Linux Basics-23, File system Management

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Re-creating the file system will damage the original file

Mkfs:make File System

-T

Mkfs-t ext2 =mkfs.ext2

Mkfs-t ext3 =MKFS.EXT3

Mkfs-t Ext4 =MKFS.EXT4

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File system type

Ext2

Ext3

Ext4

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To view the file system types supported by the current kernel

[Email protected] ~]# Cat/proc/filesystems

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Specially managed ext System file System

Mke2fs

-j: Creating a ext3 Type file system

-B: Specify block size, default 4096, support 1024 2048 4096

-L Label: Specifies the partition volume label

-M #: Percentage of blocks assigned to super users

-I #: Specify how many bytes of space, default 8196, given the number should be greater than the block size of 2^n times

-N #: Specify Inode Count

-F: Force file system creation

-E: User-specified additional file system properties

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Blkid: Querying related properties of disk devices

[Email protected] ~]# Blkid

/dev/sda2:uuid= "1012c420-a3f3-49df-96ec-8342d49d29f6" type= "Ext4"

/dev/sda1:uuid= "C572a53a-3098-4086-a32b-21e616343a99" type= "Ext4"

/dev/sda3:uuid= "4e29d3a8-7004-446b-b693-1f124848aa82" type= "Ext4"

/dev/sda5:uuid= "E01b088a-20f1-4ae5-a9e4-b72d0cb97eab" type= "Ext4"

/dev/sda6:uuid= "A65c442f-2a9e-407e-8422-1192e08b85ee" type= "swap

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E2label: Used to view or define volume labels

E2label device File Volume Label: Set Volume label

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TUNE2FS: Adjusting the file system's related properties

-J: ext2 upgrade to ext3 without compromising the original data

-L Label: set or modify volume label

-M #: adjust reserve percentage

-R #: Specifies the number of blocks reserved

-O: Set default mount Options

Acl

-C #: Specifies that the mount count reaches # times after self-test, 0 or 1 means turn off this feature

-I #: a self-test with a number of days after each mount, 0 or 1 means to turn off this feature

-L: Show information in super fast

[Email protected] ~]# tune2fs-l/DEV/SDA5

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DUMPE2FS: Displaying File System Properties

[Email protected] ~]# DUMPE2FS/DEV/SDA5

-H: Show only Super block information

[Email protected] ~]# dumpe2fs-h/DEV/SDA5

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Fsck: Checking and repairing the Linux file system

-T: Specify File system type

-A: Automatic repair

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E2FSCK: Dedicated to repairing Ext2/ext3 file system

-F: Forced check

-P: Automatic repair

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Mount: Associate a new file system to the current root file system

Uninstall: Remove the association of a file system from the current root file system

Mount: Mount device

Usage

Umount: Device mount point

Equipment

Device file:/dev/sda5

Volume Label: label= ""

Uuid:uuid= ""

mount point: Directory

Requirements: 1, this directory exists, 2, this directory is not used by other processes, 3, the original files in the directory will be temporarily hidden

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Displays the current mount

[email protected] ~]# mount

/dev/sda2 on/type ext4 (rw)

Proc On/proc type proc (rw)

Sysfs On/sys type SYSFS (rw)

Devpts on/dev/pts type devpts (rw,gid=5,mode=620)

Tmpfs on/dev/shm type Tmpfs (rw,rootcontext= "System_u:object_r:tmpfs_t:s0")

/DEV/SDA1 on/boot type EXT4 (rw)

/dev/sda3 on/home type EXT4 (rw)

/dev/sda5 on/tmp type EXT4 (rw)

None On/proc/sys/fs/binfmt_misc type Binfmt_misc (rw)

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mount [Options] [-0 options]

-A: Mount all file systems defined in the/etc/fstab file

-N: Use-n does not write information to the/etc/mtab file

-T Type: Specifies the file system type on the device being mounted, and without this option, Monut invokes the file system type of the Blkid command

-R: Read-only mount, common Mount discs

-W: Read-write Mount

-O: Specify additional mount options, which specify the properties of the file system startup

Remount: Re-mount the current file system

RO: Mount as read-only

RW: Read-write Mount

When the mount is complete, the files on the corresponding file system are accessed via the mount point

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Umount: Uninstalling a file system

Umount Equipment | | Mount point

Uninstallation considerations: Mounted devices are not in process use

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[Email protected] ~]# free-m

Total used free shared buffers Cached

mem:1869 608 1260 0 170 195

-/+ buffers/cache:242 1626

swap:255 0 255

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Create swap partition

Mkswap/dev/sda8

-L Label

Swapon/dev/sda8

Swapoff/dev/sda8

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Loopback devices

Loopback using software to emulate hardware

Create an image file

DD Command:

if= Data sources

of= Data storage target

Bs=1

conut=2

This article is from the "James Zhan Linux Advanced ops" blog, so be sure to keep this source http://jameszhan.blog.51cto.com/10980469/1878255

Linux Basics-23, File system Management