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Automatic merge from submit-queue Implement CanMount() for gfsMounter for linux **What this PR does / why we need it**: To implement CanMount() check for glusterfs. If mount binaries are not present on the underlying node, the mount will not proceed and return an error message stating so. Related to issue : https://github.com/kubernetes/kubernetes/issues/36098 Related to similar change for NFS : https://github.com/kubernetes/kubernetes/pull/36280 **Release note**: `Check binaries for GlusterFS on the underlying node before doing mount` Sample output from testing in GCE/GCI: rkouj@rkouj0:~/go/src/k8s.io/kubernetes$ kubectl describe pods Name: glusterfs Namespace: default Node: e2e-test-rkouj-minion-group-kjq3/10.240.0.3 Start Time: Fri, 11 Nov 2016 17:22:04 -0800 Labels: <none> Status: Pending IP: Controllers: <none> Containers: glusterfs: Container ID: Image: gcr.io/google_containers/busybox Image ID: Port: QoS Tier: cpu: Burstable memory: BestEffort Requests: cpu: 100m State: Waiting Reason: ContainerCreating Ready: False Restart Count: 0 Environment Variables: Conditions: Type Status Initialized True Ready False PodScheduled True Volumes: glusterfs: Type: Glusterfs (a Glusterfs mount on the host that shares a pod's lifetime) EndpointsName: glusterfs-cluster Path: kube_vol ReadOnly: true default-token-2zcao: Type: Secret (a volume populated by a Secret) SecretName: default-token-2zcao Events: FirstSeen LastSeen Count From SubobjectPath Type Reason Message --------- -------- ----- ---- ------------- -------- ------ ------- 8s 8s 1 {default-scheduler } Normal Scheduled Successfully assigned glusterfs to e2e-test-rkouj-minion-group-kjq3 7s 4s 4 {kubelet e2e-test-rkouj-minion-group-kjq3} Warning FailedMount Unable to mount volume kubernetes.io/glusterfs/6bb04587-a876-11e6-a712-42010af00002-glusterfs (spec.Name: glusterfs) on pod glusterfs (UID: 6bb04587-a876-11e6-a712-42010af00002). Verify that your node machine has the required components before attempting to mount this volume type. Required binary /sbin/mount.glusterfs is missing