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• mount qcow2 snapshots

  - by phhe

  I'm running some Xen-servers and started migrating to KVM. Currently my guests are either running on raw-images or LVMs. I found libvirt providing some very nice snapshot features (virsh snapshot-create, ...) so I decided to use qcow2 instead of raw/lvm. And here is my question: libvirt creates the same sort of snapshots on the qcow2 image as if I use qemu-img - is it possible to mount them ? I read something about qemu-nbd and the possibility of mounting qcow but I could not find a word about snapshots.

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• Prevalence of WMI enabled in real Windows Server networks

  - by TripleAntigen

  Hi I would like to get opinions from systems administrators, on how common it is that WMI functionality is actually enabled in corporate networks. I am writing an enterprise network application that could benefit from the features of WMI, but I noted after creating a virtual network based on Server 2008 R2, that WMI seems to be disabled by default. Do systems admins in practical corporate networks enable WMI? Or is it usually disabled for security purposes? What is it used for if it is enabled? Thanks for any advice! MORE INFO: I should have said, I really need to be able to query the workstations but I understand that by default the WMI ports on Win7 and XP firewalls (at least) are disallowed, so do you use some sort of group policy or other method to leave a hole open for WMI on the workstations? Or is just the servers that are of interest? Thanks for the responses!!

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• Is Page-Loading Time Relevant?

  - by doug

  Take this (ServerFault) page for instance. It has about 20 elements. When the last of these has loaded, the page is deemed "loaded"--but not before. This is certainly the protocol used by our testing service (which is among the small group of well-known vendors that offer that sort of service). Obviously this method is based on a clear, definite endpoint--therefore it's easy to apply w/ concomitant reliability. I think it's also the metric used by the popular Firefox plugin, 'YSlow.' For my employer's website, nearly always the last-to-load items are tracking code, tracking pixels, etc., so from the user's point of view--their perception--the page was "loaded" well before it had actually loaded based on the criterion used by our testing service (15-20% is a rough estimate). I'm sure i'm not the first person to consider this nor the first to wonder if it is causing micro-optimization while ignoring overall system-level, or user-perceived performance. So my question is, are there are other more practical (yet still reasonably precise) measures of page loading time?

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• Need advice on how to set up live video streaming to web/mobile devices

  - by jasondewitt

  I have a bunch of live udp video streams that currently are viewed by set top boxes in my network. I would like to pick this video up (I can do this with vlc now) and stream it out to other non-STB endpoints (webpage or a phone/tablet of some sort). Right now I am able to pick up the udp stream with vlc and convert it to an http stream on port 8080 of my vlc box. Then I can use the vlc client to pick up and watch that video stream. This is where I'm not sure where to go with it. I really doubt I would want everyone who is watching the video to make a connection back to my vlc server that is doing the encoding, so how do I distribute this live video to the people who want to see it?

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• Visual feedback indicating selected sender address for new compositions in Entourage?

  - by Stew

  I send emails from two addresses using a single Entourage 12.2.4 client. One of them is a personal work account and one is an administrative account. It's very easy to send email from the wrong address, and this causes fairly significant problems when it happens. Do you have any solutions that would make it more obvious which email address is currently selected as the "From:" address in the composition? Different icons or some sort of color-coding scheme seem like useful ideas, though perhaps too much to expect of the lowly Entourage... Thanks!

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• Intuitive view of what's using the hard drive so much on Windows 7?

  - by Aren Cambre

  Sometimes my hard drive usage is near 100%, and I have no idea what is causing it. Are there any utilities that can help diagnose excessive hard drive usage and have as intuitive of an interface as Task Manager's Processes tab, which I can sort by CPU usage? I am aware of using procmon, of adding columns to Task Manager's Processes tab like I/O Read Bytes and I/O Write Bytes, and using Resource Monitor's Disk tab. Too often, these don't give me useful information or clearly identify a single process that is hogging the disk.

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• Add entire 300 GB filesystem to Git Annex repository?

  - by Ryan Lester

  By default, I get an error that I have too many open files from the process. If I lift the limit manually, I get an error that I'm out of memory. For whatever reason, it seems that Git Annex in its current state is not optimised for this sort of task (adding thousands of files to a repository at once). As a possible solution, my next thought was to do something like: cd / find . -type d | git annex add --$NONRECURSIVELY find . -type f | git annex add # Need to add parent directories of each file first or adding files fails The problem with this solution is that there doesn't seem from the documentation to be a way to non-recursively add a directory in Git Annex. Is there something I'm missing or a workaround for this? If my proposed solution is a dead end, are there other ways that people have solved this problem?

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• YUM and RPM crash due to the liblua-5.1 library being missing

  - by A troubled linux newbie.

  I've been playing around with a LiveUsb install of basic Fedora with persistence. I attempted to install moonscript, which requires Lua and LuaRocks. After installing Lua and discovering there were flaws in the install which prevented LuaRocks from working, I used rpm to force Lua off so I could use yum to re-install it. The result was an error of this sort being yielded by both rpm and yum: There was a problem importing one of the Python modules required to run yum. The error leading to this problem was: liblua-5.1.so: cannot open shared object file: No such file or directory I've concluded from this that my Lua version installed a library which both yum and rpm are now connected to. Is there anyway to fix this without reformatting my drive and installing everything from scratch?

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• Deleting entire lines in a text file based on a partial string match with Windows PowerShell

  - by Charles

  So I have several large text files I need to sort through, and remove all occurrences of lines which contain a given keyword. So basically, if I have these lines: This is not a test This is a test Maybe a test Definitely not a test And I run the script with 'not', I need to entirely delete lines 1 and 4. I've been trying with: PS C:\Users\Admin> (Get-Content "D:\Logs\co2.txt") | Foreach-Object {$_ -replace "3*Program*", ""} | Set-Content "D:\Logs\co2.txt" but it only replaces the 'Program' and not the entire line.

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• Catch-all DNS record

  - by Christian Sciberras

  Intro Our users have the ability to buy a domain (eg: user1.com) and make it point to out website, (eg: example.com), by simply pointing user1.com to ns1/ns2.example.com . Issue So far everything's good, however, example.com does not like this; we need to set up WHM/cpanel to make the server accept user1.com . Problem is, we'd rather made this automatic, possibly without having to use WHM API. The question We need some sort of "catch-all" wildcard entry so that we capture all of our user's possible domains.

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• Install Windows XP/7 without a CD drive when the BIOS does not support booting from USB devices

  - by David Pearce

  I have a computer that has a dead CD drive in it and it seriously needs a new installation of Windows (XP is on it now, but Windows 7 does not sound that bad). At first I tried making a bootable USB drive, but it does not look like the BIOS supports booting directly from a USB drive. Is there some sort of boot loader that I can put onto the hard drive first and boot from the USB drive using that? If not, how else can I re-install Windows on the computer? Edit: The only bootable device the computer has it the network with PXE (although I have no idea how to do that) and it's three internal hard drives

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• SOCKS Proxy and HTTP Proxy considerations with push notifications

  - by J.Ashworth

  I'm working with push notifications in a mobile application, and I've been informed that a lot of our clients may be using SOCKS or HTTP proxies for outbound and inbound traffic. Is there anything in particular I need to program or document with regards to deploying our mobile app in this sort of environment? If you were setting up and installing the application server, what guarantees would you want from the person that had programmed it? Specifically regarding push notification services for all four major OSes (APNS, GCM, BPS and MPNS). I've got absolutely no experience with proxies or server deployment, in case you couldn't tell :)

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• mac osx software always order files alphabetically rather than by type.

  - by george

  i have noticed many mac applications sort the files alphabetically rather than by type. a good example would be coda by panic.com the files in the file menu are organized alphabetically, i requested for them to add the feature to organize files by type and they've said that its a finder thing. so i went in search to look at other applications to see if they were organizing by type i noticed dreamweaver cs4 had this same problem and now including dreamweaver cs5. there has to be something in the mac that does this and that i can modify. i played with spotlight and it now displays its files by type (thinking thats what i can do) but it didnt take affect in other applications. what library are these applications using to display a file menu for its files?

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• Can a custom DPI setting be applied to Remote Desktop sessions?

  - by sejong

  Can a custom DPI setting be applied to Remote Desktop sessions? When you try to change the DPI from a Remote Desktop session, you get a message that display settings can't be changed from a remote session. That made me think that changing DPI from a console setting would work. It did, sort of. If I connected via Remote Desktop to an existing console session with a custom DPI setting, that setting would be applied to the Remote Desktop session. However, if I logged off that session, the custom DPI would not be applied to subsequent Remote Desktop sessions even though it was maintained for subsequent console sessions. It looks like the registry value HKEY_CURRENT_USER\Control Panel\Desktop\WindowMetrics\AppliedDPI (and perhaps other values) is overwritten at logon, but I haven't been able figure out how to prevent it.

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• Permission issue when deleting folders

  - by nate

  I can't delete some folders and some actions are being denied because I do not have administrator access. But in my user account it says i am an administrator. I also just upgraded from Windows Vista 64-bit to Windows 7 64-bit, but I had this problem before upgrading, but now I am being denied more things. I also can't reorder the way files are sorted in folders. I can sort them through the default means, but I literally can't drag and drop them if I want to reorder them. I don't know if this is another problem or if it is related. Let me know if you need more information. Thanks!

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• Create Your Own Hand-written Font for Free

  - by User1

  Does anyone know of a place where you can create your own handwritten font for free? I used to use http://www.yourfonts.com/, but now they want money. Is there some sort of free, downloadable tool to do this? BTW: There are some online programs that allow the user to create a font using a mouse. (See this question). Very cool. But, I want something that can take a scan and turn it into a font file. Any ideas?

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• Understanding connection tracking in iptables

  - by Matt

  I'm after some clarification of the state/connection tracking in iptables. What is the difference between these rules? iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT Is connection tracking turned on when a packet is first matched containing -m state --state BLA , or is connection tracking always on? Can/Should connection state be used for fast matching like below? e.g. suppose this is some sort of router/firewall (no nat). # Default DROP policy iptables -P INPUT DROP iptables -P OUTPUT DROP iptables -P FORWARD DROP # Drop invalid iptables -A FORWARD -m state --state INVALID -j DROP # Accept established,related connections iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT # Allow ssh through, track connection iptables -A FORWARD -p tcp --syn --dport 22 -m state --state NEW -j ACCEPT

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• How to Access an AWS Instance with RDC when behind a Private Subnet of a VPC

  - by dalej

  We are implementing a typical Amazon VPC with Public and Private Address - with all servers running the Windows platform. The MS SQL instances will be on the private subnet with all IIS/web servers on the public subnet. We have followed the detailed instructions at Scenario 2: VPC with Public and Private Subnets and everything works properly - until the point where you want to set up a Remote Desktop Connection into the SQL server(s) on the private subnet. At this point, the instructions assume you are accessing a server on the public subnet and it is not clear what is required to RDC to a server on a private subnet. It would make sense that some sort of port redirection is necessary - perhaps accessing the EIP of the Nat instance to hit a particular SQL server? Or perhaps use an Elastic Load Balancer (even though this is really for http protocols)? But it is not obvious what additional setup is required for such a Remote Desktop Connection?

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• Bash script getting automatically deleted from Ubuntu 12.04 Server?

  - by Kris Anderson

  I'm running a bash script on an ubuntu 12.04 through cron. The script works fine for a few weeks (runs daily backups of websites, mysql databases, and copies to Amazon S3). However, twice now I've noticed that backups stopped happening. Both times the backup script (backupscript.sh) located in my home folder was no longer there. No one else has access to this server, so nothing was manually changed on the server and no one deleted the file by mistake. The cron job (nano /etc/crontab) still references this script, but the script itself disappears. What could cause this to happen? Does Ubuntu delete the script if it runs into some sort of error?

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• Inverting colors of a PDF

  - by legr3c

  I need to invert all the colors of a PDF document (background, text, graphics, and images). I want it persistent in the file so the inverted viewing options, that some viewers offer, won't help. Rasterizing the document and using image manipulation software is also not an option. I read somewhere that this can be done with the Enfocus PitStop plugin for Acrobat. However I didn't see a corresponding command anywhere. Am I missing something? Then I read that the ARTS PDF Crackerjack plugin for Acrobat offers negative printing so I tried that, too. The option is there but it simply doesn't work. I have been searching for very long for a way to do this. It seems like a common enough task but I just can't find out how to do it. Are there maybe any virtual printer drivers or something of the sort that support negative printing? Can anyone help?

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• Why some recovery tools are still able to find deleted files after I purge Recycle Bin, defrag the disk and zero-fill free space?

  - by Ivan

  As far as I understand, when I delete (without using Recycle Bin) a file, its record is removed from the file system table of contents (FAT/MFT/etc...) but the values of the disk sectors which were occupied by the file remain intact until these sectors are reused to write something else. When I use some sort of erased files recovery tool, it reads those sectors directly and tries to build up the original file. In this case, what I can't understand is why recovery tools are still able to find deleted files (with reduced chance of rebuilding them though) after I defragment the drive and overwrite all the free space with zeros. Can you explain this? I thought zero-overwritten deleted files can be only found by means of some special forensic lab magnetic scan hardware and those complex wiping algorithms (overwriting free space multiple times with random and non-random patterns) only make sense to prevent such a physical scan to succeed, but practically it seems that plain zero-fill is not enough to wipe all the tracks of deleted files. How can this be?

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• Streaming audio to headless linux box

  - by Ralph

  I have a dual boot (Win 7 + Ubuntu) PC connected via wifi with my music collection on a local HDD. I usually use Rhythmbox on Ubuntu or Winamp on Windows to listen to my music but I'll change if I have to. I also have a Raspberry Pi (low power PC running Debian) in the living room that is usually headless and connected via ethernet. The Raspberry Pi is also connected to my living room speakers via an amp. I would like to be able to stream music from my PC over the network to the linux raspberry pi. What software can I use to do this? Some sort of audio client\server?

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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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• Google Bookmarks thinks I'm in Portugal

  - by Aeo

  I was looking for a convenient way to keep links to web sites between multiple computers on Monday. After a bit of searching, I found out Google offers a service that covers my desires just fine, Google Bookmarks. Fast forward to today, Wednesday afternoon, I loaded up Google Bookmarks to find this: Sorry, I don't speak Portuguese. I cacheless-refreshed my gmail tab to make sure something wasn't up with my whole account, and it's fine. Hitting the translate button works... ...sort of. It works enough to at least know what's going on. I can work with this, but... It really seems backwards. How do I tell Google I don't understand Portuguese in my Bookmarks?

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• How do I route traffic to website using a spcified network connection on Windows 7

  - by rwetzeler

  I want to route all traffic to a website over my wireless connection while the rest of the traffic using my lan. What I tried was first finding out the IP address of the website I want to go to. For example, lets say pandora.com. I found it resolves to 208.85.40.20. I have entered that entry into my hosts file. I then added that route using route add 208.85.40.20 mask 255.255.255.255 WirelessIP. It doesn't seem to work however. Instead of using the IP address, is there a way that I can just say.. this URL to route over that connection? Does anyone know of a program that I can install that will do this.. possibly some sort of proxy or a software load balancer that can do this?

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