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• How to setup a simple self-hosted dynamic DNS server

  - by Cerin

  I have a small internal network of physical machines running hypervisors, which in turn run several KVM Ubuntu virtual machines. How would I setup an internal dynamic DNS server so that when I run a script to create a new virtual machine, that VM could automatically register itself in the DNS server? Bind seems to be the standard DNS server for Linux, but it seems designed for a much more "static" DNS model. Dynamically updating this would require a complicated script that would have to SSH into the DNS server, edit configuration files, and then restart the server. This doesn't seem like a very elegant solution. Are there better options? I saw a similar question, although they're asking for a solution for a public setting on Amazon. My servers are entirely private, and I don't want to rely on an external VM host or Dynamic DNS provider.

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• How can I tell if ZFS (zfs-fuse) dedup/compression is applied to a particular file?

  - by asari

  I have a zfs formatted partition using zfs-fuse for linux (Ubuntu). I had used it for a while, and then enabled dedup and compression on it (zfs set compression=on/dedup=on). Now I think I have some files that are dedup'ed and compressed, and file that are not yet. It was OK, but sometimes I was confused. Let's see, following command would consume almost 4GB of my zfs storage: cp oldfile.4GB newfile.4GB .. and this would consume almost zero: cp newfile.4GB newfile.4GB.2 This is because the old file is not yet compressed, so dedup not happened, I think. My idea is -- if I can find old files that are not yet dedup/compressed, I can perform batch copy/rename/remove them to eliminate duplicity and redundancy. But how I can check that? I know I can re-copy whole contents of my storage should work (even better with checking the time stamp of each file), but I'd be happier if I have zfsstat-like tool that shows some file properties.

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• How can i resolve all external addresses to internal address?

  - by Darian

  I am currently setting up a Linux server for a WIFI access-point. When ever someone who is connected to the hotspot/access-point? tries to reload a page they get forced onto the one page. Note: this wont have internet access! ie: user tries accessing www.google.com = it returns 192.168.1.200 or example.domain I've read that "dnsmasq" can be used to redirect any external addresses to an internal address. but haven't had any luck. Anyone have an example of a config for "dnsmasq"? I have also read that this can be done through a proxy?

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• When your field-terminating char appears within field values

  - by Jonathan Sampson

  I've had a very colorful morning learning the innerparts of Linux's sort command, and have come across yet another issue that I can't seem to find an answer for in the documentation. I'm currently using -t, to indicate that my fields are split by the comma character, but I'm finding that in some of my files, the comma is used (between double-quotes) within values: Jonathan Sampson,,[email protected],0987654321 "Foobar CEO,","CEO,",[email protected],, How can I use a comma to terminate my fields, but ignore the occurences of it within values? Is this fairly simple, or do I need to re-export all of my data using a more-foreign field-terminator?

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• Apache 2.2.16 + PHP 5.2.14 sometimes causes Apache to not stop properly

  - by ZiggyTheHamster

  Sometimes, Apache decides not to shut down nicely. killall apache2 or kill -9 (apache2 PID here) shuts it down so that it can actually start back up without the port being in use. Other posts seem to indicate that PHP 5.2 might have issues hanging up Apache. I'm using the worker MPM on an x86_64 Gentoo Linux system if that helps. Any other things I should consider hanging up Apache besides PHP? Should I be stopping Apache with /etc/init.d/apache2 gracefulstop instead of /etc/init.d/apache2 stop?

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• USB 3.0 not functioning fully

  - by Simon Sheehan

  After installing GNU/Linux today onto my Lenovo Y570 laptop, I ran into an issue quickly - the USB 3.0 support. 2/3 of my USB ports are 3.0 so I kind of need them. The ports are powered at the very least - my phone is charging from one, however, plugging in external drives, USB drives, or even a mouse gives no response. The drives spin up, etc, but they do nothing more than that. So there is power, but no information flowing to them. What am I missing here? What can I try to enable to make things work?

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• Can I send some text to the STDIN of an active process running in a screen session?

  - by Richard Gaywood

  I have a long-running server process inside a screen session on my Linux server. It's a bit unstable (and sadly not my software so I can't fix that!), so I want to script a nightly restart of the process to help stability. The only way to make it do a graceful shutdown is to go to the screen process, switch to the window it's running in, and enter the string "stop" on its control console. Are there any smart redirection contortions I can do to make a cronjob send that stop command at a fixed time every day?

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• How can I send a Wake on Wireless LAN (WoWLAN) / Wake on Demand request manually?

  - by pioto

  This is similar to, but not the same as, http://serverfault.com/questions/1721/is-wireless-wake-on-lan-possible. I know it is supposed to be possible. The question is, how do I do whatever the AirPort Basestation will do? All I can find so far is that supposedly I need to send something with Wireless Multimedia Extensions (WMM): Basically, I want to be able to wake up my Mac Mini remotely, probably using my Linux laptop. Does anyone know of a tool to do this? Basic Wake on LAN tools do not seem to be the right thing. I don't need the Sleep Proxy Service bit, because I already know the MAC address of the system I want to wake up.

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• Calculate data transferred in a local LAN

  - by ramdaz

  How do you calculate the data flown between a computer and the gateway computer. I have a Linux router/gateway running IP Tables which routes internet traffic in a LAN. I have individual users with IP/MAC Address mapped who access Interet through the gateway computer. I would like to find out the traffic utilized by individual users. Is it possible for us to find out what kind of traffic was HTTP, SMTP, FTP etc. Is it also possible to pool the information on hourly basis, and get specific info so that I can store information in a database? I have heard of IP Accounting? Is that the right way

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• Apache - setting up a subdomain

  - by Adam

  I'm having trouble getting a subdomain working for an Apache Linux Install. Following is what I've configured: DNS: connect.goneglobal.com. CNAME 54.251.35.112 Apache httpd.conf: <VirtualHost *:80> DocumentRoot /var/www/html/connect.goneglobal.com ServerName connect.goneglobal.com </VirtualHost> restart httpd - this ip is registered to this server - works for other sites on this apache. (first time I've tried a subdomain). Appears the issue is with DNS potentially and it doesn't seem to get to the site. Note: I have an index.php in the Documentroot. Note: there is an A record for goneglobal.com. which goes to a different hosting provider. thx

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• Running make for Nginx throws a “multiple target patterns” error

  - by Justin Meltzer

  When I run make inside my installed nginx directory I get the output: make -f objs/Makefile make[1]: Entering directory `/home/ec2-user/nginx/nginx-1.2.4' objs/Makefile:110: *** multiple target patterns. Stop. make[1]: Leaving directory `/home/ec2-user/nginx/nginx-1.2.4' make: * [build] Error 2 I am on an Amazon Linux AMI. The steps I took from the beginning was wget /path/to/nginx/tarball tar xvf nginx-1.2.4.tar.gz cd nginx-1.2.4 ./configure --prefix=/nginx --a-bunch-of-other-options Then I ran make. Also I installed make by running sudo yum install make Please let me know if there's any other information I should be providing.

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• Which FLOSS text editor is most like kwrite without being KDE-based?

  - by darenw

  Among text editors on Linux, I usually prefer KWrite. I like that I can quickly turn on/off line numbers and line wrap in the View menu. Other settings are easy to change. Other text editors I've used in the past, such as Gnome's gedit, bury line numbering and wrapping checkboxes deeper into the menu system, making it more distracting to change while concentrating on real work. However, KWrite is a KDE app. On Ubuntu it drags in over a dozen other packages, which I suspect I don't really need. Why would a text editor need all that? It's slower to start up than some other editors I've tried. I'm also trying to run an all-gnome system w/o any KDE, just to see how far I get with it. So, what GUI text editor isn't KDE-based, has few dependencies and quick start-up, easy to change line wrap and numbering, and general similarity to KWrite? What comes closest?

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• X-Window Modeline for high resolution modes on NEC LCD 22WV monitor

  - by Jakub Narebski

  What should look like X Window System (X.Org) modeline to be put in xorg.conf, for high resolution (incuding recommended 1680x1050 @ 50Hz resolution) for 22" NEC LCD 22WV monitor? X.Org autodetect correctly only 800x600 and lower resolution SVGA modes, unfortunately. How can I generate proper "Modeline" line for xorg.conf? Is information included in NEC_Datasheet_LCD22WV-english.pdf enough (found on NEC LCD 22WV product info page)? What tools there are available to generate proper modeline for a LCD monitor for Linux? MS Windows (MS Windows XP Home) correctly detects and use 1680x1050 resolution; can I somehow get modeline information from MS Windows?

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• Policy Routing with Openvpn?

  - by sadawd

  Dear Everyone I am currently using openvpn for normal browsing. However, I have the following services running: a bit torrent client, a web server, IRC and a git server which I would really want it to not be using my vpn connection (and use my original connection instead). Is there a way to do this? I looked up policy routing and I can't really find any tutorial on how to do this on linux (I am on ubuntu). I don't want the solution to be incredibly complicated - I am pretty new to networking in ubuntu and I only want a very simple solution to this problem. Can someone help me out?

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• What can I do to give some more love and disk space to my database on Ubuntu?

  - by Yaron Naveh

  I'm new to linux. I've deployed a db to ubuntu server on amazon and found out I'm low on disk space. did df (see below) - and found out that I'm 89% capacity on one file system, but less on others. What does this mean? Do I have a few partitions and can now utilize others besides /dev/xvda1? Also /dev/xvdb seems large, is it safe to put the db in it and only use it? If so do I need to mount it or do something special? $> df -lah Filesystem Size Used Avail Use% Mounted on /dev/xvda1 8.0G 6.7G 914M 89% / proc 0 0 0 - /proc sysfs 0 0 0 - /sys none 0 0 0 - /sys/fs/fuse/connections none 0 0 0 - /sys/kernel/debug none 0 0 0 - /sys/kernel/security udev 3.7G 8.0K 3.7G 1% /dev devpts 0 0 0 - /dev/pts tmpfs 1.5G 164K 1.5G 1% /run none 5.0M 0 5.0M 0% /run/lock none 3.7G 0 3.7G 0% /run/shm /dev/xvdb 414G 199M 393G 1% /mnt

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• Unable to mount portable hard drive on Ubuntu

  - by VoY

  My portable hard drive (WD My Passport), which used to work correctly now does not automount on my Ubuntu system. It does work on a Windows machine or even when plugged into WD HD TV, which is a Linux based device. There's one NTFS partition spanning the whole drive. When I plug the disk in, I see the following in dmesg: [269259.504631] usb 1-2.2: new high speed USB device using ehci_hcd and address 20 [269259.604674] usb 1-2.2: configuration #1 chosen from 1 choice However it does not mount in GNOME and I don't see it when I type: sudo fdisk -l Any suggestions why this might be? I repaired the partition using chkdsk on Windows, so the issue is probably not filesystem related.

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• Unable to write into character device file in Ubuntu

  - by Surjya Narayana Padhi

  I just written a linux character driver. I created one character device file named X. I can see that file in /dev folder. Now I want to do some read/write operation into this file. I opened the filed in VI editor and write some text into it. I used :wq and exited. It didn't show any error. Now when I do cat on that same file I am not able to see any content. I tried it several times. The same situation. Please let me know If I am doing something wrong....

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• How can I free up disk space in my Ubuntu Hardy Heron install?

  - by rvs

  I'd like to make some room on /dev/sda1 without necessarily having to remove a whole bunch of applications (I've already gone through and deleted all frivolous apps). This is the state of /dev/sda1 currently: Dir: / Type: ext3 Total: 9.4GiB Free: 488.6MiB Available: 0bytes Used: 8.9GiB EDIT added du output from comments below: 769068 /var/lib/mysql 351208 /usr/lib 297060 /usr/local/bin/eclipse/plugins 184124 /usr/bin 175924 /usr/lib/openoffice/program 143940 /usr/local/bin/eclipsePHP/plugins 92520 /boot 81200 /opt/android-sdk-linux/add-ons/google_apis-6_r01/images 79964 /opt That's funny, because the tables in /var/lib/mysql are the reason that I ran out in the first place. But I need them, and room for many more possibly large db's.

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• How to symlink folders and exclude certain files

  - by Jarrod White

  Hey Guys, I'm not a server guru (unfortunately) but have a decent knowledge of linux & bsd. I'm trying to symlink multiple instances of HLDS (game server) but need to exclude certain folders & config files to achieve this properly. I need to do it this way as HLDS loads many mods automatically, and putting an exception to disable the mods doesnt work for all of them. so basically i want: /home/user/hlds-install (the base install) /home/user/server1 /home/user/server2 etc... and then be able to manually put any configs/mods ive excluded into the server dir's so that each server can be configured individually. Can anyone tell me how to do this, perhaps some sort of bash script so that I can just change the targets to run it each time i want to create a new one. I have quite a number to make so doing the whole thing manually for each one definately isn't an option and im all for working smarter, not harder! Thanks :)

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• Snapshot/rollback for libvirt+KVM?

  - by jtimberman

  I've recently begun using KVM for my development/test environment on a Linux host system with 8G memory. Prior, I was using VMware Fusion for my virtual environment, but my Macbook only has 2G memory. I tried VMware Server and ESX on the host instead of KVM, but the webUI doesn't run on Mac OSX's Firefox, and we're going to be doing more with KVM anyway. The main feature of VMware I miss is robust snapshot/rollback, but I'm missing this in KVM. I understand the snapshot command, but it shuts down the guest OS when complete, and then copying the disk image to preserve its state is cumbersome. Is this really the best way to manage snapshots on KVM?

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• Cheapest server per gigabit throughput [closed]

  - by nethgirb

  I'm looking for a set of servers for performance testing a network, and secondarily testing some applications on the servers. Their most important task is simply to pump out data: from an application like memcached or just dumped from a large file in memory into a TCP flow (i.e., disk performance doesn't matter). This should happen over one or more 1 gigabit Ethernet ports, and the machines should run Linux (ideally), or perhaps Mac OS X or some other *nix. Other than that, there are few constraints (e.g., even something ARM-based could be fine). So here's the question: What's the cheapest server per gigabit? Price and power are both considerations.

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• Broadcom BCM5716 Hangs on CentOS 6 Boot

  - by someotherguy

  I have a fresh CentOS 6 installation on a Dell R310 server with a Broadcom BCM5716. The onboard NIC is causing the boot to hang for some reason. Welcome to CentOS Linux Starting udev: udev: starting version 147 Boardcom NetXtreme II Gigabit Ethernet Driver bnx2 v2.0.23b (Feb 01, 2011) bnx2 0000:02:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 That's it... then it just hangs / freezes. If I disable the NIC via the BIOS settings, CentOS boots fine. I've downloaded and installed the latest driver from Broadcom's website. Any ideas?

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• Installing FFMPEG-PHP on Qnap Nas (TS-410), PHPIZE error

  - by Dino

  I have been trying to install ffmpeg-php on my qnap nas (ts-410) without success. ? Basically I have installed the QPKG Optware, and using the plugin installed php-dev, autoconf, m4, php-gd, and perl. After that I downloaded ffmpeg-0.6.0.tbz2 (from: http://sourceforge.net/projects/ffmpeg-php/files/ffmpeg-php/0.6.0/ffmpeg-php-0.6.0.tbz2/download) to the Public folder, and extracted the file (tar -xjf ffmpeg-0.6.0.tbz2) Then go to the folder: cd ffmpeg-0.6.0 Finally I run: phpize which is where the process fails I get the following error: configure.in:3: warning: prefer named diversions Can anyone advice how to successfully install ffmpeg-php on my nas? Ps. I am new to linux so easy step guide would be appreciated, or even better if a QPKG / IPKG becomes available ? !!!! Thanks Dean

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• Restoring the owners on debian system files

  - by Vlad

  Due to my inattention, tiredness (and probably stupidity) i've run chown -R someuser:someuser / and now all your base are belongs to us the files on the server belong to one user (lol). After system restart apache, bind9, mysql, and a dozen of other applications don't start and fill their log files with permission errors. I haven't done any backups on system files, only on the db and website files... Please suggest some ways to revive my web server. I have only 2 month experience with linux, so please keep it simple...

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• Help about NAT with virtual server

  - by Thanh Tran

  I have a dedicated server running Linux CentOS 5.3 with 2 IP addresses. I've installed a virtual machine using VMware Server. The host and the guest have a host-only network. Now I want to map the 2nd IP address to the virtual machine so that it can run as a second dedicated server for me. Here is what I do: modprobe iptable_nat echo "1" > /proc/sys/net/ipv4/ip_forward iptables -t filter -A FORWARD -s 192.168.78.128 -d 64.85.164.184 -j ACCEPT iptables -t nat -A PREROUTING -d 64.85.164.184 -i eth0 -j DNAT --to-destination 192.168.78.128 iptables -t nat -A POSTROUTING -s 192.168.78.128 -o eth0 -j SNAT --to-source 64.85.164.184</p> But it not working as intended. What is the matter?

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