1. Introduction
This is the nerve center of your system, it contains all system related configuration files in here or in its sub-directories. A "configuration file" is defined as a local file used to control the operation of a program; it must be static and cannot be an executable binary. For this reason, it's a good idea to backup this directory regularly. It will definitely save you a lot of re-configuration later if you re-install or lose your current installation. Normally, no binaries should be or are located here. [detail]
2. Category
[Network]Firewall: /etc/sysconfig/iptables , service iptable restart
DNS server: /etc/resolv.conf
[File System]
Files system: /etc/fstab, mount -a
Auto mount: /etc/auto.mnt, /etc/auto.master, service autofs restart
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