Added extra tag called 'ldap' with isc-dhcp-server-ldap package installed

Also added additional build and run scripts for that variant.

This way of doing it duplicates a lot of code, but it does work. If anyone
has an idea of how to only use a single Dockerfile with an environment
variable or something like that to avoid the code duplication then I'd
very much like a pull request that solves this issue. Same goes for the
build and run scripts.

Author: robinsmidsrod

Dockerfile.ldap

@@ -0,0 +1,15 @@
+FROM ubuntu:18.04
+
+MAINTAINER Robin Smidsrød <[email protected]>
+
+ARG DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get -q -y update \
+ && apt-get -q -y -o "DPkg::Options::=--force-confold" -o "DPkg::Options::=--force-confdef" install apt-utils \
+ && apt-get -q -y -o "DPkg::Options::=--force-confold" -o "DPkg::Options::=--force-confdef" install dumb-init isc-dhcp-server-ldap man \
+ && apt-get -q -y autoremove \
+ && apt-get -q -y clean \
+ && rm -rf /var/lib/apt/lists/*
+
+COPY util/entrypoint.sh /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]

README.md

@@ -48,6 +48,12 @@ warning will be emitted informing you that you've probably forgotten it.
 If a `/data` volume is not provided with a `dhcpd.conf` inside it, the
 container will exit early with an error message.
 
+An additional Dockerfile has been added that allows building an image with
+the tag `:ldap` which contains the **isc-dhcp-server-ldap** package in
+addition to the normal DHCP server package.  Other than that it behaves in
+exactly the same way as the `:latest` tag.  Utility build and run scripts
+have also been added to work with this variant.
+
 Acknowledgements
 ================
 

build_ldap

@@ -0,0 +1,2 @@
+#!/bin/bash
+docker build -t networkboot/dhcpd:ldap -f Dockerfile.ldap "$@" $(dirname $0)

run_ldap

@@ -0,0 +1,5 @@
+#!/bin/bash
+pushd $(dirname $0) >/dev/null
+data_dir="$(pwd)/data"
+docker run -ti --rm --init --net host -v "$data_dir":/data networkboot/dhcpd:ldap "$@"
+popd >/dev/null