In pre 2.0 VirtualBox seamless mode was only for Windows guests on linux hosts. Now Linux guests on Windows hosts benifit from this invaluable feature. Albeit there are not many instances where a graphical linux program is require without a Windows alternative, but if need be the feature is available.
Just boot up your guest, and hit your hotkey + l and viola, VirtualBox rips the gnome, or kde docks right off the desktop and slaps it into Windows. Frankly it can’t get much better than this, and my main hopes for the future is better linux kernel support further reducing host CPU load when the guests are idle. This will further realize the dream of virtualization, which is the deployment of multiple virtual machines on a single host system. The less host CPU load experienced results in more guest OSs being deployable.
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If you want your Mediawiki installation to properly display from the following example subdomain:
wiki.bgevolution.com
You will need to add the following to your LocalSettings.php configuration file:
$wgScriptPath =”";
You will also have to adjust the ANAME records of your DNS server to make sure all subdomains are forwarded to your servers IP address. Use the wildcard (*) and everthing should be find. You will also need to create a name based apache virtualhost to receive the incoming subdomain request. Something like the following works fine:
<VirtualHost *>
HostName wiki.bgevolution.com
DocumentRoot: /home/user/mediawiki/
</VirtualHost>
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Nagios allows you to graphically monitor your virtual servers from a single web page. No longer will you have to load each individual website or web service in order to verify consistent operation. Nagios can be downloaded directly from their website at:
http://www.nagios.com
On the Nagios homepage is a link to a 15 minute tutorial, which is relatively straight forward, and works like a charm. My next blog post will cover the same material that is included in their 15 minute tutorial. In this post I want to briefly discuss which guest operating system to use for maximum stability. I highly recommend Ubuntu JeOS for your virtual OS specifically because the kernel works flawlessly with the host operating system. To recap, I currently use Debian Etch as my host OS, and with JeOS as the guest the host CPU load is only active when the guest is actually processing data. I previously used Debian Etch also as the guest OS, and it would have a constant CPU load on the host. This was not at all desirable, and with a quick transition to JeOS the problem was swiftly resolved.
The first step to get Nagios up and running in a VirtualBox guest OS is to install a clean JeOS in a new guest OS.
Step 2 is setting up Nagios. You can follow the 15 minute tutorial on their website, which is indeed perfect, but I will also post the procedures asap.
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