Remove extra period

Dockerfile

@@ -12,11 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM centos:centos7
-
-MAINTAINER Sonatype <cloud-ops@sonatype.com>
+FROM registry.access.redhat.com/ubi8/ubi
 
 LABEL vendor=Sonatype \
+      maintainer="Sonatype <cloud-ops@sonatype.com>" \
       com.sonatype.license="Apache License, Version 2.0" \
       com.sonatype.name="Nexus Repository Manager base image"
 
@@ -30,7 +29,7 @@ ENV NEXUS_HOME=${SONATYPE_DIR}/nexus \
     NEXUS_DATA=/nexus-data \
     NEXUS_CONTEXT='' \
     SONATYPE_WORK=${SONATYPE_DIR}/sonatype-work \
-    DOCKER_TYPE='docker'
+    DOCKER_TYPE='rh-docker'
 
 ARG NEXUS_REPOSITORY_MANAGER_COOKBOOK_VERSION="release-0.5.20190212-155606.d1afdfe"
 ARG NEXUS_REPOSITORY_MANAGER_COOKBOOK_URL="https://github.com/sonatype/chef-nexus-repository-manager/releases/download/${NEXUS_REPOSITORY_MANAGER_COOKBOOK_VERSION}/chef-nexus-repository-manager.tar.gz"
@@ -39,17 +38,18 @@ ADD solo.json.erb /var/chef/solo.json.erb
 
 # Install using chef-solo
 # Chef version locked to avoid needing to accept the EULA on behalf of whomever builds the image
-RUN curl -L https://www.getchef.com/chef/install.sh | bash -s -- -v 14.12.9 \
+RUN yum install -y --disableplugin=subscription-manager hostname procps \
+    && curl -L https://www.getchef.com/chef/install.sh | bash -s -- -v 14.12.9 \
     && /opt/chef/embedded/bin/erb /var/chef/solo.json.erb > /var/chef/solo.json \
     && chef-solo \
        --recipe-url ${NEXUS_REPOSITORY_MANAGER_COOKBOOK_URL} \
        --json-attributes /var/chef/solo.json \
     && rpm -qa *chef* | xargs rpm -e \
-    && rpm --rebuilddb \
     && rm -rf /etc/chef \
     && rm -rf /opt/chefdk \
     && rm -rf /var/cache/yum \
-    && rm -rf /var/chef
+    && rm -rf /var/chef \
+    && yum clean all
 
 VOLUME ${NEXUS_DATA}
 

README.md

@@ -20,7 +20,7 @@
 
 [![Join the chat at https://gitter.im/sonatype/nexus-developers](https://badges.gitter.im/sonatype/nexus-developers.svg)](https://gitter.im/sonatype/nexus-developers?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
-A Dockerfile for Sonatype Nexus Repository Manager 3, based on CentOS.
+A Dockerfile for Sonatype Nexus Repository Manager 3, starting with 3.18 the image is based on the [Red Hat Universal Base Image](https://www.redhat.com/en/blog/introducing-red-hat-universal-base-image) while earlier versions used CentOS.
 
 * [Contribution Guidlines](#contribution-guidelines)
 * [Running](#running)