/etc/resolv.conf DNS client profile, gradually replaced by NIC configuration file
/ Etc / hosts file native DNS resolution, a higher priority than the DNS server
/ Etc / hostname CentOS 7 hostname configuration file
/ Etc / fstab automatic loading device power profile, the first profile 0 indicates that no backup, the second disk boot does not represent 0 POST
/ Etc / mtab list of currently mounted file system, the initialization scripts, use the mount, mtab file will be updated immediately umount command, use the df command to view mtab file information
/etc/rc.local file storage boot from the start program commands, (chkconfig can only manage yum / rpm installation package to start the service)
/ Etc / inittab to set the system boot init process will set the system to what runlevel and load settings related to the startup file
/etc/init.d storage system or server startup script to System V mode
Environment Variables / etc / profile to configure the system, such as an alias files, configure a variety of permanent, effective need to log in again, or (source /etc/profile,./etc/bashrc)
Environment Variables / etc / bashrc configuration system aliases file, various permanent configurations take effect need to log in again, or (source /etc/profile,./etc/bashrc)
Former user logs / etc / issue system startup, login page prompts profile information
Former user logs /etc/issue.net system startup, login page prompts profile information
After the / etc / motd account login pop-up login prompt, you can configure a banner
/etc/sysctl.conf Linux kernel parameter settings file for the kernel configuration and optimization
/etc/init.d directory of software startup program is located (CentOS 7 previously), has been basically abandoned
/ Etc / inittab run level system settings, and files (CentOS 7 previously) to start the appropriate level of the script, now largely abandoned
/ Etc / redhat-release statement RedHat, CentOS version, ubuntu is / etc / lsb-release, oracle linux is / etc / oracle-release
/ Etc / group name of the group and the user setting information
/ Etc / passwd file account information
/ Etc / shadow password file information
/etc/yum.repos.d/ storage yum source profile directory