Change Unix rights of /var/lib/ceph/{osd, mon}/$cluster-$id/ directories on Infernalis?

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Hi,

I have a ceph cluster on Infernalis and I'm using a snmp agent to retrieve
data and generate generic graphs concerning each cluster node. Currently, I
can see in the syslog of each node this kind of lines (every 5 minutes):

    Mar 11 03:15:26 ceph01 snmpd[16824]: Cannot statfs /var/lib/ceph/mon/ceph-ceph01#012: Permission denied
    Mar 11 03:15:26 ceph01 snmpd[16824]: Cannot statfs /var/lib/ceph/osd/ceph-16#012: Permission denied

Of course, it's a basic problem of Unix rights. The snmp agent uses the
account "snmp" and the Unix rights of the ceph home directory are:

    ~# ll -d /var/lib/ceph
    drwxr-x--- 9 ceph ceph 4096 Nov  4 06:34 /var/lib/ceph/

So, of course, currently the snmp account can't access to
/var/lib/ceph/{osd,mon}/$cluster-$id/.

1. Is there a problem (an eventually side effect) if I just do that?

    chmod o+rx /var/lib/ceph/

Can I have security problem with that?


2. Or do you think it's a better idea to just add "snmp" in the Unix group
"ceph"? Maybe better than 1. because I don't change the permissions of the
directory _and_ it seems to me that a member of the "ceph" group has never
the "w" right in /var/lib/ceph/.

Thanks in advance for your help.

-- 
François Lafont
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