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main.go
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main.go
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package main
import (
"fmt"
"log"
"os/user"
"path/filepath"
"strings"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/ec2"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
)
func getConfig() (*rest.Config, error) {
// Try the in-cluster config
if c, err := rest.InClusterConfig(); err == nil {
return c, nil
}
// If no in-cluster config, try the default location in the user's home directory
if usr, err := user.Current(); err == nil {
if c, err := clientcmd.BuildConfigFromFlags("", filepath.Join(usr.HomeDir, ".kube", "config")); err == nil {
return c, nil
}
}
return nil, fmt.Errorf("could not locate a kubeconfig")
}
func hasReadyCondition(conditions []corev1.NodeCondition) bool {
for _, condition := range conditions {
if condition.Type == corev1.NodeReady {
if condition.LastHeartbeatTime.After(time.Now().Add(-30 * time.Second)) {
return true
}
}
}
return false
}
func shouldRemoveNode(node corev1.Node) bool {
providerID := node.Spec.ProviderID
parsedProviderID := strings.Split(providerID, "/")
region := node.Labels["failure-domain.beta.kubernetes.io/region"]
instanceID := parsedProviderID[len(parsedProviderID)-1]
svc := ec2.New(session.Must(session.NewSession(&aws.Config{
Region: aws.String(region),
})))
result, err := svc.DescribeInstanceStatus(&ec2.DescribeInstanceStatusInput{
InstanceIds: []*string{
aws.String(instanceID),
},
})
if err != nil {
if aerr, ok := err.(awserr.Error); ok {
if aerr.Code() == "InvalidInstanceID.NotFound" {
return true
}
}
log.Println(err)
} else if len(result.InstanceStatuses) == 0 {
return true
}
return false
}
func main() {
config, err := getConfig()
if err != nil {
panic(err.Error())
}
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
panic(err.Error())
}
for {
nodes, err := clientset.CoreV1().Nodes().List(metav1.ListOptions{})
if err != nil {
panic(err.Error())
}
for _, node := range nodes.Items {
if !hasReadyCondition(node.Status.Conditions) {
if shouldRemoveNode(node) {
log.Printf("Removing node %s\n", node.Name)
clientset.CoreV1().Nodes().Delete(node.Name, &metav1.DeleteOptions{})
} else {
log.Printf("Node %s seems unresponsive, but alive\n", node.Name)
}
}
}
time.Sleep(10 * time.Second)
}
}