Anyone installed Observium on CentOS minimal?

Hi,

I've seen Observium being used at another company and thought I try it out on my home lab on CentOS with a couple of VMs and GNS3 for some fun.

https://www.itzgeek.com/how-tos/linux/install-observium-on-centos-7-debian-9-ubuntu-16-04-a-network-management-and-monitoring-system.html

I've followed these instructions and get an:

[root@localhost observium]# cd /opt/observium

[root@localhost observium]# ./discovery.php -u

DB Error 1045: Access denied for user 'observium'@'localhost' (using password: YES)

[root@localhost observium]#

It's right at the end of the install too, any ideas?

Thanks