mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-09-19 23:19:52 +00:00
304 lines
9.7 KiB
Markdown
304 lines
9.7 KiB
Markdown
# Ceph CSI
|
|
|
|
## Overview
|
|
|
|
Ceph CSI plugins implement an interface between CSI enabled Container
|
|
Orchestrator and CEPH cluster. It allows dynamically provision CEPH
|
|
volumes and attach it to workloads.
|
|
Current implementation of Ceph CSI plugins was tested in Kubernetes environment (requires Kubernetes 1.10+),
|
|
but the code does not rely on any Kubernetes specific calls (WIP to make it k8s agnostic)
|
|
and should be able to run with any CSI enabled CO (Containers Orchestration).
|
|
|
|
[Container Storage Interface (CSI)](https://github.com/container-storage-interface/) driver, provisioner, and attacher for Ceph RBD and CephFS
|
|
|
|
## RBD Plugin
|
|
|
|
An RBD CSI plugin is available to help simplify storage management.
|
|
Once user creates PVC with the reference to a RBD storage class, rbd image and
|
|
corresponding PV object gets dynamically created and becomes ready to be used by
|
|
workloads.
|
|
|
|
### Configuration Requirements
|
|
|
|
* Secret object with the authentication key for ceph cluster
|
|
* StorageClass with rbdplugin (default CSI RBD plugin name) as a provisioner name
|
|
and information about ceph cluster (monitors, pool, etc)
|
|
* Service Accounts with required RBAC permissions
|
|
|
|
### Feature Status
|
|
|
|
### 1.9: Alpha
|
|
|
|
**Important:** `CSIPersistentVolume` and `MountPropagation`
|
|
[feature gates must be enabled starting in 1.9](#enabling-the-alpha-feature-gates).
|
|
Also API server must run with running config set to: `storage.k8s.io/v1alpha1`
|
|
|
|
### Compiling
|
|
CSI RBD plugin can be compiled in a form of a binary file or in a form of a container. When compiled
|
|
as a binary file, it gets stored in \_output folder with the name rbdplugin. When compiled as a container,
|
|
the resulting image is stored in a local docker's image store.
|
|
|
|
To compile just a binary file:
|
|
```
|
|
$ make rbdplugin
|
|
```
|
|
|
|
To build a container:
|
|
```
|
|
$ make container-rbdplugin
|
|
```
|
|
By running:
|
|
```
|
|
$ docker images | grep rbdplugin
|
|
```
|
|
You should see the following line in the output:
|
|
```
|
|
quay.io/cephcsi/rbdplugin v0.2.0 76369a8f8528 15 minutes ago 372.5 MB
|
|
```
|
|
|
|
### Testing
|
|
|
|
#### Prerequisite
|
|
|
|
##### Enable Mount Propagation in Docker
|
|
|
|
Comment out `MountFlags=slave` in docker systemd service then restart docker service.
|
|
```bash
|
|
# systemctl daemon-reload
|
|
# systemctl restart docker
|
|
```
|
|
|
|
##### Enable Kubernetes Feature Gates
|
|
|
|
Enable features `MountPropagation=true,CSIPersistentVolume=true` and runtime config `storage.k8s.io/v1alpha1=true`
|
|
|
|
#### Step 1: Create Secret
|
|
```
|
|
$ kubectl create -f ./deploy/rbd/kubernetes/rbd-secrets.yaml
|
|
```
|
|
**Important:** rbd-secrets.yaml, must be customized to match your ceph environment.
|
|
|
|
#### Step 2: Create StorageClass
|
|
```
|
|
$ kubectl create -f ./deploy/rbd/kubernetes/rbd-storage-class.yaml
|
|
```
|
|
**Important:** rbd-storage-class.yaml, must be customized to match your ceph environment.
|
|
|
|
#### Step 3: Start CSI CEPH RBD plugin
|
|
```
|
|
$ kubectl create -f ./deploy/rbd/kubernetes/rbdplugin.yaml
|
|
```
|
|
|
|
#### Step 4: Start CSI External Attacher
|
|
```
|
|
$ kubectl create -f ./deploy/rbd/kubernetes/csi-attacher.yaml
|
|
```
|
|
|
|
#### Step 5: Start CSI External Provisioner
|
|
```
|
|
$ kubectl create -f ./deploy/rbd/kubernetes/csi-provisioner.yaml
|
|
```
|
|
**Important:** Deployment yaml files includes required Service Account definitions and
|
|
required RBAC rules.
|
|
|
|
#### Step 6: Check status of CSI RBD plugin
|
|
```
|
|
$ kubectl get pods | grep csi
|
|
```
|
|
|
|
The following output should be displayed:
|
|
|
|
```
|
|
NAMESPACE NAME READY STATUS RESTARTS AGE
|
|
default csi-attacher-0 1/1 Running 0 1d
|
|
default csi-rbdplugin-qxqtl 2/2 Running 0 1d
|
|
default csi-provisioner-0 1/1 Running 0 1d
|
|
```
|
|
|
|
#### Step 7: Create PVC
|
|
```
|
|
$ kubectl create -f ./deploy/rbd/kubernetes/pvc.yaml
|
|
```
|
|
|
|
#### Step 8: Check status of provisioner PV
|
|
```
|
|
$ kubectl get pv
|
|
```
|
|
|
|
The following output should be displayed:
|
|
|
|
```
|
|
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
|
|
kubernetes-dynamic-pvc-1b19ddf1-0047-11e8-85ab-760f2eed12ea 5Gi RWO Delete Bound default/csi-pvc rbdv2 10s
|
|
```
|
|
|
|
```
|
|
$ kubectl describe pv kubernetes-dynamic-pvc-1b19ddf1-0047-11e8-85ab-760f2eed12ea
|
|
Name: kubernetes-dynamic-pvc-1b19ddf1-0047-11e8-85ab-760f2eed12ea
|
|
Annotations: csi.volume.kubernetes.io/volume-attributes={"monitors":"192.168.80.233:6789","pool":"kubernetes"}
|
|
csiProvisionerIdentity=1516716490787-8081-rbdplugin <------ !!!
|
|
pv.kubernetes.io/provisioned-by=rbdplugin
|
|
StorageClass: rbdv2 <------ !!!
|
|
Status: Bound <------ !!!
|
|
Claim: default/csi-pvc <------ !!!
|
|
Reclaim Policy: Delete
|
|
Access Modes: RWO
|
|
VolumeMode: Filesystem
|
|
Capacity: 5Gi
|
|
Message:
|
|
Source:
|
|
Type: CSI <------ !!!
|
|
```
|
|
|
|
#### Step 9: Create a test pod
|
|
|
|
```bash
|
|
# kubectl create -f ./deploy/rbd/pod.yaml
|
|
```
|
|
|
|
## CephFS plugin
|
|
|
|
A CephFS CSI plugin is available to help simplify storage management.
|
|
Once user creates PVC with the reference to a CephFS CSI storage class, corresponding
|
|
PV object gets dynamically created and becomes ready to be used by workloads.
|
|
|
|
### Configuration Requirements
|
|
|
|
* Secret object with the authentication key for ceph cluster
|
|
* StorageClass with csi-cephfsplugin (default CSI CephFS plugin name) as a provisioner name
|
|
and information about ceph cluster (mounter, monitors, user name, secret)
|
|
* CephFS root path, which is then mounted by either `ceph-fuse` or `mount.ceph` - configurable
|
|
through the StorageClass
|
|
* Service Accounts with required RBAC permissions
|
|
|
|
### Feature Status
|
|
|
|
### 1.10: Alpha
|
|
|
|
**Important:** `CSIPersistentVolume` and `MountPropagation`
|
|
[feature gates must be enabled starting in 1.9](#enabling-the-alpha-feature-gates).
|
|
Also API server must run with running config set to: `storage.k8s.io/v1alpha1`
|
|
|
|
* `kube-apiserver` must be launched with `--feature-gates=CSIPersistentVolume=true,MountPropagation=true`
|
|
and `--runtime-config=storage.k8s.io/v1alpha1=true`
|
|
* `kube-controller-manager` must be launched with `--feature-gates=CSIPersistentVolume=true`
|
|
* `kubelet` must be launched with `--feature-gates=CSIPersistentVolume=true,MountPropagation=true`
|
|
|
|
### Compiling
|
|
CSI CephFS plugin can be compiled in a form of a binary file or in a form of a container. When compiled
|
|
as a binary file, it gets stored in \_output folder with the name cephfsplugin. When compiled as a container,
|
|
the resulting image is stored in a local docker's image store.
|
|
|
|
To compile just a binary file:
|
|
```
|
|
$ make cephfsplugin
|
|
```
|
|
|
|
To build a container:
|
|
```
|
|
$ make cephfsplugin-container
|
|
```
|
|
By running:
|
|
```
|
|
$ docker images | grep cephfsplugin
|
|
```
|
|
You should see the following line in the output:
|
|
```
|
|
quay.io/cephcsi/cephfsplugin v0.2.0 79482e644593 4 minutes ago 305MB
|
|
```
|
|
|
|
### Testing
|
|
|
|
#### Prerequisite
|
|
|
|
##### Enable Mount Propagation in Docker
|
|
|
|
Comment out `MountFlags=slave` in docker systemd service then restart docker service.
|
|
```
|
|
# systemctl daemon-reload
|
|
# systemctl restart docker
|
|
```
|
|
|
|
##### Enable Kubernetes Feature Gates
|
|
|
|
Enable features `MountPropagation=true,CSIPersistentVolume=true` and runtime config `storage.k8s.io/v1alpha1=true`
|
|
|
|
#### Step 1: Create Secret
|
|
```
|
|
$ kubectl create -f ./deploy/cephfs/kubernetes/secret.yaml
|
|
```
|
|
**Important:** secret.yaml, must be customized to match your ceph environment.
|
|
|
|
#### Step 2: Create StorageClass
|
|
```
|
|
$ kubectl create -f ./deploy/cephfs/kubernetes/cephfs-storage-class.yaml
|
|
```
|
|
**Important:** cephfs-storage-class.yaml, must be customized to match your ceph environment.
|
|
|
|
#### Step 3: Start CSI CEPH CephFS plugin
|
|
```
|
|
$ kubectl create -f ./deploy/cephfs/kubernetes/cephfsplugin.yaml
|
|
```
|
|
|
|
#### Step 4: Start CSI External Attacher
|
|
```
|
|
$ kubectl create -f ./deploy/cephfs/kubernetes/csi-attacher.yaml
|
|
```
|
|
|
|
#### Step 5: Start CSI External Provisioner
|
|
```
|
|
$ kubectl create -f ./deploy/cephfs/kubernetes/csi-provisioner.yaml
|
|
```
|
|
**Important:** Deployment yaml files includes required Service Account definitions and
|
|
required RBAC rules.
|
|
|
|
#### Step 6: Check status of CSI CephFS plugin
|
|
```
|
|
$ kubectl get pods | grep csi
|
|
csi-attacher-0 1/1 Running 0 6m
|
|
csi-cephfsplugin-hmqpk 2/2 Running 0 6m
|
|
csi-provisioner-0 1/1 Running 0 6m
|
|
```
|
|
|
|
#### Step 7: Create PVC
|
|
```
|
|
$ kubectl create -f ./deploy/cephfs/kubernetes/pvc.yaml
|
|
```
|
|
|
|
#### Step 8: Check status of provisioner PV
|
|
```
|
|
$ kubectl get pv
|
|
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
|
|
kubernetes-dynamic-pv-715cef0b30d811e8 5Gi RWX Delete Bound default/csi-cephfs-pvc csi-cephfs 5s
|
|
```
|
|
|
|
```
|
|
$ kubectl describe pv kubernetes-dynamic-pv-715cef0b30d811e8
|
|
Name: kubernetes-dynamic-pv-715cef0b30d811e8
|
|
Labels: <none>
|
|
Annotations: pv.kubernetes.io/provisioned-by=csi-cephfsplugin
|
|
StorageClass: csi-cephfs
|
|
Status: Bound
|
|
Claim: default/csi-cephfs-pvc
|
|
Reclaim Policy: Delete
|
|
Access Modes: RWX
|
|
Capacity: 5Gi
|
|
Message:
|
|
Source:
|
|
Type: CSI (a Container Storage Interface (CSI) volume source)
|
|
Driver: ReadOnly: %v
|
|
|
|
VolumeHandle: csi-cephfsplugin
|
|
%!(EXTRA string=csi-cephfs-7182b779-30d8-11e8-bf01-5254007d7491, bool=false)Events: <none>
|
|
```
|
|
|
|
#### Step 9: Create a test pod
|
|
|
|
```
|
|
$ kubectl create -f ./deploy/cephfs/kubernetes/pod.yaml
|
|
```
|
|
|
|
## Troubleshooting
|
|
|
|
Please submit an issue at:[Issues](https://github.com/ceph/ceph-csi/issues)
|