Categories Archives: Technical

Xen 4 and Libvirt From Source on CentOS 6

Posted on June 25, 2012 by Randy

Install some prerequisites: yum groupinstall “Development Libraries” “Development Tools” yum install mercurial python-devel dev86 iasl ncurses-devel ncurses \ glib2-devel glib2 openssl-devel yajl-devel libuuid-devel libuuid \ pciutils-devel pciutils texinfo kernel-xen bridge-utils gnutls gnutls-devel \ libxml2 libxml2-devel libnl libnl-devel libxslt libxslt-devel pygtk2 xorg-x11-xauth \ xorg-x11-fonts* device-mapper* gnome-python2-gconf pygtk2-libglade dbus-x11 \ gtk-vnc-python netcf netcf-devel netcf-libs vte vte-devel Pull […]

Portable Wifi KVM-over-IP with Serial Console and Network Bridge

Posted on May 23, 2012 by Randy

Spider KVM’s are already very cool as they are — KVM, virtual media, and serial console with a flawless web/Java client. But if you strap on a Wifi bridge, it’s way cooler. As a bonus you get wireless network access via the Cascade port — anyone who has done an emergency router or switch replacement […]

Set DNS and Default Route in PFSense from Console

Posted on April 12, 2012 by Randy

Permanently? Not so easy. Temporarily, easy. echo “nameserver x.x.x.x” > /etc/resolv.conf route add default y.y.y.y Where x.x.x.x is your DNS and y.y.y.y is your gateway. Once you’re in the GUI, fix up the settings properly and you’re good.

The mysterious /tmp/.tmp folder

Posted on February 3, 2012 by Randy

If LFD reports a /tmp/.tmp folder on your server you have been hit with the latest timthumb.php hack, which is circulating among wordpress sites which dodged the first mass infection last August for unknown reasons. The /tmp/.tmp folder contains a list of firefox visitor IP’s who have visited your site and were exposed to malicious […]

Automatically update all vulnerable timthumb files on Cpanel

Posted on January 30, 2012 by Randy

timthumb.php is responsible for millions of wordpress hacking so it is important to make sure all timthumb files on Cpanel servers are up to date. It may have any file name (sometimes thumb.php or another) so we have to look in every php file for vulnerable versions and replace them. The script automates this. This […]

Test IOPS and disk throughput in Linux

Posted on January 20, 2012 by Randy

Excellent article on testing IOPS and throughput of Linux disks and filesystems. https://www.linux.com/learn/tutorials/442451-inspecting-disk-io-performance-with-fio

PHP IPv4 and IPv6 Network and Subnet Calculator

Posted on January 11, 2012 by Randy

Just threw together a quick and dirty PHP-based subnet calculator. What sets this one apart from others is that it works with both IPv4 and IPv6 inputs and has subnet splitting capability. Use the first field to enter a network to get details about. The format is CIDR notation ‘1.2.3.4/22’. Use the second field to […]

MegaRAID Storage Manager on Ubuntu for LSI cards

Posted on September 30, 2011 by Randy

Getting MegaRAID Storage Manager and CLI tools installed on Ubuntu is no fun.

Using badblocks to test and wipe disks

Posted on August 18, 2011 by Randy

Non destructive (read only) test, optimized for 1G RAM: badblocks -b 4096 -c 98304 -p 0 -s /dev/sda Destructive read/write test (use caution!): badblocks -b 4096 -c 98304 -p 0 -w -s /dev/sda

Windows 7 / Vista DNS Suffix only one level deep

Posted on August 18, 2011 by Randy

Major annoyance to any organization that has hostnames like foo.bar.domain.com — Windows 7 and Vista appends domain.com to bar, but not foo.bar. After some digging I finally found a registry hack that restores ‘proper’ functionality like any other OS or older version of windows. Create a DWORD ‘AppendToMultiLabelName’ with a value of 1 in: HKEY_LOCAL_MACHINE […]

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