Error: Not authenticated in Browser when trying with http://external_ip:nodeport

I am using Docker (Contain Runtime Engine)

I need to test checkmk on enterprise free edition image,
Please confirm if i can download docker image: checkmk/check-mk-free:2.1.0 as mentioned in below link

and further follow below guide to deploy as pod in kubernetes cluster

Please confirm if like this way, checkmk server will be able to connect with checkmk collector pods…and i will be able to access checkmk GUI and also able to get kubernetes cluster metrics

Thanks
Nitin Goyal