What are Go and embedded kubernetes (k3s, microk8s)?

Question

Accepted Answer

Embedded kubernetes is **lightweight Kubernetes distributions** for development and edge.

```bash
# K3s: lightweight Kubernetes
curl -sfL https://get.k3s.io | sh -

# MicroK8s: from Canonical
snap install microk8s --classic

# Check
kubectl get nodes
kubectl get pods -A

# Go client for management
go get k8s.io/client-go
go get k8s.io/apimachinery
```

```go
// Go program for managing k3s
package main

import (
    "context"
    "fmt"
    "k8s.io/client-go/kubernetes"
    "k8s.io/client-go/tools/clientcmd"
)

func main() {
    // K3s uses the same kubeconfig
    config, err := clientcmd.BuildConfigFromFlags("",
        "/etc/rancher/k3s/k3s.yaml")
    if err != nil {
        log.Fatal(err)
    }

clientset, _ := kubernetes.NewForConfig(config)

// Works like regular Kubernetes
    pods, _ := clientset.CoreV1().Pods("").List(
        context.Background(),
        metav1.ListOptions{},
    )

for _, pod := range pods.Items {
        fmt.Printf("Pod: %s/%s
", pod.Namespace, pod.Name)
    }
}
```

**Comparison:**
- K3s: <100MB, for edge and IoT.
- MicroK8s: for development and testing.
- Minikube: virtual machine.

Go: What are Go and embedded kubernetes (k3s, microk8s)?