Unix, Linux, DevOps , Cloud computing and BigData Knowledge-Base

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Hands on LAB – Configuring LAMP STACK for Web Applications- cookbook

  The Internet World , we live today ,completely filled with web pages and applications. In the initial days, web sites were just limited to static html pages and the traditional web servers like Apache fulfilled the purpose. But now the current trend is dynamic web pages which...

6

Hands on Lab – Replacing Failed Disks from ZFS Pools ( RaidZ2 / RaidZ3 ) – Part2

    In my earlier hands on lab post ( Hands on Lab – Replacing Failed Disks from ZFS Pools ( Simple / Mirrored / RaidZ )). I have explained the disk failure scenarios for ZPOOL  mirror and RaidZ volumes, and this post is just continuation to that...

9

Powerdown parameter for Solaris boxes.

I came across one unique parameter which I would like to share on our gurkulindia, specially for small business organisations where we dont have seperate power backups for DC. Has anyone noticed while working on Solaris boxes if you will power down (init 5 or poweroff...

5

System Controller battery (BATTERY at SC/BAT/V_BAT has exceeded low warning) failure in T-series servers.

System Controller battery (BATTERY at SC/BAT/V_BAT has exceeded low warning) failure in T-series servers. Many a times you will get a hardware error in /var/adm/messages (or at ALOM/LOM prompt, console messages) for SC battery failure, In this post I will explain the battery replacement procedure along...

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...

14

Deployment and understanding of LDOMS (Logical Domains)

Deployment and understanding of LDOMS (Logical Domains): Ldom technology allows us to allocate a system’s various resources such as memory, CPUs and devices (I/O,Networl interfaces etc) into logical groupings and create multiple, discrete systems each having their own operating system, resources, and identity within a single...

11

Linux Network Troubleshooting

Network connection problems include slow connections, as well as complete loss of connectivity. Factors that may cause slow connectivity include incorrectly configured domain name system (DNS) settings, inefficiently configured routing tables, inferior cabling, overloaded servers, and network congestion. The same set of factors, as well as...

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