It seems the testrail/apache image has no Tag `latest` and therefor is failing to pull it. ``` docker image pull testrail/apache Using default tag: latest Error response from daemon: manifest for testrail/apache:latest not found: manifest unknown: manifest unknown ``` See: https://hub.docker.com/r/testrail/apache/tags?page=1&name=latest It seems to me that there is a `default` tag that could be used instead.