Clustering Environments

                The article represents a short guide to understanding clusters and their benefits. It briefly reviews the advantages of such setups, while also offering some helpful hints, and other practical things that one should keep in mind when considering such setups.

Diameter in the IMS

                The 3GPP standards body has adopted Diameter as the primary signaling protocol for AAA and mobility management in the IP Multimedia Subsystem (IMS). The IMS is the service delivery environment for real-time multimedia services for the 3rd Generation wireless network and is also an ideal architecture for service convergence across fixed, wireless, and corporate enterprise networks. IMS offers a secure, mediated access to value-added services and network resources inside a managed core IP network while providing open interfaces for third party developers and enterprise-based applications that need access to the trusted carrier.

Build a Fedora Live CD

            In December 2006, the Fedora Linux distribution released its first official Live CD, which, thanks to an intelligent selection of applications, nicely advertises the best features of Fedora. In addition to many applications, the Live CD has several games, uses the Compiz 3D desktop, and is accessible by non-English speaking users. But what stole the show for me was David Zeuthen's livecd tools, which make creating and maintaining a custom Fedora-based Live CD a walk in the park.

Zeuthen is the developer of Pilgrim, which creates system images that can run off USB flash drives for the One Laptop Per Child project . The livecd tools used for creating the Fedora Live CD is a rewrite of Pilgrim in Python. It can be used for creating live CDs out of Red Hat Enterprise Linux, CentOS, and other downstream Fedora distributions.

Eight ways to speed up your shell scripts

        Few of the tips to speed up the execution of your shell scripts
 

Five Shell Programming Tips

 I recently read this article Good Shell Coding Practices on handling command line arguments in scripts. I am going to cover some tips for general shell programming I have learned over the years.

Setting up SSH keys for access without a password

 If you manage more than one or two hosts, you likely have to type the same password too often. This can get quite annoying. SSH allows you to setup a public and private keypair. Using these keys, you can connect to any host which has the public key, from any host which has the private key, typing your password only once.

Killing all processes for a user

 Lets say you want to kill all processes for a specific user. Maybe they are taking up too many resources or there is an application that runs under the user which needs to be forcefully killed. Here is a simple script to do so:

Run Remote Commands with SSH

    The ssh command is an amazing program. You can use it for opening sessions between server or you can use it run a command on a remote system, non-interactively