Configure Resource Specification

You can manage container-level resource specification in the AppConfiguration model via the resources field (under the Container schema).

For the full Container schema reference, please see here for more details.

Prerequisites

Please refer to the prerequisites in the guide for deploying an application.

The example below also requires you to have initialized the project using the kusion workspace create and kusion init command, which will create a workspace and also generate a kcl.mod file under the stack directory.

Managing Workspace Configuration

In the first guide in this series, we introduced a step to initialize a workspace with an empty configuration. The same empty configuration will still work in this guide, no changes are required there.

Example

Update the resources value in simple-service/dev/main.k:

import kam.v1.app_configuration as ac

helloworld: ac.AppConfiguration {
    workload.containers.helloworld: {
        ...
        # before:
        # resources: {
        #     "cpu": "500m"
        #     "memory": "512M"
        # }
        # after: 
        resources: {
            "cpu": "250m"
            "memory": "256Mi"
        }
        ...
    }
}

Everything else in main.k stay the same.

Applying

Re-run steps in Applying, resource scaling is completed.

$ kusion apply
 ✔︎  Generating Spec in the Stack dev...                                                                                                                                                                                                     
Stack: dev  ID                                                               Action
* ├─     v1:Namespace:simple-service                                      UnChanged
* ├─     v1:Service:simple-service:simple-service-dev-helloworld-private  UnChanged
* └─     apps/v1:Deployment:simple-service:simple-service-dev-helloworld  Update


? Do you want to apply these diffs? yes
Start applying diffs ...
 SUCCESS  UnChanged v1:Namespace:simple-service, skip                                                                                                                                                                                         
 SUCCESS  UnChanged v1:Service:simple-service:simple-service-dev-helloworld-private, skip                                                                                                                                                     
 SUCCESS  Update apps/v1:Deployment:simple-service:simple-service-dev-helloworld success                                                                                                                                                      
Update apps/v1:Deployment:simple-service:simple-service-dev-helloworld success [3/3] ███████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████ 100% | 0s
Apply complete! Resources: 0 created, 1 updated, 0 deleted.

Validation

We can verify the application container (in the deployment template) now has the updated resources attributes (cpu:250m, memory:256Mi) as defined in the container configuration:

kubectl get deployment -n simple-service -o yaml
...
    template:
      ...
      spec:
        containers:
        - env:
          ...
          image: gcr.io/google-samples/gb-frontend:v5
          ...
          resources:
            limits:
              cpu: 250m
              memory: 256Mi
...