I am creating a container for Podman that runs Samba Active Directory as a Primary Domain Controller and with Bind DNS backend.
It is based of a previous container that I made which had volume mappings to both Samba and Bind and that I have gotten up and running, but I thought it looked a bit messy and would become even more messy when I also wanted to have to backup of running Active Directory config inside the container.
My goal is therefore to move the all Samba and Bind related files to a new location, so I only have to map one volume and make symlinks so navigation is preserved.
My idea is to use the /srv folder as the root for my configuration files and make following symlink structure:
/etc/krb5.keytab -> /srv/conf/etc/krb5.keytab
/etc/krb5.conf -> /srv/conf/etc/krb5.conf
/etc/bind/ -> /srv/conf/etc/bind/
/etc/samba/ -> /srv/conf/etc/samba/
/var/lib/samba/ -> /srv/conf/lib/
On top of that I also made the folder path /srv/backup due to I want to place backups from samba-tool to land in that folder as it can be picked up by Podman host as part of its backup routine.
To that end I have amongst others the following lines in my Dockerfile:
# Use Ubuntu 22.04 LTS as base for my container
FROM ubuntu:jammy
ENV DEBIAN_FRONTEND noninteractive
# Avoid ERROR: invoke-rc.d: policy-rc.d denied execution of start.
RUN echo "#!/bin/sh\nexit 0" > /usr/sbin/policy-rc.d
# Try creating a single mount point
VOLUME ["/srv"]
# Setup ssh and install supervisord
RUN apt-get update
RUN apt-get upgrade -y
# Install bind9 dns server
RUN apt-get install -y bind9 dnsutils
# Add customized Bind options to default bind install location.
# Note:
# Assume Dockerfile is placed at /workdir/Dockerfile
#
# Then "etc/bind/named.conf.options" is placed at
# /workdir/etc/bind/named.conf.options
#
# The second argument is where should the file be placed
# inside the countainer.
ADD etc/bind/named.conf.options /etc/bind/named.conf.options
# Install samba and dependencies to make it an Active Directory Domain Controller
RUN apt-get install -y samba smbclient winbind libpam-winbind libnss-winbind krb5-kdc libpam-krb5
# Skipping a bit of the Dockerfile here, since it is not relevant
# for the question.
#
# Create backup dir that is being used by samba-tool
# inside the container to store backups of samba.
RUN mkdir -p /srv/backup
# Create folder for all files in /etc folder that
# can be modified during running of container.
#
# The '-p' argument creates any missing parent folder, like
# if /etc/conf does not exist it will created at the same time as
# /etc/conf/etc folder.
RUN mkdir -p /srv/conf/etc
# Move configuration of Bind and Samba to a folder that can be
# saved between reboots.
RUN mv /etc/bind /srv/conf/etc/
RUN mv /etc/samba /srv/conf/etc/
# Add symlinks so Bind and Samba configuration can be accessed
# from /etc folder
RUN ln -s /srv/conf/etc/bind /etc/bind
RUN ln -s /srv/conf/etc/samba /etc/samba
# Add folder for Samba lib files than can be saved between reboots.
RUN mkdir -p /srv/conf/lib
# Move Samba lib files to the new lib folder.
RUN mv /var/lib/samba/* /srv/conf/lib/
# Delete old lib folder as the folder name 'samba' was not moved.
RUN rm /var/lib/samba/'
# Make symlink so Samba lib files can be access via /var/lib/samba
RUN ln -s /srv/conf/lib /var/lib/samba
The above is most of the lines in my Dockerfile, though a few lines have been omitted, due to not being relevant for question.
However. When I try to build the container by using Ansible I get the following error during build:
fatal: [buildserver.example.com]: FAILED! => {"changed": false, "msg": "Failed to build
image samba-ad2:latest:
mv: cannot move '/etc/bind' to '/srv/conf/etc/': No such file or directory
Error: error building at STEP \"RUN mv /etc/bind /srv/conf/etc/\":
error while running runtime: exit status 1\n"}
Error code has been formatted for readability.
I am certain that I am making typos in my Dockerfile, but what typos?
