30 Best Sources For Linux / *BSD / Unix Documentation On the Web

in Categories Debian Linux, FreeBSD, HP-UX, Linux, Linux distribution, OpenBSD, RedHat/Fedora Linux, Ubuntu Linux, UNIX last updated January 9, 2018

Man pages are written by sys-admin and developers for IT techs, and are intended more as a reference than as a how to. Man pages are very useful for people who are already familiar with Linux, Unix, and BSD operating systems. Use man pages when you just need to know the syntax for particular commands or configuration file, but they are not helpful for new Linux users. Man pages are not good for learning something new for the first time. Here are thirty best documentation sites on the web for learning Linux and Unix like operating systems.

FAQ Updates: Dec/22/2011

in Categories Sys admin last updated December 21, 2011

Our FAQ section is updated in last few days with new howto:

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Linux: 25 Iptables Netfilter Firewall Examples For New SysAdmins

in Categories Iptables, Linux, Linux distribution, Linux Embedded devices, Linux laptop last updated August 23, 2017

Linux comes with a host based firewall called Netfilter. The netfilter is a set of hooks inside the Linux kernel that allows kernel modules to register callback functions with the network stack. A registered callback function is then called back for every packet that traverses the respective hook within the network stack. This Linux based firewall is controlled by the program called iptables to handles filtering for IPv4, and ip6tables handles filtering for IPv6. I strongly recommend that you first read our quick tutorial that explains how to configure a host-based firewall called Netfilter (iptables) under CentOS / RHEL / Fedora / Redhat Enterprise Linux. If you are using Ubuntu/Debian Linux, see how to setup UFW for more info. This post lists most simple iptables solutions required by a new Linux user to secure his or her Linux operating system from intruders.

Download CentOS 6.1 CD / DVD ISO

in Categories CentOS, Download of the day last updated December 12, 2011

CentOS Linux version 6.1 has been released and available for the download. It is a community-supported operating system based on Red Hat Enterprise Linux (RHEL) version 6.1. CentOS Linux is considered as the most popular Linux distribution for web servers and general purposes usage.