Dockerfile

# ------------------------------------------------------------------------------
# Based on a work at https://github.com/docker/docker.
# ------------------------------------------------------------------------------
# Pull base image.
FROM ubuntu
MAINTAINER Sangar Ali <sangargeo@gmail.com>

# Install Supervisor.
RUN \
  apt-get update && \
  apt-get install -y supervisor && \
  rm -rf /var/lib/apt/lists/* && \
  sed -i 's/^\(\[supervisord\]\)$/\1\nnodaemon=true/' /etc/supervisor/supervisord.conf

# Define mountable directories.
VOLUME ["/etc/supervisor/conf.d"]

# ------------------------------------------------------------------------------
# Security changes
# - Determine runlevel and services at startup [BOOT-5180]
RUN update-rc.d supervisor defaults

# - Check the output of apt-cache policy manually to determine why output is empty [KRNL-5788]
RUN apt-get update | apt-get upgrade -y

# - Install a PAM module for password strength testing like pam_cracklib or pam_passwdqc [AUTH-9262]
RUN apt-get install libpam-cracklib -y
RUN ln -s /lib/x86_64-linux-gnu/security/pam_cracklib.so /lib/security

# Define working directory.
WORKDIR /etc/supervisor/conf.d

# ------------------------------------------------------------------------------
# Start supervisor, define default command.
CMD ["supervisord", "-c", "/etc/supervisor/supervisord.conf"]