docker-bind/entrypoint.sh

#!/bin/bash
set -e

ROOT_PASSWORD=${ROOT_PASSWORD:-password}

# script variables
BIND_DATA_DIR=${DATA_DIR}/bind
WEBMIN_DATA_DIR=${DATA_DIR}/webmin

# configuration variables
WEBMIN_ENABLED=${WEBMIN_ENABLED:-true}

## ...and here we go
chmod 755 ${DATA_DIR}

# create directory for bind config
mkdir -p ${BIND_DATA_DIR}
chown -R root:${BIND_USER} ${BIND_DATA_DIR}

# populate default bind configuration if it does not exist
if [ ! -d ${BIND_DATA_DIR}/etc ]; then
  mv /etc/bind ${BIND_DATA_DIR}/etc
fi
rm -rf /etc/bind
ln -sf ${BIND_DATA_DIR}/etc /etc/bind

if [ ! -d ${BIND_DATA_DIR}/lib ]; then
  mkdir -p ${BIND_DATA_DIR}/lib
  chown root:${BIND_USER} ${BIND_DATA_DIR}/lib
fi
rm -rf /var/lib/bind
ln -sf ${BIND_DATA_DIR}/lib /var/lib/bind

# create /var/run/named
mkdir -m 0775 -p /var/run/named
chown root:${BIND_USER} /var/run/named

# allow arguments to be passed to named
if [[ ${1:0:1} = '-' ]]; then
  EXTRA_ARGS="$@"
  set --
elif [[ ${1} == named || ${1} == $(which named) ]]; then
  EXTRA_ARGS="${@:2}"
  set --
fi

# default behaviour is to launch named
if [ -z "$@" ]; then
  if [ "${WEBMIN_ENABLED}" == "true" ]; then
    # create directory for webmin
    mkdir -p ${WEBMIN_DATA_DIR}

    # populate the default webmin configuration if it does not exist
    if [ ! -d ${WEBMIN_DATA_DIR}/etc ]; then
      mv /etc/webmin ${WEBMIN_DATA_DIR}/etc
    fi
    rm -rf /etc/webmin
    ln -sf ${WEBMIN_DATA_DIR}/etc /etc/webmin

    # set root user password
    echo "root:$ROOT_PASSWORD" | chpasswd

    echo "Starting webmin..."
    /etc/init.d/webmin start
  fi

  echo "Starting named..."
  exec $(which named) -u ${BIND_USER} -g ${EXTRA_ARGS}
else
  exec "$@"
fi