Repository Management with Nexus

1.3. Nexus Professional

Nexus Professional was designed to meet the needs of the enterprise. It is a central point of access to external repositories which provides the necessary controls to make sure that only approved artifacts enter into your software development environment. It is also a central distribution point with the intelligence required to support the decision that go into making quality software. The extensibility provided by the custom metadata plugin coupled with REST services only available in Nexus Professional also lay the foundation for highly complex interactions within the enterprise. Once you start to use the workflow and decision support features of Nexus Professional, you will start to see it as the "assembly line" — the central collaboration point for your software development efforts.

1.3.1. Nexus Professional Features

Nexus Procurement Suite
Consider the default behavior of a proxy repository. Any developer can reference any artifact stored in a remote repository and cause Nexus to retrieve the artifact from the remote repository and serve back to a developer. Very often a company might want to control the set of artifacts which can be referenced in a proxy repository. Maybe the company has unique security requirements which require every third-party library to be subjected to a rigorous security audit before they can used. Or, maybe another company has a legal team which needs to verify that every artifact referenced by your software adheres to an inflexible set of license guidelines. The Nexus Procurement Suite was design to give organizations this level of control over the artifacts that can be served from Nexus.
Nexus Staging Suite
When was the last time you did a software release to a production system? Did it involve a QA team that had to sign off on a particular build? What was the process you used to re-deploy a new build if QA found a problem with the system at the last minute? Because few organizations use a mature process to manage binary software artifacts, there is little in the way of infrastructure designed to keep track of the output of a build. The Nexus Staging Suite changes this by providing workflow support for binary software artifacts. If you need to create a release artifact and deploy it to a hosted repository, you can use the Staging Suite to post a collection of related, staged artifacts which can be tested, promoted, or discarded as a unit. Nexus keeps track of the individuals who are involved in a staged, managed release and can be used to support the decisions that go into producing quality software.
Support for OSGi Repositories
Instead of just supporting Maven repositories, Nexus Professional supports OSGi Bundle repositories and P2 repositories for those developers who are targeting OSGi or the Eclipse platform. Just like you can proxy, host, and group Maven repositories, Nexus Professional allows you to do the same with OSGi repositories.
Enterprise LDAP Support
Nexus Professional offers LDAP support features for enterprise LDAP deployments, including detailed configuration of cache parameters, support for multiple LDAP servers and backup mirrors, the ability to test user logins, support for common user/group mapping templates, and the ability to support more than one schema across multiple servers.
Support for Atlassian Crowd
If your organization uses Atlassian Crowd, Nexus Professional can delegate authentication and access control to a Crowd server and map Crowd groups to the appropriate Nexus roles.
Maven Settings Management
Nexus Professional along with the Nexus M2Settings Maven Plugin allows you to manage Maven settings. Once you have developed a Maven Settings template, developers can then connect to Nexus Professional using the Nexus M2Settings Maven plugin which will take responsibility for downloading a Maven settings file from Nexus and replacing the existing Maven settings on a local workstation.
Support for Artifact Bundles
When software is deployed to the Maven Central repository, it is deployed as a signed artifact bundle. Nexus Professional’s Staging Suite allows you to upload artifact bundles to a staged repository.
Artifact Validation and Verification
The software artifacts you download from a remote repository are often signed with PGP signatures. Nexus Professional will make sure that these PGP signatures are valid and the procurement plugin defines a few other rules that can be applied to artifacts which are downloaded from remote repositories. Nexus Professional also defines an API which allows you to create your own custom verification rules.
Custom Repository Metadata
Nexus Professional provides a facility for user-defined, custom metadata. If you need to keep track of custom attributes to support approval workflow or to associate custom identifiers with software artifacts, you can use Nexus to define and manipulate custom attributes which can be associated with artifacts in a Nexus repository.

1.3.2. Nexus Professional License

Nexus Professional is made available under a commercial license for businesses. Is is available at no charge for use in qualifying Open Source projects and is available at a discount for select nonprofits.