Camunda Modeler cannot connect to Zeebe Cluster

BPMN & Modeling Discussion & Questions
1

Hi,

I have enabled TLS for Zeebe gateway and Zeebe broker, but the issue is I cannot connect to the Zeebe cluster through the desktop modeler.

I use kubectl port-forward command forwarded the zeebe gateway port to local. The spring-boot application could successfully connect to zeebe cluster to get the topology and deploy bpmn processes with the same trust cert but the camunda modeler cannot.

image
image1002×856 60 KB

I have added the TLS flag for Camunda modeler:

image
image612×1244 69.3 KB

flags.json:

{
  "zeebe-ssl-certificate": "~/Desktop/Camunda/API Investigations/JAVA APPS/demo-process/src/main/resources/certs/grpc-gateway-chain.pem"
}

I’m using the Camunda 8 Self-Managed version (8.1.4) and deployed on k8s environment.

Have anyone met this issue? Thanks.

2

Not that this is the likely cause, but have you tried using

https://localhost:26500

rather than what’s configured in your screenshot (http://localhost:26500 )

the S in there instructs the software to wrap/unwrap the communications with TLS, so if you have one side configured to use TLS and tell the other side not to use TLS, they won’t be able to talk.

3

Hi @GotnOGuts ,

Thanks for your reply.

I have tried both HTTP and HTTPS, none of them work and the same error prompts.

I want to check the modeler logs, but not knowing where to find it.

4

Hi,

application log can be found on Mac in ~/Library/Logs/Camunda Modeler/log.log. You can run the following command to quickly copy it: cat ~/Library/Logs/Camunda\ Modeler/log.log | pbcopy.

5

Thanks, I got the log details.

  • First of all, I used the ’ ~/Desktop/… ’ as the cert path, which seems not permitted here. Modeler will find the cert file at ’ /~/Desktop/… ’ which is obviously not a valid path.
  • Secondly, I changed the cert path to an absolute path, but it is still not working and the error message shows as below:
2023-02-15T11:05:20.002Z  ERROR app:zeebe-api Failed to connect with config (secrets omitted): { endpoint: { type: 'selfHosted', url: 'https://localhost:26500' } } Error: 14 UNAVAILABLE: No connection established
    at Object.callErrorFromStatus (/Applications/Camunda Modeler.app/Contents/Resources/app.asar/node_modules/@grpc/grpc-js/build/src/call.js:31:19)
    at Object.onReceiveStatus (/Applications/Camunda Modeler.app/Contents/Resources/app.asar/node_modules/@grpc/grpc-js/build/src/client.js:195:52)
    at /Applications/Camunda Modeler.app/Contents/Resources/app.asar/node_modules/@grpc/grpc-js/build/src/call-stream.js:111:35
    at Object.onReceiveStatus (/Applications/Camunda Modeler.app/Contents/Resources/app.asar/node_modules/zeebe-node/dist/lib/GrpcClient.js:135:36)
    at InterceptingListenerImpl.onReceiveStatus (/Applications/Camunda Modeler.app/Contents/Resources/app.asar/node_modules/@grpc/grpc-js/build/src/call-stream.js:106:23)
    at Object.onReceiveStatus (/Applications/Camunda Modeler.app/Contents/Resources/app.asar/node_modules/@grpc/grpc-js/build/src/client-interceptors.js:365:141)
    at Object.onReceiveStatus (/Applications/Camunda Modeler.app/Contents/Resources/app.asar/node_modules/@grpc/grpc-js/build/src/client-interceptors.js:328:181)
    at /Applications/Camunda Modeler.app/Contents/Resources/app.asar/node_modules/@grpc/grpc-js/build/src/call-stream.js:188:78
    at process.processTicksAndRejections (node:internal/process/task_queues:78:11)
for call at
    at ServiceClientImpl.makeUnaryRequest (/Applications/Camunda Modeler.app/Contents/Resources/app.asar/node_modules/@grpc/grpc-js/build/src/client.js:163:34)
    at ServiceClientImpl.<anonymous> (/Applications/Camunda Modeler.app/Contents/Resources/app.asar/node_modules/@grpc/grpc-js/build/src/make-client.js:105:19)
    at /Applications/Camunda Modeler.app/Contents/Resources/app.asar/node_modules/zeebe-node/dist/lib/GrpcClient.js:305:47 {
  code: 14,
  details: 'No connection established',
  metadata: Metadata { internalRepr: Map(0) {}, options: {} }
}

I’m not sure if it is because I used kubectl port-forward command to map the zeebe gateway to local that the modeler cannot establish the TLS connection?

6