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• bridge traffic limiting via tc

  - by jackhab

  I have a Linux machine running as a bridge simulating various network conditions. I use tc for this. Introducing delays or packet loss is quite simple but I got into trouble trying to configure bandwidth limiting. Can you, please, show me how to limit all the traffic going through my bridge without any special rules and condition, simply limit it to 1Mb/s? Thanks. PS Your favorite link to tc tutorial will be appreciated.

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• Losing connection to server from several computers

  - by user3696358

  I have a PostgreSQL server running Oracle Linux. In my network I have several workstations each running different OS (Fedora, Ubuntu, Windows). Every once in a while I lose connection from the several workstations to the server while other workstations can connect with no problem. If I do service network restart from the server the problem is solved and everyone can work until the next time it returns. Any clues? Thank you, Ben.

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• Ubuntu apt-get install linux-image

  - by Karl Kloppenborg

  I'd like someone to enlighten me as to what exactly goes on with aptitude when I want a kernel. As we all know, there's pretty much the following kernel option: linux-image-generic linux-image-server linux-image-virtual This morning I did an install and it had linux-image-generic on it, so I ran the following: apt-get -y remove linux-image-* This removed all my kernels as expected, I followed suit with running: apt-get install linux-image-virtual Says I've installed linux-image-server!? Am I missing something here, because I checked twice and it did it twice, however if I manually select a kernel (in my instance I used: linux-image-2.6.35-30-virtual) it will install linux-image-virtual. This seems rather strange to me? Details: Running Ubuntu 9.10 Am I missing something? :)

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• Dual-screen Multimedia Control Suite for Linux (like Screen Monkey)

  - by samjetski

  I'm looking for some linux software to manage and control a dual monitor/multi screen setup for use in professional-like presentations (ie: monitor1=control, monitor2=projector/audience). I have the dual-monitor configured with my gnome desktop running over both monitors (that's the easy part). What I'm looking for is a neat/seamless way to switch between, say, OpenOffice Impress, DVD Player, VLC live video, Lyricue, other software on monitor2. To have monitor2 shown to the audience and run neat presentations of DVDs, Slideshows, etc. whilst controlling it from monitor1. I can run slideshows, play a DVD on monitor2 (drag & drop VLC on monitor2, and go fullscreen) etc. but this is rather messy in a presentation environment. I found this software: Screen Monkey. Looks like an excellent windows equivalent for what I want to do. Is there anything similar for linux? For Gnome, KDE, anything else X based? Thanks, SamJ

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• My linux server time and log files are not the same

  - by Martin

  Hi i have installed NTP on my linux server and i am getting my clock from a 6500 core switch, everything is working fine. When i ssh to a switch i have it all sent to a log file on the linux server, this log file does not time stamp with the same time as i have on the server. the date and hwclock are the same. But my my is exatly 6 hours behind my date on the server wich is CET. Has annyone have that same problem ? bedst regards Martin

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• Disable linux read and write file cache on partition

  - by complistic

  How do i disable the linux file cache on a xfs partition (both read an write). We have a xfs partition over a hardware RAID that stores our RAW HD Video. Most of the shoots are 50-300gb each so the linux cache has a hit-rate of 0.001%. I have tryed the sync option but it still fills up the cache when copinging the files. ( about 30x over per shoot :P ) /etc/fstab: /dev/sdb1 /video xfs sync,noatime,nodiratime,logbufs=8 0 1 Im running debian lenny if it helps.

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• How does software installation in Linux work?

  - by Saif Bechan

  I am new to Linux and trying to set up a server. For this project I need some additional software, but how to install the software I'm interested in is not always obvious. For example, this was my experience with a PHP package called htscanner: There is no installation guide on the website. The website says that the version I used did not have any dependencies, but this is incorrect. "Release 0.8.1: No dependencies registered." There is no configuration guide on the website. After I managed to get it installed it still didn't work. I decided to just uninstall it and find a better solution. Uninstalling isn't straightforward; the best answer I got is to manually look for the files and delete them. What are the basic concepts of installing and uninstalling software on Linux? How is this supposed to work?

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• Linux Alternatives to Lansweeper [on hold]

  - by Mathew MacLean

  I'm new to serverfault, and I'm hoping that this is the correct section of StackExchange for this question. Currently in my network we have a collection of linux fileservers, firewalls, etc. with all windows clients. I am looking for a network management tool, similar to lansweeper that would be able to run on linux servers. I know questions asking for software suggestions are typically frowned upon, but I have looked high and low, and I'm starting to think nothing like this exists. So if anyone could point me in the right direction it would be greatly appreciated!

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• free open-source linux screenshot & ocr tool

  - by Gryllida

  I'm looking for a tool which would be able to capture a screen region, pass it to OCR and put the result into clipboard. "import ppm:- | gocr -i - | xclip -selection c" works, but gocr is unreliable: simple text on a webpage has errors. It is a clear font but the OCR tool always misses "r" and replaces it with underscore. "import ppm:- | ocrad -i - | xclip -selection c" says "ocrad: maxval 255 in ppm "P6" file." tesseract needs an image file and does not accept piping input to it. xfce4-screenshooter does not do OCR. ABBYY Screenshot Reader is proprietary. tessnet2 is freeware running on a proprietary platform. Google Docs can OCR screenshots in a batch. But my data is confidential and better not put online. Graphical interface solutions would be acceptable for this question, too. There is a number of existing SuperUser questions about OCR. They fall in several categories. Questions just about OCR without the "screenshot taking" part. Open Source OCR for linux Free OCR for Arabic text Looking for recommendations on OCR problem - tabular numeric data Which has better OCR applications: Ubuntu, or Mac/iPad, or Windows? How can I preform OCR from the command line? OCR solution on linux machine from command line (duplicate) Free OCR software OCR for Sanskrit ( OR devanagari) Copy image and paste to OCR (windows) File processing OCR instead of screenshot. Online OCR website for processing an entire pdf file at one time? Practical OCR solution for converting a large book to a digital format? How to extract text with OCR from a PDF on Linux? Batch-OCR many PDFs OCR Image based PDF Copy image and paste to OCR Extract OCR text from Evernote OCR in Word 2013 Replace (OCR) garbled text in PDF? Process files prior to running OCR. How can I make OCR recognize my documents' text better? Tesseract OCR recognition bilingual document. mistakes tolerance level setup OCR for low quality images How do I get the best quality screenshot for OCR (Optical Character Recognition) and what tool would be the best for screenshots? OCR training. Training Tesseract-OCR for english language fonts None of them answer this question.

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• Hardware selection for Linux machine

  - by bguiz

  Hi, I am building a new box, and planning to install Ubuntu 9-04 or Ubuntu 9-10 on it. I am wary of the hardware selection because in the past I struggled with lack of drivers or driver incompatibility with the network card and video card, etc. The last time I built a Linux box was 2007, and I have not kept up to date with the changes since. One notable difference is that I can no longer find motherboards with nVidia chip sets. See what I mean (links to my local shop's website): Intel motherboards: http://www.centrecom.com.au/catalog/default.php?page=1&cPath=36_62 AMD motherboards: http://www.centrecom.com.au/catalog/default.php?page=1&cPath=36_63 I have already checked the Ubuntu forums, but their motherboards section is rather outdated, and I did not look further. I would like to know your suggestions for what Linux compatible hardware that you have got. Thank you!

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• Which Linux distro for Mac Mini?

  - by spoon16

  I recently received a Mac Mini and would like to set it up as a web server and git source server. I would like to learn Linux so am interested in setting up my Mac Mini with Linux instead of OSX. Here are the main things that I will be using the Mac Mini for. git Repositories (via Gitosis) build server (build projects in git repositories using commit hooks and run tests) simple websites (PHP) learning C++ in a non-Windows environment What distribution would you recommend? Please provide some detail in your answer so that I can make an meaningful decision. Because I am looking to use the mini as more of a server than a normal desktop machine I was thinking of Ubuntu Server, I'm not sure if that is over kill though given the hardware I am using.

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• Which Linux distro for Mac Mini?

  - by spoon16

  I recently received a Mac Mini and would like to set it up as a web server and git source server. I would like to learn Linux so am interested in setting up my Mac Mini with Linux instead of OSX. Here are the main things that I will be using the Mac Mini for. git Repositories (via Gitosis) build server (build projects in git repositories using commit hooks and run tests) simple websites (PHP) learning C++ in a non-Windows environment What distribution would you recommend? Please provide some detail in your answer so that I can make an meaningful decision. Because I am looking to use the mini as more of a server than a normal desktop machine I was thinking of Ubuntu Server, I'm not sure if that is over kill though given the hardware I am using.

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• Should I be afraid of Linux server administration?

  - by markle976

  I've been trying to figure out what to focus on. I finally realized that the root of my quandary is that I am unsure about learning Linux server administration. I have been getting pretty good with PHP/MySQL and web development, but I am not very familiar with Linux. Is it hard to learn? What would I need to know in order to manage a LAMP stack? Also, which version is most used in enterprises? I think I have also hesitated to dive in because it seems like it is mostly used in small companies, but I guess that could be a good thing.

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• Which Linux distributions support IPv6?

  - by ebaccount

  Which Linux distributions support the IPv6 stack (like Windows Vista supports IPv6)?

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• PortForwarding to IIS in Linux

  - by Simon

  Hi, I am trying to set up port forwarding on a linux box to a IIS webserver on my internal network. The web server sits on Windows 2003 Server. My linux box has eth0 - Internet connection eth1 - internal subnet (10.10.10.x) eth2 - 2nd internal subnet (129.168.0.x) dhcp interface my webserver is on the eth2 interface (192.168.0.6) I am doing port forwarding for port 80 with no avail. I use the same set of rules to port forward to a different webserver and it works. The webapplication is available on the internal network but not for external users. iptables -t nat -A PREROUTING -p tcp -i eth0 -d $PUBLIC_IP --dport 80 -j DNAT --to 192.168.0.6:80 iptables -A FORWARD -p tcp -i eth0 -o eth2 -d 192.168.0.6 --dport 80 -m state --state NEW -j ACCEPT iptables -A FORWARD -t filter -o eth0 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT iptables -A FORWARD -t filter -i eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE Any Ideas?

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• Are drivers compatible between different Linux distributions?

  - by Dimitri C.

  If you have a device driver that works on one Linux distro, will it also work on another one?

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• Linux partitioning problem

  - by Claudiu

  I am using cfdisk to repartition my hdd as from OS install I only got 1 big partition a swap. I wanted to resize the big partition to 1 GB /boot and use the rest of the space for an extended partition. After I do cfdisk, I recheck the partitions with fdisk -l and I get these: Disk /dev/sda: 320 GB, 320070320640 bytes 255 heads, 63 sectors/track, 38913 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda3 1 38455 308881755 f Extended LBA Warning: Partition 3 does not end on cylinder boundary. /dev/sda2 38455 38698 1951897 82 Linux swap /dev/sda1 * 38699 38913 311349654 83 Linux My problem is the Warning message, I think I know the cause, I think its because of sda1 Blocks size. How could that be soo big if Start and End interval is small?

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• Learning Linux screencasts

  - by Dmitriy Nagirnyak

  Hi, I am trying to get started with Linux. There are number of books (many of which are just man pages), some of them provide good overview so I can dig deeper online then. What I would like is to find number of screencasts that would cover basics of Linux commands, server administration, commonly performed tasks etc (no GUI, only terminal). I want to watch the screencasts to "get it quicker" and then use a book or online resources to "dig it deeper". Any recommendations? Thanks, Dmitriy.

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• Where is Amazon Linux AMI Test Page EC2?

  - by fuzzybee

  I have set up my websites as directories directly under /var/www/html/ and they are working just fine (the websites are mapped to virtual hosts). So, this is mainly out of curiosity for the moment. Furthermore, being able to customise this might bring some benefits in the future e.g. branding the elastic IPs my computer use temporarily. Notes I can always create a index.html page under /var/www/html/ and modify it but that's not my goal here. I can also map the elastic IP address to a directory /var/www/html/default/ and do my stuffs there but that is not also my goal here My goal is the find the Amazon Linux AMI test page I've tried running Linux command to find it but it takes too long obviously

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• Aptana Under linux

  - by fatnjazzy

  Hey, I downloaded the Aptanastudio 2.0 and unzipped it in the desktop. Im trying to run Aptana studio 2.0 under OpenSuse 11 and i get the following error... Any idea y? Thanks JVM terminated. Exit code=-1 -Xms40m -Xmx384m -Djava.awt.headless=true -XX:MaxPermSize=256m -Djava.class.path=/home/avi/Desktop/Aptana Studio 2.0/plugins/org.eclipse.equinox.launcher_1.0.200.v20090520.jar -os linux -ws gtk -arch x86 -showsplash -launcher /home/avi/Desktop/Aptana Studio 2.0/AptanaStudio -name AptanaStudio --launcher.library /home/avi/Desktop/Aptana Studio 2.0/plugins/org.eclipse.equinox.launcher.gtk.linux.x86_1.0.200.v20090520/eclipse_1206.so -startup /home/avi/Desktop/Aptana Studio 2.0/plugins/org.eclipse.equinox.launcher_1.0.200.v20090520.jar -application com.aptana.ide.desktop.integration.Application -vm /usr/lib/jvm/java-1.6.0-openjdk-1.6.0/jre/bin/../lib/i386/client/libjvm.so -vmargs -Xms40m -Xmx384m -Djava.awt.headless=true -XX:MaxPermSize=256m -Djava.class.path=/home/avi/Desktop/Aptana Studio 2.0/plugins/org.eclipse.equinox.launcher_1.0.200.v20090520.jar

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• Can Linux file permissions be fooled?

  - by puk

  I came across this example today and I wondered how reliable Linux file permissions are for hiding information $ mkdir fooledYa $ mkdir fooledYa/ohReally $ chmod 0300 fooledYa/ $ cd fooledYa/ $ ls >>> ls: cannot open directory .: Permission denied $ cd ohReally $ ls -ld . >>> drwxrwxr-x 2 user user 4096 2012-05-30 17:42 . Now I am not a Linux OS expert, so I have no doubt that someone out there will explain to me that this is perfectly logical from the OS's point of view. However, my question still stands, is it possible to fool, not hack, the OS into letting you view files/inode info which you are not supposed to? What if I had issued the command chmod 0000 fooledYa, could an experienced programmer find some round about way to read a file such as fooledYa/ohReally/foo.txt?

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• Manage Upload Permissions, SFTP & Linux

  - by John R

  I'm new to Linux. I am working with a Redhat 5.5 server and am using a Java-based SFTP script that will allow multiple users to upload text files to a server. I am undecided if each user will have a separate directory or if I will use a naming convention that includes their customer ID. The files include some personal information about their LAN settings, so I prefer to use SFTP as apposed to FTP. It is my understanding that SFTP is encrypted (Also, I have a Java class configured to upload via SFTP, so I prefer not to switch protocols unless their is a very-good reason). The prototype is for a system that will support large numbers of customers and the thought of continually adding and removing clients through the command line seems highly impractical. (Again, I am new_to/learning Linux and Redhat). What are normal conventions for giving multiple users permission to SFTP upload files with a unique username and password for each.

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• Linux user that can read-only all files?

  - by ToiletOverflow

  Is it possible to create a user in Linux/Unix that can see all files on the system, but in a read-only capacity?

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• Removable vs fixed mount points in Linux

  - by Dave

  What makes a mount point removable in Linux? I am using Gentoo Linux with Gnome 3.2, and I find it annoying that some of my drives (ex: /dev/sdb) appear as removable but not the others (ex: /dev/sdc, /dev/sdd). They are all in /etc/fstab, with the same options. They are all mounted properly at startup, they all work fine under my own folders /mnt/drive2 /mnt/drive3 /mnt/drive4. But only one of them (the first) appears in Nautilus (and in the Gnome 3 notification tray) as mountable/removable, not the others. Can I add options to my fstab to hide it? Or can I probe using udevadm or whatever? It looks strange to be able to remove/unmount fixed drives that I never need to unmount nor remove. Any pointer would be good, thanks.

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• Linux - Imaging backup solution?

  - by xperator

  I want to know is there a way to make a snapshot-like backup of a linux system into a single file and restore it in another system ? You know in windows there are programs which makes a copy of a drive (like C:\ ) into a single image file. So you can restore this file later incase you are infected or something happens. Every time I want to migrate my vps into another host, I have to setup the new server from scratch and move the files manually. Can I just make a snapshot backup of the whole system and restore it somewhere else (or on the same server) ? I am not familiar with linux and I have no idea if this is technically possible or not ? Does the paritions, configs, system files,etc... are individual for each system ? I heard about rsync, but that's not what I am looking for.

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