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ebs-mount.go
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ebs-mount.go
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package main
import (
"context"
"encoding/json"
"fmt"
"log"
"strings"
"time"
"github.com/aws/aws-sdk-go/aws"
"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"
types "k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/kubernetes"
)
func volumeInUse(volumeName corev1.UniqueVolumeName, node *corev1.Node) bool {
for _, name := range node.Status.VolumesInUse {
if name == volumeName {
return true
}
}
return false
}
func deviceNameInUse(dev string, node *corev1.Node) bool {
for _, volume := range node.Status.VolumesAttached {
if volume.DevicePath == dev {
return true
}
}
return false
}
func volumeAttached(volumeName corev1.UniqueVolumeName, node *corev1.Node) bool {
for _, volume := range node.Status.VolumesAttached {
if volume.Name == volumeName {
return true
}
}
return false
}
func freeDeviceName(node *corev1.Node) (string, error) {
for _, firstChar := range []rune{'b', 'c'} {
for i := 'a'; i <= 'z'; i++ {
dev := "/dev/xvd" + string([]rune{firstChar, i})
if !deviceNameInUse(dev, node) {
return dev, nil
}
}
}
return "", fmt.Errorf("all device names are in use")
}
func attachEBSVolume(volumeName corev1.UniqueVolumeName, node *corev1.Node) (string, error) {
providerID := node.Spec.ProviderID
parsedProviderID := strings.Split(providerID, "/")
parsedVolumeID := strings.Split(string(volumeName), "/")
region := node.Labels["failure-domain.beta.kubernetes.io/region"]
instanceID := parsedProviderID[len(parsedProviderID)-1]
volumeID := parsedVolumeID[len(parsedVolumeID)-1]
svc := ec2.New(session.Must(session.NewSession(&aws.Config{
Region: aws.String(region),
})))
ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
defer cancel()
res, err := svc.DescribeVolumesWithContext(ctx, &ec2.DescribeVolumesInput{
VolumeIds: []*string{
aws.String(volumeID),
},
})
if err != nil {
return "", err
}
if len(res.Volumes) == 1 &&
len(res.Volumes[0].Attachments) == 1 && res.Volumes[0].Attachments[0].InstanceId != nil &&
res.Volumes[0].Attachments[0].Device != nil &&
*res.Volumes[0].Attachments[0].InstanceId == instanceID {
log.Printf("Volume %s is already attached\n", volumeName)
return *res.Volumes[0].Attachments[0].Device, nil
}
deviceName, err := freeDeviceName(node)
if err != nil {
return "", err
}
_, err = svc.AttachVolumeWithContext(ctx, &ec2.AttachVolumeInput{
InstanceId: aws.String(instanceID),
VolumeId: aws.String(volumeID),
Device: aws.String(deviceName),
})
return deviceName, err
}
func detachEBSVolume(volumeName corev1.UniqueVolumeName, node *corev1.Node) error {
providerID := node.Spec.ProviderID
parsedProviderID := strings.Split(providerID, "/")
parsedVolumeID := strings.Split(string(volumeName), "/")
region := node.Labels["failure-domain.beta.kubernetes.io/region"]
instanceID := parsedProviderID[len(parsedProviderID)-1]
volumeID := parsedVolumeID[len(parsedVolumeID)-1]
svc := ec2.New(session.Must(session.NewSession(&aws.Config{
Region: aws.String(region),
})))
ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
defer cancel()
res, err := svc.DescribeVolumesWithContext(ctx, &ec2.DescribeVolumesInput{
VolumeIds: []*string{
aws.String(volumeID),
},
})
if err != nil {
return err
}
if len(res.Volumes) == 1 && res.Volumes[0].State != nil && *res.Volumes[0].State == "available" {
log.Printf("Volume %s is already detached\n", volumeName)
return nil
}
if len(res.Volumes) == 1 &&
len(res.Volumes[0].Attachments) == 1 && res.Volumes[0].Attachments[0].InstanceId != nil &&
res.Volumes[0].Attachments[0].Device != nil &&
*res.Volumes[0].Attachments[0].InstanceId != instanceID {
log.Printf("Volume %s is attached to other instance\n", volumeName)
return nil
}
_, err = svc.DetachVolumeWithContext(ctx, &ec2.DetachVolumeInput{
InstanceId: aws.String(instanceID),
VolumeId: aws.String(volumeID),
})
return err
}
func addVolumeToNode(clientset *kubernetes.Clientset, volumeName corev1.UniqueVolumeName, deviceName string, node *corev1.Node) error {
patchData, err := json.Marshal([]map[string]interface{}{
map[string]interface{}{
"op": "replace",
"path": "/status/volumesAttached",
"value": append(node.Status.VolumesAttached, corev1.AttachedVolume{
DevicePath: deviceName,
Name: volumeName,
}),
},
})
if err != nil {
return err
}
ns, err := clientset.CoreV1().Nodes().Patch(node.Name, types.JSONPatchType, patchData, "status")
if err != nil {
return err
}
log.Printf("Adding volume %s for node %s succeeded. VolumesAttached: %v\n", volumeName, node.Name, ns.Status.VolumesAttached)
return nil
}
func removeVolumeFromNode(clientset *kubernetes.Clientset, volumeName corev1.UniqueVolumeName, node *corev1.Node) error {
newAttachedVolumes := make([]corev1.AttachedVolume, 0)
for _, v := range node.Status.VolumesAttached {
if v.Name != volumeName {
newAttachedVolumes = append(newAttachedVolumes, v)
}
}
patchData, err := json.Marshal([]map[string]interface{}{
map[string]interface{}{
"op": "replace",
"path": "/status/volumesAttached",
"value": newAttachedVolumes,
},
})
if err != nil {
return err
}
ns, err := clientset.CoreV1().Nodes().Patch(node.Name, types.JSONPatchType, patchData, "status")
if err != nil {
return err
}
log.Printf("Removing volume %s from node %s succeeded. VolumesAttached: %v\n", volumeName, node.Name, ns.Status.VolumesAttached)
return nil
}
func mountPendingEBSVolumes(clientset *kubernetes.Clientset) {
nodes, err := clientset.CoreV1().Nodes().List(metav1.ListOptions{})
if err != nil {
panic(err.Error())
}
// First detach volumes we dont need
for _, node := range nodes.Items {
if node.Annotations["volumes.kubernetes.io/controller-managed-attach-detach"] != "true" {
continue
}
// TODO fix stuck when no pods were scheduled
for _, attachedVolume := range node.Status.VolumesAttached {
if strings.HasPrefix(string(attachedVolume.Name), "kubernetes.io/aws-ebs/") && !volumeInUse(attachedVolume.Name, &node) {
log.Printf("Need to detach volume %s from %s\n", attachedVolume.Name, node.Name)
err := detachEBSVolume(attachedVolume.Name, &node)
if err != nil {
log.Printf("Unable to detach EBS: %s", err.Error())
continue
}
err = removeVolumeFromNode(clientset, attachedVolume.Name, &node)
if err != nil {
log.Printf("Unable to sync EBS status: %s", err.Error())
continue
}
}
}
}
// Attach the ones we need
for _, node := range nodes.Items {
if node.Annotations["volumes.kubernetes.io/controller-managed-attach-detach"] != "true" {
continue
}
for _, requiredVolume := range node.Status.VolumesInUse {
if strings.HasPrefix(string(requiredVolume), "kubernetes.io/aws-ebs/") && !volumeAttached(requiredVolume, &node) {
log.Printf("Need to attach volume %s to %s\n", requiredVolume, node.Name)
device, err := attachEBSVolume(requiredVolume, &node)
if err != nil {
log.Printf("Unable to attach EBS: %s", err.Error())
continue
}
err = addVolumeToNode(clientset, requiredVolume, device, &node)
if err != nil {
log.Printf("Unable to sync EBS status: %s", err.Error())
continue
}
}
}
}
}