Talk about important subdirectory issues in Linux system

/etc/fstab

Automatically mount partitions/disks, specify which partition/device to mount to

 [root@oldboy ~]# cat /etc/fstab
#
# /etc/fstab
# Created by anaconda on Sun Aug 12 17:26:53 2018
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=c9b74b1a-41cd-4260-9444-6245ab833dd9 / ext4 defaults 1 1
UUID=8880df83-5bf8-40db-bf6f-bf878b7a7e2e /boot ext4 defaults 1 2
UUID=3144b92b-c079-4239-9a91-84111d2f1ac1 swap swap defaults 0 0
tmpfs //To mount the device /dev/shm //Mount point tmpfs //File system type defaults //Mount on option 0 //Whether to back up 0 //Whether to do a power-on self-check devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0

/etc/resolv.conf

DNS Temporary Configuration File

[root@oldboy ~]# cat /etc/resolv.conf 
; generated by /sbin/dhclient-script
search localdomain
nameserver 192.168.182.2
[root@oldboy ~]# vi /etc/resolv.conf 
; generated by /sbin/dhclient-script
search localdomain
nameserver 192.168.182.2
nameserver 8.8.8.8
~                                        
~                                                                              
~                                        
~                                        
"/etc/resolv.conf" 4L, 100C written
[root@oldboy ~]# cat /etc/resolv.conf 
; generated by /sbin/dhclient-script
search localdomain
nameserver 192.168.182.2
nameserver 8.8.8.8

/etc/hosts

Hostname resolution file:

The hosts file stores the correspondence between IP addresses and domain names

effect:

• Used by developers, product developers, testers, etc. to test products through official domain names
• Server calls can be made using domain names (internal DNS) for easy migration

[root@oldboy ~]# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

/etc/sysconfig/nework

[root@study ~]# cat /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=study //Host name

Modify the host name

•vim /etc/sysconfig/network
•sed -i 's#HOSTNAME=study#HOSTNAME=centos#g' /etc/sysconfig/network

/etc/rc.local

Files where the startup program commands are stored (chkconfig is often used to manage the automatic startup of program services installed by yum/rmp)

/etc/inittab

Runlevel configuration files

/etc/issue

Login prompt configuration file

[root@study ~]# cat /etc/issue
CentOS release 6.7 (Final)
Kernel \r on an \m

/var/log/messages

System information log file

PS: Let's look at the Linux subdirectory below

lost+found stores repaired or damaged files
misc miscellaneous equipment
net command line commands
proc An image of all running processes
tmp Temporary files that disappear after each reboot
var extracts the files that need to be changed during the operation of the usr directory or the temporarily generated files and directories, so that the usr directory can be mounted as read-only.
boot
The kernel and the files needed to load the kernel
media
Mainly interact with SessionManager to perform multimedia playback, pause and other operations
mnt
The directory of the mounted CD-ROM drive and USB device will have a corresponding device directory in mnt after loading.
opt : optional application installation package
Implementation of selinux mandatory access directory
sys system replication

Summarize

The above are the important subdirectories of the Linux system introduced by the editor. I hope it will be helpful to everyone. If you have any questions, please leave me a message and the editor will reply to you in time. I would also like to thank everyone for their support of the 123WORDPRESS.COM website!