Scenario Video – Understanding Unix Process Management and Job Scheduling Responsibilities
Category: Beginners Lessons
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...
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...
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...
Unix Admin Reference – RAID ( Redundant Array of Independent Disks )
1. What is RAID? RAID is an acronym for Redundant Array of Independent Disks. A RAID system consists of an enclosure containing a number of disk volumes, connected to each other and to one or more computers by a fast interconnect. Six levels of RAID are...
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...
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...
