as BuildBuildingAction. I was thinking of having an action processing layer that would determine what to do with the input. This layer could then be set up to either just pass the actions locally to the game engine or send it via sockets to the network server depending on whether the game was single- or multiplayer. In network games it would make sense that the player's actions should be sent to the server, but should the game logic be pulling (polling?) the data through some sort of interface or should the action processing layer be adding the actions to an input queue in the game logic code?

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• What are the basics (best practices, etc) of writing a good Flash application?

  - by donut

  I've been tasked with writing a Flash application for facilitating a Fantasy Football draft pick. Normally, my choice would be to write this application in JavaScript. Unfortunately, it will require the use of sockets and since we don't have enough experience with Web Socket JS to be sure it would work in this situation I need to learn Flash. Currently, I'm most proficient in JavaScript/HTML/CSS/PHP/MySQL and have never really used Flash in a meaningful way. As best as I can I want to start this project off "the right way". So, what are good to know best practices and/or references/resources that will teach my the right way of doing things in Flash?

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• Best design for a memory resident tool

  - by Andrew S.

  I apologize if this tends more toward design that programming, but here goes. What design would you recommend for a database that is Memory resident Must run on windows, linux and (at a stretch) the mac Accept multiple queries simultaneously Have minimum overhead, since a search is expected to take <0.25s This program implements a domain-specific search. Think of it as a database, but one that takes advantage of domain specific information to outperform a convential database search (for example, with custom oracle indexing). We have a custom data structure for our data. Our protoype is a simple exe that constructs the database in memory each time it is run. We were thinking that perhaps this program would suffice, but augmented with sockets so it can listen for queries. This database will be static. Its contents will change infrequently. We expect queries, and the solution, to be delivered via a web service.

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• Online & Offline in Web Chat Application

  - by Mohammed Safeer

  I stuck amidst developing a chat web application using php for client side app. I used comet for chat application. And use technique of updating database when someone logout. Thus display offline on other side user. My problem is if someone close browser without logout, how the other side user know the person goes offline. How can i set online and offline icon in a php webchat application, when someone close chat window without logout? Is web sockets in php solve this problem? welcome all suggestions.

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• How to write a network game? [closed]

  - by Tom Wijsman

  Based on Why is so hard to develop a MMO?: Networked game development is not trivial; there are large obstacles to overcome in not only latency, but cheat prevention, state management and load balancing. If you're not experienced with writing a networked game, this is going to be a difficult learning exercise. I know the theory about sockets, servers, clients, protocols, connections and such things. Now I wonder how one can learn to write a network game: How to balance load problems? How to manage the game state? How to keep things synchronized? How to protect the communication and client from reverse engineering? How to work around latency problems? Which things should be computed local and which things on the server? ... Are there any good books, tutorials, sites, interesting articles or other questions regarding this? I'm looking for broad answers, but specific ones are fine too to learn the difference.

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• JavaOne 2012 LAD Session: The Future of JVM Performance Tuning

  - by Ricardo Ferreira

  Hi folks. This year, together with the Oracle Open World Latin America, happened another edition of the JavaOne Latin America, the more important event of Java for the developers community. I would like to share with you the slides that I've used in my session. The session was "The Future of JVM Performance Tuning" and the idea was to share some knowledge about JVM enhancements that Oracle implemented in Hotspot about performance, specially those ones related with GC ("Garbage Collection") and SDP ("Sockets Direct Protocol"). I hope you enjoy the content :)

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• Discussion of a Distributed Data Storage implementation

  - by fegol

  I want to implement a distributed data storage using a client/server architecture. Each data item will be stored persistently in disk in one of several remote servers. The client uses a library to update and query the data, shielding the client from its actual location. This should allow a client to associate keys (String) to values(byte[]), much as a Map does. The system must ensure that the amount of data stored in each server is approximately the same. The set of servers is known beforehand by other servers and clients. Both the client and the server will be written in Java, using sockets, threads, and files. I open this topic with the objective of discussing the best way to implement this idea, assuming simplicity, what are the issues of this implementation, performance measurements and discussion of the limitations.

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• Tips for communication between JS browser game and node.js server?

  - by Petteri Hietavirta

  I am tinkering around with some simple Canvas based cave flyer game and I would like to make it multiplayer eventually. The plan is to use Node.js on the server side. The data sent over would consists of position of each player, direction, velocity and such. The player movements are simple force physics, so I should be able to extrapolate movements before next update from server. Any tips or best practices on the communications side? I guess web sockets are the way to go. Should I send information in every pass of the game loop or with specified intervals? Also, I don't mind if it doesn't work with older browsers.

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• What services exist for finding someone specific to then run your own peer to peer software with?

  - by psr

  If you give people peer to peer software (such as a web sockets application if the peer to peer part gets implemented, but could be anything) the first step for some kinds of applications is to find a specific person and try to connect with them. If neither of you has a URI (and knows what it is) you need a third party to handle finding each other and verifying your identities. After that the third party isn't needed because you go peer to peer. I could of course write that third party software and put it up on a website, but then I would have to write that third party software and put it up on a website (or a server that isn't a website if that's how I want to do it). Does anyone offer this service? Ideally as a website and of course ideally free.

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• How to write a network game?

  - by TomWij

  Based on Why is so hard to develop a MMO?: Networked game development is not trivial; there are large obstacles to overcome in not only latency, but cheat prevention, state management and load balancing. If you're not experienced with writing a networked game, this is going to be a difficult learning exercise. I know the theory about sockets, servers, clients, protocols, connections and such things. Now I wonder how one can learn to write a network game: How to balance load problems? How to manage the game state? How to keep things synchronized? How to protect the communication and client from reverse engineering? How to work around latency problems? Which things should be computed local and which things on the server? ... Are there any good books, tutorials, sites, interesting articles or other questions regarding this? I'm looking for broad answers, but specific ones are fine too to learn the difference.

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• Sending files via HTTP to web service

  - by Serguei Fedorov

  I am bit frustrated at the lack of information about this online. Here is the issue: I am in charge of creating a iOS application which sends sound data back and forth between the server and the app. The Audio is in small files and thus does not need to be streamed over, but rather it can be sent. Right now, I am using a TCP server I wrote to handle applications like this. However, I want to keep the system as simple as possible and writing your own server and client sockets can get a bit complex and leaves room for crashes. Overall it slows down development because I need to account for packet structure and other things. My question is, can I write an ASPX or PHP web service that lets me pass the files back and forth through GET or POST?

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