Docker CMD and SIGTERM

README.md

1. docker build .
2. docker run --rm -it IMAGE-ID
3. from different terminal try docker stop CONTAINER-ID ... won't stop

examina the output of ps aux, who is PID 1?

Dockerfile

FROM ubuntu:precise

COPY sigterm-exp /app/

CMD /app/sigterm-exp

sigterm-exp

#!/usr/bin/env bash 

set -euo pipefail

_term() { 
  echo "Caught SIGTERM signal!"
  exit 0
}

trap _term SIGTERM

echo 'ps aux'
ps aux
echo

while true; do	
  echo "running..."
  sleep 3 
done