[TOC]
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# mount
> An association between an additional file system and an existing directory of the root file system, which makes this directory a gateway for other file access is called mount
# # # Mount Method Mount
"' Mount DEVICE mount_pointMount: Displays all devices that are currently mounted on the system by viewing the/etc/mtab fileMount [-FNRSVW] [-t vfstype] [-O options] Device dirDevice: 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, ConfigfsDir: Mount pointPre-existing; Recommended use of empty directories;The device that the process is in use cannot be uninstalled;
Common Command options:-T Vsftype: Specifies the file system type on the device to be mounted, which can be called without specifying the BLKID call-r:readonly, read-only mount;-w:read and write, read-write Mount;-N: Do not update/etc/mtab; file mount, uninstall the file is updated by default. The Mount command, which invokes the file display. However, the kernel can view the mount through/proc/mounts. So the mount display is not necessarily the most accurate.-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 the file system) is preceded by a command option followed by an attribute option that is enabled or disabled by the file system.Async: Asynchronous mode;Sync: synchronous mode;Atime/noatime: A timestamp containing directories and filesDiratime/nodiratime: Access timestamp for directoryAuto/noauto: Whether auto mount is supportedExec/noexec: Whether to support running applications on the file system as a processDev/nodev: Whether to support the use of device files on this file system;Suid/nosuid:Remount: Re-mount, Mount-o Remount,ro/mydata, re-mount, set to RORO: Read-onlyRW: Read and WriteUser/nouser: Whether to allow normal users to mount this deviceACL: Enable the ACL feature on this file system (Access control list, centos6 default off, centos default on)
Note: The above options can be used in multiple simultaneous use, separated from each other by commas;Default mount options: DefaultsRW, suid, dev, exec, auto, Nouser, and Async "
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# Uninstall
> The process of releasing this association is called unloading
# # # Uninstall Command umount
"' Unload command:# Umount DEVICE# Umount Mount_point
To view the process that is accessing the specified file system:# fuser-v Mount_point
[Email protected] ~]# mount/dev/sdb9/tmp[[email protected] ~]# Umount/tmpumount:/tmp:device is busy. (In some cases useful info about processes, use the device are found by lsof (8) or fuser (1)) [[email protected] ~]# FUSER-V/tmp USER PID ACCESS command/tmp:root 579 7.. C.. bash
Terminates all processes that are accessing the specified file system:# fuser-km Mount_pointAdministrators have this permission
[Email protected] ~]# fuser-km/tmp/tmp:5797c[[email protected] ~]# umount/tmp
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# Mount Swap Partition
# # Swapon/swapoff
```Enabled: SwaponSwapon [OPTION] ... [DEVICE]-A: Activates all swap partitions;-P Priority: Specify the precedence;#如果有性能好的, set to high priority. or on different disks, load balancing, improve performance. The same disk is pseudo-balancedDisabled: Swapoff [OPTION] ... [DEVICE]Use free to view the space. Do not use it formally as much as necessary. ```
-----# Mount profile > File mount profile:/etc/fstab> each row defines a file system to mount, a file system other than the root, and a secondary system. The device or pseudo file system to mountMount pointFile system typeMount OptionsDump frequencySelf-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: (rarely used, with other tools, or scheduled Tasks)0: Do not make a backup1: Daily dumps2: Dump every other day
Self-Test order:0: No self-test1: First self-test, usually only rootfs 1;...Additional mounted data is not recommended for self-test and may be damaged. No dumps, either.
"> Add a record to the Fstab file to automatically mount the boot.
"[[email protected] ~]# Cat/etc/fstab
# #/etc/fstab# Created by Anaconda on Wed the 10:02:32 2016## Accessible filesystems, by reference, is maintained Unde R '/dev/disk ' # See mans Pages Fstab (5), Findfs (8), mount (8) and/or Blkid (8) for more info#uuid=a8c981b4-f953-430e-b4b4-769f 98f89f40/ EXT4 defaults 1 1uuid=76ed89c0-305c-45e9-aec2-7734ed87b1e3/boot &N Bsp EXT4 defaults 1 2UUID=348EFD32-74C9-444E-892B-B65DC0758EFC swap &NB Sp swap defaults 0 0tmpfs &nbs P /DEV/SHM  TM PFS Defaults 0 0devpts  /DE V/pts devpts gid=5,mode=620 0 0sysfs &NB Sp /sys  SYSFS Default S 0 0proc /proc &NB Sp proc defaults 0 0#/DEV/SDB1/mydataExt4Defaults0 0#/DEV/SDB6SwapSwapDefaults0 0#/DEV/SDB2/mysdb2Ext4Defaults0 0
```
From for notes (Wiz)
File System Management
