Just a little reminder to self: when running Tomcat with Java 8 in an Ubuntu Docker container, Tomcat will take a very long time (minutes!) to start with even the simplest web application.
The issue is actually documented (not entirely Docker-related). The solution is to modify JAVA_OPTS to use a different random device:
JAVA_OPTS=-Djava.security.egd=file:/dev/urandom
George's Techblog 
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