20170515 update - Michael O'Brien: docker must be running to build dcae-inventory

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I was trying to build dcae-inventory on Ubuntu 14.04 with Apache Maven 3.3.9 but it returned the following.

[INFO] Replacing original artifact with shaded artifact.
[INFO] Replacing /home/chingting/Desktop/ONAP/dcae/dcae-inventory/target/dcae-inventory-1.1.0.jar with /home/chingting/Desktop/ONAP/dcae/dcae-inventory/target/dcae-inventory-1.1.0-shaded.jar
[INFO] Dependency-reduced POM written at: /home/chingting/Desktop/ONAP/dcae/dcae-inventory/dependency-reduced-pom.xml
[INFO] Dependency-reduced POM written at: /home/chingting/Desktop/ONAP/dcae/dcae-inventory/dependency-reduced-pom.xml
[INFO] Dependency-reduced POM written at: /home/chingting/Desktop/ONAP/dcae/dcae-inventory/dependency-reduced-pom.xml
[INFO]
[INFO] — docker-maven-plugin:0.4.11:build (build-image) @ dcae-inventory —
[INFO] Copying /home/chingting/Desktop/ONAP/dcae/dcae-inventory/target/dcae-inventory-1.1.0.jar -> /home/chingting/Desktop/ONAP/dcae/dcae-inventory/target/docker/opt/dcae-inventory-1.1.0.jar
[INFO] Building image dcae-inventory
May 14, 2017 7:00:36 PM org.apache.http.impl.execchain.RetryExec execute
INFO: I/O exception (java.io.IOException) caught when processing request to {}->unix://localhost:80: No such file or directory
May 14, 2017 7:00:36 PM org.apache.http.impl.execchain.RetryExec execute
INFO: Retrying request to {}->unix://localhost:80
May 14, 2017 7:00:36 PM org.apache.http.impl.execchain.RetryExec execute
INFO: I/O exception (java.io.IOException) caught when processing request to {}->unix://localhost:80: No such file or directory
May 14, 2017 7:00:36 PM org.apache.http.impl.execchain.RetryExec execute
INFO: Retrying request to {}->unix://localhost:80
May 14, 2017 7:00:36 PM org.apache.http.impl.execchain.RetryExec execute
INFO: I/O exception (java.io.IOException) caught when processing request to {}->unix://localhost:80: No such file or directory
May 14, 2017 7:00:36 PM org.apache.http.impl.execchain.RetryExec execute
INFO: Retrying request to {}->unix://localhost:80
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 29.620 s
[INFO] Finished at: 2017-05-14T19:00:36-07:00
[INFO] Final Memory: 40M/99M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal com.spotify:docker-maven-plugin:0.4.11:build (build-image) on project dcae-inventory: Exception caught: java.util.concurrent.ExecutionException: com.spotify.docker.client.shaded.javax.ws.rs.ProcessingException: java.io.IOException: No such file or directory -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException