revert erroneous commit(wrong branch)

README.md

@@ -1,7 +1,82 @@
 # sonatype/nexus3
 
-
 A Dockerfile for Sonatype Nexus Repository Manager 3, based on CentOS.
 
-# DEPRECATED
-This repository content has moved to https://github.com/sonatype/docker-nexus3 in order to properly enable auto-builds on Dockerhub.
+To run, binding the exposed port 8081 to the host.
+
+```
+$ docker run -d -p 8081:8081 --name nexus sonatype/nexus3
+```
+
+To test:
+
+```
+$ curl -u admin:admin123 http:https://localhost:8081/service/metrics/ping
+```
+
+To (re)build the image:
+
+Copy the Dockerfile and do the build-
+
+```
+$ docker build --rm=true --tag=sonatype/nexus3 .
+```
+
+
+## Notes
+
+* Default credentials are: `admin` / `admin123`
+
+* It can take some time (2-3 minutes) for the service to launch in a
+new container. You can tail the log to determine once Nexus is ready:
+
+```
+$ docker logs -f nexus
+```
+
+* Installation of Nexus is to `/opt/sonatype/nexus`. 
+
+* A persistent directory, `/nexus-data`, is used for configuration,
+logs, and storage. This directory needs to be writable by the Nexus
+process, which runs as UID 200.
+
+* Three environment variables can be used to control the JVM arguments
+
+ * `JAVA_MAX_MEM`, passed as -Xmx. Defaults to `1200m`.
+
+ * `JAVA_MIN_MEM`, passed as -Xms. Defaults to `1200m`.
+
+ * `EXTRA_JAVA_OPTS`. Additional options can be passed to the JVM via
+ this variable.
+
+ These can be used supplied at runtime to control the JVM:
+
+ ```
+ $ docker run -d -p 8081:8081 --name nexus -e JAVA_MAX_HEAP=768m sonatype/nexus3
+ ```
+
+
+### Persistent Data
+
+There are two general approaches to handling persistent storage requirements
+with Docker. See [Managing Data in Containers](https://docs.docker.com/userguide/dockervolumes/)
+for additional information.
+
+ 1. *Use a data volume container*. Since data volumes are persistent
+ until no containers use them, a container can created specifically for 
+ this purpose. This is the recommended approach. 
+
+ ```
+ $ docker run -d --name nexus-data sonatype/nexus3 echo "data-only container for Nexus"
+ $ docker run -d -p 8081:8081 --name nexus --volumes-from nexus-data sonatype/nexus3
+ ```
+
+ 2. *Mount a host directory as the volume*. This is not portable, as it
+ relies on the directory existing with correct permissions on the host.
+ However it can be useful in certain situations where this volume needs
+ to be assigned to certain specific underlying storage. 
+
+ ```
+ $ mkdir /some/dir/nexus-data && chown -R 200 /some/dir/nexus-data
+ $ docker run -d -p 8081:8081 --name nexus -v /some/dir/nexus-data:/nexus-data sonatype/nexus3
+ ```