Please note these notes are based on CentOS/RHEL 5 – What is PAM ? The glue between authentication methods [eg one-time pwds, kerberos, smart cards] and applications requiring authentication services [eg. ftpd, sshd, imapd] etc It is another layer on 1st-Level defense in Linux. – The 4 directories we are concerned with: /lib/libpam* [3 files…
LTSP is used to setup Linux Thin Clients aka Diskless Clients. It also can be used for Maintenance server or Installation Server in infrastructure. It is very cost effective & highly customizable solution. This article will explain the concepts and implementaion of LTSP.
Many times we require to rollback package installation or patch updates on RedHat linux machines.
In this article, we will see Introduction about LDAP and OpenLDAP, how to setup OpenLDAP server and small examples. LDAP à Lightweight Directory Access Protocol. OpenLDAP à Server which operates on LDAP for eg. Microsoft AD
NetCat is called as Swiss Army Knife. Very useful tool for Administrators, Security Testers.
Many of us might have faced a stiuation where we have started a script, waiting for its outcome and suddenly someone/ourself do a CTRL+C by mistake to terminate the script. Wouldn’t it be nice if our script becomes ‘immune’ to CTRL+C signal. Here comes ‘trap’ command for help. ‘trap’ command basically traps the signal which…
If you have FTP or SSH server exposed to internet with static IP, then you may face issue of Brute Force Attack on your FTP or SSH server. In this article, we will learn how to secure our FTP or SSH server from Brute Force Attack
Perl Script to check MySQL connection.
Scenario:1 One Linux Box as a firewall having 2 Lan cards or 1 lan card and one internet modem connection.2. eth0 –> Connected to Broadband. IP is 192.168.1.2 in case of dialup it can be “ppp0”3. eth1 –> Connected to Local LAN IP is 192.168.2.1Note: In case of broadband your default gateway should be IP…
If you need to run any program or command, and then leave the shell session or ssh session, but be sure to leave the command running behind you, then you can use setsid. I know you are going to mention screen and nohup, and yes they are maybe better options, but setsid is another option.…