Monday, 14 July 2014

Install SNMP Service on RHEL or CentOS


Install SNMP Service on RHEL or CentOS

In this article  we are going to learn  how to install and start  SNMP service in RHEL/CentOS.

We need  to have  net-snmp rpm package installed on the servers , generally it would come with repository.


1. Install net-snmp with yum:

#yum install net-snmp
[root@umserv]# yum install net-snmp
Loaded plugins: dellsysid, fastestmirror
Loading mirror speeds from cached hostfile
-----
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Dependencies Resolved

========================================================================================================================================================================
Package    Arch         Version          Repository        Size
========================================================================================================================================================================
Installing:
net-snmp     x86_64   1:5.3.2.2-22.el5_10.1    updates  708 k
Installing for dependencies:
 lm_sensors     x86_64  2.10.7-9.el5       base     525 k
Updating for dependencies:
 net-snmp-libs  i386    1:5.3.2.2-22.el5_10.1    updates  1.3 M
 net-snmp-libs  x86_64  1:5.3.2.2-22.el5_10.1    updates  1.3 M

Transaction Summary
========================================================================================================================================================================
Install      2 Package(s)
Update       2 Package(s)
Remove       0 Package(s)

Total download size: 3.8 M
Is this ok [y/N]: y
Downloading Packages:
(1/4): lm_sensors-2.10.7-9.el5.x86_64.rpm        | 525 kB     00:01
(2/4): net-snmp-5.3.2.2-22.el5_10.1.x86_64.rpm   | 708 kB     00:02
(3/4): net-snmp-libs-5.3.2.2-22.el5_10.1.i386.rpm      | 1.3 MB     00:04
(4/4): net-snmp-libs-5.3.2.2-22.el5_10.1.x86_64.rpm    | 1.3 MB     00:03
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total   168 kB/s | 3.8 MB     00:23
Running rpm_check_debug
Running Transaction Test

Finished Transaction Test
Transaction Test Succeeded
Running Transaction
----
----
Installed:
  net-snmp.x86_64 1:5.3.2.2-22.el5_10.1

Dependency Installed:
  lm_sensors.x86_64 0:2.10.7-9.el5

Dependency Updated:
  net-snmp-libs.i386 1:5.3.2.2-22.el5_10.1 net-snmp-libs.x86_64 1:5.3.2.2-22.el5_10.1

Complete!
[root@umserv]#

2. Simple SNMP configuration:

mv /etc/snmp/snmpd.conf /etc/snmp/snmpd.conf.old
Add   below configuration to /etc/snmp/snmpd.conf
rocommunity  public  xxx.xxx.xxx.xxx
rocommunity  public   127.0.0.1
syslocation  "HYD, UM DataCenter"
syscontact  surya@unixmantra.com

Replace xxx.xxx.xxx.xxx with the IP address of the server that you want to allow SNMP lookups from:
rocommunity public xxx.xxx.xxx.xxx

3. Start the SNMP service, and set it to auto-start on reboot:

/etc/init.d/snmpd start
chkconfig snmpd on
Note:If you have a firewall configured, ensure that you have UDP port 161 open to your SNMP lookup server.

4) Validation:

On your SNMP lookup server, you can do the following to perform a quick SNMP test to ensure that it’s working.
snmpwalk -v 2c -c public xxx.xxx.xxx.xxx or snmpwalk -v 1 -c public -O e 127.0.0.1
[root@umserv ~]# snmpwalk -v 1 -c public -O e 127.0.0.1
SNMPv2-MIB::sysDescr.0 = STRING: Linux umserv 2.6.18-92.1.17.el5 #1 SMP Mon Jul 14 06:07:13 IST 2014 i686
SNMPv2-MIB::sysObjectID.0 = OID: NET-SNMP-MIB::netSnmpAgentOIDs.10
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (16748) 0:02:47.48
SNMPv2-MIB::sysContact.0 = STRING: surya@unixmantra.com
SNMPv2-MIB::sysName.0 = STRING: umserv
SNMPv2-MIB::sysLocation.0 = STRING: "HYD, UM DataCenter"
SNMPv2-MIB::sysORLastChange.0 = Timeticks: (1) 0:00:00.01
...
...
Yes, it is working

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