How do I override the Nexus application port using an environment variable?

sunefred · November 29, 2022, 9:22pm

I need to be able to change the internal port used by Nexus Repository Manager, the Jetty server. And I unfortunately need to do this using an environment variable. I found a solution for this about a week ago that worked, but that is now gone from my memory.

I know about the file .\etc\nexus-default.properties

## DO NOT EDIT - CUSTOMIZATIONS BELONG IN $data-dir/etc/nexus.properties
##
# Jetty section
application-port=8081
application-host=0.0.0.0
nexus-args=${jetty.etc}/jetty.xml,${jetty.etc}/jetty-http.xml,${jetty.etc}/jetty-requestlog.xml
nexus-context-path=/

# Nexus section
nexus-edition=nexus-pro-edition
nexus-features=\
 nexus-pro-feature

nexus.hazelcast.discovery.isEnabled=true

I really need to do this using environment varibles though. I have tried the following without success

APPLICATION_PORT=80
NEXUS_APPLICATION_PORT=80
NEXUS_PROPERTIES_APPLICATION_PORT=80

From the source code I can clearly see that the ConfigurationBuilder uses EnvarBasedValueSource, which should mean that environment variables are loaded based on some naming convention.

github.com

sonatype/nexus-public/blob/c43280a44a1c9c3e00a23e21ed4e0ac6ab3046f1/components/nexus-bootstrap/src/main/java/org/sonatype/nexus/bootstrap/ConfigurationBuilder.java#L202


      
              return;
            }
            File file = new File(value).getCanonicalFile();
            properties.put(name, file.getPath());
          }
          
          
private void interpolate() throws Exception {
            Interpolator interpolator = new StringSearchInterpolator();
            interpolator.addValueSource(new MapBasedValueSource(properties));
            interpolator.addValueSource(new MapBasedValueSource(System.getProperties()));
            interpolator.addValueSource(new EnvarBasedValueSource());
          
          
  for (Entry<String, String> entry : properties.entrySet()) {
              properties.put(entry.getKey(), interpolator.interpolate(entry.getValue()));
            }
          }
          
          
public Map<String, String> build() throws Exception {
            if (properties.isEmpty()) {
              throw new IllegalStateException("Not configured");
            }

Does anybody know how this works?