Hello,

recently I had a need to execute CentOS image with bash. Following command proved helpful for me:

docker run -i -t --rm centos /bin/bash

Then at executed image you can do whatever you want. For example I had  a need to validate DNS server activity. 

For this purpose I had to find what provides dig.

Following command told me what:

yum whatprovides dig

And next command installed:

yum install bind-utils