Dockerfile

# As a certified Kubernetes application developer, you 
# should be able to define and build container images.

# Use base image
FROM docker.io/redhat/ubi8:8.7

# Install the java-1.8.0-openjdk-devel package
# We also need the unzip package to unpack the JBoss .zip archive
RUN yum install -y java-1.8.0-openjdk-devel unzip && yum clean all

# Create a system user and group for jboss, they both have a UID and GID of 1100
# Set the jboss user's home directory to /opt/jboss
RUN groupadd -r -g 1100 jboss && useradd -u 1100 -r -m -g jboss -d /opt/jboss -s /sbin/nologin jboss

# Set the environment variable JBOSS_HOME to /opt/jboss/jboss-eap-7.4.0
ENV JBOSS_HOME="/opt/jboss/jboss-eap-7.4"

# Set the working directory to jboss' user home directory
WORKDIR /opt/jboss

# Unpack the jboss-eap-7.4.0.zip file to the /opt/jboss directory
ADD ./jboss-eap-7.4.0.zip /opt/jboss
RUN unzip /opt/jboss/jboss-eap-7.4.0.zip

# Recursively change the ownership of the jboss user's home directory to jboss:jboss
# Make sure to RUN the chown after the ADD command and before it, as ADD will
# create new files and directories with a UID and GID of 0 by default
RUN chown -R jboss:jboss /opt/jboss

# Make the container run as the jboss user
USER jboss

# Expose JBoss port
EXPOSE 8080

# Start JBoss, use the exec form which is the preferred form
ENTRYPOINT ["/opt/jboss/jboss-eap-7.4/bin/standalone.sh", "-b", "0.0.0.0", "-c", "standalone-full-ha.xml"]