.NET Core 2.1 RC 1 is out now, and officials say it's ready for widespread testing and production use.
Using .NET Core 2.1 RC 1 on Windows, macOS and Linux platforms
.NET Core 2.1 RC 1 SDK (includes the runtime)
Starting with .NET Core 2.1 RC 1, official support has been added for Alpine Linux, a very small, security-focused Linux distribution and a very popular image in Docker.
Additionally, .NET Core now supports Linux ARM32 distributions such as Raspbian and Ubuntu.
Detailed release notes: https://github.com/dotnet/core/blob/master/release-notes/2.1/Preview/2.1.0-rc1.md
Release homepage: https://blogs.msdn.microsoft.com/ dotnet/2018/05/07/announcing-net-core-2-1-rc-1/