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I. How To Install and Configure SNMP on CentOS
II. How To Change the SNMP Port on CentOS Introduction
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.
Pre-Flight Check
Install SNMP and SNMP Utilities
Installing SNMP and some optional SNMP utilities is as simple as running one command:
yum -y install net-snmp net-snmp-utils
Add a Basic Configuration for SNMP
Now, let’s take the default SNMP configuration file, /etc/snmp/snmpd.conf and move it to an alternate location, /etc/snmp/snmpd.conf.orig.
mv /etc/snmp/snmpd.conf /etc/snmp/snmpd.conf.orig
And now we’ll create a new /etc/snmp/snmpd.conf:
vim /etc/snmp/snmpd.conf
For a refresher on editing files with vim see: New User Tutorial: Overview of the Vim Text Editor
Insert the following text into the new /etc/snmp/snmpd.conf
# Map 'idv90we3rnov90wer' community to the 'ConfigUser'
The above text is noted with basic information on the function of each configuration line. In short, we’re creating two scenarios for polling information from SNMP version 2c.
Note: SNMPv2c contains some security enhancements over SNMPv1 but uses the existing SNMPv1 administration structure, which is “community” based. Areas of improvement include: transport mappings, protocol packet types, and MIB structure elements.
In the first scenario: ConfigUser is assigned to ConfigGroup and may only use SNMP security model 2c, ConfigGroup can use the SystemView, SystemView is assigned to two OID sub-trees, and all of this is referenced in an SNMP poll by the secret, and unique community string idv90we3rnov90wer.
In the second scenario: AllUser is assigned to AllGroup and may only use SNMP security model 2c, AllGroup can use the AllView, AllView is assigned to the entire OID tree, and all of this is referenced in an SNMP poll by the secret, and unique community string 209ijvfwer0df92jd.
Important Tip: Be ABSOLUTELY SURE that you choose a unique community string and replace the community strings in the above examples. Keep each secret, and keep each safe.
Exit vim, and restart the SNMP service to reload the new configuration file:
service snmpd restart
Configure SNMP to start when the server boots:
chkconfig snmpd on
Test the SNMP Configuration
Now let’s test the SNMP configuration… try running the following two commands:
snmpwalk -v 2c -c idv90we3rnov90wer -O e 127.0.0.1 snmpwalk -v 2c -c 209ijvfwer0df92jd -O e 127.0.0.1
Note: The default port for SNMP is 161 and 162. If you’re going to connect to SNMP from a remote server, be sure your server’s firewall has the appropriate ports open.
The result for your first command should be about 33 lines, and contain some basic system information. The result for the second command should contain a lot more information about your system, and will likely be thousands of lines.
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Disclaimer: Although we make every effort to ensure the validity of submissions to the GTAGarage database, GTANet cannot accept responsibility for the contents of user submitted files.Website:Works with:Release/Version:4.0Status:CompleteStarted on:23 Nov 2011Last Updated:20 Jul 2012Views:412260Type:Collaborative (other modder(s)' work involved)Rating:(53 votes)Please to rate this modDescriptionCreator/Developer: OJdoesIt/HeresOtisRelease Date: May 11, 2012 (5/11/12) (GTAGarage never approved the new file/version. You can get it by clicking on the site under my name)Waiting for moderator to approve new mod which should have an upload date of May 2012. Don't download the old version, most likely will crash.
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