Adding new Dockerfile that can be use to build any Centos 7.x docker …

images/centos7.x/Dockerfile

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+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+ARG BASE_IMAGE=centos:7.8.2003
+FROM ${BASE_IMAGE}
+ENV container docker
+
+# Delete a number of unit files which might cause issues.
+RUN (cd /lib/systemd/system/sysinit.target.wants/; for i in *; do [ $i == \
+systemd-tmpfiles-setup.service ] || rm -f $i; done); \
+rm -f /lib/systemd/system/multi-user.target.wants/*;\
+rm -f /etc/systemd/system/*.wants/*;\
+rm -f /lib/systemd/system/local-fs.target.wants/*; \
+rm -f /lib/systemd/system/sockets.target.wants/*udev*; \
+rm -f /lib/systemd/system/sockets.target.wants/*initctl*; \
+rm -f /lib/systemd/system/basic.target.wants/*;\
+rm -f /lib/systemd/system/anaconda.target.wants/*;
+
+# Install useful things that are missing from the centos:7.4.1708 image.
+RUN yum install -y initscripts \
+    openssh-clients \
+    openssh-server \
+    rsyslog \
+    sudo \
+    wget \
+    which && \
+    yum clean all
+
+# Add pre-created SSH keys into .ssh folder.
+ADD ssh /root/.ssh/
+
+# Copy public key into authorized_keys and limit access to the private key to ensure SSH can use it.
+RUN cp /root/.ssh/id_rsa.pub /root/.ssh/authorized_keys && \
+    chmod 600 /root/.ssh/id_rsa
+
+# The official CentOS Docker images retain the inclusion of the 20-nproc.conf file that only applies on a real machine.
+# This file overrides reasonable defaults for things like the maximum number of user processes when running commands
+# as a non-root user. Get rid of it (and see tinyurl.com/zqdfzpg).
+RUN rm /etc/security/limits.d/20-nproc.conf
+
+# Disable strict host key checking to /dev/null to make SSH between containers less of a pain.
+RUN sed -i -r "s|^Host \*\s*|&\n        StrictHostKeyChecking no|" /etc/ssh/ssh_config
+
+CMD ["/usr/sbin/init"]

images/centos7.x/readme.txt

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+To build a centos 7.x image, use the folowing command.
+
+docker build . -t clusterdock/topology_nodebase:centos7.8 --build-arg BASE_IMAGE=centos7.8.2003
+
+The build-arg BASE_IMAGE can take any valid centos 7.x tags from the official centos repo on docker hub.

images/centos7.x/ssh/id_rsa

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+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----

images/centos7.x/ssh/id_rsa.pub

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+ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC2P/Jlk0X5u/bp6paqzH68V6FKXEEmn9CEisVYqmMdylAnb2jqEk32ahTcah+3YLnDoWhl2MLVNaXOHFSdFLzF6SwWdbci2+SPJIsDUirqNyFjE119ncfBN0fSu5szW4n8KeRqKOjEGoYGY9IvRPF+py15onwA+GyXCXRZYnpv60EIcNWlMsBN5u2CAIB+EqZK4BiafdAionsMWhIaTCGTGlQe65UJnFQfcIjEsjD7qekCuv9LmC0WjnSiLoVc+a+/qYmDrIuqrdWUpxCHp38I5omikef6ct53aQQIRJSWlOu4ymvohwYRKDPiGeSaGinyhNjjaxAmE88XYCGr1rdp clusterdock