1．/etc/sysconfig/network-scripts/ifcfg-eth0
NIC configuration file, under different circumstances might "eth0 section is slightly different."
Restart the card can operate as follows:
#service network restart
This operation for all network cards.
2．/etc/resolv.conf
Setting linux local DNS client files, DNS can be achieved with each other to resolve domain names and IP
3．/etc/sysconfig/network
You can modify the machine name and the card starts, gateway configuration
4．/etc/hosts
Set the user name and IP (or domain name) of the corresponding analytical table, corresponding to the local LAN DNS, C similar to the windows: \ WINDOWS \ system32 \ drivers \ etc \ hosts.
5．/etc/fstab
Record boot to mount a file system file
6．/etc/re.local
Storing boot from the start program command file (chkconfig can only manage startup programs yum rpm installed programs /)
7．/usr/lib/systemd/system/ctrl-alt-del.target
Run level of the system when the system is set to start (centOS7 are called targets) and related startup to load the configuration file
8．/etc/exports
Setting a network file system NFS profile
9．/etc/init.d
Used to store system or server startup script to System V mode, which is more common during system startup or initialization to System V mode. As CentOS, RedHat like.
10．/etc/profile
System Global configuration path environment variable
11．/etc/profile.d
Loading system login program, command or file alone.
12．/etc/issue
Record information (system version, kernel version) display before user login
13．/etc/motd
Store the login prompt
14．/etc/redhat-release
Including statements row RedHat system version and name
15．/etc/group
Set the user's name and group information
16．/etc/passwd
Store account information files
17．/etc/shadow
Store the password file
18．/etc/sudoers
sudo命令的配置文件
visudo命令就类似于vi /etc/sudoers命令。
19．/etc/securetty
设定哪些终端可以让root登录
20．/etc/login.defs
所有用户登录时的缺省配置文件
21．/etc/rsyslog.conf
日志设置文件(CentOS 6.x版本以上)
22．/usr/local
该目录为用户自编译安装软件的存放目录，相当于windows下c:\program files
23．/usr/src
内核源码的存放目录
24．/var/log
各种系统日志的存放目录
25．/var/log/messages
系统信息默认日志文件，按周自动轮循
26．/var/log/secure
记录登入系统存取信息的文件，按周自动轮循，如pop3，ssh，telnet,ftp等都会记录再次。
26．/var/log/wtmp
记录登录者信息的文件
27．/var/spool
打印队列和其他队列工作的目录.每个不同的spool在/var/spool下有自己的子目录,如，用户的邮箱在/var/spool/mail 中。
28．/proc
虚拟目录，是内存的映射，内核和进程的虚拟文件系统目录
/proc/version
存放内核版本
/proc/sys/kernel
系统内核功能
29．/etc/rc.local
存放开机自启动内容的文件，一般针对通过源程序编译安装的软件（chkconfig管理yum/rpm包安装的服务）
