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• Can KVM roll back changes to Virtual Disks automatically?

  - by Cygon

  I'm currently using VirtualBox on my Linux server to run a small Windows guest OS. I've configured its main virtual hard drive as what VBox calls "Immutable" - meaning that any changes to it are written into a differencing image that is discarded when the system reboots. Can KVM do something similar? I've read about snapshots via "savevm", "loadvm" but I believe that's saved states, not differencing images. What I ultimately want is a VM with two drives: one reverts on each reboot, one keeps its changes. Ideally, the unchangeable drive image should be stored with only read access granted to the user running KVM.

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• How can I fix an inconsistent NTFS file system without Windows?

  - by Demetri

  I have a Dell laptop that came with Windows from the factory. Since then, I have installed Linux and replaced the hard drive with an SSD. The NTFS partition is inconsistent (a result of bad sectors on the HDD) and needs to be fixed, but I cannot boot into Windows to run chkdsk. How do I fix this problem? Until I do, I cannot move my NTFS partition to expand space on my root filesystem, which is critically low. EDIT: All of my partitions were cloned from my dying HDD to my SSD via Clonezilla. There are no bad sectors on the SSD, but the NTFS partition is still in an inconsistent state.

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• VMware Server guest systems are extremely slow with IO load on host (Ubuntu 8.04)

  - by Dennis G.

  We are experiencing performance issues with a VMware Server 2.x installation on an Ubuntu 8.04 host. When the host system is generating IO load (for example, copying large files as part of a backup operation), the guests (also Ubuntu 8.04) become extremely unresponsive and slow (simple Apache HTTP requests taking 5 seconds instead of the usual 200ms). We tried optimizing various aspects of the VMs, but the issue remains. Is there a known bug with VMware performance under linux if host IO load is high? Is there a way to fix this? Is this only an issue with Ubuntu systems, or have you seen it on other systems before? Thanks!

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• how to remotely open an URL in Firefox in a specific profile?

  - by miernik

  I have several instances of Firefox with several different profiles running. Among them profiles with the names "software" and "test". I am trying to open an URL from a bash script to have it open in profile "test", like this: firefox -P "test" http://www.example.org/ However that opens it in profile "software" anyway. Any ideas? Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.8) Gecko/20100308 Iceweasel/3.5.8 (like Firefox/3.5.8) No, it is not a permissions problem, all my profile directories are perfectly under my permissions: root@przehyba:~/.mozilla# ls -ld firefox/ drwx------ 13 miernik miernik 4096 Mar 11 09:15 firefox/ root@przehyba:~/.mozilla# ls -ld firefox/* drwxr-xr-x 9 miernik miernik 4096 Mar 12 11:29 firefox/info -rw-r--r-- 1 miernik miernik 560 Mar 11 09:15 firefox/profiles.ini drwxr-xr-x 10 miernik miernik 4096 Mar 16 11:51 firefox/software drwxr-xr-x 9 miernik miernik 4096 Mar 11 09:14 firefox/tech drwxr-xr-x 11 miernik miernik 4096 Mar 15 22:48 firefox/test root@przehyba:~/.mozilla#

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• Opening firewall to incoming port 443

  - by jrdioko

  I recently set up the ufw firewall on a Linux machine so that outgoing connections are allowed, incoming connections are denied, and denied connections are logged. This seems to work fine for most cases, but I see many denied connections that are incoming on port 443 (many with IPs associated with Facebook). I can open that port to incoming connections, but first wanted to ask what these could be. Shouldn't HTTPS requests be initiated by me and be treated as outbound, not inbound connections? Is it typical to open incoming port 443 on consumer firewalls?

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• Squid proxy server not forwarding traffic

  - by DilbertDave

  I'm trying to set up a web filtering system (dans guardian) on my home network but am failing at the first hurdle - configuring the Squid Proxy server. No matter what I do I cannot seem to configure it properly and I just receive the 'Requested URL could not be received' error page. If I remove the proxy setting on the browser everything works normally. Ultimately I want to run this on something like a Raspberry Pi but at the moment I'm testing with a virtual machine (although efforts with a netbook were equally unsuccessful). The VM has a clean installation of Linux Mint 15 and I've installed squid via apt-get. I've followed numerous walkthroughs but this on (https://help.ubuntu.com/lts/serverguide/squid.html) pretty much sums up the process I've been taking. I'm obviously missing something but cannot figure it out - any assistance appreciated.

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• Giving a permission to write and read from /var/www

  - by mako

  I need that directory, as I want to put my sites there, so that apache can run them.. It is my virtual directory path.. and I am new to linux.. I just want to read and write from that directory.. How do I enable creating/saving/reading files/folders from that directory? What command do I give? I tried a few, but I think I need to be a super user to make the folder writtable readable. Note that I dont care about security.

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• LVM mirroring VS RAID1

  - by syrenity

  Hi. Having learned a bit about LVM mirroring, I thought about replacing the current RAID-1 scheme I'm using to gain some flexibility. Problem is that according to what I found on the Internet, LVM is: 1) Slower then RAID-1, at least in reading (as only single volume being used for reading). 2) Non-reliable on power interrupts, and requires disk cache disabling for prevention of data loss. http://www.joshbryan.com/blog/2008/01/02/lvm2-mirrors-vs-md-raid-1/ Also it seems, at least to several setup guides I read (http://www.tcpdump.com/kb/os/linux/lvm-mirroring/intro.html), that one actually requires a 3rd disk for storing the LVM log. This makes the setup completely unusable on 2 disks installations, and lowers the amount of used mirror disks on higher amount of disks. Can anyone comment the above facts, and let me know his experience of using LVM mirroring? Thanks.

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• Host hijacks USB printer from VirtualBox machine

  - by jackhab

  I have Ubuntu 9.1 running Windows XP in VirtualBox. Windows XP is a print server (there is no Linux driver for our printer). The printer is connected via USB and its USB filter is added to virtual machine settings. The problem is that every several hours Ubuntu tries to access the printer (trying to install it) and disconnects it from the virtual machine. The printer remains disconnected until I connect it again manually. I thought it is a problem with Windows power management but disabling sleep/standby in Windows didn't help. Please, advise.

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• How to get the summarized sizes of folders and their subfolders?

  - by Kau-Boy

  Let's say I want to get the size of each folder of a linux file system. When I use ls -la I don't really get the summarized size of the folders. If I use df I get the size of each mounted file system but that also doesn't help me. And with du I get the size of each subfolder and the summary of the whole file system. But I want to have only the summarized size of each folder within the ROOT folder of the file system. Is there any command to achiev that?

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• Trying to turn an old computer into a server. Where do I start?

  - by Stanton.Sculpture

  My old computer is a mac powerbook g4 that I am considering turning into an Ubuntu Server for my house of eight to share movies and music and whatever. I've never even thought about doing this kind of stuff before so I don't even know where to start. Can someone point me in the right direction? My Concerns: Most of my house mates have macs. Will there be compatibility issues? Can I make it a wireless network? My old powerbook g4 might not have the balls. Money Thanks!

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• Restrict VPN Clients to VPN Server

  - by Sprotty

  I've setup a VPN server using Debians pptpd. This all works, but I want to restrict incoming connections so they can only access ports on the VPN server and not get access to other machines on the VPN servers local network. I'm guessing this is a firewall rule? but i'm new to linux so am struggling a bit... ---- Additional info ----- The VPN Server is also hosting an SVN server, which is its real purpose, and the only service I want it to expose to incoming connections. I guess I could expose the SVN server directly, but I'm not confident that I could secure this correctly, so a VPN seemed to give an additional layer of security.

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• How to call a program and exit from the shell (the caller) when program is active?

  - by Jack

  I want to run a program with GUI, by typing into konsole: foo args … and exit from the shell (that's the caller) when the program (foo) is active. How do I this? Is there a Linux/Unix built-in command/program to do it? I'm not a shell-man, really. I know that it's possible by writing a small program in C or C++ (any other programming language with small I/O interface on POSIX) programming language with the fork() and one-of exec*() function family. It may take some time; I'll do it only if there is no native solution. Sorry for my bad English; it's not my native language. Also, not sure on tags, please edit for me, if I'm wrong. If it matters, I'm using OpenSUSE 10.x.

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• information about /proc/pid/sched

  - by redeye

  Not sure this is the right place for this question, but here goes: I'm trying to make some sense of the /proc/pid/sched and /proc/pid/task/tid/sched files for a highly threaded server process, however I was not able to find a good explanation of how to interpret this file ( just a few bits here: http://knol.google.com/k/linux-performance-tuning-and-measurement# ) . I assume this entry in procfs is related to newer versions of the kernel that run with the CFS scheduler? CentOS distro running on a 2.6.24.7-149.el5rt kernel version with preempt rt patch. Any thoughts?

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• When HDD becomes full, how to create a symbolic link to the data store on another disk?

  - by Brij Raj Singh

  I have a Linux Ubuntu machine which has an X GB hard disk. There is folder, say, /opt/software/data. The disk /dev/sda1 is almost full and I have attached another disk at /dev/sda2 which is mounted at /hdd2. Is it possible for me to link the folders /opt/software/data with /hdd2/software/data so, that every file get stored in the /hdd2/software/data but may be referred from the /opt/software/data? I can't do a reinstall of the software that creates this data, to change the default location of storage.

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• Tool to make screenshot-based "screencast"

  - by liori

  Hello, I'd like to make a simple animation: some screenshots with added text. Something like screencast, but simpler, no audio... and hopefully very quick to produce--this is my main requirement. Googling for "screencasts" gives me full-blown tools to record video and audio, and I don't need them. I can make screenshots manually, then add text in GIMP... but maybe there is something easier, quicker? Very preferably something that works on Linux.

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• "Cannot allocate memory" while no process seems to be using up memory

  - by omat

  I am not competent on server issues, any help is much appreciated. When try to start a python/django shell on a linux box, I am getting OSError: [Errno 12] Cannot allocate memory. free -m seems to confirm I am out of memory: total used free shared buffers cached Mem: 590 560 29 0 3 37 -/+ buffers/cache: 518 71 Swap: 0 0 0 But I cannot see what is eating up the memory with top or ps aux: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1 root 20 0 24336 908 0 S 0.0 0.2 0:00.68 init 2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd 3 root 20 0 0 0 0 S 0.0 0.0 0:04.85 ksoftirqd/0 How can I identify the leak? Thanks. BTW, I am not sure if it is relevant, but the machine I am talking about is an AWS EC2 instance with Ubuntu 12 running.

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• The cache is getting at full level so fast

  - by CompilingCyborg

  Please, the memory and the cache are getting to the full level quite quickly under my linux mint 9 - isadora system. I used Ubuntu and Debian before, and it was not causing this issue at all. At the current time i typing the following command frequently to empty the cache "echo 3 /proc/sys/vm/drop_caches". Please any way around this? or do you know what's going wrong? | I am only programming on this machine; no graphics, no games nothing. Thanks in advance for your help!

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• Meaning of Bridge-Check in iptables flowchart

  - by networkIT

  In the famous iptables flow-chart what does bridge-check exactly stands for ? I couldn't find any documentation. The only clue I found was while scanning the MikroTik RouterOS documentation ( RouterOS is build upon a Linux 2.6.16 kernel ), I found this : In-interface Bridge = Checks if the input interface is a port for a bridge or is the bridge. Manual:Packet Flow Comparing both flow-charts brings clues that iptables Bridge-check might equal MikroTik In-Interface Bridge. Is this true ? Else, what might be the meaning of iptables Bridge-Check ?

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• Visual annotator for large images

  - by pts

  I have a few hundred images of 30000 x 10000 pixels in size. Each image has lots of text (rendered as pixels) on it. I'd like to translate all text to another language. I speak both languages, and it's fine for me to translate each phrase manually. I need an image editor which can open these images quickly (faster than Inkscape, which needs about 60 seconds to open such an image), lets me zoom and rotate by 90 degrees, lets me erase (i.e. change the color of a selected rectangle to solid white), lets me add text, and lets me save the file as quickly as possible. I'd like to minimize the time I have to wait for the software to load, render and save images. Which is the best program for that on Windows? On Linux?

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• "Installing" GD for PHP

  - by gbuckingham89

  I'm new to server admin & Linux and have just got a VPS running CentOS 6. Apache, MySQL and PHP all came installed (along with cPanel and WHM), however I'm now also trying to install the GD library. I've run "yum install php-gd" and it installed ok. If I run it again I get "Package php-gd-5.3.2-6.el6_0.1.x86_64 already installed and latest version". However, when I do a phpinfo() or from the command line "php -m" there is no mention of GD. Is there anything else I need to do?

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• Server responses "bus error" to every command

  - by Temnovit

  I have a linux machine dedicated to MySQL server with a pretty high load. Today I woke up and was terrified to see, that database server is down. I could connect to it via SSH, but it was responding with bus error to each and every command. [root@r1304 home]# ls Bus error [root@r1304 home]# tail /var/log/messages Bus error [root@r1304 home]# reboot Bus error [root@r1304 home]# free -m Bus error [root@r1304 home]# chkdisk Bus error I went to Data Center and did a hard reset, which seemed to help, but after a half an hour situation reapeated and now I can't even connet via SSH anymore. Any ideas what this could be? how to diagnose such a problem and what are possible fixes? Server has 32 GB RAM, 2xSSD drives with software RAID UPDATE According to Zabbix, when MySQL died, number of processes stated to increase drammaticaly, until I did a hard reset. What could those be? Number of processes

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• Best DSL hardware for ADSL Troubleshooting

  - by Jeff Sacksteder

  I have a situation where I need to make the best of a bad DSL situation. The CPE is a black box with no access to DSL diagnostics. My plan is to get some sort of DSL hardware that exposes link-layer state and gives me knobs to tweak. I'd like to be able to mitigate bufferbloat as much as I can while I'm at it. The obvious choice would seem to be a Sangoma card in a linux system. I have no way of knowing if that will do anything for me without testing it, however. I have no other access to WAN troubleshooting equipment. Are there any other options avail to me as a consumer?

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• ARP replies contain wrong MAC address

  - by Jayen

  I've got a robot running linux with wired and wireless adapters. When I boot up, it connects to the wireless fine. When I assign an IP to the wired (either statically or with DHCP), it looks like it works. As in, ifconfig shows a proper IP and route shows proper routes. However, when I do an ARP request of the wired IP, the ARP reply contains the wireless MAC. ??? There's no bridge running on the robot, so why don't I get the wired MAC??? When the wire is disconnected, the wired IP replies to ping... Why is the robot replying over the wireless interface to IP requests on the wired???

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• Testing php mail() in localhost problem.

  - by Samir Ghobril

  Hey guys, recently I just installed msmtp in linux and I even send a mail from the terminal and it worked: echo -e "Subject: Test Mail\r\n\r\nThis is a test mail" |msmtp --debug --from=default -t [email protected] But in php, after editing the php.ini file to have this: sendmail_path = '/usr/bin/msmtp -t' and using this piece of code: <?php if ( mail ( '[email protected]', 'Test mail from localhost', 'Working Fine.' ) ){ echo 'Mail sent'; } else{ echo 'Error. Please check error log.'; } ?> I get the Mail sent message but don't receive a message in my inbox. Not even in the spam folder. Anything wrong I'm doing?

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