Configuring CENTOS 6.4 minimal install for Wireless without NetworkManager using WPA_Supplicant

I found myself configuring a lot of CentOS based devices as nodes for my lab environment. Sometimes it is easier to connect them wirelessly than having a bunch of cables around. Since I use this nodes with CentOS 6.4 minimal install, getting the wireless to be the primary uplink interface requires a series of steps.

First we need to install the wireless tools and other tools that we need for wireless encryption configuration and so on. So, the first step is this:

yum install wireless-tools wpa_supplicant dbus

BIND/named with PostgreSQL back end at CentOS 6.4

I've been trying to find a good documentation on setting up Bind with PostgreSQL as its back end. So far the information is sparse so I've decided to put this recipe together. There is much more than this but the idea is to give you a start.

1) First, make sure you have bind, bind-sdb, postgresql-server RPMs (and their dependencies) installed.

2) After having the RPMs in your system, you have to configure the iptables to allow DNS queries. Edit /etc/sysconfig/iptables to allow queries to the DNS port. Include the following statement after the SSH entry:

-A INPUT -m state --state NEW -m udp -p udp --dport 53 -j ACCEPT

Make sure you reload your iptables for this change to get the new rules into effect.