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• Linux Virtualization Options on EC2

  - by recampbell

  I need to subdivide EC2 (or perhaps other cloud provider) instances. I know you cannot run a full virtualization stack on another. For instance a Xen guest cannot host a VirtualBox guest. So this means I am left with operating system-level virtualization. EC2 kernels are only publishable by select vendors, so you cannot upload the custom kernels required for OpenVZ or Vserver. For Linux, I think this leaves me with lxc (on Ubuntu 9.10), User Mode Linux, or qemu. I'm having a hard time finding comparisons between them. Performance is a concern, as is the ability to provide SMP to the guests. I would also like to use COW/sparse roots to reduce guest provisioning. My question is, what are the trade-offs between these options?

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• How do I convert a Linux disk image into a sparse file?

  - by endolith

  I have a bunch of disk images, made with ddrescue, on an EXT partition, and I want to reduce their size without losing data, while still being mountable. How can I fill the empty space in the image's filesystem with zeros, and then convert the file into a sparse file so this empty space is not actually stored on disk? For example: > du -s --si --apparent-size Jimage.image 120G Jimage.image > du -s --si Jimage.image 121G Jimage.image This actually only has 50G of real data on it, though, so the second measurement should be much smaller. This supposedly will fill empty space with zeros: cat /dev/zero > zero.file rm zero.file But if sparse files are handled transparently, it might actually create a sparse file without writing anything to the virtual disk, ironically preventing me from turning the virtual disk image into a sparse file itself. :) Does it? Note: For some reason, sudo dd if=/dev/zero of=./zero.file works when cat does not on a mounted disk image.

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• Kinesis Advantage OS X media keys

  - by Patrick O'Doherty

  I recently started using a Kinesis Advantage with my MacBook and one of the things I've really missed since switching from my Apple keyboard is having the functionality of the OS X media keys. I know the Advantage keyboards are pretty customisable but having Googled for quite a while I haven't been able to find any sources saying that it's possible to map the function keys on the Advantage to the appropriate OS X function. Has anyone had any success in getting something like this to work? Any tips would be hugely appreciated.

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• Fastest router for OpenWRT/etc?

  - by marienbad

  I realize OpenWRT Wiki hardware info tells CPU model and MHz for many routers, but MHz doesn't directly map to speed. So... as far as you know, what are some of the fastest OpenWRT-compatible wifi routers out there?

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• Oracle LogMiner (Unsupported Operation)

  - by Sarith

  Hi all, I'm currently using Oracle 11g on RHEL5. I'm digging to see what are in the archived log files. After I query from v$logmnr_contents, I see many transactions of UNSUPPORTED operation. What do these unsupported transactions mean? I think that it's the cause that make my database generates lots of archived logs. Moreover, I'm using global temporary table for generating reports. I discover that when I insert and delete from those temporary table, it also records in the archived log file. How to do to reduce those recorded transactions? Regards, Sarith

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• Wired and Wireless USB Network Adapter

  - by Evan M.

  Does anyone know if there are any USB network adapters out there that have both wired and wireless networking capability? Far-fetched, I know, but thought I'd ask. Background: Some of our users have locked down laptops that we also include unlocked virtual machines running on VMware Player. Sometimes the users have a need for network connectivity with their VMs where NAT and bridged networking from the host won't work. To supplement this, we want to supply them with adapters that they can use VMware USB pass through capabilities to provide appropriate connectivity. They will need both wired and wireless capability. Rather than carrying around 2 adapters, was hoping we could get a combination unit so that we can reduce it to 1. Thanks

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• Display tracert on Google or Bing Maps

  - by WebDevHobo

  Is there a program of perhaps website that can display a list of ip-adresses on Google or Bing maps? For instance, if I do tracert -d www.youtube.com, I'll get a bunch of IP-addresses, displaying the path my request travelled. I'd think it funny to see this on a map, but I find it hard to enter all these IP-addresses manually. Does anybody know a program that can do this?

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• Drop compulsive http requests same url, same IP in Apache tomcat

  - by Rodrigo Asensio

  I want to drop http request done to the same url from the same ip inside the same second. That means, its a guy violently pressing F5 or a bot screwing up my server. Do anyone knows any lib for java to avoid this or should I develop a Map in memory checking who is killing the server ?

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• google maps feeds: can I get all information ?

  - by Patrick

  hi, can I use google maps feeds to get all information about local business, restaurants, etc ? I need to build my application, not necessarily map based, about local business in my city. I was wondering if I can use google maps as dataset. thanks Patrick

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• Does gmail support image maps?

  - by Oren

  I am trying to send an image with an image map in gmail and it is not working. Does gmail currently support image maps?

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• How to set WAN side buffers for WRT54GL running Tomato Firmware

  - by Vickash

  I've recently set up a machine running m0n0wall to try and fight buffer bloat and do some traffic shaping. It was more convenient (geographically speaking) to connect the cable modem directly to my old WRT54GL, then pass everything to the m0n0wall machine and have that do the real routing work. It took a bit of work, but it's working pretty well. I have a cable connection. I have m0n0wall set up to utilize only 90% of the specified speed of my subscription, which is fine. But I've noticed that at certain times of the day (possibly when my true bandwidth drops below that 90%), there's more latency if the connection is used heavily, and traffic shaping doesn't seem to work as well. I suspect this is caused by the buffers on the WRT54GL still being unnecessarily large. If the connection is working as expected, they won't get filled, but in times of reduced bandwidth they would. Does anyone know the command I need to execute, on the WRT54GL running Tomato Firmware, to reduce the buffers on the WAN interface to the minimum size possible?

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• What's the strategy to implement a "knowledge base" in my company.

  - by Oscar Reyes

  In my current work we think we can get benefit from having a knowledge base, so the next time someone has a question/problem etc, that base can be consulted and an answer will show up. Also, it will reduce the risk from having people leaving the company with the knowledge and we would have to start all over again. My question is, what strategy can we follow to implement/buy/get/build/etc this knowledge base? Are there software ready for this? Would it be better to have something build by ourselves ( we have some programmers ) This is an small company ( < 30 ) and the base should be accessible from outside the office ( when the employees are with the customer etc.) so I guess a webapp is in order.

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• I was adding a wordpress plugin when I received message : couldn't find constant VHOST, now site has

  - by jackie

  Can anyone help me get my site back? I was adding a site map plugin with wordpress and received the message Warning: constant() [function.constant]: Couldn't find constant VHOST in /home/content / xxxxxxxxxxx /html/wp-content/plugins/wordpress-mu-domain-mapping/domain_mapping.php on line 30 Fatal error: Call to undefined function is_site_admin() in /home/content/xxxxxxxxxxxxxxxxx/html/wp-content/plugins/wordpress-mu-domain-mapping/domain_mapping.php on line 33 Now I have no site? Can it be retrieved? Any advice would be greatly appreciated. Jackie

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• Windows Server firewall asking for advice

  - by George2

  Hello everyone, I have Windows Server 2003/2008 machine, and I deployed some application on this machine. I want to put this machine in a sandbox environment, which means I want this machine to be able to access only proxy/gateway, its private used SQL Server database server, and I want to avoid network access from this machine to other machines in lab server room. Any easy solutions? BTW: my current environment is, I have a server which runs some Beta software in a Lab server room. It connects internet through proxy/gateway. Since the software is Beta, I want to reduce the risk of being hacked from internet and controlled by hacking sofwtare to attack my other servers in the same Lab server. thanks in advance, George

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• Set mouse or keyboard button to simulate left click and hold or rapid left click repeating in Windows?

  - by miahelf

  Does anyone know a way to configure Windows 7 or use third party software to do this? I would like to click my middle mouse button and have it tell Windows to left click and hold until I click the middle mouse button again. A keyboard key would be fine as well. Some games and apps have me holding down the left mouse button for a long time and I would like to reduce the stress on my mouse hand. Also, I would like to do a similar thing but have it repeatedly click the left mouse button automatically if possible. If none of that is possible, how about temporalily setting a keyboard key to achieve a left mouse button emulation?

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• Is it possible to remove/hide Windows title bars?

  - by Igoru

  I'm very used to my Linux desktop, but in my new job I'm forced to use Windows. For efficiency, I'm veeery used to minimize/maximize using keyboard shortcuts and move/resize windows using alt+mouse. Thus, window titlebars and borders are useless, and I can remove them using Compiz. My question is: is this remotely possible to be done in Windows Vista? I could manage to quite reduce the borders, but the titlebars still bother me. I also found that Win+M minimizes a window, and I think that would help with the shortcuts also. As a help to understand how I'm used to live, here's a completely normal [reduced] window of my home computer:

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• Creating a .bat file to execute mysql and other commands

  - by BCIT - JD

  I'm looking for a way to reduce the amount of typing I do to check mysql entries and other things. For example, I wanted to create a .bat file that will execute the following commands. mysql -u user -p *enter in the password* USE databasename SELCT * FROM table; The problem is after the initial mysql -u user -p the rest of the commands written down do not get executed. Is it possible to continue running commands after calling something like mysql or other programs, that seem to add its prefix(?) to the beginning of commands (mysql). I'm not very familiar with the terminology so forgive me if it sounds confusing. I'd like to use the same kind of concept for other things as well. Help is much appreciated, Thanks.

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• Clonezilla disk to disk clone on a dual boot ubuntu karmic & XP setup - cannot open '/boot/grub/devi

  - by srboisvert

  I just tried to clone a failing existing boot drive for a dual boot system with Ubuntu karmic and Windows XP installed using Clonezilla. The cloning worked fine right up until the end when I got the following error: Running: grub-install --no floppy --root-directory=/tmp/hd_img.twABYW /dev/sdb grub-probe: error: Cannot open '/boot/grub/device.map' /usr/sbin/grub-install:line 374: [: =: unary operator expected What's my next step? I imagine I need to somehow rebuild my boot record for Windows and Ubuntu and edit grub.

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• Why do the fonts in the Java application I'm running look different in Mac OS X than in Windows?

  - by Mikey

  Shouldn't they look exactly the same? Or does Java not have its own fonts? Does it just map font names to OS fonts?

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• Differences in memory consumption between two identical D7 sites?

  - by aendrew

  I'm running Drupal on a news site that has a lot of different View blocks on the front page (~5 total, all cached). In trying to reduce the memory footprint of the site, I've checked out source from SVN to a local development install to try and convert some of those blocks into more optimized code. Here's the weird thing. Devel module lists memory consumption at 50mb on the Production site (Running Nginx, PHP 5.2.17, XCache and Zend Optimizer.) but only 14mb on my development site (Running Apache2, PHP 5.2.13 and XCache). These are nearly-identical versions of the same site — frankly, the Production site should use even less memory as I've disabled some of the modules running on the Dev site. Any idea why this might be the case?

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• Better way to stop/start Webmin and SSH

  - by Jake

  Hi, it would be a good idea to not have webmin running all the time... just start it via ssh when I need it... so, I just stop webmin,and leaving SSH always running... when I need to access webmin, I start it through SSH. but there are lots of people from many country trying to bruteforce my SSH. I can reduce bruteforce using iptables. but because Im feeling still not safe (about 3 months ago), so I stop SSH and leaving webmin always running through custom port. I just start SSH through webmin when I need. and the result, no more bruteforce on SSH, and no bruteforce on webmin (maybe because the attacker dont know my webmin custom port) but I think this is still not really safe. and I cannot restrict access to some IP because I use random IP. If I stop both SSH and webmin, I will lost access to my server. Anyone know the better way dealing with this?

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• Cannot SVN checkout when anon-access = none

  - by sKIPper76

  When I have anon-access = write Everything works fine. When I change svnserve.conf to: anon-access = none auth-access = write And uncomment password-db and authz-db AND add user in authz with rw AND put username/password in passwd, nothing works. Eclipse keeps giving me a "Cannot map the project with svn provider" error. I have given all the files under conf 777. Any ideas what's wrong?

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• Explanation of WCF application life cycle in IIS 6 hosting environment.

  - by David Christiansen

  Hi all and thanks for reading, I have a delay issue where my application takes a long time to start up when first called after an determinate period since the last call. The web application is a WCF service and we are talking about a delay of ~18seconds before the actual processing starts. Now, I believe I know how to reduce this delay so that is not my question (it's more a stackoverflow deal anyway) My question is, Can anyone explain to me why is it that despite me disabling worker process shutdown, and worker process recycling the application still 'winds down' after a indeterminate period of time of inactivity? To understand this I need to know more about the innerworkings of WCF services hosted in IIS. I fully expect there to be a straight forward answer to this. Thank you v. much for any help you may offer, DC

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• Improving Chrome performance on OSX

  - by Giannis

  There are a number of sites that do not display properly on Safari and I need to switch to Chrome. Although when the content of the sites requires flash player, Chrome will consume a significant amount of CPU. Running more than 3 windows, will cause my MBP to overheat, start the fans, and reduce battery life way more than Safari. What I am looking for is suggestions on ways to improve performance of Chrome running flash. I know Safari is optimised for OSX, but any improvement is welcome. Following I have a demo to display the issue. I am running same youtube video on Safari 6 and Chrome 21,both updated,at the same time. Both browsers have been reseted and have no extensions. This is run on MBP 13" 2012 with 2.9 i7 running OSX 10.8.1. p.s If any additional details can help please let me know.

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• iWork '09 Keynote: is there is straightforward way to 'dim' and 'highlight' each item in a bullet li

  - by doug

  I have a bullet list on a slide: first item second item third item What I want to do is show those three bulleted items in a sequence like this: first bullet appears first bullet dims second bullet appears second bullet dims third bullet appears third bullet dims In other words, only one bullet is shown at a time (the one i am current discussing) to reduce audience distraction by what comes next or what i just finished discussing (the prior bullet). This is such a common thing to do, there's got to be a simple, reliable way to do it. The only way I know of is to configure the items individually (using "Build In" and "Action" on each bullet item, which is not only slow but doesn't work well). Another way i've found--which, again is very slow--is to create my bullet list not by selecting a bullet list, but to build the list manually with text boxes (one bullet item per text box) then line them up as a list. This way it's easier to manipulate them independently--again though, takes way too long to do one slide this way.

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