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yED is an alternate or replacement of Microsoft office Visio on Ubuntu Linux. it is generally used to generate high-quality diagrams.

ClusterSSH(cssh) is a cluster administration tool,it is used to make the same change on multiple linux servers at the same time.

Apple has not released or provided Linux/Unix version for iTunes yet. But using emulation software like PlayOnLinux , we can install iTunes software on Ubuntu Linux. PlayOnLinux is a graphical tool to run windows-based applications(specially games ) on a Linux platform. The system provides wrapper shell scripts with a .pol filename extension which specify the configuration of Wine needed in order to install and run a particular application. PlayonLinux is basically a graphical frontend for Wine.

PAC (Perl Auto Connector) is an open source secure connection manager with automations. PAC is the replacement of SecureCRT/Putty in the the Linux world. It provides a GUI to configure SSH/Telnet connections: users, passwords, EXPECT regular expressions, macros, etc.

As Apache is most widely used WebServer , so in this document we will learn how to make secure communication between Web server and Client using SSL Certificates.

Password Less authentication to Linux servers makes the system admin's life easy. To Implement password less or Keys based authentication we have to generate Public and Private keys

Rcron is a powerful tool that helps system administrators in setting up cron jobs redundancy and failover over groups of machines. RCRON ensures that a job installed on several machines will only run on the active one at any time.

In Linux Like operating system , we have the variables like http_proxy,ftp_proxy and https_proxy through which we can access the Internet via proxy on linux console. All of the above mentioned variables are can be used with tools like elinks , wget , lynx , rsync and others. I am assuming Linux servers are behind the proxy servers and can get the Internet connection only via proxy settings.

“uptime”, “w” & “top” commands are used to check the uptime of Linux Servers.

Spacewalk is an open source configuration management tool sponsored by Red Hat. Spacewalk is alternate of Redhat network satellite server on Centos / Fedora / Scientific Linux. Spacewalk is the upstream project for the source of Red Hat Network Satellite.

with help of “ps” and “pidof” commads we can determine how much cpu and memory is consumed or used by particular process and command.

The binary log contains events that describe database changes such as table creation operations or changes to table data

In Most of the UNIX like operating System swap partition is created during the installation time , However with the kernel 2.6 swap files can be used as swap partition.

Follow the steps After inserting the XenApp DVD in the Windows 2008 R2 Server you would choose Install XenApp Server.

GlusterFS is an open source network / cluster filesystem and based on a stackable user space design.In this tutorials we will achieve high availability of storage,

reposync is used to download an entire remote yum repository or a set of remote repositories. It will also synchronize changes in a repository with a local directory.

The term Virtual Hosting refers to the practice of running more than one web site (such as site1.nextstep4it.com & site2.nextstep4it.com) on a single machine.

chattr is a command in the Linux operating system that allows a user to set certain attributes on a file residing on an ext2/ext3/ext4 based filesystem

The concept of a cluster is that the cluster itself appears on the outside as a single system & provide high performance and high availability.

In Linux/UNIX :SetUID, SetGID and Sticky bit are special permissions on files and directories.Using chmod command we can implement the special permissions on file and directories.