This is needed for raw block volumes. It mirrors a change made in the upstream
deployment in https://github.com/kubernetes-csi/csi-driver-host-path/pull/109
Raw block volumes use loop devices under the hood. "losetup --find
--show" uses LOOP_CTL_GET_FREE to get a free loop device. It then
expects to have the corresponding /dev/loopX already available. When
/dev inside the container is a static tmpfs which doesn't already have
those /dev/loop* devices (*) the new device fails to show up,
resulting in:
I1028 13:25:19.937846 1 server.go:117] GRPC call: /csi.v1.Controller/CreateVolume
I1028 13:25:19.938083 1 server.go:118] GRPC request: {"accessibility_requirements":{"preferred":[{"segments":{"topology.hostpath.csi/node":"pmem-csi-pmem-govm-worker3"}}],"requisite":[{"segments":{"topology.hostpath.csi/node":"pmem-csi-pmem-govm-worker3"}}]},"capacity_range":{"required_bytes":5368709120},"name":"pvc-24985a49-5638-4bf6-b789-bb99a28d1073","volume_capabilities":[{"AccessType":{"Block":{}},"access_mode":{"mode":1}}]}
I1028 13:25:19.961124 1 volume_path_handler_linux.go:41] Creating device for path: /csi-data-dir/635c6569-f986-11e9-baa6-0242ac110004
I1028 13:25:20.391472 1 volume_path_handler_linux.go:75] Failed device create command for path: /csi-data-dir/635c6569-f986-11e9-baa6-0242ac110004 exit status 1 losetup: /csi-data-dir/635c6569-f986-11e9-baa6-0242ac110004: failed to set up loop device: No such file or directory
E1028 13:25:20.392916 1 server.go:121] GRPC error: rpc error: code = Internal desc = failed to create volume 635c6569-f986-11e9-baa6-0242ac110004: failed to attach device /csi-data-dir/635c6569-f986-11e9-baa6-0242ac110004: exit status 1
(*) It seems that the static tmpfs gets populated by Docker based on
what's currently on the host when the container starts. That would
explain why it worked in the Kubernetes Prow testing - the host must
have had enough loop devices already defined.
This updates to the releases meant to be used with Kubernetes 1.16
except for external-snapshotter, which is kept at the more recent
2.0.0-rc1 which targets 1.17.
The new external-attacher v2.0.0 needs updated RBAC rules, copied
verbatim from the v2.0.0 release.
This PR does minimal changes to interface to allow removing all
references to prometheus from `test` directory. In future I would expect
wrapping prometheus samples to provide better abstraction. Changes:
Move generic_metrics.go to testutil/metrics.go
Remove etcd.go as it was not called
Move prometheus label consts to testutil.
