Change SNMP v3 admin password
1. Stop the SNMP daemon.
admin@livenx:~$ sudo systemctl stop snmpd
2. Add the following to /var/lib/snmp/snmpd.conf . Please update passphrase1 and passphrase2 with desired passphrases.
createUser admin SHA "passphrase1" AES passphrase2
3. Start the SNMP daemon.
admin@livenx:~$ sudo systemctl start snmpd