327a12cd08
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. |
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Kubernetes
Kubernetes is an open source system for managing containerized applications across multiple hosts. It provides basic mechanisms for deployment, maintenance, and scaling of applications.
Kubernetes builds upon a decade and a half of experience at Google running production workloads at scale using a system called Borg, combined with best-of-breed ideas and practices from the community.
Kubernetes is hosted by the Cloud Native Computing Foundation (CNCF). If your company wants to help shape the evolution of technologies that are container-packaged, dynamically scheduled, and microservices-oriented, consider joining the CNCF. For details about who's involved and how Kubernetes plays a role, read the CNCF announcement.
To start using Kubernetes
See our documentation on kubernetes.io.
Try our interactive tutorial.
Take a free course on Scalable Microservices with Kubernetes.
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The community repository hosts all information about building Kubernetes from source, how to contribute code and documentation, who to contact about what, etc.
If you want to build Kubernetes right away there are two options:
You have a working Go environment.
mkdir -p $GOPATH/src/k8s.io
cd $GOPATH/src/k8s.io
git clone https://github.com/kubernetes/kubernetes
cd kubernetes
make
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git clone https://github.com/kubernetes/kubernetes
cd kubernetes
make quick-release
For the full story, head over to the developer's documentation.
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If you need support, start with the troubleshooting guide, and work your way through the process that we've outlined.
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