Pass environment-specific configuration in score-humanitec

This section describes how to pass environment-specific configuration to the Workload during deployment.

2 minute read

Humanitec provides a dynamic application configuration mechanism through the Shared Application Values.

Overview

The Score Specification uses a special environment property type that is specified in the resources section.

apiVersion: score.sh/v1b1

metadata:
  name: hello-world

containers:
  hello:
    image: busybox
    command: ["/bin/sh"]
    args: ["-c", "while true; do echo Hello $${FRIEND}!; sleep 5; done"]
    variables:
      FRIEND: ${resources.env.NAME}

resources:
  env:
    type: environment
    properties:
      NAME:
        type: string
        default: World

Resources need to map to the resource structure. To declare environment variables in a Score file, the variable name, resources.env.NAME must map to the structure in resource section.

For more information, see the Resource section in the Score Specification reference.

Use the run command to generate a Humanitec deployment delta file from Score.

score-humanitec run -f ./score.yaml \
  --env test-env

The following is the output of the previous command.

{
  "metadata": {
    "env_id": "test-env",
    "name": "Auto-generated (SCORE)"
  },
  "modules": {
    "add": {
      "hello-world": {
        "profile": "humanitec/default-module",
        "spec": {
          "containers": {
            "hello": {
              "args": [
                "-c",
                "while true; do echo Hello $${FRIEND}!; sleep 5; done"
              ],
              "command": [
                "/bin/sh"
              ],
              "id": "hello",
              "image": "busybox",
              "variables": {
                "FRIEND": "${values.NAME}"
              }
            }
          }
        }
      }
    }
  }
}

The output JSON can be used as a payload to Create a new Delta with a Humanitec API call.

When deploying this service with Humanitec, make sure the shared application value called NAME is created and set for the target environment.