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• Enable live streaming on website

  - by Somebody

  I have a server colocated in a datacentre (dedicated 1Gbit line, SSDs, etc.) running CentOS 5.4 64-bit. I want to stream live video from a device (webcam, camcorder, whatever.) to my server which inturn can re-broadcast it on demand through a flash player (such as Flowplayer) so that more users will be able to watch the stream since the server is quite fast. Does a solution like this exist already (streaming software from live source to flash media server) or will I need to hire someone to code it? I see that VLC has an option to stream video.. will that be suitable in this case? Or is there a better way to do it? I don't want a browser based solution on my end. It'll be great if this can be done without running an X server but I don't mind either way. This will be running on a dedicated PC at home.

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• How do I get a Dell Latitude e6420 working?

  - by David_G

  I've just installed Ubuntu 12.04 (64-bit) on a brand new Dell Latitude e6420, and I'm having a few problems. This laptop has an Optimus (?) setup - i.e. integrated gfx and an Nvidia Quadro NVS 4200M. First problem - I ran setup, etc, and discovered that I can only run unity2d - If I try and login with unity3d, it just defaults to 2d. This is with nvidia-current installed (302.07). Note also that I can't run nvidia-settings ("You do not appear to be using the NVIDIA X driver."), and there is no additional drivers found ("No proprietary drivers are in use on this system"). I tried to troubleshoot this, and removed nvidia, leaving (I guess) just Nouveau drivers - In that case, unity3d did work, but I was stuck with the open source Nouveau drivers powering the integrated graphics. So, obviously, I want to run unity3d, and be using the more powerful Nvidia graphics card. I've tried a bit of tinkering around, but I'm not sure the best way to proceed, or perhaps more importantly, I'm not sure of what the best final solution might be. I've heard about bumblebee - but frankly, I would prefer to have the proprietary Nvidia drivers working properly. Any help would be much appreciated!

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• Minimum percentage of free physical memory that Linux require for optimal performance

  - by csoto

  Recently, we have been getting questions about this percentage of free physical memory that OS require for optimal performance, mainly applicable to physical compute nodes. Under normal conditions you may see that at the nodes without any application running the OS take (for example) between 24 and 25 GB of memory. The Linux system reports the free memory in a different way, and most of those 25gbs (of the example) are available for user processes. IE: Mem: 99191652k total, 23785732k used, 75405920k free, 173320k buffers The MOS Doc Id. 233753.1 - "Analyzing Data Provided by '/proc/meminfo'" - explains it (section 4 - "Final Remarks"): Free Memory and Used Memory Estimating the resource usage, especially the memory consumption of processes is by far more complicated than it looks like at a first glance. The philosophy is an unused resource is a wasted resource.The kernel therefore will use as much RAM as it can to cache information from your local and remote filesystems/disks. This builds up over time as reads and writes are done on the system trying to keep the data stored in RAM as relevant as possible to the processes that have been running on your system. If there is free RAM available, more caching will be performed and thus more memory 'consumed'. However this doesn't really count as resource usage, since this cached memory is available in case some other process needs it. The cache is reclaimed, not at the time of process exit (you might start up another process soon that needs the same data), but upon demand. That said, focusing more specifically on the percentage question, apart from this memory that OS takes, how much should be the minimum free memory that must be available every node so that they operate normally? The answer is: As a rule of thumb 80% memory utilization is a good threshold, anything bigger than that should be investigated and remedied.

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• what to do when ctrl-c can't kill a process?

  - by Dustin Boswell

  Ctrl-c doesn't always work to kill the current process (for instance, if that process is busy in certain network operations). In that case, you just see "^C" by your cursor, and can't do much else. What's the easiest way to force that process to die now without losing my terminal? Summary of answers below: Usually, you can Ctrl-z to put the process to sleep, and then do "kill -9 process-pid", where you find the process's pid with 'ps' and other tools. On Bash (and possibly other shells) you can do "kill -9 %1" (or '%N' in general) which is easier. If Ctrl-z doesn't work, you'll have to open another terminal and kill from there.

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• How soon does nginx's token bucket replenish when limiting at requests per minute?

  - by Michael Gorsuch

  We've decided that we want to experiment and limit requests per minute instead of requests per second on our sites. However, I am confused by the burst parameter in this context. I am under the impression that when you use the 'nodelay' flag, the rate limiting facility acts like a token bucket instead of a leaky bucket. That being the case, the bucket size is equal to the burst parameter, and every time that you violate the policy (say 1 req/s), you have to put a token in the bucket. Once the bucket is full (being equal to the burst setting), you are given a 503 error page. I am also under the impression that once a violator stops going against the policy, a token is removed from the bucket at a rate of 1 token/s allowing him to regain access to the site. Assuming that I have the above correct, my question is what happens when I start regulating access per minute? If we chose 60 requests per minute, at what rate does the token bucket replenish?

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• Why some recovery tools are still able to find deleted files after I purge Recycle Bin, defrag the disk and zero-fill free space?

  - by Ivan

  As far as I understand, when I delete (without using Recycle Bin) a file, its record is removed from the file system table of contents (FAT/MFT/etc...) but the values of the disk sectors which were occupied by the file remain intact until these sectors are reused to write something else. When I use some sort of erased files recovery tool, it reads those sectors directly and tries to build up the original file. In this case, what I can't understand is why recovery tools are still able to find deleted files (with reduced chance of rebuilding them though) after I defragment the drive and overwrite all the free space with zeros. Can you explain this? I thought zero-overwritten deleted files can be only found by means of some special forensic lab magnetic scan hardware and those complex wiping algorithms (overwriting free space multiple times with random and non-random patterns) only make sense to prevent such a physical scan to succeed, but practically it seems that plain zero-fill is not enough to wipe all the tracks of deleted files. How can this be?

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• Does Windows Move command delete the file only on successful completion?

  - by IronicMuffin

  This may be a stupid question, but I'm erring on the side of caution here. If I'm using Windows command line/batch files to Move a file from one server to another and we have a network failure, what will happen to the original file? I would assume it remains untouched until fully moved, and then deleted, but I need to be sure. My fear is that it deletes bytes as they are moved, which would be bad. If that isn't the case, is there a better way than Copying the file and Deleting after the copy completes? Thanks for your help. EDIT: I suppose super user would have been better. This is part of a job kicked off by code, so my first thought was to come here.

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• How do I kill a process that keeps respawning?

  - by terabytest

  I got infected by a virus. It looks like I removed it, but it somehow injected a few more processes (I can see them in the task manager) that respawn when I kill them (somehow). Is there a way to destroy those process to stop them from respawning, or in the case something else is respawning them, to kill that "something"? I really don't want to format my pc for this. The data in it is very important for me (personal value) so I'd really want to know a way to do this without reinstalling my OS. I'm on Windows Vista 32 bits.

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• add script on boot linux machine

  - by user1546679

  I have one script to start a service on my ubuntu. I added it on boot machine using "# update-rc.d projeto defaults". But it still doesn't start with the boot machine. I think is because I am using other user to start the script "su - www-data -c ...". But I am not sure, because I run the update-rc.d command as root. When I execute the script from a terminal, it asks the password of the user www-data. Does anyone know what is happening? Thanks a lot! Felipe #!/bin/bash # /var/www/boinc/projeto/bin/start function action { su - www-data -c "/var/www/boinc/projeto/bin/$1" } case $1 in start|stop|status) action $1 ;; *) echo "ERRO: usar $0 (start|stop|status)" exit 1 ;; esac

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• New Write Flash SSDs and more disk trays

  - by Steve Tunstall

  In case you haven't heard, the Write SSDs the ZFSSA have been updated. Much faster now for the same price. Sweet. The new write-flash SSDs have a new part number of 7105026 , so make sure you order the right ones. It's important to note that you MUST be on code level 2011.1.4.0 or higher to use these. They have increased in IOPS from 6,000 to 11,000, and increased throughput from 200MB/s to 350MB/s.    Also, you can now add six SAS HBAs (up from 4) to the 7420, allowing one to have three SAS channels with 12 disk trays each, for a new total of 36 disk trays. With 3TB drives, that's 2.5 Petabytes. Is that enough for you? Make sure you add new cards to the correct slots. I've talked about this before, but here is the handy-dandy matrix again so you don't have to go find it. Remember the rules: You can have 6 of any one kind of card (like six 10GigE cards), but you only really get 8 slots, since you have two SAS cards no matter what. If you want more than 12 disk trays, you need two more SAS cards, so think about expansion later, too. In fact, if you are going to have two different speeds of drives, in other words you want to mix 15K speed and 7,200 speed drives in the same system, I would highly recommend two different SAS channels. So I would want four SAS cards in that system, no matter how many trays you have. 

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• rsync : Read input from a file and sync accordingly

  - by Dheeraj

  I have a text file which contains the list of files and directories that I want to copy (one on a line). Now I want rsync to take this input from my text file and sync it to the destination that I provide. I've tried playing around with "--include-from=FILE" and "--file-from=FILE" options of rsync but is is just not working I also tried pre-fixing "+" on each line in my file but still it is not working. I have tried coming with various filter PATTERNs as outlined in the rsync man page but it is not working. Could someone provide me correct syntax for this use case. I've tried above things on Fedora 15, RHEL 6.2 and Ubuntu 10.04 and none worked. So i am definitely missing something. Many thanks.

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• Mac OS X 10.5/6, authenticate against by NIS or LDAP when both servers have your username

  - by Wang

  We have an organization-wide LDAP server and a department-only NIS server. Many users have accounts with the same name on both servers. Is there any way to get Leopard/Snow Leopard machines to query one server, and then the other, and let the user log in if his username/password combination matches at least one record? I can get either NIS authentication or LDAP authentication. I can even enable both, with LDAP set as higher priority, and authenticate using the name and password listed on the LDAP server. However, in the last case, if I set the LDAP domain as higher-priority in Directory Utility's search path and then provide the username/password pair listed in the NIS record, then my login is rejected even though the NIS server would accept it. Is there any way to make the OS check the rest of the search path after it finds the username?

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• What does SVN do better than git?

  - by doug

  No question that the majority of debates over programmer tools distill to either personal choice (by the user) or design emphasis, i.e., optimizing design according to particular uses cases (by the tool builder). Text Editors are probably the most prominent example--a coder who works on a Windows at work and codes in Haskell on the Mac at home, values cross-platform and compiler integration and so chooses Emacs over Textmate, etc. It's less common that a newly introduced technology is genuinely, demonstrably superior to the extant options. I wonder if this is in fact the case with version-control systems, in particular, centralized VCS (CVS, SVN) versus distributed VCS (git, hg)? I used SVN for about five years, and SVN is currently used where I work. A little less than three years ago, I switched to git (and gitHub) for all of my personal projects. I can think of a number of advantages of git over subversion (and which for the most part abstract to advantages of distributed over centralized VCS), but I cannot think of one contra example--some task (that's relevant and arises in a programmers usual workflow) that subversion does better than git. The only conclusion I have drawn from this is that I don't have any data--not that git is better, etc. My guess is that such counter-examples exist, hence this question.

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• Sorting Algorithm : output

  - by Aaditya

  I faced this problem on a website and I quite can't understand the output, please help me understand it :- Bogosort, is a dumb algorithm which shuffles the sequence randomly until it is sorted. But here we have tweaked it a little, so that if after the last shuffle several first elements end up in the right places we will fix them and don't shuffle those elements furthermore. We will do the same for the last elements if they are in the right places. For example, if the initial sequence is (3, 5, 1, 6, 4, 2) and after one shuffle we get (1, 2, 5, 4, 3, 6) we will keep 1, 2 and 6 and proceed with sorting (5, 4, 3) using the same algorithm. Calculate the expected amount of shuffles for the improved algorithm to sort the sequence of the first n natural numbers given that no elements are in the right places initially. Input: 2 6 10 Output: 2 1826/189 877318/35343 For each test case output the expected amount of shuffles needed for the improved algorithm to sort the sequence of first n natural numbers in the form of irreducible fractions. I just can't understand the output.

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• IDE Motherboard to Boot from a SATA 1T Hdd

  - by JavaMan

  I want to use my SATA HDD in my very old ASUS A7V8X-X motherboard (made in 2003). I intended to buy a cheap adapter for this. Say something similar to this one: http://www.cooldrives.com/satoidecofor.html But would there be any issue if I want to boot from this SATA drive? My impression is that these kind of adapters convert SATA signal and commands to PATA directly and such a low level conversion should be transparent to the motherboard and BIOS - in case the BIOS doesn't support SATA. And, for my motherboard, it sure doesn't. Does anyone ever used such a kind of adapter to support a boot drive? Any success sorry?

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• Read ahead buffering while playing video file from optical disc

  - by Saxtus

  I was wondering if there is a program for Windows 7 (64-bit), that reads ahead the file to be played back (usually MKV files in my case) to the RAM, so the disc that the video file resides in, won't spin for the entire duration of the playback, but only every time the cache is almost empty (with big enough cache so it won't need the drive for long periods). A program that I've used in the past (called DVDIdle), was doing that universally for every video player I wanted, but they've stopped updating it 6 years ago and now it doesn't seem to work with Windows 7 (tried using compatibility mode too). The method I am using now, is to either have the drive wearing down and buzzing all the time or manually copy the entire file to HDD, SSD or RamDisk and play it from there. The closest thing I've found, is a software that slows down the drive's spin speed, but I was looking for something more convenient, automated, without waiting for an entire file to be copied before starting playback or needing any HDD space, like I've used to in the past. Thanks in advance.

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• e-mail no longer coming to aol inbox since I opened a Hotmail account [closed]

  - by Dave

  I recently set up an email account with Hotmail. I have used AOL e-mail for years and would like to keep this as my main source for sending/receiving e-mail. When I set up the Hotmail account there was an option to have all my e-mail accounts forwarded to the Hotmail inbox. I set up this option and the page promised that all incoming mail would still be visible in the original inbox, in this case my AOL account. Well everything does come to the Hotmail account, the only problem is that I no longer receive these e-mails in my primary/desired location which is AOL. I went back and made sure the box was checked that provided the option through Hotmail that said "leave a copy of my messages on the server" (AOL) How do I get the e-mail that is being forwarded to Hotmail from my AOL account to still be visible in AOL, it should be in AOL inbox as that is the original destination but it is gone. Suggestions?

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• Can I create a DC without a DNS Server?

  - by onik

  So as the title says, I need to promote a standalone Win2008R2 server to a Domain Controller, and I don't a DNS Server (I think), as there will be no clients connected to the domain, it will be only used for Remote Desktop Services. Yes, I know, it's considered bad practice to install other roles on the DC, but in this case, it's necessary. Do I need to install the DNS Server, and if I do, how to make it as transparent as possible? EDIT: Seems that I need to install the DNS Server, so I can I configure it not to mess up my entire domain? For example: The server I need to promote is rdc.mydomain.com, and it has an A entry to it's IP in the current DNS, while other servers under mydomain.com are running Linux and don't need to know anything about this Windows box. The domain uses a third-party DNS and all edits and updates need to be done via a separate web page, our servers don't have write/update access.

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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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• Nginx save file to local disk

  - by Dean Chen

  My case is: In our China company, we have to access one web server in USA headquarter through Internet. But network is too slow, and we download many big image files. All our developers have to wait. So we want to setup a Nginx which acts as reverse proxy, its upstream is our USA web server. Question is can we make Nginx save the image files from USA web server into its local disk? I mean let Nginx act as one cache server.

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• XNA 2D Top Down game - FOREACH didn't work for checking Enemy and Switch-Tile

  - by aldroid16

  Here is the gameplay. There is three condition. The player step on a Switch-Tile and it became false. 1) When the Enemy step on it (trapped) AND the player step on it too, the Enemy will be destroyed. 2) But when the Enemy step on it AND the player DIDN'T step on it too, the Enemy will be escaped. 3) If the Switch-Tile condition is true then nothing happened. The effect is activated when the Switch tile is false (player step on the Switch-Tile). Because there are a lot of Enemy and a lot of Switch-Tile, I have to use foreach loop. The problem is after the Enemy is ESCAPED (case 2) and step on another Switch-Tile again, nothing happened to the enemy! I didn't know what's wrong. The effect should be the same, but the Enemy pass the Switch tile like nothing happened (They should be trapped) Can someone tell me what's wrong? Here is the code : public static void switchUpdate(GameTime gameTime) { foreach (SwitchTile switch in switchTiles) { foreach (Enemy enemy in EnemyManager.Enemies) { if (switch.Active == false) { if (!enemy.Destroyed) { if (switch.IsCircleColliding(enemy.EnemyBase.WorldCenter, enemy.EnemyBase.CollisionRadius)) { enemy.EnemySpeed = 10; //reducing Enemy Speed if it enemy is step on the Tile (for about two seconds) enemy.Trapped = true; float elapsed = (float)gameTime.ElapsedGameTime.Milliseconds; moveCounter += elapsed; if (moveCounter> minMoveTime) { //After two seconds, if the player didn't step on Switch-Tile. //The Enemy escaped and its speed back to normal enemy.EnemySpeed = 60f; enemy.Trapped = false; } } } } else if (switch.Active == true && enemy.Trapped == true && switch.IsCircleColliding(enemy.EnemyBase.WorldCenter, enemy.EnemyBase.CollisionRadius) ) { //When the Player step on Switch-Tile and //there is an enemy too on this tile which was trapped = Destroy Enemy enemy.Destroyed = true; } } } }

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• FOSS Development: Who develops the OS-specific packages?

  - by achristi

  I have a couple of FOSS projects. They can be a bit of a pain to get running unless you've got dependencies in place already, which I figure is par for the course for FOSS projects. We know that each free operating system out there has its own package management systems. A few of them, such as homebrew on Mac OS or AUR on Arch linux are very friendly to community contributions. What I am wondering is, who exactly is expected to contribute packages? Primarily I am concerned with the case of small or developing projects, since it's pretty standard for the big projects to be put in there by the OS maintainers. From my perspective, it is something of a chicken-egg problem, because your software will not make its way into a package system if it does not have users, and it is less likely to gain users if it is not easy to install and use. For the sake of discussion, let's assume that the software in question is actually legitimately useful. I can see where people could create crapware or spam and that should obviously be kept out of any package system. So, in summary, whose job is this? Is it spammy for a FOSS software dev to put his own work into various OS package repositories?

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• Puppet causes endless restarts of CUPS (how does one prevent this)

  - by Purfideas

  Hi! It makes sense, and is in fact suggested on this site, to have a critical file change trigger a service restart with puppet meta-parameters (such as notify or subscribe). For example: ## file definition for printers.conf file { "/etc/cups/printers.conf": [snip], source => "puppet:///module/etc/cups/printers.conf" } ## service definition for sshd service { 'cups': ensure => running, subscribe => File['/etc/cups/printers.conf'] } But in the case of CUPS, this triggers and endless loop of restarts; the logic works like this: Change puppetmaster's version of /etc/cups/printers.conf puppetmaster pushes new version to client, triggering cups restart cupsd restart insists on putting its own time stamp at the top of printers.conf, 'Written by cupsd...' This change will be seen as out of date, so after runinterval, we return to (1). Is there a way to suppress cupsd's need to time stamp the file? Or is there a puppet trick that could help here? Thanks!

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• Linux kernel startup problems: how to analyze?

  - by java.is.for.desktop

  Hello, everyone! After manually updating the kernel from 2.6.33 to 2.6.34 on my OpenSuse 11.2 Notebook, it stops after the message Loading drivers, configuring devices... This stop can be interrupted with Ctrl-C, but when the system enters runlevel 5, no partitions are mounted (but the root partition), many services fail to start, and other strange things are going on. No X11. NOTE: I manually updated the kernel many times before, it worked. Yes, I know, in case of NVidia, the driver has to be recompiled. The question is: How can I analyze the cause of the problem? Doing dmesg gives me soooo much output, I can't "map" it to the output which I see at startup. The output does not contain the string Loading drivers, configuring devices, or similar.

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• Leave Windows Session Logged On

  - by Kyle Brandt

  Is a bad idea for any reason to leave accounts logged onto Windows remote desktop sessions? So instead of logging off, just closing the session so it locks. In this case, the limited number of remote desktop connections is not an issue. I am just wondering if anyone has seen sessions leak memory over time or maybe security issues with doing this, etc... I could see if programs were left open they might suck up and or leak memory, but has anyone seen this with Microsoft software such as Control Panels, Management Consoles, and Exchange System Administrator?

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