https://github.com/trstringer/k8s-controller-custom-resource
Base sample for a custom controller in Kubernetes working with custom resources
https://github.com/trstringer/k8s-controller-custom-resource
kubernetes kubernetes-controllers
Last synced: 10 months ago
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Base sample for a custom controller in Kubernetes working with custom resources
- Host: GitHub
- URL: https://github.com/trstringer/k8s-controller-custom-resource
- Owner: trstringer
- Created: 2018-04-18T02:08:28.000Z (almost 8 years ago)
- Default Branch: master
- Last Pushed: 2018-05-21T11:35:12.000Z (over 7 years ago)
- Last Synced: 2025-04-02T13:04:46.861Z (10 months ago)
- Topics: kubernetes, kubernetes-controllers
- Language: Go
- Homepage:
- Size: 29.3 KB
- Stars: 64
- Watchers: 1
- Forks: 355
- Open Issues: 3
-
Metadata Files:
- Readme: README.md
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README
# Kubernetes Custom Controller - Custom Resource Handling
**Note**: the source code is _verbosely_ commented, so the source is meant to be read and to teach
## What is this?
An example of a custom Kubernetes controller that's only purpose is to watch for the creation, updating, or deletion of all custom resource of type `MyResource` (in the all namespaces). This was created as an exercise to understand how Kubernetes controllers work and interact with the cluster and resources.
## Running
```
$ git clone https://github.com/trstringer/k8s-controller-custom-resource
$ cd k8s-controller-custom-resource
$ go run *.go
```
## Inspecting resources in the handler
You are welcome to dump the resources themselves in handler but logging would be extremely verbose (and not interactive). I recommend you use a debugger...
```
$ dlv debug
(dlv) b main.ObjectCreated
(dlv) c
```
You can then trigger an event by creating a deployment of nginx...
```
$ kubectl apply -f example/example-myresource.yaml
```
The breakpoint should be hit and you can analyze in the debugger the object...
```
(dlv) p obj
```