File System Support: Difference between revisions
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Revision as of 18:07, 24 August 2015
To use the advanced features of Samba, you need a filesystem that supports both the "user" and "system" xattr namespace. You need this support on file systems that you will share through Samba.
For Samba Active Directory Domain Controllers, „samba-tool“ tests during the provisioning the xattr support for /usr/local/samba/var/locks/sysvol/.
ext4
fstab
For filesystems of that type shared by Samba, add the following options to your /etc/fstab:
/dev/... /srv/samba/demo ext4 defaults,barrier=1 1 1
Note: The „barrier=1“ option ensures that tdb transactions are safe against unexpected power loss.
Please be careful modifying your fstab. It can lead into an unbootable system!
Kernel support
Ensure that your kernel has the following options enabled:
CONFIG_EXT4_FS_XATTR=y CONFIG_EXT4_FS_SECURITY=y CONFIG_EXT4_FS_POSIX_ACL=y
ext3
fstab
For filesystems of that type shared by Samba, add the following options to your /etc/fstab:
/dev/... /srv/samba/demo ext3 user_xattr,acl,barrier=1 1 1
Note: The „barrier=1“ option ensures that tdb transactions are safe against unexpected power loss.
Please be careful modifying your fstab. It can lead into an unbootable system!
Kernel support
Ensure that your kernel has the following options enabled:
CONFIG_EXT3_FS_XATTR=y CONFIG_EXT3_FS_SECURITY=y CONFIG_EXT3_FS_POSIX_ACL=y
XFS
fstab
No special mount options are required in your fstab.
Kernel support
Ensure that your kernel has the following options enabled:
CONFIG_XFS_POSIX_ACL=y
File systems without xattr support
Note: This is not recommended!!!
If you don't have a filesystem with xattr support, you can simulate it by adding the following line to your smb.conf:
posix:eadb = /usr/local/samba/private/eadb.tdb
This will place all extra file attributes (NT ACLs, DOS EAs, streams, etc), in that tdb.
Note: This way it is not efficient and doesn't scale well. That's why it shouldn't be used in production!
Testing your filesystem
Note: This is not required for file systems without xattr support.
Before you start testing, ensure, that you have the „attr“ package installed!
Run the following commands as root to test xattr support:
# touch test.txt # setfattr -n user.test -v test test.txt # setfattr -n security.test -v test2 test.txt
The following commands should return the shown output:
# getfattr -d test.txt # file: test.txt user.test="test" # getfattr -n security.test -d test.txt # file: test.txt security.test="test2"
Run the following commands as root to test extended ACL support:
# touch test.txt # setfacl -m g:adm:rwx test.txt
The following command should return the shown output:
# getfacl test.txt # file: test.txt # owner: root # group: root user::rw- group::r-- group:adm:rwx mask::rwx other::r--
Note: Getting an "Operation not supported" error means your kernel is not configured correctly or your filesystem is not mounted with the correct options.
Note: Getting an "Operation not permitted" error means you didn't run the commands as user „root“.