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• Is it possible to change the Raid5 chunk size of an existing device?

  - by AlexCombas

  I have an existing raid5 device which I created using mdadm on Linux. When I created the device I set the chunk size to 64 but I would like to test the performance of various sizes but I don't want to have to rebuild my entire system to do so. If it is not possible to do it live then is it possible to do this by booting with a rescue disk? Any advice on the steps how to do this, either live or with a rescue disk, will be greatly appreciated.

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• How to set multiple subdomains in the host file (DNS)?

  - by Milos

  I have a lot of subdomains in the main domain xxx.zzz So, for this domain, I can have aaa.xxx.zzz bbb.xxx.zzz ccc.xxx.zzz ddd.xxx.zzz eee.xxx.zzz ....ETC.... Istead of adding each subdomain in the host file, I would like to add only the main domain xxx.zzz and then to be able to access all the subdomains. I have tryed with *.xxx.zzz but apparently, this will not work (Linux or Windows). Any idea is welcome. Thank you very much.

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• Deny Home-Directory-Access for root

  - by theomega

  Hy, a friend and me want to share a Linux-Machine. We both need to get root-rights via sudo for administering that machine. Is it somehow possible to deny the access to the home-folder for the other one, although he can become root? Thanks!

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• Capture virtual machine traffic in Fiddler

  - by HtS

  I'm running Ubuntu in a virtual machine (host machine is Windows 7). Is it possible to use Fiddler in the host machine to capture the traffic from the virtual machine? Seeing as the virtual machine's network must be passing through the host computers NIC, can Fiddler capture the packets? (I don't know of any free alternative to Fiddler for Linux, except Tamper Data, but I need a bit more control). Thanks.

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• Is there an alternative to /dev/urandom?

  - by altCognito

  Is there some faster way than /dev/[u]random? Sometimes, I need to do things like cat /dev/urandom /dev/sdb The random devices are "too" secure und unfortunately too slow for that. I know that there are wipe and similar tools for secure deletion, but I suppose there are also some on-board means to that in Linux.

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• Finding out the time a filesystem was last mounted

  - by MichaelM

  Hey I want to find out the last time a filesystem was mounted on Linux (Debian). Any help? Cheers Michael

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• Unable to view users and groups

  - by Ewr Xcerq

  I am using Centos5 running on a VMWare but whenever I choose to open the User Manager menu from System-Administration, an error message always displays The user database cannot be read. This problem is most likely caused by a mismatch between etc/passwd and /etc/shadow or /etc/group and /etc/gshadow/. The program will now exit. I am a Linux novice and have no idea how to fix this tiny issue. ANy help is thankful. Thank you.

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• Sharing a serial port between two processes

  - by peterrus

  As it is not possible to directly share a serial port between two processes using Linux, I am looking for another way to achieve this, I have heard about socat but could not find a concrete example of how to realize the following: Split one physical serial port (/dev/ttyUSB0) into two virtual ports, one for reading and one for writing, as one process only needs to send data, and one only needs to receive data. I can no modify the sending application unfortunately.

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• How do I preserve ownership permissions when copying to an external volume?

  - by Yitzchak

  When I upgrade or reinstall linux I backup my home folder by running sudo cp -pr /home/users/yitzchak /media/externalHDD/backups. When I do this I get errors saying that permissions could not be preserved and when I copy the folder back onto my local disk I see that ownership has been changed to root and I have to chown all of them back, which has to be done manually piecemeal because not all files have the same group. Is there any way around that?

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• Which twitter client can synchronize unread tweets?

  - by Tom Burger

  Right now I'm forced to read all the tweets in a single client on a single device (TweetDeck on my Android phone). If I would switch to another device and/or client, I would need to search for the last unread tweet, which is sometimes complicated (too many tweets). So, the question: Is there a client who can keep the status (read/unread) on tweets across multiple devices? My target systems would be now Android and MS Windows, but also Linux might be handy.

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• Lightweight ad-blocker for firefox

  - by student

  On a old machine (512 MB RAM) I am currently running ubuntu jaunty and firefox 3.0.15. I tried the ad blocker addon add block plus but it eats lots of RAM (300 MB). Is high memory load of this add-on a bug, which is fixed in a newer version or just normal? If so, why is the memory usage so high? Is there another ad blocker add-on for firefox or another browser- add-on combination for linux (ubuntu jaunty) which uses significant less RAM?

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• Unix bidirectional pipe on commandline

  - by John W

  I've been able to use this linux command to connect Netcat to a serial port: nc -l 80 <> /dev/ttyS0 I would like to be able to log this transaction. My backup plan is to use Wireshark to monitor the netcat stream, but ideally I'd like to do something like this: cat /dev/ttyS0 | tee upstream.bin | nc -l 80| tee downstream.bin | /dev/ttyS0 This tries to open ttyS0 twice and therefore throws a permissions error. Does anyone know a smarter way to do this?

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• Can I boot my notebook via eSata pci-xpress card?

  - by OliverS

  I would like to boot directly from an external hard disk to improve performance over my internal notebook hard disk. My notebook has no native eSata jack but a pci express card. As my BIOS doesn't support the card on boot time so no way directly booting it. My question is, is it possible to work around this issue by using an USB stick or similar with a boot loader like grub and if so, will this only work for Linux or Windows as well?

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• Check DVD region code from command line

  - by Unreason

  Is there a way to get DVD region code from command line (linux/ubuntu 9.10)? I want to script this action and store the region code (and other data about DVD) in a log.

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• Learn to use both sides of the keyboard

  - by brewerja

  I'd like to force myself to use the correct (right side or left side) Shift, Ctrl, and Alt keys depending on what letter I'm typing. For instance I'd like to use the right Shift key when typing 'A' and the left Shift key when typing 'P'. I find myself using only the left side a lot and I'm looking for a way to set the mappings on my machine so that it only responds to correct pairings. I'm running Fedora, but any Linux distro support would be an acceptable answer.

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• Forward my http requests blindly through to a new server

  - by Jason

  I need to forward any http request from my old server IP to my new IP. I migrated servers and there are a few domains that have a high TTL and I could not update. Is it possible to take all HTTP requests from one server running centos/whm/php/apache 2+ and forward them to the new ip? Since I have hundreds of domains I'd prefer a solution that involves running an app on the linux box that will push requests automatically to the new box. Thoughts? Cheers

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• local host gives error 403 on Ubuntu

  - by Dan

  Hello I am new to ubuntu linux and am currently trying to configure my netbeans to work with PHP. I have found several tutorials to install all the applications I need and have installed a virtual directory for netbeans to run in. Unfortunately, whenever netbeans or I myself go to my local host I get an error 403. I tried modifying my settings to allow from localhost (instead of allow from all) but this did not work and am completely out of ideas.

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• Traffic going to wrong server

  - by markxi

  I'm in the process of migrating to a new server, but some traffic that should be going to old server is now coming to the new server before I am ready to migrate. My provider used an IP used as the secondary nameserver on the old server as the primary IP on the new server, so now my secondary nameserver is directing traffic to the new server. Is there a way to forward the traffic hitting the new IP back to the old IP while I wait for DNS to propagate? Server is Linux CENTOS 6.5 x86_64 w/ cPanel Thanks

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• ntp.conf sync to local machines

  - by anonym

  I have 2 linux machines, they do not have internet connectivity or any other means of getting an external clock. I need one of them to act as the "master"/server and the other machine to sync it's clock to that server. It's not important that the time is correct, it's only important that the time is the same on these 2 machines. So, give I have a server (192.168.1.10) and a client (192.168.1.11), how do I set up /etc/ntp.conf on these 2 machines respectivly ?

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• Is there any known harm in logging in as root?

  - by tommieb75

  I am pondering on what would be any implications in logging in via SSH as root? Surely SSH is safe or am I kidding myself and falling for the unwary ethic of logging into a remote Linux box as root? Thanks.

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• Java Applet Console

  - by Jivings

  Can anyone tell me how to access the Java Applet Console in Chromium for Linux? I assumed there would be a Java application packaged with the JRE that would give me access through the command line, but I can't find reference to anything. $ java -version java version "1.6.0_24" OpenJDK Runtime Environment (IcedTea6 1.11.2) (ArchLinux-6.b24_1.11.2-1-i686) OpenJDK Client VM (build 20.0-b12, mixed mode)

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• What is the CPU microcode?

  - by golem

  Today after unpacking the initramfs file from my Linux /boot directory I found that it contains the GenuineIntel.bin file, and that that file is an image of what is called the CPU microcode. Then I found articles on ArchWiki and Wikipedia describing the subject. Now I'm not sure that my vague understanding of the subject is correct. Can anyone please explain what the CPU microcode is in plain English?

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• use theme for X11

  - by amir-beygi

  HI all sorry for my bad english My program (GTK) runs in linux(ubuntu) without any problem and it's themes are fine but when i change my system to run just X and then my program , it runs but without any theme ,how can i configure my system to use theme in X for my program REGARDS

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• File shares for Mac users

  - by Generic Error

  The main file shares on our network are currently hosted by old Apple XServes. I had planned to replace some of these with Windows shares as I have better hardware available but have been told this is likely to cause issues with some of our Mac users. What sort of issues am I likely to run into and what are the recommended ways of hosting general file storage in a mixed OS (Windows, OSX, occasionally linux) environment?

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• Any dangers of sharing /home partition between two distros?

  - by Linux_iOS.rb.cpp.c.lisp.m.sh

  I have a laptop with a 250GB HDD. I have an existing installation of Kubuntu across three partitions (A 20GB one for /, 2GB for swap, and something like 97GB for /home). If I add another partition, use that as / for a Mint 13 install, and then use the existing /home partition as Linux Mint's home folder (different user names), are there any dangers (besides badly done partitioning, and other dumb things like that)?

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