Version: v1.0

Manual Scaling

The scaler trait allows you to scale your component instance manually.

  1. $ kubectl vela show scaler 
  2. # Properties
  3. +----------+--------------------------------+------+----------+---------+
  4. |   NAME   |          DESCRIPTION           | TYPE | REQUIRED | DEFAULT |
  5. +----------+--------------------------------+------+----------+---------+
  6. | replicas | Specify replicas of workload   | int  | true     |       1 |
  7. +----------+--------------------------------+------+----------+---------+

Declare an application with scaler trait.

  1. # sample-manual.yaml
  2. apiVersion: core.oam.dev/v1beta1
  3. kind: Application
  4. metadata:
  5.   name: website
  6. spec:
  7.   components:
  8.     - name: frontend
  9.       type: webservice
  10.       properties:
  11.         image: nginx
  12.       traits:
  13.         - type: scaler
  14.           properties:
  15.             replicas: 2
  16.         - type: sidecar
  17.           properties:
  18.             name: "sidecar-test"
  19.             image: "fluentd"
  20.     - name: backend
  21.       type: worker
  22.       properties:
  23.         image: busybox
  24.         cmd:
  25.           - sleep
  26.           - '1000'

Apply the sample application:

  1. $ kubectl apply -f https://raw.githubusercontent.com/oam-dev/kubevela/master/docs/examples/enduser/sample-manual.yaml
  2. application.core.oam.dev/website configured

In runtime cluster, you can see the underlying deployment of frontend component has 2 replicas now.

  1. $ kubectl get deploy -l app.oam.dev/name=website
  2. NAME       READY   UP-TO-DATE   AVAILABLE   AGE
  3. backend    1/1     1            1           19h
  4. frontend   2/2     2            2           19h

To scale up or scale down, you just need to modify the replicas field of scaler trait and re-apply the YAML.