Configure SNMP for CentOS

Configure SNMP for CentOS

<Span style = "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:

# First, map the community name "public" into a "security name"#       sec.name  source          communitycom2sec notConfigUser  default       public##### Second, map the security name into a group name:#       groupName      securityModel securityNamegroup   notConfigGroup v1           notConfigUsergroup   notConfigGroup v2c           notConfigUser##### Third, create a view for us to let the group have rights to:# Make at least  snmpwalk -v 1 localhost -c public system fast again.#       name           incl/excl     subtree         mask(optional)view    systemview    included   .1.3.6.1.2.1.1view    systemview    included   .1.3.6.1.2.1.25.1.1##### Finally, grant the group read-only access to the systemview view.#       group          context sec.model sec.level prefix read   write  notifaccess  notConfigGroup ""      any       noauth    exact  systemview none none

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