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for RKE - it uses docker right ?

I don't think so, my understanding that RKE uses docker but docker ps does not work as well

Docker is a pretty hard dependency of RKE. If you don't have docker installed. You don't have RKE installed. RKE is really just kubernetes in docker containers.

I am sure it is an RKE cluster on aws ec2 instance. The node is RHEL

If you are just after disk usage by container, try this:

docker system df

Reference: https://docs.docker.com/engine/reference/commandline/system_df/