CentOS 4 repos back online

CentOS 4 has been EOL since March 2012.  As there is no upgrade path from 4 to 5, many of you may still be running CentOS 4 systems.

At the time of the EOL announcement, the yum repository for CentOS 4 was shutdown.  This meant that if you still needed to update packages that were recently updated in the repo, you were out of luck.

The CentOS 4 team announced that the repository has been re-enabled for people that absolutely need their CentOS 4 machine running (PLEASE UPGRADE IF YOU DON’T!).  You can re-enable the repository by downloading this file here, placing it in your /etc/yum.repos.d/ directory, and replacing the one that exists there now.

Again, PLEASE UPGRADE TO CENTOS 5 or CENTOS 6 IF YOU DON’T NEED A CENTOS 4 MACHINE RUNNING.  This news is great for people that are still migrating off of CentOS 4 or need that C4 machine as it contains many recent critical updates.  For example, recent OpenSSL vulnerability patches.

Understanding Traceroute

Richard Steenbergen has released excellent slides and a technical document on Traceroute from a presentation he gave at a networking conference.

You can see the slides here.  Most people will find that they’re the easiest to follow.  However, those that wan’t to dive a bit deeper into the technical networking details, you can also read his document here.

If you’re an IT Manager trying to troubleshoot latency across your network, or a web developer trying to figure out why your web server is acting so slow all of a sudden, and every in between, you’ll find this document worth the read.  It’s also a great overview for a beginner.

Thanks to Major Hayden for his initial blog post about this.

Red Hat / CentOS Bind 9 packages

Earlier this week, the Internet Systems Consortium (ISC) released an advisory about two critical security problems in the BIND 9 software.  The first problem is that BIND can keep certain domains in it’s cache that were previously deleted.  The second is a bug that can cause recursive servers to crash and leak data.

An updated version to the BIND 9 DNS software has been released.  Red Hat and CentOS have released packages for the security patch.  Update now!

More information about Red Hat 5 and 6 released BIND packages here – https://rhn.redhat.com/errata/RHSA-2012-0716.html

More information about Red Hat 5 BIND 9.7 packages here – https://rhn.redhat.com/errata/RHSA-2012-0717.html

You can read more about the issues here – http://isc.sans.edu/diary.html?storyid=13387&rss

Fedora 17 Released

Notable Changes


  • New controversial filesystem structure changes (/lib//lib64//bin/, and /sbin/ directories have been removed and are now under /usr/)
  • EXT4 now support filesystems larger than 16TB
  • Removable disks are no longer mounted under /media/, but instead under/run/media/$USER/

Linux Kernel:

  • Linux 3.3.4
  • Better power support for Sandy Bridge


  • Updated KVM version
  • New sandbox feature that allows applications to be isolated.
  • KVM management client (virt-manager) now supports USB-passthrough to attach things like USB external hard drives to virtual machines.
  • Multilayer virtual switch (Open vSwitch)
  • Better disk emulation

Release notes

You can also read more about the changes in Fedora 17 at this great H-Online article.