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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