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  • Algorithms behind load-balancers?

    - by Vimvq1987
    I need to study about load-balancers, such as Network Load Balancing, Linux Virtual Server, HAProxy,...There're somethings under-the-hood I need to know: What algorithms/technologies are used in these load-balancers? Which is the most popular? most effective? I expect that these algorithms/technologies will not be too complicated. Are there some resources written about them? Thank you very much for your help.

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  • how to stop objcopy from padding sections

    - by Jah
    I'm using objcopy on bash (ubuntu linux) and im trying to copy 2 sections from an ELF file using the folowing commend: objcopy -j .section1 -j .section2 The problem is the objcopy is adding some padding between the sections. Is there a way (a flag?) that can stop objcopy from padding the sections? the sections are placed one after the other in the file so there is no need for any kind of padding....

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  • Shell script to import mysql dump file.

    - by Chandu
    Hi all, I'm new to mysql. My requirement is to import a sql dump into mysql using shell script for linux and this script should be called by java program for the restoration to take place automatically. Please advice me on this. Regards, Chandu.

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  • email host marked as spam mule by site with a rooster

    - by niveknivek
    Recently I was configuring sendmail on a new linux server install and there was a configuration problem. I was given a link to a website that had the image of a rooster on it and told to consult them for configuration problems. I cant remember the url of the site, but it's apparently a well-known one. Can someone here remind me of what the site is and how I am sposed to use it to figure out the correct configuration?

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  • Run VirtualBox in background, without a window

    - by Bashman
    Hi! I was wandering if it's possible to run an Ubuntu virtual machine using VirtualBox in background, I mean, without any window open. The idea is to conect via SSH to the linux host, that would be running in background. Have you ever done somenthing like this? Is it possible? Thanks!

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  • how do you monitor your lamp server?

    - by ajsie
    i wonder how one can monitor a lamp server (ubuntu) on production. are there any standard tools for this to watch the server performance/load in realtime via the browser? how mysql, linux, apache etc are doing... what is best practice regarding this? any tutorials would be great. thanks!

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  • Where to find __sync_add_and_fetch_8?

    - by Viet
    I got errors when trying to use __sync_add_and_fetch: test8.cpp:(.text+0x90e): undefined reference to `__sync_add_and_fetch_8' collect2: ld returned 1 exit status Please kindly advise how to rectify this. Specs: GCC/G++: 4.4.1 GNU/Linux 2.6.32 SMP i686 Many thanks!

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  • Qt as a true multi-platform dev-env

    - by ruralcoder
    Inspired by the maturity problems I am facing porting on Mono Mac & Linux. I am investigating the use of Qt as an alternative. I am curious to hear about your favorite Qt experiences, tips or lesser known but useful features you know of. Please, include only one experience per answer.

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  • wx.NotificationMessage AttributeError: 'module' object has no attribute 'NotificationMessage'

    - by HughGrigg
    I get this error when trying to use wxPython's NotificationMessage class: wx.NotificationMessage("", "Hello world!").Show() AttributeError: 'module' object has no attribute 'NotificationMessage' The code is quite simply: #!/usr/bin/python import wx app = wx.App() wx.NotificationMessage("", "Hello world!").Show() app.MainLoop() What am I missing? This is running on Linux Mint 13, MATE 1.2 desktop environment, Python 2.7.3.

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  • I don't get coredump with all process

    - by Antoine
    Hello, I try to get a coredump, so i use : ulimit -c unlimited I run my program in background, and I kill it : kill -SEGV %1 But i just get : [1]+ Exit 1 ./Test And no coredumps are created. I did the same with other programs and it works, so why that didn't work with all ? Anybody can help me ? Thanks. (GNU/Linux, Debian 2.6.26)

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  • Monitor memory usage of child process

    - by Omry
    I have a Linux daemon that forks a few children and monitors them for crashes (restarting as needed). It will be great if the parent could monitor the memory usage of child processes - to detect memory leaks and restart child processes when the go beyond a certain size. How can I do this?

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  • Extracting data from jpeg files

    - by Ronny
    Hi, I want to extract some kind of bmp/rgb data from jpeg files. I had a look at libjpeg, but there seemed not to be any good documentation available. So my questions are: Where is documentation on libjpeg? Can you suggest other c-based jpeg-decompression libraries? thanks in regard ps: I am using GNU/Linux, and c/c++

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  • Manually closing a port from commandline

    - by codingfreak
    Hi I want to close an open port which is in listening mode between my client and server application. Is there any manual command line option in Linux to close a port ?? NOTE: I came to know that "only the application which owns the connected socket should close it, which will happen when the application terminates." I dont understand why it is only possible by the application which opens it ... But still eager to know if there is any another way to do it ??

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  • How can I search PDF?

    - by DILi
    Hi, Im doing a small project in C++ in LINUX PLATFORM.i need to search 10 or more PDF files and find required data.how can i do so?. i will make my question more clear with following eg suppose i have ten text books all about c++ and i need info about the topic array and how i can search the pdf and find data? thanks in advance

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  • ADO.NET Data Services for MySQL

    - by Shalan
    Hey! I've searched high and low for this, and no luck. Is there a way that CRUD methods for a MySQL install (Linux box) be exposed via ADO.NET WCF Data Services? I would really love to leverage this in my WPF app :) Thank u!

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  • mounting ext4 fs with block size of 65536

    - by seaquest
    I am doing some benchmarking on EXT4 performance on Compact Flash media. I have created an ext4 fs with block size of 65536. however I can not mount it on ubuntu-10.10-netbook-i386. (it is already mounting ext4 fs with 4096 bytes of block sizes) According to my readings on ext4 it should allow such big block sized fs. I want to hear your comments. root@ubuntu:~# mkfs.ext4 -b 65536 /dev/sda3 Warning: blocksize 65536 not usable on most systems. mke2fs 1.41.12 (17-May-2010) mkfs.ext4: 65536-byte blocks too big for system (max 4096) Proceed anyway? (y,n) y Warning: 65536-byte blocks too big for system (max 4096), forced to continue Filesystem label= OS type: Linux Block size=65536 (log=6) Fragment size=65536 (log=6) Stride=0 blocks, Stripe width=0 blocks 19968 inodes, 19830 blocks 991 blocks (5.00%) reserved for the super user First data block=0 1 block group 65528 blocks per group, 65528 fragments per group 19968 inodes per group Writing inode tables: done Creating journal (1024 blocks): done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 37 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override. root@ubuntu:~# tune2fs -l /dev/sda3 tune2fs 1.41.12 (17-May-2010) Filesystem volume name: <none> Last mounted on: <not available> Filesystem UUID: 4cf3f507-e7b4-463c-be11-5b408097099b Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize Filesystem flags: signed_directory_hash Default mount options: (none) Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 19968 Block count: 19830 Reserved block count: 991 Free blocks: 18720 Free inodes: 19957 First block: 0 Block size: 65536 Fragment size: 65536 Blocks per group: 65528 Fragments per group: 65528 Inodes per group: 19968 Inode blocks per group: 78 Flex block group size: 16 Filesystem created: Sat Feb 5 14:39:55 2011 Last mount time: n/a Last write time: Sat Feb 5 14:40:02 2011 Mount count: 0 Maximum mount count: 37 Last checked: Sat Feb 5 14:39:55 2011 Check interval: 15552000 (6 months) Next check after: Thu Aug 4 14:39:55 2011 Lifetime writes: 70 MB Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 256 Required extra isize: 28 Desired extra isize: 28 Journal inode: 8 Default directory hash: half_md4 Directory Hash Seed: afb5b570-9d47-4786-bad2-4aacb3b73516 Journal backup: inode blocks root@ubuntu:~# mount -t ext4 /dev/sda3 /mnt/ mount: wrong fs type, bad option, bad superblock on /dev/sda3, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so

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