Dockerfile for a minimal Ubuntu instance containing a number of LDAP client utilities that allows SSH login and X11 forwarding.

Dockerfile

FROM ubuntu:latest

ENV DEBIAN_FRONTEND=noninteractive
RUN apt update && apt install sudo vim inetutils-ping traceroute curl xbase-clients x11-apps openssh-server jxplorer ldapvi ldap-utils -y
RUN useradd -rm -d /home/ubuntu -s /bin/bash -g root -G sudo -u 1000 ldapuser
RUN  echo 'ldapuser:ldappwd' | chpasswd
RUN echo 'X11UseLocalhost no' >> /etc/ssh/sshd_config
RUN echo 'AddressFamily inet' >> /etc/ssh/sshd_config
RUN service ssh start

EXPOSE 22

CMD ["/usr/sbin/sshd","-D"]

Build with docker build -t ldaputils-ubuntu ., then run it with docker run -p 2022:22 ldaputils-ubuntu.