macOS Server is changing to focus more on management of computers, devices, and storage on your network. As a result, some changes are coming in how Server works. Beginning in the spring of 2018, several services will be hidden on new installations of an update to macOS Server. Then in the fall of 2018, new installations and upgrades of macOS Server will require you to migrate most services to other software.
This guide is designed to assist those administrators comfortable with installing and maintaining open source projects to migrate their service data to the underlying open-source project that was previously bundled with macOS Server. Others may want to migrate to cloud-based solutions from third-party vendors. For more information, see the Apple Support article, Prepare for changes to macOS Server at https://support.apple.com/HT208312.