On the agent and manager server:
apt update
apt install snmp snmp-mibs-downloader
On the agent server: vim /etc/snmp/snmp.conf
/etc/snmp/snmp.conf
# As the snmp packages come without MIB files due to license reasons, loading
# of MIBs is disabled by default. If you added the MIBs you can reenable
# loading them by commenting out the following line.
#mibs :
vim /etc/snmp/snmpd.conf
Comment the following lines:
# Listen for connections from the local system only
#agentAddress udp:127.0.0.1:161
# Listen for connections on all interfaces (both IPv4 *and* IPv6)
agentAddress udp:161,udp6:[::1]:161
vim /etc/snmp/snmpd.conf
Add these lines:
createUser bootstrap MD5 temp_password DES
rwuser bootstrap priv
rwuser demo priv
systemctl restart snmpd
On the Manager server: Verify with snmpget
snmpget -u bootstrap -l authPriv -a MD5 -x DES -A temp_password -X temp_password agent_server_ip_address 1.3.6.1.2.1.1.1.0
Output
SNMPv2-MIB::sysDescr.0 = STRING: Linux agent 4.15.0-66-generic #75-Ubuntu SMP Tue Oct 1 05:24:09 UTC 2019 x86_64
Create a user based on bootstrap
snmpusm -u bootstrap -l authPriv -a MD5 -x DES -A temp_password -X temp_password agent_server_ip_address create demo bootstrap
Change the password
snmpusm -u demo -l authPriv -a MD5 -x DES -A temp_password -X temp_password agent_server_ip_address passwd temp_password new_password
On the Agent server:
Remove the bootstrap
vim /etc/snmp/snmpd.conf
Comment the following lines:
...
#createUser bootstrap MD5 temp_password DES
#rwuser bootstrap priv
...
On the Manager server:
snmpusm -u bootstrap -l authPriv -a MD5 -x DES -A temp_password -X temp_password 100.90.8.48 delete bootstrap
User successfully deleted.
On the Agent server:
systemctl restart snmpd
