C2C blog post: Flexible Docker entrypoints scripts

Dockerfile

COPY /docker-entrypoint.sh /
COPY /docker-entrypoint.d/* /docker-entrypoint.d/
ONBUILD COPY /docker-entrypoint.d/* /docker-entrypoint.d/
ENTRYPOINT ["/docker-entrypoint.sh", "/opt/puppetlabs/puppet/bin/mcollectived"]
CMD ["--no-daemonize"]

monolithic_entrypoint.sh

#!/bin/sh

# Create user
useradd myservice

# Setup config
sed -i "s/PASSWD/${SERVICE_PASSWORD}/g" /etc/myservice.conf

# Start service
exec /usr/sbin/myservice "$@"

parts_entrypoint.sh

#!/bin/bash

DIR=/docker-entrypoint.d

if [[ -d "$DIR" ]]
then
  /bin/run-parts --verbose "$DIR"
fi

exec "$@"