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System administrators often want to setup audit trail for accounting purposes. When something abnormal happens, they want to know what happened on system side, when it happened and  who did that. An effective way of audit trail is kind of…

Control groups (a.k.a. cgroups) allow you to allocate resources — such as CPU time, system memory, network bandwidth, or combinations of these resources — among user-defined groups of tasks (processes) running on a system. You can monitor the cgroups you configure, deny cgroups access…

Sometimes I need to kill an established TCP session especially the long time running TCP connections that doing barely nothing, without killing the process that opens it.

Debian Squeeze (6.0) is a kind of “Old Stable” branch of Debian, the official support for this version ended in April 2014. Squeeze is still used on many servers, so a group of Debian developers decided to provide security patches…

I was using TP-Link WN725N on Raspberry Pi, it worked smoothly well even without any additional configurations. While when I plugged it on a Debian desktop, I noticed that the adapter cannot work at all.

Labeling partitions or volumes is a file system feature.  There are typically two commands to set label name for a partition of ext2, ext3 and ext4 type. Both of these commands are from e2fsprogs.

Uninstalling MacPorts can be very easy, you basically need just two commands to get the work done. Before removing MacPorts, please make sure the removal won’t cause any trouble. Depending on the issue you are experiencing, you may not need…

The third update of its stable distribution Debian 7 (codename wheezy) was released December 14th, 2013. This update mainly adds corrections for security problems to the stable release, along with a few adjustments for serious problems. Lists of fixed bugs…

How can we create a USB Memory Stick for Debian 7.1 (Wheezy) installation? Well, it’s very easy compared to my thought. It takes several minutes to create a USB memory stick to install either Debian i386 or AMD-64. Here our example…