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.Net Docker image

This repository contains the source for building .Net applications as a reproducible Docker image using source-to-image. The resulting image can be run using Docker.

Usage

To build a simple dotnet-sample-app application using standalone S2I and then run the resulting image with Docker execute:

```
$ sudo s2i build git://github.com/redhat-developer/s2i-dotnetcore --context-dir=2.0/build/test/asp-net-hello-world dotnet/dotnet-20-rhel7 dotnet-sample-app
$ sudo docker run -p 8080:8080 dotnet-sample-app
```

Accessing the application:

HTTP:

$ curl http://127.0.0.1:8080

Repository organization

  • Dockerfile.rhel7

    RHEL based Dockerfile. In order to perform build or test actions on this Dockerfile you need to run the action on a properly subscribed RHEL machine.

  • Dockerfile

    CentOS based Dockerfile.

  • root/usr/bin/

    This folder contains common scripts.

  • s2i/bin/

    This folder contains scripts that are run by S2I:

    • assemble

      Used to install the sources into the location where the application will be run and prepare the application for deployment

    • run

      This script is responsible for running the application

    • usage

      This script prints the usage of this image.

  • contrib/

    This folder contains scripts under the app source tree.

  • test/

    This folder contains S2I dotnet sample applications.

    • helloworld/

      .Net Core "Hello World" used for testing purposes by the S2I test framework.

    • qotd/

      .Net Core Quote of the Day example app used for testing purposes by the S2I test framework.

    • asp-net-hello-world/

      ASP .Net hello world example app used for testing purposes by the S2I test framework.

    • asp-net-hello-world-envvar/

      ASP .Net hello world example app used for testing purposes by the S2I test framework.

Environment variables

To set these environment variables, you can place them as a key value pair into a .s2i/environment file inside your source code repository.

  • DOTNET_STARTUP_PROJECT

    Used to select the project to run. This must be a project file (e.g. csproj, fsproj) or a folder containing a single project file. Defaults to ..

  • DOTNET_SDK_VERSION

    Used to select the default sdk version when building. If there is a global.json file in the source repository, that takes precedence. When set to latest the latest sdk in the image is used. Defaults to the lowest sdk version available in the image.

  • DOTNET_ASSEMBLY_NAME

    Used to select the assembly to run. This must NOT include the .dll extension. Set this to the output assembly name specified in the project file (PropertyGroup/AssemblyName). This defaults to the project filename.

  • DOTNET_RESTORE_SOURCES

    Used to specify the list of NuGet package sources used during the restore operation. This overrides all of the sources specified in the NuGet.config file.

  • DOTNET_NPM_TOOLS

    Used to specify a list of npm packages to install before building the app. Defaults to ``.

  • DOTNET_TEST_PROJECTS

    Used to specify the list of test projects to run. This must be project files or folders containing a single project file. dotnet test is invoked for each item. Defaults to ``.

  • DOTNET_VERBOSITY

    Used to specify the verbosity of the dotnet build commands. When set, the environment variables are printed at the start of the build. This variable can be set to one of the msbuild verbosity values (q[uiet], m[inimal], n[ormal], d[etailed], and diag[nostic]). Defaults to ``.

  • DOTNET_CONFIGURATION

    Used to run the application in Debug or Release mode. This should be either Release or Debug. This is passed to the dotnet publish invocation. Defaults to Release.

  • ASPNETCORE_URLS

    This variable is set to http://*:8080 to configure ASP.NET Core to use the port exposed by the image.

  • HTTP_PROXY, HTTPS_PROXY

    Configures the HTTP/HTTPS proxy used when building and running the application.

  • NPM_MIRROR

    Use a custom NPM registry mirror to download packages during the build process.

  • DOTNET_ASPNET_STORE

    Publish assuming the runtime image contains the ASP.NET Core runtime store. Defaults to false.

  • DOTNET_PACK

    When set to true creates a tar.gz file at /opt/app-root/app.tar.gz that contains the published application.

  • DEV_MODE

    When set to true, the application restart automatically when the source code changes. dotnet run is used to start the application.

  • DOTNET_SDK_BASE_VERSION

    Contains the lowest sdk version available in the image. This is used as the default value for DOTNET_SDK_VERSION.

  • DOTNET_USE_POLLING_FILE_WATCHER

    This is set to true to ensure the dotnet watch command works in a container. This command is not used by the default scripts.

NPM

Typical modern web applications rely on javascript tools to build the front-end. The image includes npm (node package manager) to install these tools. Packages can be installed by setting DOTNET_NPM_TOOLS and by calling npm install in the build process.