1) I don't know what the issue is with connecting to MySQL. Definitely ensure that MySQL is running (sudo service mysqld status; sudo service mysqld restart). The configuration is in /etc/cloudera-scm-server/db.properties.   2) We do not have a recommended solution for running Hadoop on Docker. Director currently supports cloud platforms like AWS but not Docker. Docker is somewhat counter-productive for production Hadoop clusters because even though Hadoop is designed to get a bunch of machines to work together, having the cluster split into fewer, bigger pieces is better. Docker essentially partiations a machine into smaller pieces. It can be handy for testing, etc. when performance doesn't matter, but it requires a lot of networking setup to make DNS and IP addresses, etc. work the way Cloudera Manager and Hadoop assume they do. ... View more