---
title: Ceph: who is mapping a RBD device
url: https://devopstales.github.io/kubernetes/who-mapping-rbd-device/
date: 2019-10-05
keywords: rook, ceph
---


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### Main problem
I get this error in Openshift:
```
  MountVolume.WaitForAttach failed for volume "pvc-9fcd3d08-d14e-11e9-a958-66934f1af826" :
  rbd image k8s-prod/kubernetes-dynamic-pvc-a0029613-d14e-11e9-aaf5-8611e6b1c395 is still being used
```

### Solution
So I Wanna know who is using this DBD device?

```
rbd status k8s-prod/kubernetes-dynamic-pvc-a0029613-d14e-11e9-aaf5-8611e6b1c395
Watchers:
	watcher=192.168.1.43:0/3614154426 client.165467009 cookie=18446462598732840961
```

To solve this problem you need to restart Openshift's Kubernetes components.

```
ssh 192.168.1.43
systemctl restart docker origin-node
```

Check if it is still mounted:

```
lsblk | grep "pvc-9fcd3d08-d14e-11e9-a958-66934f1af826"
rbd12                                252:192  0  100G  0 disk /var/lib/kubelet/plugins/kubernetes.io/csi/pv/pvc-9fcd3d08-d14e-11e9-a958-66934f1af826/globalmount/0001-0024-e285a458-7c95-4187-8129-fbd6c370c537-0000000000000006-12154609-2d98-11ec-9b66-66a9f6ca788c
```

With the restart of the docker and the kubelet the container dse not running anymore, so you can unmount it. Fot theat you need the rnd client.

```
rbd unmap k8s-prod/kubernetes-dynamic-pvc-a0029613-d14e-11e9-aaf5-8611e6b1c395
# or 
rbd unmap -o force k8s-prod/kubernetes-dynamic-pvc-a0029613-d14e-11e9-aaf5-8611e6b1c395
```