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mnology
Asked: 2008-10-10 08:33:07 +0800 CST

How to change device permissions via udev in RHEL5?

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I'm attempting to make the device permissions on a hard drive(/dev/sdb) persistent for a particular group in RHEL5. Can anyone point me to to a proper KERNEL line in /etc/udev/rules that would work that attempts the following?

KERNEL=="sdb", NAME="%k", GROUP="group", MODE="666", OPTIONS="last_rule"
permissions rhel5 udev device

1 Answers

  1. Best Answer

    That rule looks good.

    Have you put it in a file in /etc/udev/rules.d before 50-udev.rules? Then did you reboot or run /sbin/udevcontrol reload_rules and then udevtrigger?

    You can test it like so: udevtest /block/sdb

    Edit: Here is an example that worked for me. In /etc/udev/rules.d/10-local.rules:

    KERNEL=="ttyS0", NAME="%k", GROUP="adm", MODE="666", OPTIONS="last_rule"

    Ran udevcontrol reload_rules then udevtrigger --verbose. Result:

    crw-rw-rw- 1 root adm 4, 64 Oct 18 16:16 /dev/ttyS0

    Test:

    # udevtest /class/tty/ttyS0
main: looking at device '/class/tty/ttyS0' from subsystem 'tty'
...
udev_node_add: creating device node '/dev/ttyS0', major = '4', minor = '64', mode = '0666', uid = '0', gid = '4'

    Edit2: Also you can run udevcontrol log_priority=debug to get more info reported via syslog.

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