Linux System Management-(2)--disk mount and unload

What is mounted:

The additional file system is associated with an existing directory of the root file system, so that the directory as the other file access entry behavior is called mount;

What is uninstall:

The process of releasing this association is called unloading;

Note: The existing files under the mount point will be temporarily hidden after the mount is completed;

Mount Method: Mount DEVICE mount_point
Mount: Displays all devices that are currently mounted on the system by viewing the/etc/mtab file
Mount [-FNRSVW] [-t vfstype] [-O options] Device dir
Device: Indicate the equipment to be mounted;
(1) device files: e.g./dev/sda5
(2) Label:-L ' LABEL ', e.g.-l ' MYDATA '
(3) UUID,-u ' uuid ': for example-U ' 0c50523c-43f1-45e7-85c0-a126711d406e '
(4) Pseudo file system name: Proc, SYSFS, Devtmpfs, Configfs
Dir: Mount point
Pre-existing; Recommended use of empty directories;
The device that the process is in use cannot be uninstalled;

Common Command options:
-T Vsftype: Specifies the type of file system on the device you want to mount;
-r:readonly, read-only mount;
-w:read and write, read-write Mount;
-N: Do not update/etc/mtab;
-A: Automatically mounts all devices that support automatic mounts, (defined in the/etc/fstab file, and the Mount option has "Auto mount" function)
-L ' LABEL ': Specifies the mounting device by volume label;
-U ' UUID ': Specifies the device to be mounted with the UUID;
-B,--bind: Bind directory to another directory;

Note: View all mounted devices tracked by the kernel: cat/proc/mounts

-O options: (option to mount file system)
Async: Asynchronous mode;
Sync: synchronous mode;
Atime/noatime: Contains directories and files;
Diratime/nodiratime: Access timestamp for directory
Auto/noauto: Whether auto mount is supported
Exec/noexec: Whether to support running applications on the file system as a process
Dev/nodev: Whether to support the use of device files on this file system;
Suid/nosuid:
Remount: Re-mount
Ro:
rw
User/nouser: Whether to allow normal users to mount this device
ACL: Enable the ACL feature on this file system

Note: The above options can be used in multiple simultaneous use, separated from each other by commas;
Default mount options: Defaults

RW, suid, dev, exec, auto, Nouser, and Async

Uninstall command:
# Umount DEVICE #通过目录卸载
# Umount Mount_point #通过挂载点卸载

to view the process that is accessing the specified file system:
# fuser-v Mount_point

Terminates all processes that are accessing the specified file system:
# fuser-km Mount_point

mount Swap partition:
Enabled: Swapon
Swapon [OPTION] ... [DEVICE]
-A: Activates all swap partitions;
-P Priority: Specify the precedence;
Disabled: Swapoff [OPTION] ... [DEVICE]

Memory space usage Status:
free [OPTION]
-M: in megabytes
-G: in gigabytes

viewing tools For information such as file system space usage:
Df:
-h:human-readable
-i:inodes instead of blocks
-P: Output in POSIX compatible format;

To view the overall space consumption status of a directory:
Du
Du [OPTION] ... DIR
-h:human-readable

-s:summary

File Mount Profile:/etc/fstab

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defines a file system to mount for each row;

Device or pseudo file system      mount point to Mount      File system types       mount options      Dump frequency       self-Test order

Device or pseudo-file system to mount:

Device file, LABEL (label= "), UUID (uuid=" "), pseudo file system name (proc, SYSFS)

Mount Options:
Defaults

Dump frequency:
0: Do not make a backup
1: Daily dumps
2: Dump every other day

Self-Test order:
0: No self-test
1-9: Priority self-test; usually only rootfs is used 1;

Linux System Management-(2)--disk mount and unload