IPtables (Netfilter) :
IPtables is the default firewall for Linux. Its a vast subject which can not be covered in one post. I will try to give as much info as possible at the same time not to make it complex. Lets start with basics.
What is a firewall?
Ans : A firewall is a part of a computer system or network that is designed to block unauthorized access while permitting authorized communications –Wikipedia.org… Continue Reading
Some days back I faced a strange situation.. which i felt very much bad on my self. I have a word with one of the Orkut user who is in search of a Linux admin job. He scraped me “if any openings please inform me..” I got little bit angry and with out second though I given him a bad reply 
which is very much my fault. Then he replied me saying that i have … Continue Reading
Though this is a basic topic known to many of you, But I want to share so that some one will get new things.
BASH(Broune Again Shell) is the default shell in Linux, which will act as a communicator between Kernel and user. Its having so many capabilities such as
a.Short cuts
b.Command chaining
c.History
As I mention we will see all about BASH shell history capabilities here. And I … Continue Reading
Major differences between RHEL4 & RHEL5
1.Virtualization added in RHEL5
2.Package installation method changed to YUM(Yellow-dog Updater Modifier) in RHEL5
3.Redhat Clustring added in RHEL5
4.RHEL5 now supports unlimited RAM and Hard disk
5.Now varients in RHEL5 are
* Red Hat Enterprise Linux Advanced Platform (former AS)
* Red Hat Enterprise Linux (former ES) (limited to 2 CPU-s)
* Red Hat Enterprise Linux Desktop with Workstation and Multi-OS option
* … Continue Reading
How to Open/edit large files using VI?
Ans : Some time you will get message like file is too large to open with VI editor or some sort of other error messages like.
For Example : Warning: Tmp file too large
This doesn’t mean that you don’t have enough space to open the file in /var/tmp (this is default VI editor temp location). This is because VI is having limitation in opening … Continue Reading
Chittaranjan: It will be better if you'll put about Linux Cluster and Storage, coz now-a-days ...
This is a detailed explanation post about Set GID(SGID) bit in Linux.: [...] Example: Linux Group quota implementation [...]This is a detailed explanation post about Set GID(SGID) bit in Linux.: [...] our ongoing File and Folder permissions in Linux. We already discussed abo ...What is Sticky bit and how to implement Sticky bit in Linux: [...] Folder permissions in Linux. We already discussed about CHMOD, UMASK, C ...What is Sticky bit and how to implement Sticky bit in Linux: [...] is next to SGID in our ongoing File and Folder permissions in Linux. We ...
