bug: vm is not created for a direct download setup

[tampler]

ISSUE TYPE

• Bug Report
• Improvement Request

COMPONENT NAME

Core, UI

CLOUDSTACK VERSION

 4.20.0.0-snapshot.20240928

CONFIGURATION

KVM, Advanced zone, Linstor Primary, NFS Secondary, Alpine Linux ISO setup with a "Direct Download" knob

OS / ENVIRONMENT

Ubuntu 24.04.1

SUMMARY

VM won't start for an ISO installed with the "direct download" feature. The full log is here

STEPS TO REPRODUCE

- Install ACS
- Setup an Advanced Zone
- Add a KVM host
- Prepare/test/validate Linstor cluster
- Create Primary Storage with Linstor
- Create Secondary Storage with NFS
- Start a zone
- Make sure to run 2 SytemVMs
- Create a VPC
- Create a VPC network
- Install Alpine Linux ISO with the "Direct Download" feature
- Create and run VM

EXPECTED RESULTS

VM is created

ACTUAL RESULTS

VM create fails with the following error: Unable to complete AsyncJobVO: {id:42, userId: 2, accountId: 2, instanceType: null, instanceId: null, cmd: com.cloud.vm.VmWorkStart, cmdInfo: XRocmVzaG9sZHhwP0AAAAAAAAx3CAAAABAAAAABdAAKVm1QYXNzd29yZHQAHHJPMEFCWFFBRG5OaGRtVmtYM0JoYzNOM2IzSmt4cA, cmdVersion: 0, status: IN_PROGRESS, processStatus: 0, resultCode: 0, result: null, initMsid: 178597682375863, completeMsid: null, lastUpdated: null, lastPolled: null, created: Sat Oct 05 20:42:39 MSK 2024, removed: null}, job origin: 41 java.lang.ClassCastException: class com.cloud.agent.api.Answer cannot be cast to class org.apache.cloudstack.agent.directdownload.DirectDownloadAnswer (com.cloud.agent.api.Answer and org.apache.cloudstack.agent.directdownload.DirectDownloadAnswer are in unnamed module of loader 'app')

[slavkap]

Hi @tampler, from what I see in the log the VM is not created because the template couldn't be created on the primary storage with direct download

2024-10-05 20:43:17,524 DEBUG [c.c.a.m.ClusteredAgentManagerImpl] (Work-Job-Executor-10:[ctx-2d567a50, job-41/job-42, ctx-f880dc5b]) (logid:d5e2ac24) Details from executing class org.apache.cloudstack.agent.directdownload.HttpsDirectDownloadCommand: java.lang.NullPointerException: Cannot invoke "com.cloud.hypervisor.kvm.storage.KVMPhysicalDisk.getSize()" because "template" is null at com.cloud.hypervisor.kvm.storage.KVMStorageProcessor.handleDownloadTemplateToPrimaryStorage(KVMStorageProcessor.java:2462)

I think Linstor doesn't support this feature from what I saw in the code

[tampler]

@slavkap One of the things that concern me is the status of SSVM. I highlighted "Agent State = Off" on the picture above, which indicates invalid SSVM state.

For me, using "Direct Download" feature is a workaround for invalid SSVM setup 😏 , which is another issue and is covered in #9746. I used to use Primary NFS and that option worked well for me ☝️

Now I'd love to switch to the Linstor Primary and this feature won't work. @rp - let me know if you need more info about Linstor setup or related info 🙏

[slavkap]

@tampler, I'm sorry I didn't discuss the SSVM issue because I think it was unrelated to the direct download case.

[rp-]

Yeah, this isn't implemented yet.
I think I got the Linstor part, but it needs some addition support code for CDROM BLOCK devices in CloudStack.