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Release Notes for .NET Core 3.1 RPM packages
Abstract
Making open source more inclusive
Red Hat is committed to replacing problematic language in our code, documentation, and web properties. We are beginning with these four terms: master, slave, blacklist, and whitelist. Because of the enormity of this endeavor, these changes will be implemented gradually over several upcoming releases. For more details, see our CTO Chris Wright’s message.
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Chapter 1. Availability
Red Hat provides a distribution of .NET Core that enables developers to create applications using the C#, Visual Basic, and F# languages and then deploy them on Red Hat Enterprise Linux (RHEL), Red Hat OpenShift Container Platform, or other platforms. A no-cost Red Hat Enterprise Linux Developer Subscription is available, including a full suite of tools for container development.
The availability of .NET Core 3.1 allows Windows developers to deploy to RHEL without having to learn RHEL and to expand the reach of workloads to RHEL environments. The goal is to provide a safe introduction to a new environment and culture without risk of exposure. Now users of RHEL and RHEL-based Red Hat products can develop and run .NET Core applications directly on RHEL 7, RHEL 8, RHEL 9, including Red Hat Enterprise Linux Atomic Host and Red Hat OpenShift Container Platform.
RPM packages for .NET Core 3.1 are available on RHEL 7, RHEL 8, RHEL 9.
.NET Core 3.1 includes the following RPM packages that can be installed via yum install:
-
dotnet-sdk-3.1: includes the .NET Core 3.1 SDK and Runtime. -
dotnet-runtime-3.1: only the .NET Core 3.1 Runtime. If you want to use just the Runtime without the SDK, you should install this. aspnetcore-runtime-3.1: ASP.NET Core runtime. This includes the .NET Core runtime and the ASP.NET Core runtime. Install this package to run ASP.NET Core-based applications.Full instructions for installing .NET Core 3.1 on RHEL 9 are available in the Getting started with .NET on RHEL 9 guide.
Chapter 2. Overview
.NET Core is a general purpose, modular, cross-platform, and open source implementation of .NET that features automatic memory management and modern programming languages. It allows users to build high-quality applications efficiently. .NET Core is available on RHEL 7, RHEL 8, RHEL 9.
This release of .NET Core is a long-term supported (LTS) release. For more information, see the Life Cycle and Support Policies for the .NET Core Program.
.NET Core offers:
- The ability to follow a microservices-based approach, where some components are built with .NET and others with Java, but all can run on a common, supported platform in RHEL.
- The capacity to more easily develop new .NET Core workloads on Microsoft Windows. You can deploy and run on either RHEL or Windows Server.
- A heterogeneous data center, where the underlying infrastructure is capable of running .NET applications without having to rely solely on Windows Server.
Chapter 3. Features and benefits
3.1. Current features and benefits
.NET Core 3.1 offers the following features and benefits.
Runtime and framework libraries
.NET Core consists of the CoreCLR runtime and the CoreFX framework libraries as well as compilers, build tools, tools to fetch NuGet packages, and a command-line interface to tie everything together. Benefits include:
- Automatic memory management
- Type safety
- Delegates and lambdas
- Generic types
- Language Integrated Query (LINQ)
- Async programming
- Native interoperability
.NET Core 3.1 supports developing applications using ASP.NET Core 3.1 and EF Core 3.1, which bring benefits such as:
- Lightweight and modular HTTP request pipeline
- Ability to host on a web server or self-host in your own process
- Built on .NET Core, which supports true side-by-side app versioning
- Integrated support for creating and using NuGet packages
- Single aligned web stack for web UI and web APIs
- Cloud-ready environment-based configuration
- Built-in support for dependency injection
- Tools that simplify modern web development
3.2. New features and benefits
.NET Core 3.1 continues to broaden its support and tools for application development in an open source environment. The latest version of .NET Core includes the following improvements:
- Support for C# 8.0
- Support for F# 4.7
- Support for building Windows Desktop applications
-
Supports
netstandard2.1 - Local tools
-
Using perf-oriented CPU instructions (
System.Runtime.Intrinsics) - Native executables for framework-dependent applications
- Single-file executables
- Trimming applications on publish
- Ahead-of-time (AOT) compiled applications
- IEEE floating-point improvements
- Fast built-in JSON support
-
Improved native interop using
NativeLibrary -
HTTP/2 support in
HttpClient - TPS 1.3 support on Linux systems with OpenSSL 1.1.1
-
SerialPortsupport on Linux - Improved GC behavior in containers with small memory allocation, systems with more than 64 processors
- (Experimental) Huge page support
- ARM64 support for IoT scenarios
- Cross-platform diagnostic tools
- Support for building client-side web apps using Blazor
- Create high-performance backend services with gRPC
- HTTP/2 enabled by default in Kestrel
- New worker service template for building long-running services
-
Authentication support integration with
IdentityServer
Chapter 4. Supported operating systems and architectures
.NET Core 3.1 is available for the following operating systems and architectures:
- RHEL 9 x86_64 and aarch64
- RHEL 8 x86_64
- RHEL 7 x86_64 Server and Workstation
- HPC Compute Node
- Red Hat Enterprise Atomic Host
- OpenShift Container Platform
The .NET Core platform comprises runtime, library, and compiler components. As a developer, you have the flexibility to use the components in numerous configurations for device and cloud workloads.
Chapter 5. Customer privacy
Various Microsoft products have a feature that reports usage statistics, analytics, and various other metrics to Microsoft over the network. Microsoft calls this Telemetry. Red Hat is disabling telemetry because we do not recommend sending customer data to anyone without explicit permission.
As part of installing .NET on Red Hat Enterprise Linux 9, we automatically set an environment variable that tells the CLI to disable its telemetry reporting. Any customer that runs .NET Core 3.1 will not report telemetry information to Microsoft. This helps keep customer information confidential.
Customers can enable telemetry by setting the environment variable DOTNET_CLI_TELEMETRY_OPTOUT to 0. See .NET Core Tools Telemetry collection for more information.
Chapter 6. Support
Red Hat and Microsoft are committed to providing excellent support for .NET Core and are working together to resolve any problems that occur on Red Hat supported platforms. At a high level, Red Hat supports the installation, configuration, and running of the .NET Core component in Red Hat Enterprise Linux (RHEL). Red Hat can also provide "commercially reasonable" support for issues we can help with, for instance, NuGet access problems, permissions issues, firewalls, and application questions. If the issue is a defect or vulnerability in .NET Core, we actively work with Microsoft to resolve it.
.NET Core 3.1 is supported on RHEL 7, RHEL 8, RHEL 9, and Red Hat OpenShift Container Platform versions 3.3 and later.
See .NET Core Life Cycle for information about the .NET Core support policy
6.1. Contact options
There are a couple of ways you can get support, depending on how you are using .NET Core.
- If you are using .NET Core on-premises, you can contact either Red Hat Support or Microsoft directly.
- If you are using .NET Core in Microsoft Azure, you can contact either Red Hat Support or Azure Support to receive Integrated Support.
Integrated Support is a collaborative support agreement between Red Hat and Microsoft. Customers using Red Hat products in Microsoft Azure are mutual customers, so both companies are united to provide the best troubleshooting and support experience possible.
6.2. Frequently asked questions
Here are four of the most common support questions for Integrated Support.
When do I access Integrated Support?
You can engage Red Hat Support directly. If the Red Hat Support Engineer assigned to your case needs assistance from Microsoft, the Red Hat Support Engineer will collaborate with Microsoft directly without any action required from you. Likewise on the Microsoft side, they have a process for directly collaborating with Red Hat Support Engineers.
What happens after I file a support case?
Once the Red Hat support case has been created, a Red Hat Support Engineer will be assigned to the case and begin collaborating on the issue with you and your Microsoft Support Engineer. You should expect a response to the issue based on Red Hat’s Production Support Service Level Agreement.
What if I need further assistance?
Contact Red Hat Support for assistance in creating your case or with any questions related to this process. You can view any of your open cases here.
How do I engage Microsoft for support for an Azure platform issue?
If you have support from Microsoft, you can open a case using whatever process you typically would follow. If you do not have support with Microsoft, you can always get support from Microsoft Support.
6.3. Additional support resources
The Resources page at Red Hat Developers provides a wealth of information, including:
- Getting started documents
- Knowledgebase articles and solutions
- Blog posts
.NET Core documentation is hosted on a Microsoft website. Here are some additional topics to explore:
You can also see more support policy information at Red Hat and Microsoft Azure Certified Cloud & Service Provider Support Policies.
Chapter 7. Known issues
The known issues for running .NET Core on Red Hat Enterprise Linux (RHEL) include the following:
- .NET Core only runs on RHEL 7.x, RHEL 8.x, and RHEL 9.x; it does not run on earlier versions of RHEL.
dotnet dev-certs https --trustdoes not work on RHEL..NET Core supports the creation of HTTPS certificate through
dotnet dev-certs https, but it does not support trusting them throughdotnet dev-certs https --trust. The client that connects to the ASP.NET Core application, such ascurlor Firefox, will warn about the untrusted self-signed certificate. To work around this in a browser such as Firefox, ignore the warning and trust the certificate explicitly when the warning about the untrusted certificate comes up. Command-line tools support flags to ignore untrusted certificates. Forcurl, use the--insecureflag. Forwget, use the--no-check-certificateflag.There are different values for math libraries on different platforms.
Math libraries that are part of .NET Core 3.1 can return different values on different platforms. This is expected behavior. .NET Core 3.1 takes advantage of the platform-specific libraries to improve performance and reduce overhead. See the Math.Cos(double.MaxValue) returns different values on Windows and other platforms issue discussion for more information.
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