Docker container slow startup

[jefferya]

Intermittently, the nerve docker container requires lengthy startup times. If continues, investigate the following.

The log contains the following:

org.apache.catalina.util.SessionIdGenerator createSecureRandom
INFO: Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [199,620] milliseconds.

Reference:

• https://stackoverflow.com/questions/58853372/what-exactly-does-djava-security-egd-file-dev-urandom-do-when-containerizi

• https://stackoverflow.com/questions/28201794/slow-startup-on-tomcat-7-0-57-because-of-securerandom

[Thaerious]

I had to mount urandom to random when running tomcat on the SHARCNET cloud. docker run -v /dev/urandom:/dev/random -it --rm -p 8080:8080 tomcat:9.0

I believe Tomcat waits for sufficient randomness to run https, and cloud images can be lacking randomness.