7.8 Enabling SNMP Server Monitoring

For troubleshooting or hardware monitoring, it may be useful to enable SNMP on the servers in your Oracle Private Cloud Appliance. While the tools for SNMP are available, the protocol is not enabled by default. This section explains how to enable SNMP with the standard Oracle Linux and additional Oracle Private Cloud Appliance Management Information Bases (MIBs).

Enabling SNMP on the Management Nodes

Using SSH and an account with superuser privileges, log into the management node.
Note
The data center IP address used in this procedure is an example.
```
# ssh root@10.100.1.101
root@10.100.1.101's password:
[root@ovcamn05r1 ~]#
```
Locate the necessary rpm packages in the mounted directory /nfs/shared_storage/mgmt_image/Packages, which resides in the MGMT_ROOT file system on the ZFS storage appliance. The following packages are part of the Oracle Private Cloud Appliance ISO image:
- net-snmp-5.5-60.0.1.el6.x86_64.rpm
- net-snmp-libs-5.5-60.0.1.el6.x86_64.rpm
- net-snmp-utils-5.5-60.0.1.el6.x86_64.rpm
- ovca-snmp-0.9-3.el6.x86_64.rpm
- lm_sensors-libs-3.1.1-17.el6.x86_64.rpm

Install these packages by running the following command:

# rpm -ivh ovca-snmp-0.9-3.el6.x86_64.rpm net-snmp-libs-5.5-49.0.1.el6.x86_64.rpm \
net-snmp-5.5-49.0.1.el6.x86_64.rpm lm_sensors-libs-3.1.1-17.el6.x86_64.rpm \
net-snmp-utils-5.5-49.0.1.el6.x86_64.rpm

Create an SNMP configuration file: /etc/snmp/snmpd.conf.
This is a standard sample configuration:
```
rocommunity public
syslocation MyDataCenter
dlmod ovca /usr/lib64/ovca-snmp/ovca.so
```
Enable the snmpd service.
```
# service snmpd start
```
If desired, enable the snmpd service on boot.
```
# chkconfig snmpd on
```

Open the SNMP ports on the firewall.

# iptables -I INPUT -p udp -m udp --dport 161 -j ACCEPT
# iptables -I INPUT -p udp -m udp --dport 162 -j ACCEPT
# iptables-save > /etc/sysconfig/iptables

SNMP is now ready for use on this management node. Besides the standard Oracle Linux MIBs, these are also available:

ORACLE-OVCA-MIB::ovcaVersion
ORACLE-OVCA-MIB::ovcaSerial
ORACLE-OVCA-MIB::ovcaType
ORACLE-OVCA-MIB::ovcaStatus
ORACLE-OVCA-MIB::nodeTable

Usage examples:

# snmpwalk  -v 1 -c public -O e 130.35.70.186 ORACLE-OVCA-MIB::ovcaVersion
# snmpwalk  -v 1 -c public -O e 130.35.70.111 ORACLE-OVCA-MIB::ovcaStatus
# snmpwalk  -v 1 -c public -O e 130.35.70.111 ORACLE-OVCA-MIB::nodeTable

Repeat this procedure on the second management node.

Enabling SNMP on the Compute Nodes

Note

On Oracle Private Cloud Appliance compute nodes, net-snmp, net-snmp-utils and net-snmp-libs are already installed at the factory, but the SNMP service is not enabled or configured.

Using SSH and an account with superuser privileges, log into the compute node. It can be accessed through the appliance internal management network.
```
ssh root@192.168.4.5
root@192.168.4.5's password:
[root@ovcacn27r1 ~]#
```
Create an SNMP configuration file: /etc/snmp/snmpd.conf and make sure this line is included:
```
rocommunity public
```
Enable the snmpd service.
```
# service snmpd start
```
SNMP is now ready for use on this compute node.
If desired, enable the snmpd service on boot.
```
# chkconfig snmpd on
```
Repeat this procedure on all other compute nodes installed in your Oracle Private Cloud Appliance environment.