Configure SNMP in CentOS

Configure SNMP in CentOS
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1. <Spanstyle = "font-size: 14px;"> This article describes how to configure a simple SNMP Service in the CentOS environment </span>

Software Installation

Switch to the system administrator account

Install snmp
Check that the snmp agent is installed.
Rpm-q net-snmp
If not, install snmp
Yum install net-snmp

Set automatic snmp running upon startup
/Sbin/chkconfig snmpd on Configure snmp

Modify configuration file

Back up the original configuration file and edit/etc/snmp/snmpd. conf. The simple configuration is as follows:

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1. # First, mapthecommunityname "public" using a "securityname"
3. # Sec. namesourcecommunity
4. Com2secnotconfiguserdefapublic public
6. ####
7. # Second, mapthesecuritynamepolicagroupname:
9. # GroupNamesecurityModelsecurityName
10. GroupnotConfigGroupv1notConfigUser
11. GroupnotConfigGroupv2cnotConfigUser
13. ####
14. # Third, createaviewforustoletthegrouphaverightsto:
16. # Makeatleastsnmpwalk-v1localhost-cpublicsystemfastagain.
17. # Nameincl/exclsubtreemask (optional)
18. Viewsystemviewincluded.1.3.6.1.2.1.1
19. Viewsystemviewincluded.1.3.6.1.2.1.25.1.1
21. ####
22. # Finally, grantthegroupread-onlyaccesstothesystemviewview.
24. # Groupcontextsec. modelsec. levelprefixreadwritenotif
25. AccessnotConfigGroup "" anynoauthexactsystemviewnonenone

Start snmp

/Etc/init. d/snmpd start
Restart the snmp service if it has been started.
/Etc/init. d/snmpd restart

Test snmp

Check whether the port is enabled
Netstat-ln | grep 161

Install the snmp Test Tool
Yum install net-snmp-utils

Test snmp data on the local machine (modify monit to the group name configured)
Snmpwalk-v 2c-c public localhost system

Snmpwalk-v3-u username-l auth-a MD5-A password localhost

Create an SNMP (v3) User

Net-snmp-config -- create-snmpv3-user-ro-a MD5 lyceemsnmp lyceem.com

Remote Test of snmp data (modify the ip address to the server ip address, and install net-snmp for the snmpwalk command)
Snmpwalk-v 2c-c public ip system

Troubleshooting: if the local test snmp has data and the Remote Test snmp has no data, the server firewall prohibits external access to port udp 161 of the server:
Modify/etc/sysconfig/iptables (or:/etc/sysconfig/iptables-config) and add the following rules:
-A RH-Firewall-1-INPUT-p udp-m state Cstate NEW-m udp Cdport 161-j ACCEPT
Restart iptables
/Etc/init. d/iptables restart