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https://github.com/falox/csharp-operator-sdk
Build Kubernetes operators with C# and .NET Core
https://github.com/falox/csharp-operator-sdk
csharp dotnet-core dotnetcore kubernetes kubernetes-operator
Last synced: about 2 months ago
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Build Kubernetes operators with C# and .NET Core
- Host: GitHub
- URL: https://github.com/falox/csharp-operator-sdk
- Owner: falox
- License: apache-2.0
- Created: 2020-09-23T15:56:13.000Z (almost 4 years ago)
- Default Branch: master
- Last Pushed: 2020-11-14T10:40:05.000Z (almost 4 years ago)
- Last Synced: 2024-06-29T07:21:34.186Z (3 months ago)
- Topics: csharp, dotnet-core, dotnetcore, kubernetes, kubernetes-operator
- Language: C#
- Homepage:
- Size: 138 KB
- Stars: 16
- Watchers: 4
- Forks: 4
- Open Issues: 5
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
- awesome-kubernetes-operator-resources - Csharp-operator-sdk - Build Kubernetes operators with C# and .NET Core. (Operator Frameworks)
README
[](https://github.com/falox/csharp-operator-sdk/actions?query=workflow%3A%22.NET+Core%22)
[](https://www.nuget.org/packages/k8s.Operators)
[](https://coveralls.io/github/falox/csharp-operator-sdk?branch=master)
# C# Operator SDK
The C# Operator SDK is a framework to build [Kubernetes operators](https://kubernetes.io/docs/concepts/extend-kubernetes/operator/) with C# and .NET Core.
## Features
- Easy custom resource and controller definition as C# classes
- Custom resource event watchers at namespace and cluster scope
- [Configurable retry-on-failure](https://github.com/falox/csharp-operator-sdk/blob/f989ab3ad5fdf322f681c863052338c982680bc5/samples/basic/deploy/operator.yaml#L27) policy
- Smart concurrent event queues (inspired by [Container Solution](https://blog.container-solutions.com/a-deep-dive-into-the-java-operator-sdk)'s article)
- Kubernetes [graceful termination policy](https://github.com/falox/csharp-operator-sdk/blob/f989ab3ad5fdf322f681c863052338c982680bc5/samples/basic/Program.cs#L89) support
## Usage
Setup a new [.NET Core 3.1](https://dotnet.microsoft.com/download/dotnet-core/3.1) project and add the [C# Operator SDK package](https://www.nuget.org/packages/k8s.Operators):
```bash
dotnet new console
dotnet add package k8s.Operators
```
Assuming that you have already added a custom resource definition for `MyResource` in your Kubernetes cluster, define a class deriving from `CustomResource` for the custom resource schema:
```csharp
// Set the CRD attributes
[CustomResourceDefinition("example.com", "v1", "myresources")]
public class MyResource : CustomResource
{
// Define spec
public class MyResourceSpec
{
public int property1 { get; set; }
// :
}
// Define status
public class MyResourceStatus
{
public int property2 { get; set; }
// :
}
}
```
Define a class deriving from `Controller` for the controller logic:
```csharp
public class MyResourceController : Controller
{
public MyResourceController(OperatorConfiguration configuration, IKubernetes client, ILoggerFactory loggerFactory = null)
: base(configuration, client, loggerFactory)
{
}
protected override async Task AddOrModifyAsync(MyResource resource, CancellationToken cancellationToken)
{
Console.WriteLine($"Add/Modify {resource}");
// :
// Handle Add/Modify event
}
protected override async Task DeleteAsync(MyResource resource, CancellationToken cancellationToken)
{
Console.WriteLine($"Delete {resource}");
// :
// Handle Delete event
}
}
```
Setup the operator in `Main()`:
```csharp
static async Task Main(string[] args)
{
// Create the Kubernetes client
using var client = new Kubernetes(KubernetesClientConfiguration.BuildConfigFromConfigFile());
// Setup the operator
var @operator = new Operator(OperatorConfiguration.Default, client);
@operator.AddControllerOfType();
// Start the operator
return await @operator.StartAsync();
}
```
> Curiosity: Since `operator` is a reserved keyword in C#, it has been escaped with `@operator`.
Start the operator with:
```bash
dotnet run
```
In the `/samples/basic` directory you find a [sample operator](./samples/basic/README.md) that simulates the interaction with an external service and can be used as a template for real-world operators.
[Follow the instructions](./samples/basic/README.md) to run it locally and deploy it to Kubernetes.
## Compiling the source code
```bash
git clone https://github.com/falox/csharp-operator-sdk.git
cd csharp-operator-sdk
dotnet restore
dotnet build
```
Running the tests:
```bash
dotnet test
```
## References
- Jason Dobies and Joshua Wood, [Kubernetes Operators](https://www.oreilly.com/library/view/kubernetes-operators/9781492048039/), O'Reilly, 2020
- Radu Matei, [Writing controllers for Kubernetes CRDs with C#](https://radu-matei.com/blog/kubernetes-controller-csharp/), 2019