KVM Nested virtualization. For my current project I needed to perform nested virtualization on KVM using Ubuntu 12.04, and I encountered the VM would pause itself after showing the bios. That error dragged me to the logs where this line called my attention: And digging I found out its a bug knwon issue with the 12.04 kernel,

The basics: Virtualmin is a powerful and flexible web hosting control panel for Linux and UNIX systems based on the well-known Open Source web-based systems management GUI, Webmin. Manage your virtual domains, mailboxes, databases, applications, and the entire server, from one comprehensive and friendly interface. I really recommend using Virtualmin, it made my life so

How to install PDF2SWF, PDFTools in Debian. First you need the needed repositories. The first solution. Given that, not even then I got to install it, proceed and clone the master branch on Github, that seems to work perfectly fine. So the solution I found somewhere:

Many times our servers struggle to answer to connections in time, this is why we need to optimize. First we assume we have installed Virtualmin on Debian 7. Second, we assume you know some of PHP and common Linux utilities. We’ll install memcached and php5-memcache [Memcache plugin for memcached]. php5-memcache and memcached We are assuming

Jarvis – DLA (Digital Life Assistant)

The idea behind MultiAll Abstract: The problem of managing multiple servers that do basically similar stuff and are used to host in house applications. Avoiding configuration time hogs, and automation of server configuration allowing fast deployments with no scaling limit. The problem: The problem with MultiAll is the fact of having all the servers on

Optimizing PfSense for home use, and to optimize bandwidth used. Edit /boot/loader.conf.local Change kern.ipc.nmbclusters=”0″ to kern.ipc.nmbclusters=”32768″ Reboot the pfSense router Some people have also seen better performance by using the ufs cache filesystem setting. When using ufs filesystem you could possibly increase vfs.read_max=32 to vfs.read_max=128 in System -> Advanced -> Sytem Tunables.

Disk usage: working with du command in linux. Sometimes we need to work with disk usage in linux terminals, and working with files as for example to find biggest files in the system for rogue backups or files or simply contraband. Lets go with: Find folder size in human readable [Gigs, Megs, Bytes…] On the

Making 3D work with OpenSuse and my Intel integrated graphics. If you activate 3D acceleration yet you get a message stating that your guest does not support it… you can try this out: Add pacman to your repos! That you can actually find here: [Complete List](link is external) I won’t go into how to add them

Configuring Munin on a Debian 7 system for monitoring of server. Following we’ll install all we need to make munin service run, and be optimized to what we need to monitor. Lets install munin: Let’s enable some default plugins: Now let’s start editing the server configuration: More or less you should see something like this.

SSHFS-MUX TakeLAN Now testing on its servers this package with some patches to meet our own “Cloud” requirements. Background to what is SSHFS-MUX: SSHFS-MUX is an extention of SSHFS (SSH Filesystem)(link is external), it is able to mount many remote hosts to a local mountpoint at the same time over SSH channels. Although the functionality of

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