[ec2-user@ip-172-31-47-243 ~]$ maxadmin -u perm_admin -p password add user geoff thispasswordislong

User geoff has been successfully added.

[ec2-user@ip-172-31-47-243 ~]$ maxadmin -u geoff -p thispass -h 127.0.0.1 show users

Administration interface users:

Users table data

Hashtable: 0x350b2b0, size 52

        No. of entries:         2

        Average chain length:   0.0

        Longest chain length:   1

User names: perm_admin, geoff

[ec2-user@ip-172-31-47-243 ~]$ maxadmin -u geoff -p thispas -h 127.0.0.1 show users

Failed to connect to MaxScale. Incorrect username or password.