安装snmp
确认snmp代理已安装
rpm -q net-snmp
如果未安装，安装snmp
yum install net-snmp
设置开机自动运行snmp
/sbin/chkconfig snmpd on配置snmp
修改配置文件
将原来的配置文件备份，编辑/etc/snmp/snmpd.conf，简单配置如下
# First, map the community name "public" into a "security name"
# sec.name source community
com2sec notConfigUser default public
####
# Second, map the security name into a group name:
# groupName securityModel securityName
group notConfigGroup v1 notConfigUser
group 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 .1.3.6.1.2.1.1
view 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 notif
access notConfigGroup "" any noauth exact systemview none none
启动snmp
/etc/init.d/snmpd start
如果已启动则重启snmp服务
/etc/init.d/snmpd restart
测试snmp
查看端口是否打开
netstat -ln | grep 161
安装snmp测试工具
yum install net-snmp-utils
本机测试snmp数据（修改monit为配置的团体名）
snmpwalk -v 2c -c public localhost system
snmpwalk -v3 -u username -l auth -a MD5 -A password localhost
创建SNMP（v3）用户
net-snmp-config --create-snmpv3-user -ro -a MD5 lyceemsnmp lyceem.com
远程测试snmp数据（修改ip为服务器ip，snmpwalk命令需要安装net-snmp）
snmpwalk -v 2c -c public ip system
故常处理
错误排除如果本地测试snmp有数据，远程测试snmp无数据则由于服务器防火墙禁止了外部访问服务器udp 161端口，则：
修改 /etc/sysconfig/iptables （或者：/etc/sysconfig/iptables-config ） ，增加如下规则：
-A RH-Firewall-1-INPUT -p udp -m state Cstate NEW -m udp Cdport 161 -j ACCEPT
重启iptables
/etc/init.d/iptables restart
本文出自 “Lonely(技术群：1991706）” 博客，请务必保留此出处http://304076020.blog.51cto.com/7503470/1545302
原文：http://304076020.blog.51cto.com/7503470/1545302