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• Cloning a linux system from sdx to cciss

  - by churnd

  I have an HP ML 310 server running CentOS Linux 5.5. I'm buying a RAID card (LSI 9260-8i) to set up a mirrored OS drive. Right now, the boot drive is set up with GRUB installed on the MBR of /dev/sda & has a 100MB /boot partition for /dev/sda1, then the rest is configured in LVM with a 20GB with a 20GB VG for the root partition & ~80GB VG for home. The new disk sizes will also be slightly larger as well. What is the best way to clone the boot drive to the new CCISS device?

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• Configuring linux server firewall to allow access from a certain range of IP addresses

  - by eggman20

  Hi Guys, I'm new to linux server. I'm currently trying to get an Ubuntu 10.10 server up and running for the first time and I'm using Webmin for administration. I'm stuck on the setting up the firewall. What I need to do is to ONLY allow a range of IPs (e.g 128.171.21.1 - 128.171.21.100) to access the HTTP server and Webmin. I've seen a lot of tutorials but none of them fits what I needed. Thanks in advance!

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• linux: accessing thousands of files in hash of directories

  - by 130490868091234

  I would like to know what is the most efficient way of concurrently accessing thousands of files of a similar size in a modern Linux cluster of computers. I am carrying an indexing operation in each of these files, so the 4 index files, about 5-10x smaller than the data file, are produced next to the file to index. Right now I am using a hierarchy of directories from ./00/00/00 to ./99/99/99 and I place 1 file at the end of each directory, like ./00/00/00/file000000.ext to ./00/00/00/file999999.ext. It seems to work better than having thousands of files in the same directory but I would like to know if there is a better way of laying out the files to improve access.

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• Linux: disbale USB without disabling power

  - by Ergot

  TLDR I want toggle between the following usages of a usb-port via the terminal: use like a normal usb-port only supply energy to charge Story I recently got me something like a magna doodle that can save your drawings to pdf, which can be moved to your computer via usb afterwards. Now the thing is that you can't save anything while it's plugged in. Because it's the only way to charge it, it bugs me that I can't find a software solution and laziness I want to keep it plugged in and toggle the connection to the computer only when needed. I noticed that it's charging and usable when it is plugged in and the computer is shut down or suspened. So I guess that there's a way to do it. Tech info computer: ThinkPad X201 Linux Kernel: 3.14.5-1-ARCH "Magna doodle": Boogie Board Sync

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• Linux Mint loses Window Focus

  - by Chris

  I recently installed Linux Mint 13 64bit with Cinamon Desktop and run into a weird problem. It's about losing Mouse-Focus if more than one Window are open. For Example, I open up Chromium, play around a little bit, and then, if I try to open any Programms from the Taskbar, I cannot click on it. It seems that Chromium won't free his Focus. Another Example, if I open two Windows (e.g. Chromium and a Terminal) and I work with Chromium, then click into the Terminal I get no Focus to it. Sorry, its a bit hard to explain.

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• Remap arrow keys to win+ijkl on linux

  - by Pengin

  I'd like to remap arrow keys to windows key plus ijkl. I can do this easily in Autohotkey on windows, but I'm struggling on Linux (Ubuntu lucid). I'd really like the solution to work independently of whether I'm using a window manager or not, and to involve modifying as few files as possible; I work on a lots of different machines and am always building new ones, so would like to minimise reconfig effort. I've tried to understand .Xmodmap, but couldn't make it work (was hard to find detailed docs on modifier keys). (Am also considering win+hjkl, but am probably not that hardcore)

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• How to troubleshoot latency between 2 linux hosts

  - by Jimm

  The latency between 2 linux hosts is about .23ms. They are connected by one switch. Ping & Wireshark confirm the latency number. But, i dont have any visibility into what is causing this latency. How can i know if the latency is due to NIC on host A or B or the switch or the cables? UPDATE: The .23 ms latency is bad for my existing application, which sends messages at very high frequency and i am trying to see if it can be brought down to .1ms

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• Maximum memory allocation for 32bit linux kernel

  - by LedZeppelin

  I was reading this article that talks about how maximum amount of ram dedicated for kernel usage in 32 bit windows is 2GB even when the total amount of ram is 4GB. http://www.brianmadden.com/blogs/brianmadden/archive/2004/02/19/the-4gb-windows-memory-limit-what-does-it-really-mean.aspx\ Is this the same for 32bit linux environments like 32-bit ubuntu 10.04? IE is the max kernel allocation 2GB ram even if the total main memory 4GB? If you increase the total amount of memory to 64GB of ram by recompiling the kernel with the PAE option enabled, what is the maximum amount of ram you can dedicate for kernel usage? Is it still 2GB? Or can you increase it?

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• Ubuntu/Linux version recommendation for HP dv6 3122TX?

  - by sanjayav

  I purchased a HP dv6 3122TX recently and after installing Ubuntu 10.10 64 bit I ran into multiple issues like, The wireless driver is not supported by Uubntu. (1) [The driver is RaLink RT3090 ] The ethernet stopped working sometimes for no reason [The driver is Realtek RTL8111/8168B ] "Corrupted low memory at ..." issue which is described as a kernel bug in Ubuntu support forums. (It started to take me to a terminal instead of the GUI and couldn't start x server after that) As I'm not an expert Ubuntu user I got fed up of all these issue and got back to Windows 7. But I need an Ubuntu installation up and running for my development work. What are your suggestions about a reasonable Ubuntu version that I should try? Or a different Linux variation? Should I stick to a 32-bit version? It'd be great anyone can give some advice on this issue.

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• How to make changes in linux maintence mode

  - by Jack

  I notice when Linux boots in maintenance mode the filesystem is read-only. Is there a way to change this, perhaps remounting as writable? An example of this being a problem is that I was unable to open vi because there were too many session files.... Not to mention it would be nice to actually fix problems.... What are you meant to be able to do if you can't make any changes to the filesystem? What kind of maintenance can be expected?

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• linux xorg dual different monitors mouse border

  - by Metiu

  If I hook an external monitor to my Linux laptop and configure it for dual head with the Gnome system tools, I do get them configured with the proper resolution and position (one to the left of the other) The mouse pointer, however, will apparently use the greatest of the two vertical resolutions. This way, when I move up to the top border, the mouse exits the visible screen, traveling in empty space, and this is quite annoying, because you can't go to the upper panel just by going up very fast. Is there a way of enforcing the right resolutions for the mouse, too? Thank you

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• Linux: Automatically switch to external monitor (VGA)

  - by peoro

  I've got an eeePC with a really tiny monitor, so whenever I go (home, faculty, parent's home, friend's home, ...) I attach it to any external monitor I can find. If it matters my system is like this: Archlinux Linux 2.6.36 Xorg 7.6 X server 1.9.2 Intel Corporation Mobile 945GME Express Integrated Graphics Controller (fully accelerated by intel modules) When I boot up the system, it uses the integrated monitor (LVDS1) only, and I have to manually manually switch to the external monitor (VGA1) using xrandr. Is it possible to configure my Xorg (or whatever) so that it uses the VGA1 output if present?

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• Transparently cache files from a network drive in Linux

  - by Vadim

  We have a Linux server that reads files from a network drive and processes them. In a common scenario, a user will log in and access the same files over and over again. The size of the files varies but the larger ones can be around 50+ Mb. The files seldom change. I was wondering if it's somehow possible to transparently cache the files. I don't want (or can) change the program the reads the files, nor do I control the protocol by which the files are accessed. I just want something to detect that I access a certain path, copy the file locally (if needed) and then read the file from the local drive. I've read about Bcache but can't figure out if it's what I need. Do you have any suggestions? Thanks, Vadim.

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• Ethernet port sleeping on PS3 running linux

  - by Doug

  My lab has a PS3 running Ubuntu Linux 9.04 Server Edition. After a period of a few hours with no use, the Ethernet connection (eth0) seems to go to sleep, causing the connection to be lost. Pinging or trying to SSH into the machine results in no response. The fix I've been using is to access the machine locally and restart it (trying to bring eth0 down then up doesn't seem to correct it). I've tried setting up an hourly cron job that runs on the PS3 and pings another machine just to create network activity, but this doesn't seem to solve the problem either. Update: The solution was to run the above cron job much more frequently: every 10 minutes works.

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• Account not getting completed deleted within linux

  - by lbanz

  I've got a nas box running some flavour of linux 2.6.31.8.nv+v2 with an arm processor. It has got a samba share called 'all' that has full read write access to everyone. However one Windows machine cannot access it without prompting for authentication and I found out from the logs that the windows account matches a local account on the nas box. What I then went to do is delete the local account on the nas. I can see that /home,/etc/password + /etc/shadow the account doesn't exist anymore. However the samba logs, shows that it thinks it is still there as it says account is disabled. I've tried rebooting both nas + windows box. Is there somewhere else that it stores account information? I logged on with a different account on that Windows machine and I can access the share fine. The smb logs shows that it can't find the user and then allows anonymous access.

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• Troubleshooting "connection reset" error on my linux server

  - by Chris

  I fervently hope someone here can help me with the problem I am experiencing. I am a programmer, and I have very little understanding of linux sysadmin terminology/concepts. I am attempting to troubleshoot a problem with my website. It is a Facebook app, and whenever I try to connect using Chrome, I get an error stating that the "connection was reset". I have been Googling for four days straight trying to find a solution to this problem, but no joy. A big part of the problem is that I do not understand the terminology being employed, and the output from many of the tools referenced is likewise indecipherable to me. I am running a VPS with CentOS 5, apache, PHP, and MySQL. I could spam this post with a ton of information from my iptables, apache, etc but if anyone needs information from my server, please let me know how to get it, and I will post it here. Thank you for any help you can offer!

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• configuring linux server to send traffic to local machines using local IP address

  - by gkdsp

  Two linux servers, server1 and server2, are on the same local network (they also have access to an external network). Server2 has a local IP of 192.168.0.2 and a host name of host2.mydomain.com. QUESTION 1: If an application on server1 sends traffic to server2 using a host name of host2.mydomain.com, what determines whether this traffic is routed to server2 using the local or external network? QUESTION 2: To ensure that all traffic sent from server1 to server2 always uses the local network, could I simply include in the server1 /etc/hosts file the following? 192.168.0.2 host2.mydomain.com ...the thinking being, if the servers are always on the same network there should never be a need for server2 to send traffic to server1 via the external network (that I can think of anyway). Is this done in practice, or is some other method preferred?

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• CPU and HD degradation on sourced based Linux distribution

  - by danilo2

  I was wondering for a long time if source based Linux distributions, like Gentoo or Funtoo are "destroying" your system faster than binary ones (like Fedora or Debian). I'm talking about CPU and hard drive degradation. Of course, when you're updating your system, it has to compile everything from source, so it takes longer and your CPU is used at hard conditions (it is warmer and more loaded). Such systems compile hundreds of packages weekly, so does it really matter? Does such a system degrade faster than binary based ones?

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• Using Arch Linux computer as a server for Rack Apps

  - by wxl

  What would be the best way to go about using an Arch Linux computer as a Rack (as in Ruby Rack, not an actual rack server) server? Here's what I want to be able to do: Automatically deploy on a git push to the server. (I already have this worked out, on post-receive the server checks out the app to /home/git/app from /home/git/app.git.) Run a Rack server application to serve up this app, one that can be restarted on demand. Run a MongoDB server Be able to access the app by going to my-server.local/app or something similar. (It's really only going to be used on the local network, no port forwarding or outside use) Any ideas would be greatly appreciated. I apologize if this seems too "do it for me".

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• [linux] preventing access in shared hosting

  - by jack

  Hi Linux Admins I set up a small shared hosting that contains some sites. For each site, there is a user. I mean, for abcd.com, I created abcd.com user and put htdocs for web hosting. I have no idea on how to prevent abcd.com from accessing xyzd.com's data. I have chmoded by changing 0 to others permission, which makes access defined by Apache when I view it with browser. How can I secure access? Thanks.

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• recommendations for a lightweight linux distribution for a test server

  - by Jack

  I'm planning on setting up a test server to experiment with some application servers (tomcat/jboss/...) and with some portals. Now the machine I've set aside for this is lightweight CPU/GPU wise(Atom D510, 4 gigabyte ram, 500 GiB hdd, onboard GPU). But it should suffice for most things, I'm more interested in the stability of JBoss/Tomcat for my purposes than the stability. However I'm having a bit of trouble picking an appropriate distribution size/performance/setup time wise/security wise since it seems I can't sneeze without another distribution popping up. I've been thinking about going for Fedora since I've read that that distribution has been optimized for Atom, but I'm not really familiar with it. My experience with Linux has mostly been limited to Ubuntu and some tinkering with puppylinux. I'm not afraid to get my hands dirty using the command line. I'm not planning on starting a discussion per se, mostly the pros/cons that people have encountered with some distributions

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• How to remove large number of files/folders in linux

  - by user1745713

  We are using hadoop to split a table into smaller files to feed to mahout, but in the process, we created a huge amount of _temporary logs. we have an nfs mount for the hadoop volume so we can use all the linux commands to delete folders files, but we just can't get them to be deleted, here's what I've tried so far: hadoop fs -rmr /.../_temporary : hangs for hours and does nothing on nfs mount: rmr -rf /.../_temporary :hangs for hours and does nothing find . -name '*.*' -type f -delete : same as above the folders look like this (38 of these folders inside _temporary): drwxr-xr-x 319324 user user 319322 Oct 24 12:12 _attempt_201310221525_0404_r_000000_0 the content of these are actually folders, not files. each one of those 319322 folders has exactly one file inside. not sure why the do the logging this way. Any help is appreciated.

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• Badwidth-Hogging Linux Server Causing Trouble

  - by BlairHippo

  We have a Linux server (2.6.28-11-generic #42-Ubuntu) that's misbehaving on a client site, gobbling up an entirely unacceptable percentage of the client's bandwidth, and we're trying to figure out what the heck it's doing. And the guy who had the sysadmin skillset has yet to be replaced. We're at a loss for what could be causing all that network traffic, and need to figure it out SOON. What log files should I be looking at to find this information? What analysis tools would you recommend for this task? Please note that I'm not looking for a tool that will allow me to analyze FUTURE traffic. The client is on the verge of shutting the machine off entirely; I need to figure out what it's been doing with the data I already have, if that's at all possible. My thanks in advance for helping a development monkey play sysadmin.

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• Linux IO scheduler on databases with RAID

  - by Raghu

  Hi, I have a linux database(MySQL) server(Dell 2950) with a 6-disk RAID 10. The default IO scheduler on it is CFQ. However, from what I have read and heard, there is no need for a scheduler like CFQ when reordering/scheduling is also done by underlying RAID controller; on the contrary since it does not account underlying RAID configuration into account performance may actually degrade with CFQ. The primary concern is to reduce CPU usage and improve throughput. Also, I have seen recommendations of using noop/deadline IO scheduler for databases primarily because of the nature of their R/W access.

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• Linux NetSec/IDS Bridge

  - by Blackninja543

  What I am looking to make is a linux system that acts as a bridge. It simple forwards any data sent on one device over to the next device. It does not attempt to block incoming attacks or redirect any traffic. What it does to is perform an IDS role on the network. Any suspicious activity is logged and reported. Snort would be one such piece of software however I was wondering what other solutions and ideas the rest of the community has.

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