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191 lines
14 KiB
Markdown
191 lines
14 KiB
Markdown
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# CSI CephFS plugin
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The CSI CephFS plugin is able to both provision new CephFS volumes
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and attach and mount existing ones to workloads.
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## Building
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CSI plugin can be compiled in the form of a binary file or in the form
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of a Docker image.
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When compiled as a binary file, the result is stored in `_output/`
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directory with the name `cephcsi`.
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When compiled as an image, it's stored in the local Docker image store
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with name `cephcsi`.
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Building binary:
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```bash
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make cephcsi
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```
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Building Docker image:
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```bash
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make image-cephcsi
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```
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## Configuration
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**NOTE:** To make CephFS CSI driver version >= 1.1.0 work with Ceph v14.2.2
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cluster (not deployed by rook), you need to add the following settings in the
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`mgr` section of the ceph.conf used by the Ceph manager daemon, and restart the
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Ceph manager daemon.
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```
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[mgr]
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client mount uid = 0
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client mount gid = 0
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```
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This is due to an [issue](http://tracker.ceph.com/issues/40927) in Ceph v14.2.2
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that should be resolved in v14.2.3.
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**Available command line arguments:**
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| Option | Default value | Description |
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| --------------------- | --------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
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| `--endpoint` | `unix://tmp/csi.sock` | CSI endpoint, must be a UNIX socket |
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| `--drivername` | `cephfs.csi.ceph.com` | Name of the driver (Kubernetes: `provisioner` field in StorageClass must correspond to this value) |
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| `--nodeid` | _empty_ | This node's ID |
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| `--type` | _empty_ | Driver type `[rbd | cephfs]` If the driver type is set to `rbd` it will act as a `rbd plugin` or if it's set to `cephfs` will act as a `cephfs plugin` |
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| `--mountcachedir` | _empty_ | Volume mount cache info save dir. If left unspecified, the dirver will not record mount info, or it will save mount info and when driver restart it will remount volume it cached. |
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| `--instanceid` | "default" | Unique ID distinguishing this instance of Ceph CSI among other instances, when sharing Ceph clusters across CSI instances for provisioning |
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| `--pluginpath` | "/var/lib/kubelet/plugins/" | The location of cephcsi plugin on host |
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| `--metadatastorage` | _empty_ | Points to where older (1.0.0 or older plugin versions) metadata about provisioned volumes are kept, as file or in as k8s configmap (`node` or `k8s_configmap` respectively) |
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| `--pidlimit` | _0_ | Configure the PID limit in cgroups. The container runtime can restrict the number of processes/tasks which can cause problems while provisioning (or deleting) a large number of volumes. A value of `-1` configures the limit to the maximum, `0` does not configure limits at all. |
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| `--metricsport` | `8080` | TCP port for /grpc metrics requests |
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| `--metricspath` | `/metrics` | Path of prometheus endpoint where metrics will be available |
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| `--enablegrpcmetrics` | `false` | Enable grpc metrics collection and start prometheus server |
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| `--polltime` | `60s` | Time interval in between each poll |
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| `--timeout` | `3s` | Probe timeout in seconds |
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| `--histogramoption` | `0.5,2,6` | Histogram option for grpc metrics, should be comma separated value (ex:= "0.5,2,6" where start=0.5 factor=2, count=6) |
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**Available environmental variables:**
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`KUBERNETES_CONFIG_PATH`: if you use `k8s_configmap` as metadata store, specify
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the path of your k8s config file (if not specified, the plugin will assume
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you're running it inside a k8s cluster and find the config itself).
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`POD_NAMESPACE`: if you use `k8s_configmap` as metadata store, `POD_NAMESPACE`
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is used to define in which namespace you want the configmaps to be stored
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**Available volume parameters:**
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| Parameter | Required | Description |
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| --------------------------------------------------------------------------------------------------- | -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| `clusterID` | yes | String representing a Ceph cluster, must be unique across all Ceph clusters in use for provisioning, cannot be greater than 36 bytes in length, and should remain immutable for the lifetime of the Ceph cluster in use |
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| `fsName` | yes | CephFS filesystem name into which the volume shall be created |
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| `mounter` | no | Mount method to be used for this volume. Available options are `kernel` for Ceph kernel client and `fuse` for Ceph FUSE driver. Defaults to "default mounter". |
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| `pool` | no | Ceph pool into which volume data shall be stored |
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| `csi.storage.k8s.io/provisioner-secret-name`, `csi.storage.k8s.io/node-stage-secret-name` | for Kubernetes | Name of the Kubernetes Secret object containing Ceph client credentials. Both parameters should have the same value |
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| `csi.storage.k8s.io/provisioner-secret-namespace`, `csi.storage.k8s.io/node-stage-secret-namespace` | for Kubernetes | Namespaces of the above Secret objects |
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**NOTE:** An accompanying CSI configuration file, needs to be provided to the
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running pods. Refer to [Creating CSI configuration](../examples/README.md#creating-csi-configuration)
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for more information.
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**NOTE:** A suggested way to populate and retain uniqueness of the clusterID is
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to use the output of `ceph fsid` of the Ceph cluster to be used for
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provisioning.
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**Required secrets for provisioning:**
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Admin credentials are required for provisioning new volumes
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* `adminID`: ID of an admin client
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* `adminKey`: key of the admin client
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**Required secrets for statically provisioned volumes:**
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User credentials with access to an existing volume
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* `userID`: ID of a user client
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* `userKey`: key of a user client
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Notes on volume size: when provisioning a new volume, `max_bytes` quota
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attribute for this volume will be set to the requested volume size (see [Ceph
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quota documentation](http://docs.ceph.com/docs/mimic/cephfs/quota/)). A request
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for a zero-sized volume means no quota attribute will be set.
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## Deployment with Kubernetes
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Requires Kubernetes 1.13+
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if your cluster version is 1.13.x please use [cephfs v1.13
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templates](../deploy/cephfs/kubernetes/v1.13) or else use [cephfs v1.14+
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templates](../deploy/cephfs/kubernetes/v1.14+)
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Your Kubernetes cluster must allow privileged pods (i.e. `--allow-privileged`
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flag must be set to true for both the API server and the kubelet). Moreover, as
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stated in the [mount propagation
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docs](https://kubernetes.io/docs/concepts/storage/volumes/#mount-propagation),
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the Docker daemon of the cluster nodes must allow shared mounts.
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YAML manifests are located in `deploy/cephfs/kubernetes`.
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**Deploy RBACs for sidecar containers and node plugins:**
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```bash
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kubectl create -f csi-provisioner-rbac.yaml
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kubectl create -f csi-nodeplugin-rbac.yaml
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```
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Those manifests deploy service accounts, cluster roles and cluster role
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bindings. These are shared for both RBD and CephFS CSI plugins, as they require
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the same permissions.
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**Deploy ConfigMap for CSI plugins:**
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```bash
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kubectl create -f csi-config-map.yaml
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```
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The configmap deploys an empty CSI configuration that is mounted as a volume
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within the Ceph CSI plugin pods. To add a specific Ceph clusters configuration
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details, refer to [Creating CSI configuration](../examples/README.md#creating-csi-configuration)
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for more information.
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**Deploy CSI sidecar containers:**
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```bash
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kubectl create -f csi-cephfsplugin-provisioner.yaml
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```
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Deploys stateful set of provision which includes external-provisioner
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,external-attacher for CSI CephFS.
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**Deploy CSI CephFS driver:**
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```bash
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kubectl create -f csi-cephfsplugin.yaml
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```
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Deploys a daemon set with two containers: CSI node-driver-registrar and
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the CSI CephFS driver.
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## Verifying the deployment in Kubernetes
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After successfully completing the steps above, you should see output similar to this:
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```bash
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$ kubectl get all
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NAME READY STATUS RESTARTS AGE
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pod/csi-cephfsplugin-provisioner-0 4/4 Running 0 25s
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pod/csi-cephfsplugin-rljcv 3/3 Running 0 24s
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NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
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service/csi-cephfsplugin-provisioner ClusterIP 10.101.78.75 <none> 8080/TCP 26s
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...
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```
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Once the CSI plugin configuration is updated with details from a Ceph cluster of
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choice, you can try deploying a demo pod from examples/cephfs using the
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instructions [provided](../examples/README.md#deploying-the-storage-class) to
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test the deployment further.
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### Notes on volume deletion
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Dynamically povisioned volumes are deleted by the driver, when requested to
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do so. Statically provisioned volumes, from plugin versions less than or
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equal to 1.0.0, are a no-op when a delete operation is performed against the
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same, and are expected to be deleted on the Ceph cluster by the user.
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