Debugging Application

KubeVela supports several CLI commands for debugging your applications, they can work on control plane and help you access resources across multi-clusters. Which also means you can play with your pods in managed clusters directly on the hub cluster, without switching KubeConfig context. If you have multiple clusters in on application, the CLI command will ask you to choose one interactively.

List all your applications.

  1. vela ls

expected output

``` APP COMPONENT TYPE TRAITS PHASE HEALTHY STATUS CREATED-TIME war war java-war running healthy Ready:1/1 2022-09-30 17:32:29 +0800 CST ck-instance ck-instance clickhouse running healthy 2022-09-30 17:38:13 +0800 CST kubecon-demo hello-world java-war gateway running healthy Ready:1/1 2022-10-08 11:32:47 +0800 CST ck-app my-ck clickhouse gateway running healthy Host not specified, visit the cluster or load balancer in 2022-10-08 17:55:20 +0800 CST front of the cluster with IP: 47.251.8.82 demo2 catalog java-war workflowSuspending healthy Ready:1/1 2022-10-08 16:22:11 +0800 CST ├─ customer java-war workflowSuspending healthy Ready:1/1 2022-10-08 16:22:11 +0800 CST └─ order-web java-war gateway workflowSuspending healthy Ready:1/1 2022-10-08 16:22:11 +0800 CST kubecon-demo2 hello-world2 java-war gateway workflowSuspending healthy Ready:1/1 2022-10-08 11:48:41 +0800 CST ```

  • vela status can give you an overview of your deployed multi-cluster application.
  1. vela up -f https://kubevela.net/example/applications/first-app.yaml
  2. vela status first-vela-app

expected output

  1. About:
  3.   Name:         first-vela-app
  4.   Namespace:    default
  5.   Created at:   2022-10-09 12:10:30 +0800 CST
  6.   Status:       workflowSuspending
  8. Workflow:
  10.   mode: StepByStep
  11.   finished: false
  12.   Suspend: true
  13.   Terminated: false
  14.   Steps
  15.   - id: g1jtl5unra
  16.     name: deploy2default
  17.     type: deploy
  18.     phase: succeeded
  19.     message:
  20.   - id: 6cq88ufzq5
  21.     name: manual-approval
  22.     type: suspend
  23.     phase: running
  24.     message:
  26. Services:
  28.   - Name: express-server
  29.     Cluster: local  Namespace: default
  30.     Type: webservice
  31.     Healthy Ready:1/1
  32.     Traits:
  33.       ✅ scaler
  • vela status --pod can list the pod status of your application.
  1. vela status first-vela-app --pod

expected output

  1. CLUSTER COMPONENT       POD NAME                        NAMESPACE   PHASE   CREATE TIME             REVISION    HOST
  2. local   express-server  express-server-b768d95b7-qnwb4  default     Running 2022-10-09T04:10:31Z                izrj9f9wodrsepwyb9mcetz
  • vela status --endpoint can list the access endpoints of your application.
  1. vela status first-vela-app --endpoint

expected output

  1. Please access first-vela-app from the following endpoints:
  2. +---------+----------------+--------------------------------+-----------------------------+-------+
  3. | CLUSTER |   COMPONENT    |    REF(KIND/NAMESPACE/NAME)    |          ENDPOINT           | INNER |
  4. +---------+----------------+--------------------------------+-----------------------------+-------+
  5. | local   | express-server | Service/default/express-server | express-server.default:8000 | true  |
  6. +---------+----------------+--------------------------------+-----------------------------+-------+
  • vela status --tree --detail can list resources of your application.
  1. vela status first-vela-app --tree --detail

expected output

  1. CLUSTER       NAMESPACE     RESOURCE                  STATUS    APPLY_TIME          DETAIL
  2. local     ─── default   ─┬─ Service/express-server    updated   2022-10-09 12:10:30 Type: ClusterIP  Cluster-IP: 10.43.212.235  External-IP: <none>  Port(s): 8000/TCP  Age: 6m44s
  3.                          └─ Deployment/express-server updated   2022-10-09 12:10:30 Ready: 1/1  Up-to-date: 1  Available: 1  Age: 6m44s
  • vela logs shows pod logs in managed clusters.
  1. vela logs first-vela-app

expected output

  1. + express-server-b768d95b7-qnwb4 › express-server
  2. express-server 2022-10-09T12:10:33.785549770+08:00 httpd started
  • vela exec helps you execute commands in pods in managed clusters.
  1. vela exec first-vela-app -it -- ls

expected output

  1. bin   dev   etc   home  proc  root  sys   tmp   usr   var   www
  • vela port-forward can discover and forward ports of pods or services in managed clusters to your local endpoint.
  1. vela port-forward first-vela-app 8001:8000

You can curl this app by curl http://127.0.0.1:8001/.

Please refer to the CLI docs.

Last updated on 2023年8月4日 by Daniel Higuero