[BUG] Unable to attach RWX to a node using Longhorn UI

[khushboo-rancher]

Describe the bug
RWX volume doesn't attach to a node when attach request is sent by Longhorn UI.

To Reproduce
Steps to reproduce the behavior:

1. Create a RWX volume using Longhorn UI.
2. Create PV/PVC for that volume.
3. Click attach and select a node.
4. The volume doesn't get attached to the node.

Expected behavior
The volume should get attached to the node.

Log
I don't see Longhorn-manager logs after the attach request. [longhorn-manager-hntrh] 122.171.150.151 - - [29/Mar/2021:17:10:20 +0000] "POST /v1/volumes/volume-test-1?action=attach HTTP/1.1" 200 2581 "https://khushlh.qa.rancher.space/k8s/clusters/c-55pdb/api/v1/namespaces/longhorn-system/services/http:longhorn-frontend:80/proxy/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 11_2_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.90 Safari/537.36" for a rwx volume.
longhorn-support-bundle_8b98a2bd-3a47-4227-b8d0-850802e78cf2_2021-03-29T17-11-48Z.zip

Volume name - volume-test-1, pvc-Dd90b31b-81e0-4985-835b-90afe7cbd02f

Environment:

• Longhorn version: Longhorn master - 03/29/2021

Additional context
Attachment through the Longhorn UI for RWO volumes is working fine.

[joshimoo]

RWX volumes can only be manually attached in maintenance mode, otherwise they are controlled by the share-manager.

[khushboo-rancher]

@joshimoo Thanks for clarifying this behavior change from v1.1.0 to master. Do you think we should show a message on the Longhorn UI in this case?

[innobead]

cc @smallteeths

[smallteeths]

The ui can be modified in this way. Selected by default and disabled Maintenance radio When manually attaching rwx volume.

Is this okay? @innobead @joshimoo @khushboo-rancher

[innobead]

The ui can be modified in this way. Selected by default and disabled Maintenance radio When manually attaching rwx volume.

Is this okay? @innobead @joshimoo @khushboo-rancher

It sounds good to me. For the explanation purpose, do we have any tip style of message for this kind of enforced behavior like function disabled by default? ex: some message text next to the check box.

[khushboo-rancher]

Verified with Longhorn-master -04/03/2021

Validation - Pass

User can attach RWX only in maintenance mode. UI shows the message on clicking the attach button. Validated the single and multiple volume attach scenarios.