.::: .::: Additional OIS/MIB on Rhell/Redhat/Centos7 or Why SNMP is unable to query the interface, disk, memory, and CPU information in Red Hat Enterprise Linux? :::.

SNMP, or Simple Network Management Protocol, is widely used to communicate with and monitor network devices, servers, and more, all via IP. In this case, we’ll be installing an SNMP agent on a CentOS 6.5 server, which will allow for collection of data from our server, and make the information available to a remote SNMP manager.

1.    Make sure package net-snmp net-snmp-libs net-snmp-utils net-snmp-perl net-snmp-python
   # yum install net-snmp net-snmp-libs net-snmp-utils net-snmp-perl net-snmp-python
   # rpm -q net-snmp net-snmp-libs net-snmp-utils net-snmp-perl net-snmp-python
2.  Go to your product manufacturer and download the product's MIB & activation MIB/add MIB UCD-SNMP-MIB<cpu memory example>
3. Rename the mib to UCD-SNMP-MIB.txt
4. Copy the MIB inside /usr/share/snmp/mibs/
5.    Edit /etc/snmp/snmp.conf

[root@centos7 ~]# cat /etc/snmp/snmpd.conf | grep systemview
view    systemview    included   .1.3.6.1.2.1.1
view    systemview    included   .1.3.6.1.2.1.25
view    systemview    included   .1.3.6.1.2.1.2.2.1
view    systemview    included   .1.3.6.1.4.1.2021.10.1.3
view    systemview    included   .1.3.6.1.4.1.2021.11
view    systemview    included   .1.3.6.1.4.1.2021.4
view    systemview    included   .1.3.6.1.4.1.2021.9.1
view    systemview    included   .1
# Finally, grant the group read-only access to the systemview view.
access  notConfigGroup ""      any       noauth    exact  systemview none none
# Finally, grant the group read-only access to the systemview view.
[root@centos7 ~]#

6. enable snmp service
centos6
# /etc/init.d/snmpd start
# service snmpd start

centos7
systemctl start snmpd.service

7. check status snmp service
centos6
# /etc/init.d/snmpd status
# service snmpd status

centos7
systemctl status snmpd.service

8. enable Configure SNMP to start when the server boots:
centos6
# chkconfig snmpd on

centos7
systemctl enable snmpd.service

9. Run snmpwalk
# snmpwalk -v 2c -c public 127.0.0.1