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• Free-space driven log rotation on linux?

  - by kdt

  Someone just asked me 'how long should we keep logs for our application', and my answer was 'until the disk is full' as there's no reason to throw them away other than running out of space. However, standard logrotate wants us to specify a specific period + number of rotations. Is there something similar that would let us say "rotate daily, and keep as much history as you like until there is only 5% space free"? The platform is Redhat Linux.

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• Weird graphics behaviour while playing games

  - by Ayush Khemka

  When I play any high-end game like NFS Most Wanted or FIFA 12, I get these weird things on my graphics. While playing NFS, my car has various transparent diamonds all over its body, and while playing FIFA I get these weird black lines all over the field. My PC specs are :- AMD Athlon II X2 ASUS M4A785D-M PRO 500GB Seagate HDD 2GB DDR2 Transcend RAM 1033Mhz ATI Radeon HD4350 512MB graphics card Tell me if I need to provide anything else. Please help me. Thanks.

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• Weird Apache behaviour and with files again

  - by afifio

  Hi and thanks for stopping by. I have read Weird Apache problem with file, I have read Weird Apache problem with file ...and its not the problem Setup single XAMPP installation on Windows, single windows user, 2HD, 1 is a portable USB. All is fine, until I move the xampp to new portable HD Symptom Old php files - works fine, new one doesnt http://127.0.0.1/Ajax/index.php - yay http://127.0.0.1/test2/t.php - display the source code http://127.0.0.1/Ajax/test2/t.php - display the source code http://127.0.0.1/Ajax/t.php - display the source code Extra Info IIS+MS Web Development stuff, .NET4, Asp, etc is being installed and still hast reboot yet. .htaccess also seems doesnt work Apache2 conf file was modified to Averride All and still it doesnt care. One of the directory supposed to treat .htm as php yet got text, created another directory and edit a phpinfo, still another text, browse to phpmyadmin, viola, works fine Suspect Does Apache honour XP security and permission ? If so, this is a single user computer. Does Apache dont like my new hard disk/new place ? Why it doesnt execute the php in new directory but happily execute in old folder ? Thanks for the riddle answers

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• Weird behaviour/rendering of backspace in Terminal.app when SSHing into zsh using tmux/screen

  - by Nils Riedemann

  Hi there, I just stumbled upon a weird problem. When I SSH into my server (centos, zsh) and I type some stuff and hit backspace It looks like a space - but internally it really deleted the characters. ls -l a Note that the space between land a is actually when I hit backspace. When I now hit return ls -a gets executed. This is only in zsh, in bash it works fine. Hope anyone has an idea what this is all about and how to fix this. Update: Only happens when using tmux/screen

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• Htaccess strange behaviour with Nginx

  - by Termos

  I have a site running on Nginx (v1.0.14) serving as reverse proxy which proxies requests to Apache (v2.2.19). So Nginx runs on port 80, Apache is on 8080. Overall site works fine except that i cannot block access to certain directories with .htaccess file. For example i have 'my-protected-directory' on 'www.site.com' Inside it i have htaccess with following code: <Files *> order deny,allow deny from all allow from 1.2.3.4 <--- my ip address here </Files> When i try to access this page with my ip (1.2.3.4) i get 404 error which is not what i expect: http://www.site.com/my-protected-directory However everything works as expected when this page is served directly by Apache. I can see this page, everyone else can't. http://www.site.com:8080/my-protected-directory Update. Nginx config (7.1.3.7 is site ip.): user apache; worker_processes 4; error_log logs/error.log; pid logs/nginx.pid; events { worker_connections 1024; } http { include mime.types; default_type application/octet-stream; log_format main '$remote_addr - $remote_user [$time_local] "$request" ' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for"'; sendfile on; keepalive_timeout 65; gzip on; gzip_min_length 1024; gzip_http_version 1.1; gzip_proxied any; gzip_comp_level 5; gzip_types text/plain text/css application/x-javascript text/xml application/xml application/xml+rss text/javascript image/x-icon; server { listen 80; server_name www.site.com site.com 7.1.3.7; access_log logs/host.access.log main; # serve static files location ~* ^.+.(jpg|jpeg|gif|png|ico|css|zip|tgz|gz|rar|bz2|doc|xls|exe|pdf|ppt|txt|tar|mid|midi|wav|bmp|rtf|js)$ { root /var/www/vhosts/www.site.com/httpdocs; proxy_set_header Range ""; expires 30d; } # pass requests for dynamic content to Apache location / { proxy_redirect off; proxy_set_header X-Real-IP $remote_addr; proxy_set_header Host $http_host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Range ""; proxy_pass http://7.1.3.7:8080; } } Could please anyone tell me what is wrong and how this can be fixed ?

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• Odd Apple AirPort Express behaviour

  - by MatthewD

  I've been using a rather old AirPort Express for home Wi-Fi for a number of years. (It's old enough that it only supports WPA, not WPA2 -- perhaps this is an indication that I should upgrade!) In the last week I've been experiencing very slow internet over the Wi-Fi. Suspecting that someone outside my home was leeching from me (despite a reasonable password and MAC address filtering turned on) I decided to change some settings: I changed the SSID, turned off broadcast of the SSID and changed the password. After these changes, I managed to connect using the new password on my iPad. But on the other devices I tried (iPhone, PS3) I was not able to connect. In fact, I only succeeded in connecting when I entered my OLD password! Is this a known issue with ancient AirPort Express units? Is my unit cracked and unrecoverable?

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• Empty mails received from Plesk-driven server

  - by goreSplatter

  From my Plesk managed server I keep receiving emails addressed to the configured administrator (me). Nothing special there. These mails are sent from an empty sender with no body, no subject nor any other relevant headers. I have changed the server administrator's e-mail address to an alternate one which is then the recipient. The mails are sent at irregular intervals. With variations in the timestamp I get an email every 30 minutes. Then there's a break and two and a half hours later I get the same email. I already have turned of crond for more than a day to see if this is the source of the problem. On that server there is no "foreign" software running which would cause that behavior. I have no more guesses as to why this is happening. Any suggestions?

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• Tool to launch a script driven by modem activity

  - by Will M

  Can anyone suggest a software tool (preferably under Windows XP or later) that would launch an application or script in response to a phone call being received on a landline phone line connected to a data modem on the same PC? or, better, in response to a sequence of touch-tones being played over such a phone line. This would allow, for example, using the telephone to manipulate firewall settings so as to create another layer of security in connection with remote internet access to that computer. I seem to recall seeing tools to do this sort of thing in the days before broadband internet access, when there was more attention to various tips and tricks for the dial-up modem, but a few attempts at Google hasn't turned anything up.

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• rsync --link-dest behaviour when run as sudo

  - by fotNelton

  In order to create regular backups, I'm using rsync together with --link-dest so as to create hard-links for unchanged files. For example: rsync -ax \ --partial --delete --delete-excluded --inplace \ --exclude-from=/tmp/temp_excludes \ --link-dest=/Volumes/Backup/current \ /Users /Volumes/Backup/2012-06-25 This works very well as long as I start the process from my normal user account. Though as soon as I start the process using sudo it behaves erradically, meaning that rsync copies all the unchanged files instead of hard-linking them. Since sudo modifies the environment, I've already also tried sudo -E in conjunction with making sure that my sudoers file has the corresponding option set. Well, that didn't work either. So, the question is, how can I run rsync using sudo? Whereas the above example only shows a backup of the Users directory, I also need to backup some system files that I can only access as root.

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• Strange zsh autocomplete behaviour.

  - by Leda

  Every time I use tab autocompletion with zsh instead of completing the current string, it gives me a new string + options to complete. It's hard to explane, so here is an example. This is what would happen if I type 'ls Nue' and hit tab. [me@mbp:/Volumes/hdd/music]: ls Neu ls Neu Neuraxis/ Neurosis/ Neutral\ Milk\ Hotel/ If I delete the second `ls Nue', I am unable to delete the white space and the first. If I hit return, it is as if I have just entered a blank line. Does anyone know what is going on.

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• Strange Behaviour with Unicode Characters in Windows

  - by open_sourse

  Ok, I do not know if this is a programming question, but it certainly is a technical one so I am asking it here. I was working on some internationalization stuff in my PHP code, and in order to ensure that my generated HTML shows up Unicode correctly based on the encoding and stuff I decided to add some Chinese text to my PHP page, which then echoes it into the browser to complete my test case. So I went into google and typed "Chinese", copied the first Chinese text that the search returned (which was ??/??). I then copied it into Notepad++ which is my editor, and to my surprise showed up as boxes similar to [][]/[][]. So I thought the encoding in Notepad++ was messed up and I changed the encoding to UTF-8 and UCS, neither worked. I did it fresh in a newly encoded file, still I got the boxes. The same content when I paste into Google and StackOverFlow (like I did in this posting) shows up correct Chinese! I even opened up Windows Clipboard Viewer and the content is represented in the Clipboard as boxes! I tried pasting it into Windows Explorer address bar and using to rename a file to, but I still get boxes. But it shows up correctly when pasted into my Chrome Browser address bar! Is this a Windows issue? Since I am able to paste it correctly in SO, the data in memory should be encoded correctly right? But if that is the case why does it show up as boxes in the Clipboard Viewer? I am confused here...By the way I am using Windows XP with SP3. (I am asking this question here, even if it is not programmatic, because it is preventing me from running my programming test cases..)

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• Firefox open new tab behaviour

  - by digital

  Hi, When I open a new tab the curser focuses on the address bar is it possible to focus on the search bar by default?

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• Different behaviour when running exe from command prompt than in windows

  - by valoukh

  Forgive me if I'm not using the correct terminology here but I'll try to explain the issue I'm having as best I can! We use a program that allows you to view video footage from several cameras, and it works in such a way that when it is opened it then automatically loads several video files within its interface. These video files are stored in a subfolder, e.g. "videos\video1.asf", etc. I didn't create the program so I can't say what method it uses to open the files. The files are stored on a network server and are being accessed via a share/UNC path. When the file is run from windows explorer (by navigating to the network share and double-clicking the exe), it works perfectly. When the file is run via the (elevated) command prompt (e.g. by typing the \server\path\to\file.exe) it opens, but the corresponding video files do not load. I am trying to create a script that launches the program via the command prompt, so the first step is finding out why the two actions above have different consequences. Any advice on how running executables from the command prompt could produce a different result would be greatly appreciated. Thanks

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• Different behaviour of script locally and over ssh

  - by neorg

  I have a script on a server-A Script-A #!/bin/bash -l echo "script-A.sh" | change-environment.sh When I ssh onto server-A and execute it, it works fine. However, when I ssh user@server-A ./script-A.sh Script-A executes, but throws an undefined variable error in change-environment.sh. change-environment.sh runs in the c shell(I have no control over the script so the method I have used is about the only way I can use it), but everything else is in bash. Had found a similar question at I can run a script locally, but cannot do "ssh HOSTNAME /path/to/script.sh". However, there was no solution to the issue and it was a year old.

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• Skype behaviour in the Windows 7 Superbar

  - by Rogue

  The new version of Skype is always stuck on my Super-Bar(unless i exit the program), which is really annoying. There is not option to minimize it to the tray at least in Skype options. Has anyone had this problem and figured out how to minimize it to the tray?

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• Choosing Technology To Include In Software Design

  How many of us have been forced to select one technology over another when designing a new system? What factors do we and should we consider? How can we ensure the correct business decision is made? When faced with this type of decision it is important to gather as much information possible regarding each technology being considered as well as the project itself. Additionally, I tend to delay my decision about the technology until it is ultimately necessary to be made. The reason why I tend to delay such an important design decision is due to the fact that as the project progresses requirements and other factors can alter a decision for selecting the best technology for a project. Important factors to consider when making technology decisions: Time to Implement and Maintain Total Cost of Technology (including Implementation and maintenance) Adaptability of Technology Implementation Team’s Skill Sets Complexity of Technology (including Implementation and maintenance) orecasted Return On Investment (ROI) Forecasted Profit on Investment (POI) Of the factors to consider the ROI and POI weigh the heaviest because the take in to consideration the other factors when calculating the profitability and return on investments.For a real world example let us consider developing a web based lead management system for a new company. This system can either be hosted on Microsoft Windows based web server or on a Linux based web server. Important Factors for this Example Implementation Team’s Skill Sets Member 1  Skill Set: Classic ASP, ASP.Net, and MS SQL Server Experience: 10 years Member 2  Skill Set: PHP, MySQL, Photoshop and MS SQL Server Experience: 3 years Member 3  Skill Set: C++, VB6, ASP.Net, and MS SQL Server Experience: 12 years Total Cost of Technology (including Implementation and maintenance) Linux Initial Year: $5,000 (Random Value) Additional Years: $3,000 (Random Value) Windows Initial Year: $10,000 (Random Value) Additional Years: $3,000 (Random Value) Complexity of Technology Linux Large Learning Curve with user driven documentation Estimated learning cost: $30,000 Windows Minimal based on Teams skills with Microsoft based documentation Estimated learning cost: $5,000 ROI Linux Total Cost Initial Total Cost: $35,000 Additional Cost $3,000 per year Windows Total Cost Initial Total Cost: $15,000 Additional Cost $3,000 per year Based on the hypothetical numbers it would make more sense to select windows based web server because the initial investment of the technology is much lower initially compared to the Linux based web server.

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• Why does mobile first responsive design tend to not use max-width queries alongside the min-width queries?

  - by Sam

  First off, I understand the basic principles behind mobile first responsive web design, and totally agree with them. But one thing I don't understand: In my experience, not all styles for small screens can be used for the larger version of a website. For example, usually smaller versions tend to have larger clickable areas, hamburger navigation, etc. So I sometimes have to override these specific styles, aside from just progressively enhancing the base styles. So I was wondering: why is max-width rarely mentioned (or used) in the context of mobile-first responsive web design? Because it looks like it could be used to isolate styles for smaller screens that are not useful for larger screens, and would thus prevent unnecessary duplication of code. A quote which mentions min-width as typically mobile-first, but not max-width: Mobile first, from a coding perspective, means that your base style is typically a single-column, fully-fluid layout. You use @media (min-width: whatever) to add a grid-based layout on top of that. from: http://gomakethings.com/mobile-first-and-internet-explorer/ EDIT: So to be more specific: I was wondering if there is a reason to exclude max-width from a mobile-first responsive design (as it seems like it can be useful for writing your css as DRY as possible, as some styles for small screens will not be used for bigger screens).

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• Design Book–Fourth(last) Section (Physical Abstraction Optimization)

  - by drsql

  In this last section of the book, we will shift focus to the physical abstraction layer optimization. By this I mean the little bits and pieces of the design that is specifically there for performance and are actually part of the relational engine (read: the part of the SQL Server experience that ideally is hidden from you completely, but in 2010 reality it isn’t quite so yet.  This includes all of the data structures like database, files, etc; the optimizer; some coding, etc. In my mind, this...(read more)

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• Dealing with a fundamental design flaw when you're new to the project

  - by Matt Phillips

  I've just started working on an open source project with around 30 developers in it. I'm working on fixing some of the bugs as a way to get into the "loop" and become a regular committer to the project. The problem is I think I've uncovered a fundamental design flaw that's causing one of the bugs I'm working on. But I feel like if I blast this on the mailing list I'm going to come off as arrogant, and some of the discussions I've had about the issue are butting heads with some of the people. How should I go about this?

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• Challenges in multi-player Android Game Server with RESTful Nature

  - by Kush

  I'm working on an Android Game based on Contract Bridge, as a part of my college Summer Internship project. The game will be multi-player such that 4 Android devices can play it, so there's no BOT or CPU player to be developed. At the time of getting project, I realized that most of the students had already worked on the project but none of their works is reusable now (for variety of reasons like, undocumented code and design architecture, different platform implementation). I have experience working on several open source projects and hence I emphasis to work out on this project such that components I make become reusable as much as possible. Now, as the game is multi-player and entire game progress will be handled on server, I'm currently working on Server's design, since I wanted to make game server reusable such that any client platform can use it, I was previously confused in selecting Socket or REST for Game Server's design, but later finalized to work on REST APIs for the server. Now, since I have to keep all players in-sync while they make movements in game, on server I've planned to use Database which will keep all players' progress, specific for each table (in Bridge, 4 players play on single table, and server will handle many such game tables). I don't know if its an appropriate decision to use database as shared medium to track progress of each game table (let me know if there's an appropriate or better option). Obviously, when game is completed for the table, data for that table on server's database is discarded. Now the problem is that, access to REST service is an HTTP call, so as long as client doesn't make any request, server will remain idle, and consider a situation where A player has played a card on his device and the device requests to apply this change on the server. Now, I need to let rest of the three devices know that the player has played a card, and also update view on their device. AFAIK, REST cannot provide a sort-of Push-notification system, since the connection to the server is not persistent. One solution that I thought was to make each device constantly poll the server for any change (like every 56 ms) and when changes are found, reflect it on the device. But I feel this is not an elegant way, as every HTTP request is expensive. (and I choose REST to make game play experience robust since, a mobile device tends to get disconnected from Internet, and if there's Socket-like persistent connection then entire game progress is subject to lost. Also, portability on client-end is important) Also, imagining a situation where 10 game tables are in progress and 40 players are playing, a server must be capable to handle flooded HTTP requests from all the devices which make it every 56 ms. So I wonder if the situation is assumed as DoS attack. So, explaining the situation, am I going on the right track for the server design? I wanted to be sure before I proceed much further with the code.

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• choosing Database and Its Design for Rails

  - by Gaurav Shah

  I am having a difficulty in deciding the database & its structure. Let us say the problem is like this. For my product I have various customers( each is an educational institute) Each customer have their own sub-clients ( Institution have students) Each student record will have some basic information like "name" & "Number" . There are also additional information that a customer(institution) might want to ask sub-client(student) like "email" or "semester" I have come up with two solutions : 1. Mysql _insititution__ id-|- Description| __Student__ id-|-instituition_id-|-Name-|-Number| __student_additional_details__ student_id -|- field_name -|- Value Student_additional_details will have multiple records for each student depending upon number of questions asked from institution. 2.MongoDb _insititution___ id-|- Description| _Student__ id-|-instituition_id-|-Name-|-Number|-otherfield1 -|- otherfield2 with mongo the structure itself can be dynamic so student table seems really good in mongo . But the problem comes when I have to relate student with institution . So which one is a better design ? Or some other idea ?

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• PASS Conference 2011 Topic: Multitenant Design and Sharding with SQL Azure

  - by Herve Roggero

  I am really happy to announce that I have been accepted as a speaker at the 2011 PASS Conference in Seattle. The topic? It will be about SQL Azure scalability using shards, and the Data Federation feature of SQL Azure. I will also talk extensively about the community open-source sharding library Enzo SQL Shard (enzosqlshard.codeplex.com) and show how to make the most out of it. In general, the presentation will provide details about how to properly design an application for sharding, how to make it work for SQL Server, SQL Azure, and how to leverage the upcoming Data Federation technology that Microsoft is planning. The primary objective is to turn sharding an implementation concern, not a development concern. Using a library like Enzo SQL Shard will help you achieve this objective. If you come to PASS Summit this year, come see me and mention you saw this blog!

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• Human vs human android chess game design

  - by Plejo

  First of all I am total amateur in game development and sorry for my poor English. I want to make android human vs human chess game. So I am wondering how to design it? scenario 1: User connect to server, find opponent and send moves to server using socket, so match is running on a server side. I think this is not good idea because move should be validated on client side - or do I have to validate moves on client side? I do not think this is good solution because game is seperated. scenario 2: Using hole punching technique so server is needed only for connection between players, so game is running on android devices. which approach do you suggest? Or is there any better solution? Which server is best to use?

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• When should complexity be removed?

  - by ElGringoGrande

  Prematurely introducing complexity by implementing design patterns before they are needed is not good practice. But if you follow all (or even most of) the SOLID principles and use common design patterns you will introduce some complexity as features and requirements are added or changed to keep your design as maintainable and flexible as needed. However once that complexity is introduced and working like a champ when do you removed it? Example. I have an application written for a client. When originally created there where several ways to give raises to employees. I used the strategy pattern and factory to keep the whole process nice and clean. Over time certain raise methods where added or removed by the application owner. Time passes and new owner takes over. This new owner is hard nosed, keeps everything simple and only has one single way to give a raise. The complexity needed by the strategy pattern is no longer needed. If I where to code this from the requirements as they are now I would not introduce this extra complexity (but make sure I could introduce it with little or no work should the need arise). So do I remove the strategy implementation now? I don't think this new owner will ever change how raises are given. But the application itself has demonstrated that this could happen. Of course this is just one example in an application where a new owner takes over and has simplified many processes. I could remove dozens of classes, interfaces and factories and make the whole application much more simple. Note that the current implementation does works just fine and the owner is happy with it (and surprised and even happier that I was able to implement her changes so quickly because of the discussed complexity). I admit that a small part of this doubt is because it is highly likely the new owner isn't going to use me any longer. I don't really care that somebody else will take this over since it has not been a big income generator. But I do care about 2 (related) things I care a bit that the new maintainer will have to think a bit harder when trying to understand the code. Complexity is complexity and I don't want to anger the psycho maniac coming after me. But even more I worry about a competitor seeing this complexity and thinking I just implement design patterns to pad my hours on jobs. Then spreading this rumor to hurt my other business. (I have heard this mentioned.) So... In general should previously needed complexity be removed even though it works and there has been a historically demonstrated need for the complexity but you have no indication that it will be needed in the future? Even if the question above is generally answered "no" is it wise to remove this "un-needed" complexity if handing off the project to a competitor (or stranger)?

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• Help Us Pick the First T-Shirt Design to Promote How-To Geek

  - by Eric Z Goodnight

  Here’s your first peek at How-To Geek’s new line of merchandise! Tell us what you think, what you like, and what you actually would like to own in this first round of potential HTG tee shirts. If you like the content here at HTG, we’d love to hear back from you—we made these for you, the readers, and we hope to hear what suits you and if you like what we’ve got to offer. Check them out, tell us your thoughts in the comments section (or send us emails at [email protected]) and fill out our poll in the section below.  The design that you like the most will be professionally printed and sold right here at howtogeek.com. Interested in buying one of them right now? Jump to the bottom to be notified when they’re ready for be bought and shipped right to you. How to Own Your Own Website (Even If You Can’t Build One) Pt 3 How to Sync Your Media Across Your Entire House with XBMC How to Own Your Own Website (Even If You Can’t Build One) Pt 2

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