/etc/sysconfig/network-scripts/ifcfg-ens (redhat7)
/etc/sysconfig/network-scripts/eth (redhat6)
extension: select install when installing, press the tab key, enter net.ifnames=0 biosdevname=0 (change ens to eth in redhat7)

2.dns parsing file
/etc/resolv.conf

3.host file
/etc/hosts

4. Automatically mount the file
/etc/fstab at boot

5. System startup mode file
/etc/inittab

6. System startup script file
/etc/init.d

7. System global environment variable configuration path
/etc/profile

8. Account information file
/etc/passwd


9. The configuration file /etc/sudoers that executes the sudo command

10. Log file
/etc/syslog.conf (redhat5.x)
/etc/rsyslog.conf (after redhat6)