/etc/fstab

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本文详细解析了Linux系统中fstab文件的作用、组成部分及其关键配置项，帮助理解如何管理设备挂载。

[root@hnl ~]# cat /etc/fstab


#
# /etc/fstab
# Created by anaconda on Sun Jan 29 14:11:48 2012
#
# 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
#
/dev/mapper/vg_hnl-lv_root /                       ext4    defaults         1 1
UUID=cc890fc9-a6a8-4c7c-8cc1-65f3f43037cb /boot            ext4
    defaults        1 2
/dev/mapper/vg_hnl-lv_home /home                   ext4    defaults         1 2
/dev/mapper/vg_hnl-lv_swap swap                    swap    defaults         0 0
tmpfs                   /dev/shm                tmpfs   defaults         0 0
devpts                  /dev/pts                devpts  gid=5,mode=620   0 0
sysfs                   /sys                    sysfs   defaults         0 0
proc                    /proc                   proc    defaults         0 0

The /etc/fstab file is used to mount two different kinds of devices: you can mount file systems and system devices. In Listing 5.8, the first four lines are used to mount file systems, and the last four lines are used to mount specific system devices.

To specify how the mounts should be performed, six different columns are used:

The name of the device to be mounted.
The directory where this device should be mounted.
The file system that should be used to mount the device.
Specific mount options: use defaults if you want to perform the mount without any specific options.
Dump support: use 1 if you want the dump backup utility to be able to make a backup of this device, and use 0 if you don't. It's good practice to enable dump support for all real file systems.
fsck support: use 0 if you never want this file system to be checked automatically while booting. Use 1 for the root file system. This ensures that it will be checked before anything else takes place. Use 2 for all other file systems.