Deploy First Application

Before starting, please confirm that you’ve installed KubeVela and enabled the VelaUX addon according to the installation guide.

Welcome to KubeVela! This section will guide you to deliver your first app.

Below is a classic KubeVela application which contains one component with one operational trait, basically, it means to deploy a container image as webservice with one replica. Additionally, there are three policies and workflow steps, it means to deploy the application into two different environments with a bit different configurations.

apiVersion: core.oam.dev/v1beta1
kind: Application
metadata:
  name: first-vela-app
spec:
  components:
    - name: express-server
      type: webservice
      properties:
        image: oamdev/hello-world
        ports:
         - port: 8000
           expose: true
      traits:
        - type: scaler
          properties:
            replicas: 1
  policies:
    - name: target-default
      type: topology
      properties:
        # The cluster with name local is installed the KubeVela.
        clusters: ["local"]
        namespace: "default"
    - name: target-prod
      type: topology
      properties:
        clusters: ["local"]
        # This namespace must be created before deploying.
        namespace: "prod"
    - name: deploy-ha
      type: override
      properties:
        components:
          - type: webservice
            traits:
              - type: scaler
                properties:
                  replicas: 2
  workflow:
    steps:
      - name: deploy2default
        type: deploy
        properties:
          policies: ["target-default"]
      - name: manual-approval
        type: suspend
      - name: deploy2prod
        type: deploy
        properties:
          policies: ["target-prod", "deploy-ha"]

Create an environment for your first app.

# This command will create a namespace in the local cluster
$ vela env init prod --namespace prod
environment prod with namespace prod created

Starting deploy the application

$ vela up -f https://kubevela.net/example/applications/first-app.yaml
Applying an application in vela K8s object format...
I0516 15:45:18.123356   27156 apply.go:107] "creating object" name="first-vela-app" resource="core.oam.dev/v1beta1, Kind=Application"
✅ App has been deployed 🚀🚀🚀
    Port forward: vela port-forward first-vela-app
             SSH: vela exec first-vela-app
         Logging: vela logs first-vela-app
      App status: vela status first-vela-app
        Endpoint: vela status first-vela-app --endpoint
Application prod/first-vela-app applied.

View the process and status of the application deploy

$ vela status first-vela-app
About:
  Name:         first-vela-app
  Namespace:    prod
  Created at:   2022-05-16 15:45:18 +0800 CST
  Status:       workflowSuspending
Workflow:
  ...
Services:
  - Name: express-server
    Cluster: local  Namespace: default
    Type: webservice
    Healthy Ready:1/1
    Traits:
      ✅ scaler

The application will become a workflowSuspending status, it means the workflow has finished the first two steps and waiting for manuel approval as the step specified.

Access the application

We can check the application by:

vela port-forward first-vela-app 8000:8000

It will invoke your browser and your can see the website:

<xmp>
Hello KubeVela! Make shipping applications more enjoyable. 
...snip...

Resume the workflow

After we finished check the application, we can approve the workflow to continue:

$ vela workflow resume first-vela-app
Successfully resume workflow: first-vela-app

Then the rest part will be delivered in prod namespace:

$ vela status first-vela-app
About:
  Name:         first-vela-app
  Namespace:    prod
  Created at:   2022-05-16 15:45:18 +0800 CST
  Status:       running
Workflow:
  ...snipt...
Services:
  - Name: express-server
    Cluster: local  Namespace: prod
    Type: webservice
    Healthy Ready:2/2
    Traits:
      ✅ scaler
  - Name: express-server
    Cluster: local  Namespace: default
    Type: webservice
    Healthy Ready:1/1
    Traits:
      ✅ scaler

Great! You have finished deploying your first KubeVela application, you can also view and manage it in UI.

Currently, the application created by CLI is readonly in your dashboard.

After finished the installation of VelaUX, you can view and manage the application created.

Port forward the UI if you don’t have endpoint for access:

vela port-forward addon-velaux -n vela-system 8080:80

Check the password by:

vela logs -n vela-system --name apiserver addon-velaux | grep "initialized admin username"

Check the resources deployed

Click the application card, then you can view the details of the application.

$ vela delete first-vela-app
Deleting Application "first-vela-app"
app "first-vela-app" deleted from namespace "prod"

That’s it! You succeed at the first application delivery. Congratulation!

View Core Concepts to learn more about how it works.
View User Guide to look on more of what you can achieve with KubeVela.

Last updated on Nov 1, 2022 by Tianxin Dong