The Linux Juggernaut

1)Give me 15 commands which you use frequently

Depends on the environment you work. Some examples are

mkdir — For creating folders( use -p option to create multiple folders at a time)
ls –List folders/files( check what ls -1 do)

top — To monitor system activities

lsof –To check whats happening on the server and which process open which file.

netstat -tcp –Gives you complete picture about network connection details.

vnstat –Gives you Network band … Continue Reading

This is bit important post on understanding the ports, their details and numbers.

Some FAQ related PORTS

Q. What is a port?

A port is software docking point in your machine where remote application uses for communication. This is analogy to the physical ports for entering in to the Countries.

Q. What is hardware port?

This is physical peripheral connection point to a machine from a physical device.

Q. What is a socket?

Socket is … Continue Reading

1)Define a deamon?

2)Can we use crontab to run a script per second? if yes how? if no why?

3)How to create a deamon with shell scripting?

4)What is DDNS and how it works?

5)Which mail server is secure  Sendmail or Postfix?

6)How can i check exit status of my previous command?

7)I have a file each line contains “/var/www/html”, replease this entry in all lines with “/home/xyz/red”  with single command or an editor

8)How … Continue Reading

This is a common question asked by Interviewers, When ever I remember this question I do get laugh. What is this guy asking such type of question which I don’t know how to answer. But if you think seriously you will come to know about you how capable you are in Linux Administration and will make you think are you different from other admins.

If you give very normal answers like

1)I am a graduate.… Continue Reading

Its been long time that I blogged here. The reason for this post is to share my experience of an interview. If you people think this is irrelevant, please feel free to comment at comment section, depending on your comments i will keep or remove this post. Because its just a general post not related to admin work much. OK lets come to actual point.

A couple of weeks back i got a call from … Continue Reading

If you are preparing for interviews for linux admin jobs you should be familiar with below concepts..

1) Port number of different servers {cat /etc/services}
2) Linux Installation(through FTP,HTTP,NFS)
3) Boot process
4) Diff b/w ext3 and ext2
5) RAID LEVELS and Selection of raid
6) backup methods
7) Package management such as Yum server
Kernel Tuning
9) IPTABLES
10) TCP WRAPPERS
11) DIFFERENT RUN LEVELS
12) USER AND GROUP MANAGEMENT
13) QUOTA SETTING(user and … Continue Reading