Articles tagged with centos

1. How to Enable RPMforge-Extras

   Posted on July 25, 2011 in System Administration

   Historically, the RPMforge repository has aimed to create add-on RPMs for RHEL, CentOS, and Scientific Linux. Although their goal was not to replace base packages, avoiding that has not always been possible. In mid-November 2010, RPMforge created the rpmforge-extras and moved all packages that replaced base packages into the repository …

2. RHEL 6 Brings Virtualization Changes

   Posted on November 12, 2010 in System Administration

   Yesterday, Red Hat announced the release of Red Hat Enterprise Linux (RHEL) 6. For those of us interested in virtualization, RHEL brings along many changes.

   Performance

   RHEL 6 promises enhanced virtualization performance in several ways. First, the operating system is now theoretically able to handle 4,096 CPUs, 16 TB …

3. Rate-limiting SSH connections with iptables

   Posted on June 14, 2010 in System Administration

   If you have SSH open toward the Internet, you are surely aware of the number of brute force password attempts your server sees everyday. Although a good password policy may make these attempts nothing more than an annoyance, each connection to your SSH daemon takes up valuable server resources. I …

4. Postfix 2.3 and clamav-milter

   Posted on April 22, 2007 in System Administration

   You've probably been using Postfix and ClamAV for a long time. Prior to Postfix 2.3, you had to have an AMaViS daemon running to act as the glue between Postfix and ClamAV.

   As of version 2.3, Postfix now supports Sendmail 8 Milter protocol. Now you can cut AMaViS …