I install kubernetes with 1 master and 3 worker and deploy rook on it and the ceph status in rook-tools shows ok. there is wordpress template in https://github.com/rook/rook.git and when i create it the pod does not created and
#kubectl describe pods wordpress-mysql-b78774f44-m548z -n default
Type Reason Age From Message
---- ------ ---- ---- -------
Warning FailedMount 15m (x51 over 128m) kubelet, ubuntu2 Unable to mount volumes for pod "test-pod-rbd_rook-ceph(15abe007-53a4-11e9-abd9-7c8bca00f216)": timeout expired waiting for volumes to attach or mount for pod "rook-ceph"/"test-pod-rbd". list of unmounted volumes=[data]. list of unattached volumes=[data default-token-8p9br]
Warning FailedMount 18s (x72 over 130m) kubelet, ubuntu2 MountVolume.SetUp failed for volume "pvc-fd3fdbc4-53b7-11e9-abd9-7c8bca00f216" : mount command failed, status: Failure, reason: failed to mount volume /dev/rbd1 [xfs] to /var/lib/kubelet/plugins/ceph.rook.io/rook-ceph-system/mounts/pvc-fd3fdbc4-53b7-11e9-abd9-7c8bca00f216, error executable file not found in $PATH
#kubectl get events
18h Warning FailedMount pod/wordpress-mysql-b78774f44-m548z MountVolume.SetUp failed for volume "pvc-e1e758a8-53b6-11e9-abd9-7c8bca00f216" : mount command failed, status: Failure, reason: failed to mount volume /dev/rbd0 [xfs] to /var/lib/kubelet/plugins/ceph.rook.io/rook-ceph-system/mounts/pvc-e1e758a8-53b6-11e9-abd9-7c8bca00f216, error executable file not found in $PATH
18h Warning FailedMount pod/wordpress-mysql-b78774f44-m548z Unable to mount volumes for pod "wordpress-mysql-b78774f44-m548z_default(e1f6de90-53b6-11e9-abd9-7c8bca00f216)": timeout expired waiting for volumes to attach or mount for pod "default"/"wordpress-mysql-b78774f44-m548z". list of unmounted volumes=[mysql-persistent-storage]. list of unattached volumes=[mysql-persistent-storage default-token-bktfl]
35m Warning FailedMount pod/wordpress-mysql-b78774f44-m548z MountVolume.SetUp failed for volume "pvc-e1e758a8-53b6-11e9-abd9-7c8bca00f216" : mount command failed, status: Failure, reason: Rook: Error getting RPC client: error connecting to socket /usr/libexec/kubernetes/kubelet-plugins/volume/exec/ceph.rook.io~rook-ceph-system/.rook.sock: dial unix /usr/libexec/kubernetes/kubelet-plugins/volume/exec/ceph.rook.io~rook-ceph-system/.rook.sock: connect: connection refused
6m32s Warning FailedMount pod/wordpress-mysql-b78774f44-m548z Unable to mount volumes for pod "wordpress-mysql-b78774f44-m548z_default(e1f6de90-53b6-11e9-abd9-7c8bca00f216)": timeout expired waiting for volumes to attach or mount for pod "default"/"wordpress-mysql-b78774f44-m548z". list of unmounted volumes=[mysql-persistent-storage]. list of unattached volumes=[mysql-persistent-storage default-token-bktfl]
4m17s Warning FailedMount pod/wordpress-mysql-b78774f44-m548z MountVolume.SetUp failed for volume "pvc-e1e758a8-53b6-11e9-abd9-7c8bca00f216" : mount command failed, status: Failure, reason: Rook: Mount volume failed: failed to attach volume replicapool/pvc-e1e758a8-53b6-11e9-abd9-7c8bca00f216: failed to map image replicapool/pvc-e1e758a8-53b6-11e9-abd9-7c8bca00f216 cluster rook-ceph. failed to map image replicapool/pvc-e1e758a8-53b6-11e9-abd9-7c8bca00f216: Failed to complete 'rbd': signal: interrupt. . output:How can i solve it? Is it a bug?
to resolve this issue, you must change fstype: xfs -> ext4 in your StorageClass
This looks like there is a problem with pv,pvc. Please run more basics checks, like:
kubectl get pods,pv,pvc --all-namespaces
kubectl describe pvc-fd3fdbc4-53b7-11e9-abd9-7c8bca00f216
kubectl get pvc pvc-fd3fdbc4-53b7-11e9-abd9-7c8bca00f216 -o yaml
kubectl get pod wordpress-mysql-b78774f44-m548z -o yaml
kubectl -n rook-ceph get all
kubectl get storageclasses --all-namespacesYou can find more helpful information about troubleshooting techniques and commands when you are working with Rook
Hope this help and please share what you were able to find so we can troubleshoot this.