How to downgrade from Nexus 3 Pro to Nexus 3 OSS or Community Edition (CE)

To downgrade a Nexus Repository Manager (NXRM) 3 PRO instance to OSS or Community Edition (CE):

1. Go to Administration -> Security -> Realms. If there are any PRO ONLY Active realms, remove these realms from the Active realm list and save.
2. Gracefully stop the Nexus Repository process.
3. Open the file <data-dir>/etc/nexus.properties in a text editor.
4. Add a new line to the file containing:

   nexus.loadAsOSS=true

5. Save the file with read permissions and ownership of the user owning the NXRM process.
6. Required for versions 3.10.0 to 3.14.0 only:
   • This step is not needed for versions 3.9.0 or earlier or 3.15.0 and later.
   • You will need to modify the DB paths in the script before executing it.
   1. Download the attached downgrade.osql script to your <app-dir>.
   2. Open the downgrade.osql script in a text editor and modify the path references inside the script to refer to the correct locations.
   3. In a terminal session, change directories to the <app-dir> and execute the script using a java command:

      java -jar ./lib/support/nexus-orient-console.jar downgrade.osql

7. Start NXRM

Note: In a container environment you can pass "nexus.loadAsOSS=true" in using the INSTALL4J_ADD_VM_PARAMS environment variable::

$ docker run -d -p 8081:8081 --name nexus -e INSTALL4J_ADD_VM_PARAMS="-Dnexus.loadAsOSS=true -Xms2703m -Xmx2703m -XX:MaxDirectMemorySize=2703m -Djava.util.prefs.userRoot=/some-other-dir" sonatype/nexus3

Note about Plugins

If any custom plugins were installed whilst on the PRO edition and they were installed by making changes to the <nexus_dir>/system/com/sonatype/nexus/assemblies/nexus-pro-feature directory, then to continue using these plugins on the OSS edition, you will need to make the equivalent install changes to the <nexus_dir>/system/com/sonatype/nexus/assemblies/nexus-oss-feature directory. Please consult the specific plugin's install instructions for further details.