Introduction to Linux Rights Management--acl permissions

ACL permissions are not for a file or a directory, it is for a partition.

viewing system partitions using DF-H

1[Email protected] ~]$DF-h2Filesystem Size used Avail use%mounted on3/dev/sda3 16G2.9G 12G -% /4Tmpfs 947M0947M0%/dev/SHM5/DEV/SDA1 291M 35M 242M -% /Boot6/dev/sr03.0G3.0G0  -%/media/cdrom

The partition number you can see is/dev/sda3, to see if/dev/sda3 supports ACL permissions
Use the command DUMPE2FS to see if ACLs are supported

1[Email protected] ~]# dumpe2fs-h/dev/Sda32Dumpe2fs1.41. A( --may- .)3Filesystem Volume Name: <none>4Last mounted on:/5Filesystem uuid:4e32f639-ccc9-4942-ac35-b281fdfbb79e6Filesystem Magic Number:0xef537Filesystem Revision #:1(dynamic)8 Filesystem features:has_journal ext_attr resize_inode dir_index filetype needs_recovery extent FLEX_BG Sparse_su Per large_file huge_file uninit_bg dir_nlink extra_isize9 Filesystem Flags:signed_directory_hashTenDefaultMountoptions:user_xattr ACL One Filesystem State:clean AErrors behavior:continue

You can see that the default Mount options item is an ACL-enabled

The general operating system supports ACL permissions by default. If you do not support ALC permissions that enable partitioning
Re-mount/partition with the mount command and support ACL permissions

1 Mount -o remount,acl/

Re-mount with mount command and support ACL permissions are only temporary and fail after system restart

1[Email protected] ~]# vim/etc/Fstab2 3   1 4   2 #5   3#/etc/Fstab6   4# Created by Anaconda in Sun May1  the: +: .  .7   5 #8   6# Accessible filesystems, by reference, is maintained under'/dev/disk'9   7# SeeMansPages Fstab (5), Findfs (8),Mount(8) and/or Blkid (8) for  More InfoTen   8 # One   9uuid=4e32f639-ccc9-4942-AC35-B281FDFBB79E/EXT4 defaults1 1 A  TenUuid=7e2ce555-c044-41f8-9cd5-18c7d5293cf1/boot EXT4 Defaults1 2 -   Oneuuid=fa77a5dd-1f7f-4428-bcc4-79f7742ed320 Swap swap Defaults0 0

The default is to support ACL permissions, if not supported by default, we can add the ACL option after the corresponding partition, as shown below, with/partition as an example

1 9 uuid=4e32f639-ccc9-4942-ac35-b281fdfbb79e/                       ext4    defaults,acl        11 

Introduction to Linux Rights Management--acl permissions