How to start multiple processes in Docker?

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To run multiple services in a single container there are multiple ways



With a script:

  • you start any number of programs in the background,
  • and you start a process at the end that stay in the foreground to keep the VM alive.

Example of script:

set -m # to make job control work
/app/server &
/app/server -bar &
fg %1 

Docker file with the ENTRYPOINT instruction

ADD /app/

Process Manager

A process manager can start more than one process.

Example with overmind

  • A Procfile with two commands:
web: bundle exec rails server -p $PORT
foo: /app/foo
ADD Procfile /app/
CMD overmind start

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