Chapter 8 disk Operation-centos7.5 knowledge
1. Disk marking
Under Windows FAT32 partition, you can store a single file up to 4G.
II. Partition operation
fdisk command
View or manage disk partitions
fdisk -l [disk device]
or
fdisk [disk device]
Common commands in interactive mode
m、p、n、d、t、w、q
Make Filesystem, Create File System (Format)
mkfs -t file system type partition device
As a front end tool for several other partition commands,
By "-t... "option specifies file system type
or
mkfs.btrfs mkfs.cramfs mkfs.ext2 mkfs.ext3 mkfs.ext4 mkfs.fat mkfs.minix mkfs.msdos mkfs.vfat mkfs.xfs
Mount or unmount file systems
Mount command
Display mounted devices
Mount Device Name Mount Point
Mount file system, ISO image to specified folder
mount [ -t type] Storage device mount point directory
mount -o loop ISO image file mount point directory
example
Mkdir /mnt/mount directory
mkdir /mnt/sdf1disk15g
mount /dev/sdf1 /mnt/sdf1disk15g/
df -h
mount
umount command
Unmount mounted file systems
umount Storage device location
mount mount point directory
Note: Unloaded equipment cannot be in use. How to do it: check that the task is completed and enter cd command.
mkswap command
make swap to create a swap file system
mkswap partition device
free -m View cache size
[root@localhost ~]# mkswap /dev/sdb5
Setting up swapspace version 1, size = 2097148 KiB
no label, UUID=9673550e-9dfd-4fa8-8683-255680230f10
[root@localhost ~]# cat /proc/meminfo | grep SwapTotal
SwapTotal: 8257532 kB
[root@localhost ~]# swapon /dev/sdb5
Views
[root@localhost ~]# cat /proc/meminfo | grep SwapTotal
or free -m
SwapTotal: 10354680 kB
[root@localhost ~]# swapoff /dev/sdb5
-----------
Solve permanent mount problem
DF command
df [options] [files]
[root@localhost ~]# df -hT
File System Type Capacity Used Available % Mount Point Used
/dev/mapper/VolGroup-Lv_root ext4 6.7G 4.1G 2.3G 65% /
/dev/sda1 ext4 99M 11M 83M 12% /boot
tmpfs tmpfs 252M 0 252M 0% /dev/sdb1 ext4 19G 173M 18G 1%
Assignment:
1. Enter the meanings of "w" and "q" in the fdisk environment.
What is the sequence of actions in the fdisk environment to create a 20GB primary partition?
