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• Your favorite LiveCD

  - by sova

  Perhaps this is a question better suited for linux.se but since I have servers on all environments I was wondering what your favorite LiveCD is. Wiki defines this, for those unfamiliar, as a CD or DVD containing a bootable computer operating system. Live CDs are unique in that they have the ability to run a complete, modern operating system on a computer lacking mutable secondary storage, such as a hard disk drive. Live USB flash drives are similar to live CDs, but often have the added functionality of automatically and transparently writing changes back to their bootable medium. I tend to stick with Knoppix, and today I have to register the machine on the network before I can get any of my utilities running via IP. Any suggestions?

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• Wi-Fi connections gets Idle

  - by marcocamejo

  I am having this terrible problem. I have read a lot of people getting disconnected from the Network, it is not my case, I don't get disconnected, the connection just gets "idle" most of the time. It only works for short periods of time (seconds, a couple of minutes at most), then gets dead, then works again, and so on. It is annoying. I am using Ubuntu 11.10 on a Dell M5030 laptop. I have Windows 7 installed too, and of course with it, the wifi works perfectly. Any idea? advice?

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• Ubuntu VPN server setup

  - by framberries

  I followed the instructions that the answer on this thread gave, Easiest way to setup Ubuntu as a VPN server. However, I cannot get it to work. When I try to connect to my network, it just says the server cannot be reached. I setup the remote IP options (which I uncommented) to be 10.0.2.2-100. My router serves out 10.0.1.2-250. I also have users setup, but they are uncommented as well. I assume you need to uncomment them?

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• How do I duplicate a Box2d simulation, mid-simulation?

  - by Whyte

  I want to serialize the state mid-game, send it over the network to an identical computer (same CPU, same OS, same binary), load it there, and have the two games run in tandem doing the exact same simulation, without one of them drifting off and going haywire. In short: I want pop-in, pop-out networking support on my HIGHLY physics-intensive game, where sending object coordinates every few seconds is impossible, due to having thousands of objects, and many clients. I tried this with Box2D, and saving an object's location/velocity/etc wasn't enough... there's internal state that's not accessible through any public methods. My current workaround is to force EVERY client to save its entire worldstate and reload it from scratch, whenever a new player connects... but this is obviously bad practice, because it hangs the game for everyone whenever someone new connects. However, it works, with zero desynchronization. So, anyone know of any other techniques that can help me? Or should I just kiss my project goodbye?

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• Both bluetooth and wifi not connecting

  - by raff5184

  I'm having problems both with bluetooth and wifi, my pc is a Lenovo B5400. The BT can do a scan, but it isn't able to find any devices; I don't see any wifi network (but I have a working Ethernet connection). I read many topics on the internet but before trying different solutions and make some changes (I just installed Ubuntu 14.04) I would firstly try to understand what could the problem depend on. What are the commands I can use to see what's going on? Thank you in advance

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• How do I get a Realtek Wireless USB Airlink101 AWLL5088 working?

  - by Tobias_Mann

  I am running Ubuntu 11.10, 32bit. I ordered them a Realtek Airlink101 AWLL5088 based upon the relative ease for linux installation. I am having trouble installing the drivers. I copied the drivers to /usr/src/ and ran sudo ./install.sh from that director listed above. I have tried ndiswrapper, and allowing the default drivers, but with no luck. It seems to continue to try and use the default free drivers, even though I have blacklisted them using the guide described here. There was no error, I was asked which card I was using. I looked at the packaging and at the support page, and guessed number 2, allowed to finish, and rebooted. It continued detect the wireless network after the reboot, but would never complete the connection. I would appreciate any feedback. I am kind of stuck trying to figure this out.

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• WiFi is painfully slow, sometimes stops altogether

  - by Zelda64fan

  Lately my WiFi connection has been quite slow, and sometimes I lose my internet connection altogether (but the computer does not actually disconnect from the WiFi network). This only affects my laptop and only when it's running Ubuntu, so I think it must be a problem with Ubuntu. I haven't changed anything recently; this is on 12.10 64-bit. What could it be? Update: It's doing this now. The connection isn't completely dead, it's just staying under 5 kB/s. Still frustrating though. It also seems to affect all users.

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• How to redesign the UI of a large project?

  - by jem88

  I'm currently working at a quite big Android project (a social network, you can see it here if is useful to answer the question). We decided to restyle the whole app, changing all the UI design. The code I actually have is complex, there are many controllers, and it's a little messy too. Is it "better" in terms of time and code cleanliness to take one controller per time, and rewrite it entirely, or to modify one controller per time? The layout change entirely anyway, so for that I know I've to restart from scratch. Maybe it could seem a stupid question, but with the "time" variable I really can't see the best way.

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• Is It Possible for My Router to Wear Out?

  - by Jason Fitzpatrick

  Day after day your humble and hard working router holds your home network together and links it to the greater internet. Is it possible to work it to death? Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-drive grouping of Q&A web sites. HTG Explains: How Antivirus Software Works HTG Explains: Why Deleted Files Can Be Recovered and How You Can Prevent It HTG Explains: What Are the Sys Rq, Scroll Lock, and Pause/Break Keys on My Keyboard?

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• How to properly code in Unity? [on hold]

  - by Vincent B.

  I'm fairly new to Unity (yet I touched it and made a few proto with it) and I'd like to know how I'm supposed to work with it. I'm student in programming so I'm used to C/C++ with SDL/SFML, writing code and only using Input/Graphics/Network libs. I followed a few Unity guides and it was way more around drag & drop on scenes and a bit of scripting to activate it all, which disturbed me. So I fond a way to only use one GameObject and use a Singleton to launch code and display stuff (for 2d games at least). At the end of the day I make games not using "Instantiate" or such at all. Is it the right way ? Am I supposed to do this ? How much are your scenes populated (in a professional environment) ? When should I stop coding and start using the editor ?

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• How can I build this payment receipt/booking application?

  - by Festus

  I'm planning to build a payment receipt/booking application for a media company with several branches in different locations. The application should be able to move data across the network/internet to a central database where the administrator/accountant in a different location will be able to see the result of the entire job for the day from each branch. Application will run on windows environment. Will be able to send result of the booking to a Point Of Sales printer for print output. Now, I'm confused about choosing the right programming language to accomplish this task. I'm between beginner/intermediate level in PHP, I know HTML/CSS and JavaScript. I have tried to do this in PHP but, I'm face with several challenges and I fear for the POS part since PHP application run on the web browser. I don't know if python will be best suited for this and how long will it take someone with my experience level to pick up python. Any suggestion will be highly appreciated.

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• Access samba shares befor login

  - by everlearnin

  I installed Ubuntu 12.10 on an old Compaq C300. I want to use it to share my movies over lan so that the rest of my family can watch without hi-jacking my pc. I installed samba and shared the Public folder under the Home folder of my user account. But I can only access this folder from my Win 7 pc when I am logged in. If I log out or restart without logging in then I cannot access the shared folder. I am used to the Windows service that starts at boot making shared files available over the network before the user has logged in. How can I accomplish this in Ubuntu?

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• Juniper setup on 12.04

  - by Lauran

  I have a laptop with Windows XP and Ubuntu 12.04 (32 bits). Until now, I used Windows XP to connect to a Juniper VPN but now I'd like to try it with Linux. I read the mad scientist walkthrough (including the sun java part) but I can't run the setup. I get the popup that ask me if I'm sure I want to run the applet but then, nothing. mad-scientist says it's probably a C runtime lib problem and suggests to use his script with -nojava but he doesn't say how to install Network Connect in the first place. Any idea? Thanks for any suggestion! Laurian PS: I have: Ubuntu 12.04 32bits Java from Sun 1.6.0.32 Firefox 12 xterm (I think it was suggested somehwere)

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• BCM4313 partially working on Toshiba Satellite R630 (Ubuntu 12.10)

  - by Denis

  New to Ubuntu. During installation, the computer identified the wifi card and asked me to connect to the network. I did. After the first restart the wifi was working and I could see networks and connect to them. After the second restart the wireless has VANISHED. Still, the Broadcom STA drivers are enabled in system settings/additional drivers. Tried to restart 5 more times- no effect. I have studied very many topics on askubuntu but none of them work.

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• cVidya’s MoneyMap Achieves Oracle Exadata Optimized Status

  - by Javier Puerta

  cVidya's MoneyMap running on Oracle Exadata provides extreme performance, including 4x-16x improvement in high data load rates, 4x faster data transformation and reconciliation, and query speeds - from a 2.5 billion record index –  improved from hours to few seconds! The MoneyMap solution enables operators to reconcile information from all network, operations and business support systems and through an on-going automated process, it detects problem areas which impact profitability as a result of revenue leakage, data inconsistencies or resources that are not being used efficiently. Once detected, MoneyMap provides tools to promptly correct and manage the problems to achieve profit maximization Learn more here.

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• Good Bye FY'14

  - by rajeshr

  As we welcome Fiscal Year 2015 at Oracle, looking forward to an exciting times ahead, let me take a moment to reflect on the last few laps of the FY'14. No better way to do that putting up pictures that speaks thousand words. A huge batch who attended back to back programs on Solaris 11 Network Administration, Solaris ZFS Administration, Solaris Zone Administration (19 - 30 May 2014) at Hyderabad. Transition to Solaris 11 session (5-9 May 2014) at Hyderabad. Exadata Install & Maintenance session (28 April - 2 May 2014) at Singapore.

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• Tweaking Hudson memory usage

  - by rovarghe

  Hudson 3.1 has some performance optimizations that greatly reduces its memory footprint. Prior to this Hudson used to always hold the entire data model (all jobs and all builds) in memory which affected scalability. Some installations configured heap sizes in excess of 1GB to counteract this. Hudson 3.1.x maintains an MRU cache and only loads jobs and builds as they are required. Because of the inability to change existing APIs and be backward compatible with plugins, there were limits to how far we could go with this approach. Memory optimizations almost always come with a related cost, in this case its additional I/O that has to be performed to load data on request. On a small site that has frequent traffic, this is usually not noticeable since the MRU cache will usually hold on to all the data. A large site with infrequent traffic might experience some delays when the first request hits the server after a long gap. If you have a large heap and are able to allocate more memory, the cache settings can be adjusted to take advantage of this and even go back to pre-3.1 behavior. All the cache settings can be passed as options to the JVM container (Tomcat or the default Jetty container) using the -D option. There are two caches, independant of each other, one for Jobs and the other for Builds. For the jobs cache: hudson.jobs.cache.evict_in_seconds ( default=60 ) Seconds from last access (could be because of a servlet request or a background cron thread) a job should be purged from the cache. Set this to 0 to never purge based on time. hudson.jobs.cache.initial_capacity ( default=1024 ) Initial number of jobs the cache can accomodate. Setting this to the number of jobs you typically display on your Hudson landing page or home page will speed up consecutive access to that page. If the default is too large you may consider downsizing and using that memory for the Builds cache instead. hudson.jobs.cache.max_entries ( default=1024) Maximum number of jobs in the cache. The default is large enough for most installations, but if you find I/O activity when always accessing the hudson home page you might consider increasing this, but first verify if the I/O is caused by frequent eviction (see above), rather than by the cache not being large enough. For the builds cache: The builds cache is used to store Build objects as they are read from storage. Typically this happens when a user drills down into the details of a particular Job from the hudson hom epage. The cache is shared among builds for different jobs since in most installations all jobs are not accessed with the same frequency, so a per-job builds cache would be a waste of memory. hudson.job.builds.cache.evict_in_seconds ( default=60 ) Same as the equivalent Job cache, applied to Build. hudson.job.builds.cache.initial_capacity" ( default=512 ) Same as equivalent Job cache setting. Note the smaller initial size. If your site stores a large number of builds and has frequent access to more builds you might consider bumping this up. hudson.job.builds.cache.max_entries ( default=10240 ) The default max is large enough for most installations, the builds cache has bigger sized objects, so be careful about increasing the upper limit on this. See section on monitoring below. Sample usage: java -jar hudson-war-3.1.2-SNAPSHOT.war -Dhudson.jobs.cache.evict_in_seconds=300 \ -Dhudson.job.builds.cache.evict_in_seconds=300 Monitoring cache usage The 'jmap' tool that comes with the JDK can be used to monitor cache performance in an indirect way by looking at the number of Job and Build objects in each cache. Find the PID of the hudson instance and run $ jmap -histo:live <pid | grep 'hudson.model.*Lazy.*Key$' Here's a sample output: num #instances #bytes class name 523: 28 896 hudson.model.RunMap$LazyRunValue$Key 1200: 3 96 hudson.model.LazyTopLevelItem$Key These are the keys to the Jobs (LazyTopLevelItem$Key) and Builds (RunMap$LazyRunValue$Key) in the caches, so counting the number of keys is a good indicator of the number of items in the cache at any given moment. The size in bytes can be ignored, they are just the size of the keys, not the actual sizes of the objects they hold. Those sizes can only be obtained with a profiler. With the output above we can conclude that there are 3 jobs and 28 builds in memory. The 28 builds can all be from 1 job or all 3 jobs. Over time on an idle system, these should get evicted and memory cache should be empty. In practice, because of background cron threads and triggers, jobs rarely fall down to zero. Access of a job or a build by a cron thread resets the eviction timer.

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• Getting wireless N to work on Dell Vostro 3300?

  - by luisfpg

  I have a Dell Vostro 3300, which has a Broadcom BCM4313 wireless. The point is that I cannot make it work in N mode. NetwotkManager applet says I'm on 54 Mbit/s. Of course, my wireless router is N capable. I've double checked. Anyone knows what to do? Here is the output for lspci -v: 12:00.0 Network controller: Broadcom Corporation BCM4313 802.11b/g/n Wireless LAN Controller (rev 01) Subsystem: Dell Device 0010 Flags: bus master, fast devsel, latency 0, IRQ 17 Memory at fbb00000 (64-bit, non-prefetchable) [size=16K] Capabilities: <access denied> Kernel driver in use: wl Kernel modules: wl, brcm80211 Thanks a lot.

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• How to minimize the data loss when laying off a programmer?

  - by thursdaysgeek

  I was just laid off and it was the standard process that is used in the US: call the person to talk to personnel, and remove access to the network while that is going on, then have someone help pack, always have someone with the person until they are escorted from the property. That is supposed to keep an unhappy developer from deleting or damaging software or data: to mimimize data loss. However, it still results in a lot of data loss, as all of the work the programmer was working on is dropped: software not checked in is possibly lost, documents not finished are lost, releases in process are slowed down or stopped, and a huge amount of knowledge could be lost. It seems the potential data loss is more than offset by the actual data loss. How can all losses, both potential and actual, be mimimized?

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• Tilgin Improves Subscriber Device Management with Embedded MySQL

  - by Bertrand Matthelié

  Tilgin IPRG AB develops and delivers systems and software for the digitally-connected home. Using Tilgin home gateway software, as well as central software for remote control and operation of the network, Tilgin’s customers can offer their subscribers broadband services. The company has over 100 customers,  telecommunications and broadband operators, in more than 30 countries.Tilgin needed a robust and scalable database solution for its auto-configuration server (ACS) product, tGem, used by its customers to manage the devices that provide their subscribers with access to television, internet, telephony, and other services. Tilgin chose MySQL as embedded database. This made it possible for Tilgin’s customers to easily and smoothly implement new generations of services, as well as to easily add new subscribers, ultimately enabling the company to save time and money. Read the case study here.

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• can't open youtube or vimeo

  - by wrt

  I can't open Youtube.com on computer with lubuntu and mint. I see that my flash works properly on other sites. Problem is in for example on youtube (yming.com loading without endless) and vimeo. I tried to use firefox and chromium. I thought that it would be problem with dns (I have dns from DHCP - opendns) so I changed to google dns but it didn't help to solve problem. When I use text browser - Links these site are opening well in text mode. I think that the problem is with flash or java. On other computer with windows connected to the same network these sites are being opened without problem. I am on the point that I don't know what to do next, because I tried to install and uninstall flash several times. I tried Flash-Aid as well.

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• Unable to access media wiki pages from another computer?

  - by Kathiresan Jeyapandian

  I have set up a web server in my Windows 7 with easyPHP. The website works fine when I browse the locally via localhost or 127.0.0.1. But, unable to open the site from another computer which is in the same LAN or in connected to my LAN. My local IP is in the 10.x.x.x range. The firewall turned off on my private network. I've also tried by changing Listen 127.0.0.1:80 to Listen 80 In httpd.conf but still i'm unable to access the media wiki from other machines. Unable to browse the pages from other machines using localhost or using IP address (Ex: 10.x.x.x). Could you please let me know your suggestions and comments?

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• Parallel Threading in Multi-Language Software?

  - by Smarty Twiti

  I'm developing a software that contain many modules/Daemon running in parallel manner, what i'm looking for is how to implement that, i cannot use Thread because some of those modules/Daemon are perhaps implemented in other languages (C,java,C#...). For example I'm using C for Hooking Messages exchanged between Windows kernel and top level applications, Java/C# to use some free library to simply parse XML(for example) or to accept and execute commands over the network..this can be done by C Language but just to improve productivity... Finally for GUI I'm using Ultimate++ (c++) that is like the main process that call and monitor(activate/deactivate/get state) of all other modules/Daemon through an interface. I admit that the development of each module/Daemon in a separate language greatly facilitates maintenance, but especially I am obliged to do that.. What is the best practice way to do that ? All helps will be appreciated.

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• Data structure for file search

  - by poly

  I've asked this question before and I got a few answers/idea, but I'm not sure how to implement them. I'm building a telecom messaging solution. Currently, I'm using a database to save my transaction/messages for the network stack I've built, and as you know it's slower than using a data structure (hash, linkedlist, etc...). My problem is that the data can be really huge, and it won't fit in the memory. I was thinking of saving the records in a file and the a key and line number in a hash, then if I want to access some record then I can get the line number from the hash, and get it from the file. I don't know how efficient is this; I think the database is doing a way better job than this on my behalf. Please share whatever you have in mind.

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• Installing VMware Worstation/Player 8.0.4 on Ubuntu 12.10 fails to load with Unable to start services

  - by user106986

  I have been attempting to install this application for a few weeks without any success. I have installed and uninstalled the application and pathes with no change. I have even tried to load a VM in Virtualbox and install the application there to a base install of Ubuntu 12.10 and it still did not install. I have downloaded the patch and modified it to reflect the version of VMware Worstation and Player I am installing. I still receive the same error I saw in the first attempt to install the software. Which leads me to think that I am missing something. The error is: Unable to start services. See log file /tmp/vmware-root/modconfig-7674.log for details. I have the output of the log file if that will help. According to the dialogue box Virtual Network Device and VMware Blocking Filesystem fail to either load or execute. Any help would be greatly appreciated.

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