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.NET

This guide explains how to create and deploy a simple .NET-based HTTP web server. To run this example, follow these steps:

  1. Install the kraft CLI tool and a container runtime engine, for example Docker.

  2. Clone the examples repository and cd into the examples/http-dotnet8.0/ directory:

Code(bash)
 
git clone https://github.com/kraftcloud/examples
cd examples/http-dotnet8.0/

Make sure to log into Unikraft Cloud by setting your token and a metro close to you. This guide uses fra (Frankfurt, 🇩🇪):

Code(bash)
 
# Set Unikraft Cloud access token
export UKC_TOKEN=token
# Set metro to Frankfurt, DE
export UKC_METRO=fra

When done, invoke the following command to deploy this app on Unikraft Cloud:

Code(bash)
 
kraft cloud deploy -p 443:8080 -M 512 .

The output shows the instance address and other details:

Code(ansi)
 
[●] Deployed successfully!
 │
 ├────────── name: http-dotnet80-dsmkh
 ├────────── uuid: 25459494-cb43-4009-9d05-f0996de5b7e4
 ├───────── state: starting
 ├─────────── url: cold-fog-hl98aw6q.fra.unikraft.app
 ├───────── image: http-dotnet80@sha256:4fad7453995ae96b636696e9929ee0e7376bfbbd63ab9698c1f1e02602aa2575
 ├──────── memory: 512 MiB
 ├─────── service: cold-fog-hl98aw6q
 ├── private fqdn: http-dotnet80-dsmkh.internal
 ├──── private ip: 172.16.3.1
 └────────── args: /usr/bin/app/src

In this case, the instance name is http-dotnet80-dsmkh and the address is https://cold-fog-hl98aw6q.fra.unikraft.app. They're different for each run.

Use curl to query the Unikraft Cloud instance of the .NET-based HTTP web server:

Code(bash)
 
curl https://cold-fog-hl98aw6q.fra.unikraft.app
Code(text)
 
Hello, World!

You can list information about the instance by running:

Code(bash)
 
kraft cloud instance list
Code(text)
 
NAME                 FQDN                                    STATE    CREATED AT     IMAGE                                  MEMORY   ARGS                                                      BOOT TIME
http-dotnet80-dsmkh  cold-fog-hl98aw6q.fra.unikraft.app       running  2 minutes ago  http-dotnet80@sha256:4fad7453995ae...  512 MiB  /usr/bin/app/src                                          328.69 ms

When done, you can remove the instance:

Code(bash)
 
kraft cloud instance remove http-dotnet80-dsmkh

Customize your app

To customize the app, update the files in the repository, listed below:

  • SimpleHttpServer.cs: the actual .NET HTTP server
  • Kraftfile: the Unikraft Cloud specification
  • Dockerfile: the Docker-specified app filesystem

Lines in the Kraftfile have the following roles:

  • spec: v0.6: The current Kraftfile specification version is 0.6.

  • runtime: base-compat:latest: The runtime kernel to use is the base compatibility kernel.

  • rootfs: ./Dockerfile: Build the app root filesystem using the Dockerfile.

  • cmd:: Use as the starting command of the instance.

Lines in the Dockerfile have the following roles:

  • WORKDIR /src: Use the /src directory as the working directory.

  • RUN dotnet new console: Create a new dotnet project.

  • RUN rm Program.cs: Remove template source code file.

  • COPY ./SimpleHttpServer.cs .: Copy the source code of the HTTP server.

  • RUN dotnet build .: Build dotnet project.

  • FROM scratch: Build the filesystem from the scratch container image, to create a base image.

  • COPY --from=build ...: Copy on the required files from the filesystem: the binary executable, the .NET framework files and the binary library files.

The following options are available for customizing the app:

  • If you only update the implementation in the SimpleHttpServer.rs source file, you don't need to make any other changes.

  • If you create any new source files, copy them into the app filesystem by using the COPY command in the Dockerfile.

  • More extensive changes may require extending the Dockerfile (see Dockerfile syntax reference).

Learn more

Use the --help option for detailed information on using Unikraft Cloud:

Code(bash)
 
kraft cloud --help

Or visit the CLI Reference.

Last modified on
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