snmp - centos

step 1.
yum -y install net-snmp net-snmp-devel

step2.
com2sec notConfigUser  default       public

group   notConfigGroup v1           notConfigUser
group   notConfigGroup v2c           notConfigUser

view    systemview    included   .1.3.6.1.2.1.1
view    systemview    included   .1.3.6.1.2.1.25.1.1

access  notConfigGroup ""      any       noauth    exact  mib2  none none

view all    included  .1                               80

view mib2   included  .iso.org.dod.internet.mgmt.mib-2 fc

access  notConfigGroup ""      any       noauth    exact  roview rwview none

syslocation Unknown (edit /etc/snmp/snmpd.conf)
syscontact Root <root@localhost> (configure /etc/snmp/snmp.local.conf)

dontLogTCPWrappersConnects yes

proc mountd
proc ntalkd 4
proc sendmail 10 1

rouser jkb auth
createUser jkb MD5 iampassword

step.3(189是监控机)
iptables -A INPUT -s 172.16.1.189 -p udp --dport 161 -j ACCEPT