31648c8feb
The container runtime CRI-O limits the number of PIDs to 1024 by
default. When many PVCs are requested at the same time, it is possible
for the provisioner to start too many threads (or go routines) and
executing 'rbd' commands can start to fail. In case a go routine can not
get started, the process panics.
The PID limit can be changed by passing an argument to kubelet, but this
will affect all pids running on a host. Changing the parameters to
kubelet is also not a very elegant solution.
Instead, the provisioner pod can change the configuration itself. The
pod is running in privileged mode and can write to /sys/fs/cgroup where
the limit is configured.
With this change, the limit is configured to 'max', just as if there is
no limit at all. The logs of the csi-rbdplugin in the provisioner pod
will reflect the change it makes when starting the service:
$ oc -n rook-ceph logs -c csi-rbdplugin csi-rbdplugin-provisioner-0
..
I0726 13:59:19.737678 1 cephcsi.go:127] Initial PID limit is set to 1024
I0726 13:59:19.737746 1 cephcsi.go:136] Reconfigured PID limit to -1 (max)
..
It is possible to pass a different limit on the commandline of the
cephcsi executable. The following flag has been added:
--pidlimit=<int> the PID limit to configure through cgroups
This accepts special values -1 (max) and 0 (default, do not
reconfigure). Other integers will be the limit that gets configured in
cgroups.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Ceph CSI
This repo contains Ceph Container Storage Interface (CSI) driver for RBD, CephFS and kubernetes sidecar deployment yamls of provisioner, attacher, node-driver-registrar and snapshotter for supporting CSI functionalities.
Overview
Ceph CSI plugins implement an interface between CSI enabled Container Orchestrator (CO) and Ceph cluster. It allows dynamically provisioning Ceph volumes and attaching them to workloads.
Independent CSI plugins are provided to support RBD and CephFS backed volumes,
- For details about configuration and deployment of RBD plugin, please refer rbd doc and for CephFS plugin configuration and deployment please refer cephfs doc.
- For example usage of RBD and CephFS CSI plugins, see examples in
examples/.
Project status
Status: GA
Supported CO platforms
Ceph CSI drivers are currently developed and tested exclusively on Kubernetes environments. There is work in progress to make this CO independent and thus support other orchestration environments in the future.
NOTE:
csiv0.3is deprecated with release ofcsi v1.1.0
Support Matrix
Ceph-CSI features and available versions
| Plugin | Features | Feature Status | CSI Driver Version | CSI Spec Version | Ceph Cluster Version | Kubernetes Version |
|---|---|---|---|---|---|---|
| RBD | Dynamically provision, de-provision Block mode RWO volume | GA | >=v1.0.0 | >=v1.0.0 | >= Mimic | >= v1.13.0 |
| Dynamically provision, de-provision Block mode RWX volume | GA | >=v1.0.0 | >=v1.0.0 | >= Mimic | >= v1.13.0 | |
| Dynamically provision, de-provision File mode RWO volume | GA | >=v1.0.0 | >=v1.0.0 | >= Mimic | >= v1.13.0 | |
| Creating and deleting snapshot | Alpha | >=v1.0.0 | >=v1.0.0 | >= Mimic | >= v1.13.0 | |
| Provision volume from snapshot | Alpha | >=v1.0.0 | >=v1.0.0 | >= Mimic | >= v1.13.0 | |
| Provision volume from another volume | - | - | - | - | - | |
| Resize volume | - | - | - | - | - | |
| Metrics Support | - | - | - | - | - | |
| CephFS | Dynamically provision, de-provision File mode RWO volume | Alpha | >=v1.1.0 | >=v1.0.0 | Nautilus (>=14.2.2) | >=v1.13.0 |
| Dynamically provision, de-provision File mode RWX volume | Alpha | >=v1.1.0 | >=v1.0.0 | Nautilus (>=v14.2.2) | >=v1.13.0 | |
| Creating and deleting snapshot | - | - | - | - | - | |
| Provision volume from snapshot | - | - | - | - | - | |
| Provision volume from another volume | - | - | - | - | - | |
| Resize volume | - | - | - | - | - | |
| Metrics | - | - | - | - | - |
NOTE: The Alpha status reflects possible non-backward
compatible changes in the future, and is thus not recommended
for production use.
CSI spec and Kubernetes version compatibility
Please refer to the matrix in the Kubernetes documentation.
Contributing to this repo
Please follow development-guide and coding style guidelines if you are interested to contribute to this repo.
Troubleshooting
Please submit an issue at: Issues
Weekly Bug Triage call
We conduct weekly bug triage calls at our slack channel on Tuesdays. More details are available here
Contact
Please use the following to reach members of the community:
- Slack: Join our slack channel to discuss about anything related to this project. You can join the slack by this invite link
- Forums: ceph-csi
- Twitter: @CephCsi