File role
Avoid manually remounting the disk partition every time after booting. This file will be read when the system is started and mounted according to the configuration content
Mounting considerations
- The root file system must be mounted first
- Mount point must exist
- Mount device and mount point can only be mounted once at the same time
File content interpretation
[root@master ~]# cat /etc/fstab # # /etc/fstab # Created by anaconda on Sat Jun 29 08:50:28 2019 # # 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 # UUID=0bbd5e50-606c-4c47-8cd7-1ae67f812437 / xfs defaults 0 0 UUID=bba2c917-8540-41c8-97e6-f1d73d9143ba /boot xfs defaults 0 0 UUID=1c0f8351-49f0-4dd8-9a8b-1aff1d4a77b0 swap swap defaults 0 0 UUID=6cfbe843-e280-4d85-9ae3-60b0ebcc5909 /data xfs defaults 0 0
The first column is the mounted device
Can be the device name or UUID or label
Use the blkid command to view the UUID and device name
[root@master ~]# blkid /dev/sda3 /dev/sda3: UUID="0bbd5e50-606c-4c47-8cd7-1ae67f812437" TYPE="xfs"
Note: the difference between mounting using device name and UUID
When using the device name ( / dev / sda) to mount the partition, it is fixed. Once the order of the disk slots changes, there will be a problem that the names do not correspond. Because the name will change. If you use uuid to mount, you do n’t have to worry about messing up.
The second column is the mount point
Is the directory that provides access to the device
The third column is the mount type
Common file system types are: ext2-4, xfs nfs
The fourth column is the mounting parameters
| Async/sync |
Set whether to run in synchronous mode, the default is async |
| auto / noauto |
When downloading the mount -a command, is this file system actively mounted? The default is auto |
| rw/ro |
Whether to mount in read-only or read-write mode |
| exec/noexec |
Whether the restriction can be performed within this file system " execution " of operations |
| user/nouser |
Whether to allow users to mount using the mount command |
| south / north |
Whether to allow the existence of SUID |
| Usrquota |
The boot file system supports disk quota mode |
| Grpquota |
Enable file system support for group disk quota mode |
| Defaults |
Colleagues have settings for default parameters such as rw , suid, dev, exec, auto, nouser, async, etc. |
The parameter noatime can be optimized. When the defaults parameter is used, the time stamp is recorded when the file is accessed, created, or modified. For applications that require throughput, it is best to add this parameter, which will significantly improve I / O efficiency.
The fifth column is whether to backup
| 0 |
Do not make dump backup |
| 1 |
On behalf of the daily dump operation |
| 2 |
On behalf of the date of the dump operation |
The sixth column is whether to perform disk test
| 0 |
Don't test |
| 1 |
The earliest inspection (general root directory will be selected) |
| 2 |
Carry out inspection after completion of level 1 inspection |