set device mode permanently with udev rule


 
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Operating Systems Linux Red Hat set device mode permanently with udev rule
# 1  
Old 11-17-2011
set device mode permanently with udev rule

On a test server running CentOS 6, I try to permanently set the owner, group and mode of disk devices for use with a DB2 database. For this I created an udev rule file /etc/udev/rules.d/99-db2.rules:
Code:
KERNEL=="sdb[1-9]*", OWNER="db2usrl1", GROUP="db2adml1", MODE="0600"

After a reboot, the owner and group of all sdb* devices is correct, but the device mode stays 0660. As far as I can tell there is no error message.

When I try udevadm trigger, the same happens. For demonstration, I set owner, group and mode of a device, then run udevadm trigger and finally look at the result:
Code:
# chown 0:0 /dev/sdb21
# chmod 666 /dev/sdb21
# ls -l /dev/sdb21
brw-rw-rw-. 1 root root 259, 5 Nov 17 14:22 /dev/sdb21
# udevadm trigger
# ls -l /dev/sdb21
brw-rw----. 1 db2usrl1 db2adml1 259, 5 Nov 17 14:22 /dev/sdb21

Is this a bug or am I missing something?
# 2  
Old 11-17-2011
Make sure that your rule is the one being run last. Other rules may be running after yours and overriding their settings.
# 3  
Old 11-18-2011
As far as I can tell it is the last rule, at least it is the last file in /etc/udev/rules.d.

I also tried to run udevadm test for this device, and if I understand the output correctly, it claims to set the mode to 0600.

Code:
# udevadm test /class/block/sdb21
...
udev_rules_apply_to_event: OWNER 1201 /etc/udev/rules.d/99-db2.rules:2
udev_rules_apply_to_event: GROUP 1201 /etc/udev/rules.d/99-db2.rules:2
udev_rules_apply_to_event: MODE 0600 /etc/udev/rules.d/99-db2.rules:2
...

Any suggestions?
# 4  
Old 11-24-2011
Enter your settings in /etc/rc.local
Code:
 /bin/chown root:dba /dev/raw/raw1
  /bin/chown oracle:dba /dev/raw/raw2
  
  # temp solution until good udev rules are found
  /bin/chown oracle:dba /dev/mapper/arch*
  /bin/chown oracle:dba /dev/mapper/dbs*
  /bin/chown oracle:dba /dev/mapper/redo*
  /bin/chown oracle:dba /dev/mapper/undo*

# 5  
Old 03-15-2012
In the meanwhile I found out, that setting the group of the device to "root" instead of "db2usrl1" makes the udev rule work as expected. The device mode is correctly set to 0600.

But changing the group back to anything else but "root" and ... peng ... the device mode goes back to 0660.

When you want NO access for a group, it doesn't really matter, which group it is, that has no access. So I can live with this. But I still wonder, what might cause this behaviour. The word "bug" comes to mind. Or is there something I do not get?
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