Although most of my test servers are registered with RackSpace, I thought that it would be a good idea to review AWS for some of my less technical colleagues that are interested in gently stepping into the Cloud Server arena. AWS offers a free tier service for 12 months using the t1.micro instance for 750 hours. However, a credit card will be required to setup an account so they may easily charge you if you decide to upgrade to another service level. Although this straightforward 25 step process will help you get up running with a RHEL 6.4 server, you should read the AWS documentation and FAQs to understand how the system works and pricing levels.
1. Go to the Amazon website and click “Get Started for Free“,
Continue reading Amazon Web Services : RHEL 6.4 Setup
From the Service Provider’s Perspective
In part one of this topic, we discussed how to manage a sub-delegation for reverse DNS records once your ISP provides this service for you. Here in part two, we’ll discuss how to provide the sub-delegation of a reverse DNS range to another user. So in this situation, think of yourself as the provider offering the service for a customer or end user.
What You’ll Need
After you have received the request from the customer, you will need to confirm that they have created the proper zone for the Continue reading How to Sub-Delegate Reverse DNS Records Part 2
The Purpose of DNS Sub-Delegation
Let’s say you have acquired a static IP range from your ISP. Now that you have that range, you decide you also want to control the
PTR records for these addresses as well. But,
PTR records typically belong to the ISP. However, you do not want to depend on the ISP for each change you’d like to make; you want more control. How can your gain more control over those
The way to gain this control is through DNS Sub-Delegation. DNS Sub-Delegation is when your ISP forwards
PTR requests to your name server so that you can have control over your record updates. In other words, the ISP delegates their authority over their
PTR records to your DNS server.
If you understood the implications of that last sentence, you’ll realize that you will need your own local DNS service that controls your domain. After all, if you don’t control your own domain, how are you going to control the
PTR records once they are delegated to you? In this post, we’ll assume that you will manage your
PTR records with your own DNS server. Continue reading How to Sub-Delegate Reverse DNS Records Part 1
Why bother with tftp?
Many network devices such as Cisco routers and switches use
tftp in order to download their IOS config updates.
tftp can also be used for network based installs or for booting up diskless systems. Knowing how to setup a
tftp server comes in quite handy when circumstances like these arise.
Getting started . . .
The Network Topology
Let’s say we’re dealing with a private network– 192.168.100.0/24. We’ll designate our
tftp server and
tftp test client as 192.168.100.5 and 192.168.100.105 respectively. You will need
superuser privileges on both your server and client in order to successfully perform all of these commands.
Get the Necessary Packages
Log on to 192.168.100.5 and download the necessary programs; make sure they survive reboots:
# yum install tftp-server xinetd
# chkconfig tftp on Continue reading How to Setup a TFTP Server Under CentOS/RHEL 6