Category: Beginners Lessons

12

SSH Tunnels – System administrator’s friend or foe?

Let us assume that our system administrator Jack is supporting for a server environment in which a small set of servers  are located in DMZ (Demilitarized zone ) network . In order to connect any DMZ server Jack has to ssh from his machine (windows PC/Unix...

2

Understanding Network VLANs

Virtual LANs or VLANs are virtual separations within a switch that provide distinct logical LANs that each behave if there were configured on a separate physical switch. Some Important points about VLANS.  All the servers connected with in a VLAN will have same broadcasting domain, and...

6

Ten most frequently used Linux networking services, in enterprise unix networks

  In this post I am just talking about top 10 networking services that are commonly used in enterprise linux networks. Below are the top 10 Services, and it is worthwhile to know for the beginners to understand the purpose of each service, procedure to manage...

27

VCS ( Veritas Cluster Services ) Beginners lesson – Cluster Membership & IO Fencing

The current members of the cluster are the systems that are actively participating in the cluster. It is critical for HAD to accurately determine current cluster membership in order to take corrective action on system failure and maintain overall cluster topology. A change in cluster membership...

37

Experience LINUX LVM (Logical Volume Manager) with real time examples

1.) What LVM is? 2.) Terminology 3.) Creation of Physical Vol, Volume Group, Logical Volume, Filesystem creation, Mount and making the FS entry in /etc/fstab 4.) Add new disk under existing Volume Group 5.) Filesystem extension in Linux 6.) Filesystem shrinking in Linux 7.) Removing disk...

4

VCS (Veritas Cluster Services ) Beginners Lesson – Cluster Communications

    In our previous post “Beginners Lesson – Veritas Cluster Services for System Admin” we have discussed the fundamentals of clustering and it’s purpose. In this post I would like to take you little deep inside of the clusters just to explore how the VCS...

14

VxVM Beginners – Commands and Examples – Part 2

This is a continuation post for our previous post Beginner’s Lesson – VERITAS Volume Manager for Solaris Learning VxVM administration will be much easier by understanding below three things> 1. How Veritas Volume Manager treats Operating System Native Disks into Veritas Volumes 2. What are the...

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