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• OpenGL 2.1+ Render with data returned form assimp library

  - by Bình Nguyên

  I have just readed this tutorial about load a 3D model file: http://www.lighthouse3d.com/cg-topics/code-samples/importing-3d-models-with-assimp/#comment-14551. Its render routine uses a recursive_render function to scan all node. My question: What is a aiNode struct store? What different form this method and above method: for (int i=0; imNumMesh; ++i) { draw scene-mMeshes[i]; } Thanks for reading!

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• Economical DNS hosting separate from local registrar for country specific TLDs - email or web hosting not required

  - by Eric Nguyen

  Our company owns many country specific top level domains (TLDs; .sg, .my). We will purchase more for other countries in all South East Asia. These domains are associated with our websites hosted on Amazon EC2. The DNS records are currently hosted on a dedicated server that will shut down tomorrow. (The name servers are set to the ones of a web hosting company) Therefore, I will need to host the DNS records somewhere else. Hosting the DNS records with the local registrar costs SGD18 a year per domain in addition to the domain price (which is already very expensive but we have no choice). It would be convenience to host DNS recors for all the country specific TLDs we have using a single service, separate from the local registrars from which we bought the domains. A few searches prompted examples like Amazon Route 53 and dnsmadeeasy.com and the likes. However, since I'm only concern about the country specific TLDs, not .com 1) Is it really economical to host DNS records of all domains in 1 single place as described above? (Have the relevant countries and/or the local registrars done something to keep their monopoly and always charges ridiculous prices for their country specific TLDs?) 2) I would imagine I will need to tell the local registrars to update the name servers to those of the DNS hosting service provider e.g. dnsmadeeasy.com here. Am I correct about how it works here? 3) Will I be able point the TLDs themselves to IP addresses I desire (the EC2 instances where my websites are) or will I only able to do so with the subdomains? 4) Are there any drawbacks that I should know here? Background about our needs: We need the websites associated with the country TLDs to be up and running all the times Also, we'll need to be able to add/edit A and CNAME records We use Google Apps for Business for internal email so I will need to be able to add/edit MX records and TXT records

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• 1 Google Analytics account or top-level domain + profiles for sub-domains vs. 1 account for each sub-domain

  - by Eric Nguyen

  We have the following websites An online magazine Singapore edition - sg.abc.com The same online magazine Malaysia edition - my.abc.com Forums around the same subjects as the online magazine but functions independently - forums.abc.com Classifieds site rather also around the same subjects but functions independently - directory.abc.com Each of the above websites currently has its own Google Analytics account. abc.com has a separate Google Analytics account too. sg.abc.com has the most traffic and generates most revenues Are there any practical benefits of merging all the above sub-domains to be under abc.com? I can think of more reliable analytics and consistency for sure. Are there more? cross-sales?

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• Okular can't read pdf files

  - by hoang anh Nguyen

  I recently have installed Okular on my Ubuntu 14.04. The problem is when I open pdf files, okular gives me the error "Can not find a plugin which is able to handle the document being passed." When I ran Okular by Terminal, this is the message I get. okular(14100)/kdeui (KIconLoader): Error: standard icon theme "oxygen" not found! okular(14100)/kdeui (KIconLoader): Error: standard icon theme "oxygen" not found! okular(14100) KPixmapSequence::Private::loadSequence: Invalid pixmap specified. okular(14100) KPixmapSequence::Private::loadSequence: Invalid pixmap specified. okular(14100) KPixmapSequence::frameSize: No frame loaded okular(14100) KPixmapSequence::Private::loadSequence: Invalid pixmap specified. okular(14100) KPixmapSequence::frameSize: No frame loaded okular(14100) KPixmapSequence::Private::loadSequence: Invalid pixmap specified. okular(14100) KPixmapSequence::frameSize: No frame loaded okular(14100) KPixmapSequence::Private::loadSequence: Invalid pixmap specified. okular(14100) KPixmapSequence::frameSize: No frame loaded okular(14100) KPixmapSequence::Private::loadSequence: Invalid pixmap specified. okular(14100) KPixmapSequence::frameSize: No frame loaded okular(14100) KPixmapSequence::Private::loadSequence: Invalid pixmap specified. okular(14100) KPixmapSequence::frameSize: No frame loaded okular(14100): No ksycoca4 database available! okular(14100)/kdecore (trader) KServiceTypeTrader::defaultOffers: KServiceTypeTrader: serviceType "okular/Generator" not found okular(14100)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig: okular(14100)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig: okular(14100)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig: okular(14100)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig: okular(14100)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig: okular(14100): No ksycoca4 database available! okular(14100)/kdecore (trader) mimeTypeSycocaServiceOffers: KMimeTypeTrader: mimeType "application/pdf" not found okular(14100): No ksycoca4 database available! okular(14100)/kdecore (trader): KMimeTypeTrader: couldn't find service type "okular/Generator" Please ensure that the .desktop file for it is installed; then run kbuildsycoca4. okular(14100)/okular (app) Okular::Document::openDocument: No plugin for mimetype '"application/pdf"'. okular(14100): Couldn't start knotify from knotify4.desktop: "KLauncher could not be reached via D-Bus. Error when calling start_service_by_desktop_path: The name org.kde.klauncher was not provided by any .service files " okular(14100)/kdeui (KNotification) KNotification::slotReceivedIdError: Error while contacting notify daemon "The name org.kde.knotify was not provided by any .service files" X Error: BadWindow (invalid Window parameter) 3 Major opcode: 20 (X_GetProperty) Resource id: 0x2a0002e okular(14110) KPixmapSequence::Private::loadSequence: Invalid pixmap specified. okular(14110) KPixmapSequence::frameSize: No frame loaded okular(14110) KPixmapSequence::Private::loadSequence: Invalid pixmap specified. okular(14110) KPixmapSequence::frameSize: No frame loaded okular(14110) KPixmapSequence::Private::loadSequence: Invalid pixmap specified. okular(14110) KPixmapSequence::frameSize: No frame loaded X Error: BadWindow (invalid Window parameter) 3 Major opcode: 20 (X_GetProperty) Resource id: 0x2a0001d X Error: BadWindow (invalid Window parameter) 3 Major opcode: 20 (X_GetProperty) Resource id: 0x2a0001d I would be much appreciated for any suggestion to solve this problem. Thanks a lot :)

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• Is there a more intelligent way to do this besides a long chain of if statements or switch?

  - by Harrison Nguyen

  I'm implementing an IRC bot that receives a message and I'm checking that message to determine which functions to call. Is there a more clever way of doing this? It seems like it'd quickly get out of hand after I got up to like 20 commands. Perhaps there's a better way to abstract this? public void onMessage(String channel, String sender, String login, String hostname, String message){ if (message.equalsIgnoreCase(".np")){ // TODO: Use Last.fm API to find the now playing } else if (message.toLowerCase().startsWith(".register")) { cmd.registerLastNick(channel, sender, message); } else if (message.toLowerCase().startsWith("give us a countdown")) { cmd.countdown(channel, message); } else if (message.toLowerCase().startsWith("remember am routine")) { cmd.updateAmRoutine(channel, message, sender); } }

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• URL masking with .htaccess

  - by Michael Nguyen

  I need a hardcore programmer to help me with URL masking. So this is my situation. My website www.michaelfotograf.dk/blog/ is the main site that needs to be configured. I have another website/webhotel called www.umagepar.dk www.umagepar.dk is redirected to www.michaelfotograf.dk/blog/ The blog is an ongoing project where i post a lot of stuff to get my ranking higher on google. www.umagepar.dk which redirect to www.michaelfotograf.dk/blog/ is also a project on is own, so I do not want people to know, that it is a blog connected with www.michaelfotograf.dk/blog/ I therefore need to mask www.michaelfotograf.dk/blog/ so it will be called www.umagepar.dk in the URL in the searchbar at all times! What I need is a programmer that can do this for me. Name your price, and I'll see if I can affort it. Michael

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• Problem with graphic Ubuntu 12.04 (not sure if it's because of the graphic driver)

  - by Duy Nguyen

  Ubuntu 12.04 was functioning properly . Then after an update, some graphic elements stop working properly. I could not launch programs that has 3D elements. Work space switcher's window displays 2D window instead of a 3D like usual. In Details menu, the Graphic row is blank. I am using Intel GMA 4500MHD graphic card. I am guessing that the driver is not properly installed? Anyone has the same issue? Please help!

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• Cocos2d-x v3.1 for WinPhone 8 auto change texture after resumed from background

  - by Bình Nguyên

  I have some sprites in my game (for Windows Phone 8). These are my steps to reproduce the problem: Open game Play (this is an optional step) Press Windows button to send game to background Press Back button to resume game The problem is: After the game has resumed, some sprites exchange textures, some sprites go black (like there is no texture being bound). I'm using cocos2dx version 3.1.1. Can someone help me to solve this problem?

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• Testing radius server from Mac OS X client

  - by Calvin Froedge

  I have a radius server set up on a server running Ubuntu 11.04. I have configured my switch to use the authentication server's IP (192.168.1.2) for RADIUS / 802.1x authentication, and I created a connection to test connecting from my Mac OSX client. Here is my radius configuration for the client: client 192.168.1.0/16 { secret = testing123 } I can successfully authenticate using both 127.0.0.1 (localhost) and 192.168.1.2 (ip of eth1), so I know radius is getting those requests. I set up a connection to test from my macbook, and my requests are timing out. http://screencast.com/t/tMhRLS3H7 Is there a better way to test the radius connection from my macbook? Thanks! UPDATE: I was able to successfully test on Mac OSX client using RadPerf. This is available as a cross-platform command line tool.

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• How to calibrate Wacom tablets under Ubuntu Lucid?

  - by Calvin Fisher

  I've been using Wacom tablets on Linux for quite some time, almost exclusively in Ubuntu, and in previous versions I've used xidump to track input values. I would use that information to put calibration settings in my xorg.conf file. However, in the most recent Ubuntu release, this command does not exist, and the package wacom-tools that previously installed it has now been removed. Is there a new method for calibrating Wacom pads under Linux? Should I have been using a different method all along for obtaining this information?

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• Hyper-V server 2012 nic teaming setup and virtual switch configuration

  - by Calvin

  I have a server with 2 nics. I installed Hyper-v 2012 server (not windows server 2012, no gui) I am trying to set up load balancing. I have both nics in the same switch currently in trunk mode and no native vlan. I use the new-netlbfoteam command to create a team with both nics, I can then "set-netlbfoteamnic "Nic Team" -vlanid 4" so that its available to me with a DHCP or static address but as soon as I try to create a virtual switch it becomes unresponsive. My guess is that is due to it removing the vlan tagging I setup. if I add-netlbfoteamnic and set it for vlan 4, then set the IP I can ping it from my management computer but I just get an error "an error occurred while attempting to connect to server "xxxxxx" Check that the Virtual Machine Management service is running and that you are authorized to connect to the server."

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• Requiring 802.1x login before allowing access to network resources

  - by Calvin Froedge

  I have a ZyXel GS2200-24 managed switch, and a free-radius server running on Ubuntu 11.10. Radius is configured and when I log into the switch the authentication goes through Radius. Now, I'm trying to ensure that access to web resources (as an example, I set up a web server on the ip 192.168.1.2) requires first authenticating with radius, before the switch will allow the connection. Am I correct that this should be handled at the switch level? What are these rules usually called / how are they usually defined?

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• What is the simplest way to build your own .deb package?

  - by Calvin Fisher

  Having used Ubuntu for several years now, I've assembled a short list of scripts and packages that I always install on my computers. I would like to pack them up into a .deb to make it easier to get set up on a fresh OS installation. I'm imagining, for instance, one package that would install all of my custom BASH scripts that I've made for common tasks, and another one that would depend on other packages (like w64codecs) that I always install but forget that I need to until I go to do something and it's not there. It doesn't even have to be by-the-book; I'm not looking to deploy these publicly. I'm just looking to roll up all these tasks into one sudo dpkg --install. To quantify "simple" or "easy," I mean to say that I'm looking for the method with the fewest steps requiring the least technical knowledge and, most importantly, taking the least time.

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• systemd initiated uwsgi process shuts down after a while

  - by Calvin Cheng

  So I wrote this simple systemd service script:- [Unit] Description=uwsgi server script [Service] User=web Group=web WorkingDirectory=/var/www/prod/myproject/releases/current ExecStart=/bin/bash -c 'source ~/.bash_profile; workon myproject; uwsgi --ini /var/www/prod/myproject/releases/current/myproject/uwsgi_prod.ini' [Install] WantedBy=multi-user.target which works fine - it starts up and I can see my uwsgi processes in htop. However, it inexplicably shuts down after being idle for 5 minutes. If I start this process manually in bash console by executing, as web user:- source ~/.bash_profile workon myproject uwsgi --ini /var/www/prod/myproject/releases/current/myproject/uwsgi_prod.ini my process does not die after being idle. What could the problem be?

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• Bring internet connection to ssh target machine via tunnel?

  - by Calvin

  I have a CentOS 5 machine deep inside firewalls that's only reachable via ssh on an unconventional port, let's say 98765. I normally connect to this machine like this: ssh -P 98765 user@ip -L5900:localhost:5900 I need to run yum to install some packages on this machine, but it's not possible since the outbound ports are all closed on this machine. I want to do something like this to "bring my internet connection" to this machine: ssh -P 98765 user@ip -L5900:localhost:5900 -R80:localhost:80 -R21:localhost:21 My intention is that, when I run yum on the machine, yum will use port 80 and 21 through my originating machine. Is something like this even possible?

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• Archiving old, outdated hard drives

  - by Calvin

  I have a number of old hard drives. I've decided to throw them out. But before I do that, I'd like to keep the contents of hard drives, intact. I tried to use the ISO file format to archive but the major problem is that it loses file attributes and can't create directories with exceeding depth of 8 levels. I do have drives over a variety of file systems; FAT, NTFS, ext2, ext3 and HFS and I'd like to archive them without any loss of information.

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• What kind of server do I need to handle 10 million requests and mySQL queries a day?

  - by Calvin

  I'm a new bie of server administration and I'm looking for a powerful hosting service to host my new website. This website is basically a back-end of an mobile online game, and it will: handle up to 10 million of HTTPS request and mySQL queries a day store up to 2000 GB file on the hard disk transfer probably 5000 GB data in and out per month it runs on PHP and mySQL have 10 million records in mySQL database, for each record there are 5-10 fields, around 100 bytes each I really don't know what kind of a server I need to handle these requirements, my question is: what cpu/ram do I need for a dedicated server or vps? what hosting companies are able to offer this kind of dedicated server or VPS? what about cloud computing? I've researched Amazon EC2 but it seems complicated to me. And I've contacted Rackspace but strangely they said Cloudsites is not suitable for my requirements. I wonder if there is other cloud hosting company. any other alternative method? thanks very much!

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• Windows 7 / Windows Vista won't connect to 802.1x RADIUS Server

  - by Calvin Froedge

  I've deployed Radius and have no problems connecting with TTLS, PEAP, or MD5 using linux, mac, and windows xp. For Windows 7 and Vista, I'm never prompted with the dialog box to enter username & password after configuring 802.1x support on the client. Steps taken: Enabled Wired Autoconfig in services.msc Set to use PEAP Set to require user authentication When I enable the network connection it says "Trying to authenticate" then fails with no error log / message given. The radius server gives no indication that there was ever a request (no Access-Reject - the client simply never tries to authenticate). On the windows 7 client, I can see that the DHCP server does not assign an IP to the client when 802.1x is enabled on the client (though it does when it isn't). How can I debug this further? Has anyone else run into a similar situation? My radius server is freeradius on Ubuntu 11.10.

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• Separate php.ini file for each Apache virtual host?

  - by Calvin L

  Is it possible to have a separate php.ini file that overrides the default php.ini file for each virtual host? I'm running Apache/2.2.14, PHP 5.3.2-1. For example I have several vhosts pointing to domains in my /var/www/ directory: /var/www/website1.com /var/www/website2.com What I'd like is to be able to place a custom php.ini file in each directory that would override the default values only for that vhost, but keep the original defaults if the value isn't specified: /var/www/website1.com/htdocs/ /var/www/website1.com/php.ini EDIT: I found more info on the topic here for those interested: http://serverfault.com/questions/34078/how-do-i-set-up-per-site-php-ini-files-on-a-lamp-server-using-namevirtualhosts

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• placing shell script under systemd control

  - by Calvin Cheng

  Assuming I have a shell script like this:- #!/bin/sh # cherrypy_server.sh PROCESSES=10 THREADS=1 # threads per process BASE_PORT=3035 # the first port used # you need to make the PIDFILE dir and insure it has the right permissions PIDFILE="/var/run/cherrypy/myproject.pid" WORKDIR=`dirname "$0"` cd "$WORKDIR" cp_start_proc() { N=$1 P=$(( $BASE_PORT + $N - 1 )) ./manage.py runcpserver daemonize=1 port=$P pidfile="$PIDFILE-$N" threads=$THREADS request_queue_size=0 verbose=0 } cp_start() { for N in `seq 1 $PROCESSES`; do cp_start_proc $N done } cp_stop_proc() { N=$1 #[ -f "$PIDFILE-$N" ] && kill `cat "$PIDFILE-$N"` [ -f "$PIDFILE-$N" ] && ./manage.py runcpserver pidfile="$PIDFILE-$N" stop rm -f "$PIDFILE-$N" } cp_stop() { for N in `seq 1 $PROCESSES`; do cp_stop_proc $N done } cp_restart_proc() { N=$1 cp_stop_proc $N #sleep 1 cp_start_proc $N } cp_restart() { for N in `seq 1 $PROCESSES`; do cp_restart_proc $N done } case "$1" in "start") cp_start ;; "stop") cp_stop ;; "restart") cp_restart ;; *) "$@" ;; esac From the bash script, we can essentially do 3 things: start the cherrypy server by calling ./cherrypy_server.sh start stop the cherrypy server by calling ./cherrypy_server.sh stop restart the cherrypy server by calling ./cherrypy_server.sh restart How would I place this shell script under systemd's control as a cherrypy.service file (with the obvious goal of having systemd start up the cherrypy server when a machine has been rebooted)? Reference systemd service file example here - https://wiki.archlinux.org/index.php/Systemd#Using_service_file

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• Sphinx 2.0.8 with Postgresql 9.2.4

  - by Calvin

  I want to install Sphinx 2.0.8 from source on CentOS 5.6 with PostgreSQL 9.2.4 my server type : Linux localhost.localdomain 2.6.18-348.6.1.el5 #1 SMP Tue May 21 15:29:55 EDT 2013 x86_64 x86_64 x86_64 GNU/Linux. First, i compile with : ./configure --prefix=/usr/local/sphinx --with-pgsql --without-mysql --with-pgsql-libs=/var/lib/pgsql/9.2/data/ --with-pgsql-includes=/usr/pgsql-9.2/include/ then it seems work, but after i run make errors appeared /usr/bin/ld: cannot find -lpq I have installed postgresql92-devel and libs also libpqxxx and worked with that error all day long but i am not solve that yet. Thanks for helping me.

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• systemd: enabling cherokee service as a `unit file`

  - by Calvin Cheng

  So I am learning how to use systemd to initialize my services automatically on server reboot. So of course, I first make sure I have systemd and some optional systemd related packages installed. pacman -S systemd initscripts-systemd Installation seems to go well and checking, I can see that systemd and its dependency libsystemd are installed. And the optional package initscripts-systemd is also installed:- [root@li280-195 ~]# pacman -Ss systemd extra/libsystemd 44-5 [installed] systemd client libraries extra/systemd 44-5 [installed] system and service manager extra/systemd-sysvcompat 2-2 sysvinit compat symlinks for systemd community/initscripts-systemd 20120412-1 [installed] Arch specific systemd initialization/bootup scripts for systemd community/systemd-arch-units 20120412-2 Arch specific Systemd unit files Next, I ensure that systemd is loaded up when my server reboots, via grub in grub's /boot/grub/menu.lst file like this:- kernel /boot/vmlinuz root=/dev/xvda ro init=/bin/systemd Rebooting my server to check, all loads up well and I can check that systemd is operational via:- systemctl list-unit-files However, I don't see my cherokee initialization script (which is simply created at /etc/rc.d/cherokee when I installed cherokee earlier via pacman -S cherokee) being listed as one of my unit files. So the question is, how do I do that? How do I put my cherokee initialization script under systemd's control?

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• Best practice for ONLY allowing MySQL access to a server?

  - by Calvin Froedge

  Here's the use case: I have a SaaS system that was built (dev environment) on a single box. I've moved everything to a cloud environment running Ubuntu 10.10. One server runs the application, the other runs the database. The basic idea is that the server that runs the database should only be accessible by the application and the administrator's machine, who both have correct RSA keys. My question: Would it be better practice to use a firewall to block access to ALL ports except MySQL, or skip firewall / iptables and just disable all other services / ports completely? Furthermore, should I run MySQL on a non-standard port? This database will hold quite sensitive information and I want to make sure I'm doing everything possible to properly safeguard it. Thanks in advance. I've been reading here for a while but this is the first question that I've asked. I'll try to answer some as well = )

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• Average memory used on a LAMP server

  - by Calvin L

  How much memory (RAM) would the average LAMP production server use, assuming little-to-no traffic, barebones except Apache2, PHP 5.3, MySQL5 installed and running?

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• Chroot for Mysql running on Ubuntu 10.10?

  - by Calvin Froedge

  Prompted from a question about MySQL server security best practices, I've been running through this list (with a few minor alterations) to properly secure my server database server: http://www.greensql.net/publications/mysql-security-best-practices On step 10, I'm told to change the root directory for the mysql user using chroot, but very few specifics are provided and I'm not sure where to start. Does anyone know of a good resource for walking me through the steps to properly create a chrooted environment for Ubuntu 10.10?

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