1. install snmp snmpd
  2. install net-snmp-utils net-snmp-devel
  3. service snmpd stop

  4. net-snmp-config --create-snmpv3-user -ro -a PASSWORD -X AES -A SHA USERNAME
    This creates an SNMPv3 user called USERNAME that has read only access (-ro) authenticated (-a) access with a PASSWORD using AES for encryption (-X) and SHA for your hashes (-A). Edit /etc/snmp/snmpd.conf and change rouser USERNAME to rouser USERNAME priv, this forces encryption for all traffic.

  5. sudo service snmpd start
  6. test
    snmpwalk -v 3 -l authPriv -a sha -A PASSWORD -x AES -X PASSWORD -u USERNAME localhost

如果没有安装net-snmp，手动配置：

sudo service snmpd stop

Edit /var/net-snmp/snmpd.conf and add the following line to the bottom of the file:

createUser USERNAME SHA "PASSWORD" AES

When snmpd is started again the password will be hashed and added to the file, the original un-hashed password will be removed. This line specifies the use of SHA for the hash and AES for the encryption. Edit /etc/snmp/snmpd.conf and add the following line to the bottom, or in a place you deem appropriate:

rouser USERNAME priv

This line will add a read only user that can only be accessed via AuthPriv, so with session integrity and encryption enabled. Start snmpd:

sudo service snmpd start

Test:

snmpwalk -v 3 -l authPriv -a sha -A PASSWORD -x AES -X PASSWORD -u USERNAME localhost

参考：https://stomp.colorado.edu/blog/blog/2010/07/09/on-configuring-snmpv3-in-net-snmp/