Enable the ceph-csi driver by default #3562

travisn · 2019-08-01T23:00:04Z

Description of your changes:
A key feature of the v1.1 release will be that the CSI driver is the recommended driver to replace the flex driver. For now both drivers are supported, but it is anticipated that the flex driver will be deprecated soon both by Rook and K8s.

The changes here include:

Include the CSI RBAC in common.yaml
Enable the CSI rbd and cephfs drivers by default in operator.yaml
Updated the documentation such that the CSI driver is used by default. The flex docs are essentially a footnote.
Example storage classes for flex and csi are moved to the appropriate example folders.
Removed the CSI default images from the operator.yaml. The officially supported version of CSI is the default version baked into Rook. Specifying a version of the CSI driver is still possible, but not officially supported.
Automatically generate the admin key in a secret to be used by a storageclass
The flex agent can be disabled if only the CSI driver is needed.
The discovery daemons can be disabled if watching for devices is not needed (this is tangential to the CSI driver, but simple to change at the same time)
Remove csi default settings from yaml
The helm chart includes installing the CSI driver by default
Helm chart and operator.yaml options available for whether to install the drivers

@phlogistonjohn I'm sure we will have some conflicts to resolve with #3373

Checklist:

Reviewed the developer guide on Submitting a Pull Request
Documentation has been updated, if necessary.
Unit tests have been added, if necessary.
Integration tests have been added, if necessary.
Pending release notes updated with breaking and/or notable changes, if necessary.
Upgrade from previous release is tested and upgrade user guide is updated, if necessary.
Code generation (make codegen) has been run to update object specifications, if necessary.
Comments have been added or updated based on the standards set in CONTRIBUTING.md
Add the flag for skipping the CI if this PR does not require a build. See here for more details.

In order for the osd service account to reference the cephcluster CR in the owner references, OpenShift requires access to the CephCluster CRD. This adds the minimal changes needed to appease OpenShift. Signed-off-by: travisn <tnielsen@redhat.com>

Madhu-1 · 2019-08-05T03:28:29Z

Documentation/ceph-csi-drivers.md

-cluster.
+There are two CSI drivers integrated with Rook that will enable different scenarios:
+- RBD: This driver is optimized for RWO pod access where only one pod may access the storage
+- CephFS: This driver allows for RWX with one or more pods accessing the same storage


do we need to mention that users can also use RWX with rbd with and RWO with cephfs?

Good question on the messaging. If you use RWX with rbd you're at risk of data corruption unless the application layer manages the locks. Are there CSI docs we could link to that show all the use cases?

Madhu-1 · 2019-08-05T03:31:53Z

Documentation/ceph-csi-drivers.md

@@ -303,7 +72,7 @@ NAME               AGE
 rbd-pvc-snapshot   6s
 ```

-In one of your Ceph pod, run `rbd snap ls [name-of-your-pvc]`.
+In the toolbox pod, run `rbd snap ls [name-of-your-pvc]`.


just to mention we are not creating the rbd image with the same name as PVC we need to fix this. this can be done as separate PR

Documentation/ceph-csi-drivers.md

Madhu-1 · 2019-08-05T03:46:23Z

Documentation/ceph-filesystem.md

+  name: cephfs-pvc
+spec:
+  accessModes:
+  - ReadWriteOnce


Question, as this is ReadWriteOnce, better to use RBD for this use-case?

in kube-registry.yaml looks like it is ReadWriteMany

Good catch, it should be ReadWriteMany. I had changed it already in the example yaml, but missed updating this doc.

Madhu-1 · 2019-08-05T03:59:17Z

cmd/rook/ceph/operator.go

@@ -43,6 +43,9 @@ func init() {
 	operatorCmd.Flags().DurationVar(&mon.HealthCheckInterval, "mon-healthcheck-interval", mon.HealthCheckInterval, "mon health check interval (duration)")
 	operatorCmd.Flags().DurationVar(&mon.MonOutTimeout, "mon-out-timeout", mon.MonOutTimeout, "mon out timeout (duration)")

+	operatorCmd.Flags().BoolVar(&operator.EnableFlexDriver, "enable-flex-driver", true, "enable the rook flex driver")
+	operatorCmd.Flags().BoolVar(&operator.EnableDiscoveryDaemon, "enable-discovery-daemon", true, "enable the rook discovery daemon")
+
 	operatorCmd.Flags().BoolVar(&csi.EnableRBD, "csi-enable-rbd", false, "enable ceph-csi rbd support")


can we change the default value to true for both cephfs and rbd flags?

Right, I'll change these to true, good catch.

Madhu-1 · 2019-08-05T04:01:48Z

pkg/operator/ceph/cluster/mon/config.go

+			Name:      "rook-ceph-csi",
+			Namespace: namespace,
+		},
+		Data: csiSecrets,


can we use stringData instead of Data? we can skip []byte conversion above

@netzzer has reported that to work on OpenShift she has seen that Data is required, while StringData fails. I don't recall the details though.

for confirmation:
@nehaberry are you using stringData or Data in secret in OCP

@Madhu-1 yes we are using "StrinData" in the yaml. Once the resource is created, it automatically shows up as Data with base64 encoded value;

Tested on both OCP 4.1 and OCP 4.2

$ oc get clusterversion
NAME VERSION AVAILABLE PROGRESSING SINCE STATUS
version 4.2.0-0.ci-2019-08-04-210315 True False 25h Error while reconciling 4.2.0-0.ci-2019-08-04-210315: the cluster operator monitoring is degraded

e.g.

1. Noted the key for admin

sh-4.2# ceph auth get-key client.admin
AQD1wUdd8KNCOBAA+R58MhsIODdSKL8WakpXCA==sh-4.2#

2. Created the secret yaml

$ cat /tmp/Secretti_vr_p_
apiVersion: v1
kind: Secret
metadata:
name: secret-test-rbd-0512275256
namespace: openshift-storage
stringData:
userID: admin
userKey: AQD1wUdd8KNCOBAA+R58MhsIODdSKL8WakpXCA==

3. Created the secret :

oc -n openshift-storage --kubeconfig /home/nberry/aws-install/aug5-1/auth/kubeconfig create -f /tmp/Secretti_vr_p_ -o yaml

5. Verified the data in created secret

$ oc get secret secret-test-rbd-0512275256 -n openshift-storage -o yaml
apiVersion: v1
data:
userID: YWRtaW4=
userKey: QVFEMXdVZGQ4S05DT0JBQStSNThNaHNJT0RkU0tMOFdha3BYQ0E9PQ==
kind: Secret
metadata:
creationTimestamp: "2019-08-05T06:57:53Z"
name: secret-test-rbd-0512275256
namespace: openshift-storage
resourceVersion: "41528"
selfLink: /api/v1/namespaces/openshift-storage/secrets/secret-test-rbd-0512275256
uid: 58ba319a-b74e-11e9-8637-06e8dff050ca
type: Opaque

6. Able to create pvc

$ oc get sc storageclass-test-rbd-0512280619 -o yaml
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
creationTimestamp: "2019-08-05T06:58:07Z"
name: storageclass-test-rbd-0512280619
resourceVersion: "41607"
selfLink: /apis/storage.k8s.io/v1/storageclasses/storageclass-test-rbd-0512280619
uid: 60f0ac13-b74e-11e9-b036-0284beed546e
parameters:
clusterID: openshift-storage
csi.storage.k8s.io/node-stage-secret-name: secret-test-rbd-0512275256
csi.storage.k8s.io/node-stage-secret-namespace: openshift-storage
csi.storage.k8s.io/provisioner-secret-name: secret-test-rbd-0512275256
csi.storage.k8s.io/provisioner-secret-namespace: openshift-storage
imageFeatures: layering
imageFormat: "2"
pool: cbp-test-0512275940
provisioner: rbd.csi.ceph.com
reclaimPolicy: Delete
volumeBindingMode: Immediate

When using the client-go in rook, the api will do the base64 coding automatically so it should be the same either way for rook to use data or stringData. I'll stick with data since that's what I tested and is working.

Madhu-1 · 2019-08-05T04:03:54Z

pkg/operator/ceph/operator.go

+	if EnableDiscoveryDaemon {
+		rookDiscover := discover.New(o.context.Clientset)
+		if err := rookDiscover.Start(namespace, o.rookImage, o.securityAccount); err != nil {
+			return fmt.Errorf("Error starting device discovery daemonset: %v", err)


need to change Error to error

humblec · 2019-08-05T04:51:40Z

Documentation/ceph-block.md

-# Optional, default reclaimPolicy is "Delete". Other options are: "Retain", "Recycle" as documented in https://kubernetes.io/docs/concepts/storage/storage-classes/
-reclaimPolicy: Retain
+    # clusterID is the namespace where the rook cluster is running
+    clusterID: rook-ceph


Eventhough this can be any string it should be a unique identifier of the cluster. Atleast I used to put fs id in this field. Not sure rook-ceph can cause confusion that , people think its the namespace name :)

The storage class for the rook flex driver has used the namespace as the unique identifier for the correct rook instance to be found. It is the simplest concept, so why not use it? With one csi driver per operator (#3373), the driver will also correspond to the operator in that namespace and the clusterID should correspond to that name of the driver, correct?

The overall question is: What does the user need to set this to? I'm hoping he isn't required to go look up the fsid.

humblec · 2019-08-05T04:52:45Z

Documentation/ceph-csi-drivers.md


 Since this feature is still in [alpha
 stage](https://kubernetes.io/blog/2018/10/09/introducing-volume-snapshot-alpha-for-kubernetes/)
 (k8s 1.12+), make sure to enable `VolumeSnapshotDataSource` feature gate in
 your Kubernetes cluster.

-#### create RBD snapshot-class
+### SnapshotClass


Do we need to mention about SnapshotClass as snapshot support is in alpha state. @Madhu-1 what do you think?

Sounds good as a separate PR.

humblec · 2019-08-05T04:53:22Z

Documentation/ceph-examples.md

@@ -13,12 +13,12 @@ indent: true

 # Ceph Examples

-Configuration for Rook and Ceph can be configured in multiple ways to provide block devices, shared file system volumes or object storage in a kubernetes namespace. We have provided several examples to simplify storage setup, but remember there are many tunables and you will need to decide what settings work for your use case and environment. 
+Configuration for Rook and Ceph can be configured in multiple ways to provide block devices, shared file system volumes or object storage in a kubernetes namespace. We have provided several examples to simplify storage setup, but remember there are many tunables and you will need to decide what settings work for your use case and environment.


The object storage is not coming through the CSI driver. Do we need to mention it here?

I don't think this page needs to talk about the CSI driver, it's just giving details about the example manifests.

humblec · 2019-08-05T04:54:51Z

Documentation/ceph-examples.md

@@ -56,9 +52,13 @@ Now we are ready to setup [block](https://ceph.com/ceph-storage/block-storage/),
 Ceph can provide raw block device volumes to pods. Each example below sets up a storage class which can then be used to provision a block device in kubernetes pods. The storage class is defined with [a pool](http://docs.ceph.com/docs/nautilus/rados/operations/pools/) which defines the level of data redundancy in ceph:

 - `storageclass.yaml`: This example illustrates replication of 3 for production scenarios and requires at least three nodes. Your data is replicated on three different kubernetes worker nodes and intermittent or long-lasting single node failures will not result in data unavailability or loss.
- `storageclass-ec.yaml`: Configures erasure coding for data durability rather than replication. [Ceph's erasure coding](http://docs.ceph.com/docs/nautilus/rados/operations/erasure-code/) is more efficient than replication so you can get high reliability without the 3x replication cost of the preceding example (but at the cost of higher computational encoding and decoding costs on the worker nodes). Erasure coding requires at least three nodes. See the [Erasure coding](ceph-pool-crd.md#erasure-coded) documentation for more details. 
+- `storageclass-ec.yaml`: Configures erasure coding for data durability rather than replication. [Ceph's erasure coding](http://docs.ceph.com/docs/nautilus/rados/operations/erasure-code/) is more efficient than replication so you can get high reliability without the 3x replication cost of the preceding example (but at the cost of higher computational encoding and decoding costs on the worker nodes). Erasure coding requires at least three nodes. See the [Erasure coding](ceph-pool-crd.md#erasure-coded) documentation for more details.


I really doubt any one has tested EC SC with CSI driver. The option is available, but may be its good to have a warning that, its an experiment feature ? :)

EC still only works with the flex driver. I'll add a comment about this.

humblec · 2019-08-05T04:55:48Z

Documentation/ceph-filesystem.md

+
+reclaimPolicy: Delete
+mountOptions:
+  - noexec


@travisn I put that option in my patch and forgot to change here. Lets mention debug can as the mount option here.

Is this what you're saying?

mountOptions: - noexec # Uncomment the following line for debugging #- debug

instead of noexec put debug

Ok i'll add debug and remove noexec. What is the behavior of the debug option? More logging?

mountOptions: - debug

humblec · 2019-08-05T04:57:43Z

pkg/operator/ceph/cluster/mon/config.go

+		Type: k8sutil.RookType,
+	}
+	k8sutil.SetOwnerRef(&csiSecret.ObjectMeta, ownerRef)
+	if _, err = clientset.CoreV1().Secrets(namespace).Create(csiSecret); err != nil {


@travisn its good to validate the err for isAlreadyExist.

Yes, nice catch

humblec · 2019-08-05T04:58:39Z

pkg/operator/ceph/operator.go

@@ -56,6 +56,12 @@ var provisionerConfigs = map[string]string{
 	provisionerNameLegacy: flexvolume.FlexvolumeVendorLegacy,
 }

+// Whether to enable the flex driver
+var (
+	EnableFlexDriver      = true


@travisn can we also mention, what are meant by these vars?

ShyamsundarR

@travisn most comments here are queries as I do not have the expertise on where else changes need to be made in Rook code etc. So please treat them as such.

If I understand the documentation changes intent, the idea is that everything is setup by Rook (CSI pods, secrets, configuration etc.) and it just deals with how to create a storage class to consume the same, would this be correct? As it skips a lot of the details about CSI itself (which is good).

ShyamsundarR · 2019-08-05T14:34:25Z

pkg/operator/ceph/csi/spec.go

-	DefaultAttacherImage    = "quay.io/k8scsi/csi-attacher:v1.1.0"
-	DefaultSnapshotterImage = "quay.io/k8scsi/csi-snapshotter:v1.1.1"
+	DefaultAttacherImage    = "quay.io/k8scsi/csi-attacher:v1.1.1"
+	DefaultSnapshotterImage = "quay.io/k8scsi/csi-snapshotter:v1.1.0"


(suggestion) Ceph-CSI master (soon to be 2.0.0 version) uses csi-snapshotter version 1.1.0 for kube-v1.13 and 1.2.0 for kube-v1.14. Should we consider pushing it up to the same versions? Tagging @Madhu-1 for comments on the same. (similarly provisioner is 1.3.0 at present)

Also, we need a mechanism to keep Rook up to date with changes to CSI related pod spec in the future (jotting it down here for now)

A couple thoughts:

We should start the appropriate automatically by default. If there is a different version depending on the K8s version, then we can detect that and make the right decision.

The admin can specify the desired images in operator.yaml. If they specify the images in operator.yaml, they should override our defaults.

Would you open a separate issue on this?

csi-snapshotter 1.1.0 and 1.2.0 is having breaking changes.
v1.2.0 requires minimum Kube version of 1.14+

I think we can pick the image version based on the Kube version deployed, this can be done as separate PR.

@travisn some image version updating requires rbac changes also.

@Madhu-1 You're saying the newer snapshotter image requires rbac changes? Sounds fine to just add them to common.yaml with the other rbac.

ShyamsundarR · 2019-08-05T14:34:43Z

pkg/operator/ceph/csi/spec.go

@@ -58,16 +58,14 @@ const (
 	DefaultCSIPluginImage   = "quay.io/cephcsi/cephcsi:canary"
 	DefaultRegistrarImage   = "quay.io/k8scsi/csi-node-driver-registrar:v1.1.0"
 	DefaultProvisionerImage = "quay.io/k8scsi/csi-provisioner:v1.2.0"
-	DefaultAttacherImage    = "quay.io/k8scsi/csi-attacher:v1.1.0"
-	DefaultSnapshotterImage = "quay.io/k8scsi/csi-snapshotter:v1.1.1"
+	DefaultAttacherImage    = "quay.io/k8scsi/csi-attacher:v1.1.1"


(suggestion) Ceph-CSI master (soon to be 2.0.0 version) uses csi-attacher version 1.2.0 (both for kubev1.13 and 1.14+). Change it to match the same?

How about if we update that in a separate PR? These image tags were wrong to even get it working for now, this is just the minimal fix.

I will send a PR to enable leader election as per ceph-csi PR ceph/ceph-csi#497 , before that I need to make sure things are working fine in OCP with leader election

ShyamsundarR · 2019-08-05T14:52:23Z

pkg/operator/ceph/cluster/mon/config.go

+	csiSecret := &v1.Secret{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      "rook-ceph-csi",
+			Namespace: namespace,


(query) The namespace here is the cluster namespace and not the operator namespace, right?

Asking as one of the intentions of multi-cluster support by the same operator, was to retain the CSI pods and config map in the operator namespace, but secrets need not be in the same namespace (operator ns) and will (obviously as the name is "rook-ceph-csi") conflict if done so.

(traced code and see that this uses the cluster based namespace, but asking the query anyway)

#3373 will fix the issue of the operator keeping track of the multi-cluster support in the same namespace as the operator. That will use the configmap rook-ceph-csi-config, while this new secret is called rook-ceph-csi, so they are different resources. This secret is created so a storage class can reference the secret for a cluster. Really this is to automate #3387

Madhu-1

LGTM

humblec · 2019-08-07T06:38:21Z

/lgtm.

Thanks @travisn

galexrt · 2019-08-07T07:04:30Z

Documentation/ceph-block.md

-This is because the `replicated.size: 3` will require at least 3 OSDs and as [`failureDomain` setting](ceph-pool-crd.md#spec) to `host` (default), each OSD needs to be on a different nodes.
+This is because the `replicated.size: 3` will require at least 3 OSDs and as [`failureDomain` setting](ceph-pool-crd.md#spec) to `host` (default), each OSD needs to be on a different node.
+
+**NOTE** This example uses the CSI driver, which is the preferred driver going forward. Examples are found in the [CSI RBD](https://github.com/rook/rook/tree/{{ branchName }}/cluster/examples/kubernetes/ceph/csi/rbd) directory. For an example of a storage class using the flex driver, see the [Flex Driver](#flex-driver) section below, which has examples in the [flex](https://github.com/rook/rook/tree/{{ branchName }}/cluster/examples/kubernetes/ceph/flex) directory.


How about adding an additional note that only Kubernetes >=1.13 is supporting CSI out of the box (GA status).

@galexrt Comments added about 1.13. Now it reads:

**NOTE** This example uses the CSI driver, which is the preferred driver going forward for K8s 1.13 and newer. Examples are found in the CSI RBD directory. For an example of a storage class using the flex driver (required for K8s 1.12 or earlier), see the Flex Driver section below, which has examples in the flex directory.

CSI is now the preferred storage driver for Rook. By default both the CSI and flex drivers will be started by the operator. In a future release the flex driver will be deprecated, but for now is still supported. The drivers can be disabled with an environment variable in the operator deployment in operator.yaml. If users are only using one driver or the other there is no need to enable both drivers. Signed-off-by: travisn <tnielsen@redhat.com>

The version of the csi driver to be installed that is officially supported is the default baked into rook. If a different version needs to be specified, it is officially unsupported. Therefore, we leave the csi driver version settings unspecified in operator.yaml so we can officially support the defaults. Signed-off-by: travisn <tnielsen@redhat.com>

The flex driver does not need to be started if only the CSI drivers are going to be used. Therefore, we allow the admin to stop launching the rook flex agent with the setting ROOK_ENABLE_FLEX_DRIVER in operator.yaml Signed-off-by: travisn <tnielsen@redhat.com>

The discovery daemon is only necessary to be run when OSDs are being created on raw devices and detect when new devices are added to the cluster. If OSDs do not need to be configured on devices, the discovery daemonset has no need to be started. Signed-off-by: travisn <tnielsen@redhat.com>

The CSI driver requires the ceph key for administrating the cluster. The key is stored in a secret and specified in the storage class. The operator will now automatically generate a secret named rook-ceph-csi that can be specified by default in the storage class instead of requiring the admin to create it. Signed-off-by: travisn <tnielsen@redhat.com>

galexrt · 2019-08-07T07:07:56Z

Documentation/ceph-block.md

@@ -114,6 +120,44 @@ kubectl delete -n rook-ceph cephblockpools.ceph.rook.io replicapool
 kubectl delete storageclass rook-ceph-block
 ```

+## Flex Driver


Do we still want to list flexvolume driver here?

Users on 1.12 or earlier still need the flex driver. Does it need more explanation in this section?

Nah that should be fine then. Let's hope the users will read the above note then :-)

galexrt · 2019-08-07T07:09:20Z

Documentation/ceph-block.md

+spec:
+  failureDomain: host
+  replicated:
+    size: 3


As we have size: 3 here, should there be a note that this is for production and people hopefully don't try it in Minikube?

There is a note higher on the page about the replication. Think we need to repeat it here?

Same here. Let's keep it as is and change it later if we see that people don't keep the higher note in mind.

travisn changed the title ~~Enable the ceph-csi driver by default~~ WIP: Enable the ceph-csi driver by default Aug 1, 2019

travisn mentioned this pull request Aug 2, 2019

OCS Manifest files specific to OpenShift KNI clusters openshift-kni/install-scripts#10

Merged

travisn force-pushed the enable-csi-driver branch from 6e0bc33 to 1f3b04d Compare August 2, 2019 22:02

travisn force-pushed the enable-csi-driver branch from 1f3b04d to afc338f Compare August 2, 2019 23:15

travisn changed the title ~~WIP: Enable the ceph-csi driver by default~~ Enable the ceph-csi driver by default Aug 2, 2019

travisn force-pushed the enable-csi-driver branch from afc338f to c1d0909 Compare August 2, 2019 23:21

travisn requested review from Madhu-1 and ShyamsundarR August 2, 2019 23:27

travisn force-pushed the enable-csi-driver branch 2 times, most recently from efd34b8 to 6823847 Compare August 3, 2019 16:43

Madhu-1 reviewed Aug 5, 2019

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humblec reviewed Aug 5, 2019

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ShyamsundarR reviewed Aug 5, 2019

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BlaineEXE added ceph main ceph tag csi labels Aug 5, 2019

BlaineEXE added this to the 1.1 milestone Aug 5, 2019

Madhu-1 approved these changes Aug 7, 2019

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galexrt reviewed Aug 7, 2019

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travisn added 5 commits August 7, 2019 10:00

travisn force-pushed the enable-csi-driver branch from e8ad3cb to da8332a Compare August 7, 2019 16:04

galexrt reviewed Aug 7, 2019

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galexrt approved these changes Aug 7, 2019

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travisn merged commit 0a79c82 into rook:master Aug 7, 2019

travisn deleted the enable-csi-driver branch August 7, 2019 17:53

nehaberry mentioned this pull request Aug 8, 2019

Updated the Deployment yamls and Deployment.py based on rook repo changes red-hat-storage/ocs-ci#537

Merged

travisn mentioned this pull request Aug 9, 2019

Fix-ceph-common-example #3584

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9 tasks

ajarr mentioned this pull request Aug 14, 2019

CephFS volumes handling via PVCs (dynamic provisioning) #1125

Closed

Enable the ceph-csi driver by default #3562

Enable the ceph-csi driver by default #3562

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