Re: Hardware Asset Information

On 4 October 2011 23:37, Kaushal Shriyan <[email protected]> wrote:
> root@host0129:/etc/snmp# snmpwalk -v 2c -c local localhost
> nsExtendOutput1Line."dmi" = STRING: /dev/mem: Permission denied

That looks as if the SNMP agent can't read the necessary information
from the kernel.



> root@host0129:/etc/snmp# ps aux|grep snmpd
> snmp      6785  0.0  0.0  42024  5168 ?        S    15:29   0:00 /usr/sbin/snmpd

The agent is clearly running as a special dedicated user "snmp".
Presumably this user doesn't have permission to read /dev/mem

> /usr/sbin/snmpd -Lsd -Lf /dev/null -u snmp -I -smux -p
>         /var/run/snmpd.pid -c /etc/snmp/snmpd.conf

And this user is being set explicitly   ('-u snmp')



> Please suggest further

Three options:
    -  run the agent as root, rather than 'snmp'
    -  make the permissions on /dev/mem globally readable

    -  run the agent in a suitable group

You haven't said what O/S you are using, or what the
permissions on /dev/mem actually are.
But on my system,

    $ ls -l /dev/mem
crw-r-----. 1 root kmem 1, 1 Sep 15 10:48 /dev/mem

so running the agent in the group 'kmem' ought to work.
Try adding the option "-g kmem" to the startup incantation,
and restart the agent.

(Obviously, if your /dev/kmem settings are different, you
should use the appropriate group instead)

Dave

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