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dd96024620
avoid specifying the image feature dependencies and add a link to rbd official document for reference to the image feature dependencies. Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
392 lines
30 KiB
Markdown
392 lines
30 KiB
Markdown
# CSI RBD Plugin
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The RBD CSI plugin is able to provision new RBD images and
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attach and mount those to workloads.
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## Building
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CSI plugin can be compiled in a form of a binary file or in a form of a
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Docker image. When compiled as a binary file, the result is stored in
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`_output/` directory with the name `cephcsi`. When compiled as an image, it's
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stored in the local Docker image store 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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**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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| `--csi-addons-endpoint` | `unix:///tmp/csi-addons.sock` | CSI-Addons endpoint, must be a UNIX socket |
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| `--drivername` | `rbd.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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| `--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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| `--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 liveness metrics requests |
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| `--metricspath` | `"/metrics"` | Path of prometheus endpoint where metrics will be available |
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| `--enablegrpcmetrics` | `false` | [Deprecated] 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` | [Deprecated] 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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| `--domainlabels` | _empty_ | Kubernetes node labels to use as CSI domain labels for topology aware provisioning, should be a comma separated value (ex:= "failure-domain/region,failure-domain/zone") |
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| `--rbdhardmaxclonedepth` | `8` | Hard limit for maximum number of nested volume clones that are taken before a flatten occurs |
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| `--rbdsoftmaxclonedepth` | `4` | Soft limit for maximum number of nested volume clones that are taken before a flatten occurs |
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| `--skipforceflatten` | `false` | skip image flattening on kernel < 5.2 which support mapping of rbd images which has the deep-flatten feature |
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| `--maxsnapshotsonimage` | `450` | Maximum number of snapshots allowed on rbd image without flattening |
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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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| `pool` | yes | Ceph pool into which the RBD image shall be created |
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| `dataPool` | no | Ceph pool used for the data of the RBD images. |
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| `volumeNamePrefix` | no | Prefix to use for naming RBD images (defaults to `csi-vol-`). |
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| `snapshotNamePrefix` | no | Prefix to use for naming RBD snapshot images (defaults to `csi-snap-`). |
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| `imageFeatures` | no | RBD image features. CSI RBD currently supports `layering`, `journaling`, `exclusive-lock`, `object-map`, `fast-diff`, `deep-flatten` features. deep-flatten is added for cloned images. Refer <https://docs.ceph.com/en/latest/rbd/rbd-config-ref/#image-features> for image feature dependencies. |
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| `tryOtherMounters` | no | Specifies whether to try other mounters in case if the current mounter fails to mount the rbd image for any reason |
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| `mapOptions` | no | Map options to use when mapping rbd image. See [krbd](https://docs.ceph.com/docs/master/man/8/rbd/#kernel-rbd-krbd-options) and [nbd](https://docs.ceph.com/docs/master/man/8/rbd-nbd/#options) options. |
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| `unmapOptions` | no | Unmap options to use when unmapping rbd image. See [krbd](https://docs.ceph.com/docs/master/man/8/rbd/#kernel-rbd-krbd-options) and [nbd](https://docs.ceph.com/docs/master/man/8/rbd-nbd/#options) options. |
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| `csi.storage.k8s.io/provisioner-secret-name`, `csi.storage.k8s.io/node-stage-secret-name` | yes (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` | yes (for Kubernetes) | namespaces of the above Secret objects |
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| `mounter` | no | if set to `rbd-nbd`, use `rbd-nbd` on nodes that have `rbd-nbd` and `nbd` kernel modules to map rbd images |
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| `encrypted` | no | disabled by default, use `"true"` to enable LUKS encryption on PVC and `"false"` to disable it. **Do not change for existing storageclasses** |
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| `encryptionKMSID` | no | required if encryption is enabled and a kms is used to store passphrases |
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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:**
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User credentials, with required access to the pool being used in the storage class,
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is required for provisioning new RBD images.
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## Deployment with Kubernetes
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Requires Kubernetes 1.14+
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Use the [rbd templates](../deploy/rbd/kubernetes)
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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/rbd/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 PodSecurityPolicy resources for sidecar containers and node plugins:**
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**NOTE:** These manifests are required only if [PodSecurityPolicy](https://kubernetes.io/docs/reference/access-authn-authz/admission-controllers/#podsecuritypolicy)
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admission controller is active on your cluster.
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```bash
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kubectl create -f csi-provisioner-psp.yaml
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kubectl create -f csi-nodeplugin-psp.yaml
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```
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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 for RBD based
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provisioning](../examples/README.md#creating-csi-configuration-for-rbd-based-provisioning)
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for more information.
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**Deploy Ceph configuration ConfigMap for CSI pods:**
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```bash
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kubectl create -f ../example/ceph-config.yaml
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```
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**Deploy CSI sidecar containers:**
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```bash
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kubectl create -f csi-rbdplugin-provisioner.yaml
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```
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Deploys deployment of provision which includes external-provisioner
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,external-attacher,csi-snapshotter sidecar containers and CSI RBD plugin.
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**Deploy RBD CSI driver:**
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```bash
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kubectl create -f csi-rbdplugin.yaml
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```
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Deploys a daemon set with two containers: CSI node-driver-registrar and the CSI
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RBD driver.
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**NOTE:**
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In case you want to use a different release version, replace canary with the
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release version in the
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[provisioner](../deploy/rbd/kubernetes/csi-rbdplugin-provisioner.yaml)
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and [nodeplugin](../deploy/rbd/kubernetes/csi-rbdplugin.yaml) YAMLs.
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```yaml
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# for stable functionality replace canary with latest release version
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image: quay.io/cephcsi/cephcsi:canary
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```
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Check the release version [here.](../README.md#ceph-csi-container-images-and-release-compatibility)
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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-rbdplugin-fptqr 3/3 Running 0 21s
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pod/csi-rbdplugin-provisioner-0 5/5 Running 0 22s
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NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
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service/csi-rbdplugin-provisioner ClusterIP 10.104.2.130 <none> 8080/TCP 23s
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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/rbd 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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## Deployment with Helm
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The same requirements from the Kubernetes section apply here, i.e. Kubernetes
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version, privileged flag and shared mounts.
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The Helm chart is located in `charts/ceph-csi-rbd`.
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**Deploy Helm Chart:**
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[See the Helm chart readme for installation instructions.](../charts/ceph-csi-rbd/README.md)
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## Encryption for RBD volumes
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> Enabling encryption on volumes created without encryption is **not supported**
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>
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> Enabling encryption for storage class that has PVs created without encryption
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> is **not supported**
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Volumes provisioned with Ceph RBD do not have encryption by default. It is
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possible to encrypt them with ceph-csi by using LUKS encryption.
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### Life-cycle for encrypted volumes
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**Create volume**:
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* create volume request received
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* volume requested to be created in Ceph
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* new passphrase is generated and stored in selected KMS if KMS is in use
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* encrypted state "encryptionPrepared" is saved in image-meta in Ceph
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**Attach volume**:
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* attach volume request received
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* volume is attached to provisioner container
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* on first time attachment
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(no file system on the attached device, checked with blkid)
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* passphrase is retrieved from selected KMS if KMS is in use
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* device is encrypted with LUKS using a passphrase from K8s Secret or KMS
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* image-meta updated to "encrypted" in Ceph
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* passphrase is retrieved from selected KMS if KMS is in use
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* device is open and device path is changed to use a mapper device
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* mapper device is used instead of original one with usual workflow
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**Detach volume**:
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* mapper device closed and device path changed to original volume path
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* volume is detached as usual
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* passphrase removed from KMS if needed (with failures ignored)
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### Encryption configuration
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To encrypt rbd volumes with LUKS you need to set encryption passphrase in
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secrets under `encryptionPassphrase` key and switch `encrypted` option in
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StorageClass to `"true"`. This is not supported for storage classes that already
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have PVs provisioned. The `node-stage-secret-name` and the `provisioner-secret-name`
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should carry this key and value for encryption to work.
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To use different passphrase you need to have different storage classes and point
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to a different K8s secrets `csi.storage.k8s.io/node-stage-secret-name`
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and `csi.storage.k8s.io/provisioner-secret-name` which carry new passphrase value
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for `encryptionPassphrase` key in these secrets.
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### Encryption `metadata` configuration
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CephCSI can generate unique passphrase (DEK Data-Encryption-Key) for each volume
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to be used to encrypt/decrypt data. The passphrase (DEK) is encrypted by
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`encryptionPassphrase` (KEK Key-Encryption-Key) and stored in the image metadata
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of the volume.
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To encrypt rbd volumes with `metadata` encryption, users need to set
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`encrypted: "true"` and `encryptionKMSID` to a unique identifier in storageclass.
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This unique identifier should be similar to the
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[examples](../examples/kms/vault/csi-kms-connection-details.yaml).
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The configuration must include `"encryptionKMSType": "metadata"`. The
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`encryptionPassphrase` is fetched based on the following conditions:
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* if `"secretName"` key is specified, `encryptionPassphrase` is fetched from this
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secret and `"secretNamespace"` value is used for namespace if specified else
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Tenant/Kubernetes namespace (i.e., namespace where the PVC was created) is used.
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* if `"secretName"` key is not specified, `encryptionPassphrase` is fetched from
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storageclass secrets `csi.storage.k8s.io/provisioner-secret-namespace` /
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`csi.storage.k8s.io/provisioner-secret-name` and
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`csi.storage.k8s.io/node-stage-secret-namespace` /
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`csi.storage.k8s.io/node-stage-secret-name`
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similar to the previous [Encryption Configuration](#encryption-configuration).
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### Encryption KMS configuration
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To further improve security robustness it is possible to use unique passphrases
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generated for each volume and stored in a Key Management System (KMS). Currently
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HashiCorp Vault is the only KMS supported.
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There are two options to use Hashicorp Vault as a KMS:
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1. with Kubernetes ServiceAccount
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1. with a Vault Token per Tenant (a Kubernetes Namespace)
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To use Vault as KMS set `encryptionKMSID` to a unique identifier for Vault
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configuration. You will also need to create vault configuration similar to the
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[example](../examples/kms/vault/kms-config.yaml) and use same
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`encryptionKMSID`.
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To use the Kubernetes ServiceAccount to access Vault, the configuration must
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include `encryptionKMSType: "vault"`. If Tenants are expected to place their
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Vault Token in a Kubernetes Secret in their Namespace, set `encryptionKMSType:
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"vaulttokens"`.
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In order for ceph-csi to be able to access the configuration you will need to
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have it mounted to csi-rbdplugin containers in both daemonset (so kms client
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can be instantiated to encrypt/decrypt volumes) and deployment pods (so kms
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client can be instantiated to delete passphrase on volume delete)
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`ceph-csi-encryption-kms-config` configmap.
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> Note: kms configuration must be a map of string values only
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> (`map[string]string`) so for numerical and boolean values make sure to put
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> quotes around.
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When the Tenants need to provide their own Vault Token, they will need to place
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it in a Kubernetes Secret (by default) called `ceph-csi-kms-token`, where the
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Vault Token is stored in the `token` key as shown in [the
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example](../examples/kms/vault/tenant-token.yaml).
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#### Configuring HashiCorp Vault with a single Kubernetes ServiceAccount
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Using Vault as KMS you need to configure Kubernetes authentication method as
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described in [official
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documentation](https://www.vaultproject.io/docs/auth/kubernetes.html).
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If token reviewer is used, you will need to configure service account for
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that also like in
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[example](../examples/kms/vault/csi-vaulttokenreview-rbac.yaml) to be able to
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review jwt tokens.
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Configure a role(s) for service accounts used for ceph-csi:
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* provisioner service account (`rbd-csi-provisioner`) requires only **delete**
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permissions to delete passphrases on PVC delete
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* nodeplugin service account (`rbd-csi-nodeplugin`) requires **create** and
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**read** permissions to save new keys and retrieve existing
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#### Configuring Hashicorp Vault with a ServiceAccount per Tenant
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For deployments where a single ServiceAccount for accessing Hashicorp Vault is
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not suitable, it is possible to configure a ServiceAccount per Tenant to access
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the KMS. In order to configure this, each Tenant will need to have its own
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ServiceAccount in the Kubernetes Namespace where the volumes are created. The
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ServiceAccount is expected to be called `ceph-csi-vault-sa` by default. This
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can be changed by setting the `tenantSAName` option to a different value. An
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example of the global configuration that can be done in the Kubernetes
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Namespace where Ceph-CSI is deployed can be found in
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[`kms-config.yaml`](../examples/kms/vault/kms-config.yaml) where the
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`encryptionKMSType` is set to `vaulttenantsa`.
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Most notably, the Vault Tokens KMS configuration can be used, without the Token
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configuration, but with added `tenantSAName` and `vaultRole` options.
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Tenants do have the ability to reconfigure parts of the connection details to
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the Vault service. It will often be required to set the backend path to a
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location where the Tenant can manage the secrets. These changes can be done by
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placing a ConfigMap called `ceph-csi-kms-config` in the Tenants Namespace, an
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[example](../examples/kms/vault/tenant-sa.yaml) is available.
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As each ServiceAccount needs to be added to the Vault configuration, the
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administrator of the service will need to apply the permissions by creating a
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Vault Policy that allows a ServiceAccount to access a key-value store in the
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KMS. In the Ceph-CSI automated testing, there is [a Kubernetes Job that sets
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this up](../examples/kms/vault/tenant-token.yaml) for a single Tenant that uses
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the Kubernetes Namespace `tenant`.
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#### Configuring Amazon KMS
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Amazon KMS can be used to encrypt and decrypt the passphrases that are used for
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encrypted RBD images. When a volume is created, a passphrase will be generated,
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which will be encrypted by the KMS and stored in the volumes metadata. Upon
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attaching the volume to a Pod, the worker node requests the KMS to decrypt the
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passphrase, after which it can be used to open the device with `cryptsetup` and
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provide access to it for the Pod.
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There are a few settings that need to be included in the [KMS configuration
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file](../examples/kms/vault/kms-config.yaml):
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1. `KMS_PROVIDER`: should be set to `aws-metadata`.
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1. `KMS_SECRET_NAME`: name of the Kubernetes Secret (in the Namespace where
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Ceph-CSI is deployed) which contains the credentials for communicating with
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AWS. This defaults to `ceph-csi-aws-credentials`.
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1. `AWS_REGION`: the region where the AWS KMS service is available.
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The [Secret with credentials](../examples/kms/vault/aws-credentials.yaml) for
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the AWS KMS is expected to contain:
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1. `AWS_ACCESS_KEY_ID`: ID of the key to use for encrypting/decrypting
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1. `AWS_SECRET_ACCESS_KEY`: secret for the key to use
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1. `AWS_SESSION_TOKEN`: *(optional)* session token, usually empty
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1. `AWS_CMK_ARN`: Custom Master Key, ARN for the key used to encrypt the
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passphrase
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This Secret is expected to be created by the administrator who deployed
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Ceph-CSI.
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### Encryption prerequisites
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In order for encryption to work you need to make sure that `dm-crypt` kernel
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module is enabled on the nodes running ceph-csi attachers.
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If custom image is built for the rbd-plugin instance, make sure that it contains
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`cryptsetup` tool installed to be able to use encryption.
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