[BUG]: unable to install the UNITY driver in NAT Env

[suryagupta4]

Bug Description

Customer has NAT between K8S cluster and Unity. They tried to install either 2.7 or 2.10, faced the same error "Error: authenticate error. Response: ParseJSONError: invalid character '<' looking for beginning of value" "

From secret.yaml, there are two Unitys. Both of them are failed to probe during the login session.

$ kubectl -n unity get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
unity-controller-6f6dccb4c8-4lbf2 1/4 CrashLoopBackOff 30 (2m39s ago) 29m x.x.x.x apis-gdc-run-khn12v
unity-controller-6f6dccb4c8-rkdrd 1/4 CrashLoopBackOff 30 (2m27s ago) 29m x.x.x.x apis-gdc-run-khn13v
unity-node-7hn8b 1/2 CrashLoopBackOff 10 (98s ago) 29m x.x.x.x apis-gdc-run-khn11v
unity-node-kfc7q 1/2 CrashLoopBackOff 10 (103s ago) 29m x.x.x.x apis-gdc-run-khn13v
unity-node-zndj8 1/2 CrashLoopBackOff 10 (114s ago) 29m x.x.x.x apis-gdc-run-khn12v

Logs

time="2024-04-23T02:28:15Z" level=debug msg="Response code:403 for url: /api/types/loginSessionInfo" func="github.com/dell/gounity/api.(*client).DoAndGetResponseBody()" file="dell/gounity@v1.17.0/api/restclient.go:306"
time="2024-04-23T02:28:15Z" level=debug msg="Authentication response code: 403" func="github.com/dell/gounity.(*Client).Authenticate()" file="dell/gounity@v1.17.0/unityclient.go:79"
time="2024-04-23T02:28:15Z" level=error arrayid=de414234264011 runid=48 msg="Unity authentication failed for array de414234264011 error: authenticate error. Response: ParseJSONError: invalid character '<' looking for beginning of value" func="github.com/dell/csi-unity/service.singleArrayProbe()" file="/go/src/csi-unity/service/service.go:792"
time="2024-04-23T02:28:15Z" level=error  runid=48 msg="Probe failed for array ArrayID: xxxxxxxxx, Username: admin, Endpoint: https:x.x.x.x, SkipCertificateValidation: 0xc0000132aa, IsDefaultArray:false, IsProbeSuccess:false, IsHostAdded:false error:rpc error: code = FailedPrecondition desc =  runid=48 Unable to login to Unity. Verify hostname/IP Address of unity. Error: authenticate error. Response: ParseJSONError: invalid character '<' looking for beginning of value" func="github.com/dell/csi-unity/service.(*service).probe()" file="/go/src/csi-unity/service/service.go:825"

Screenshots

No response

Additional Environment Information

Unity array is NAT enabled

Steps to Reproduce

Install driver in NAT enabled. Driver pods will run into CrashLoopBackOff.

Expected Behavior

Driver pods should be running fine.

CSM Driver(s)

CSI-Unity

Installation Type

No response

Container Storage Modules Enabled

No response

Container Orchestrator

Anthos on berametal with K8S version v1.27.7-gke.1400

Operating System

RHEL

[suryagupta4]

Unity does not support NAT for management IP, only supports NFS IP. Documentation needs to be updated with proper support information.
https://dell.github.io/csm-docs/docs/csidriver/features/unity/#nat-support

[suryagupta4]

link: 24053