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Workloads

Operator Builder uses WorkloadConfig manifests to define "workloads." A workload represents any group of Kubernetes resources. For example, a workload could be an application with Deployment, Service and Ingress resources. A workload may also be a group of resources that provide a platform service. They can be any group of resources that logically group together. Here's an example of a simple WorkloadConfig for a hypothetical web application called "webapp":

name: webapp
kind: StandaloneWorkload
spec:
  api:
    domain: apps.acme.com
    group: product
    version: v1alpha1
    kind: WebApp
    clusterScoped: false
  companionCliRootcmd:
    name: webappctl
    description: Manage webapp stuff like a boss
  resources:
    - deploy.yaml
    - service.yaml
    - ingress.yaml

This tells Operator Builder to create the source code for a new Kubernetes API called "WebApp." This is the API kind. The resources that comprise this webapp are a deployment, service and ingress. Those resources are defined in the source manifest files referenced under resources. Operator Builder uses those source manifests to generate source code for those resources. Those source manifests can contain markers to help define the API.

With the source code generated, the companion CLI can be built for end users. The controller container image can also be built and made available to end users.

End users then use the CLI install command to deploy the operator and then use the init command to generate a sample custom resource that might look something like this:

apiVersion: product.apps.acme.com/v1alpha1
kind: WebApp
metadata:
  name: dev-webapp
spec:
  production: false
  webAppReplicas: 2
  webAppImage: acmerepo/webapp:3.5.3

Required Fields

The following are required fields:

  • spec.api.domain # required for 'operator-builder init'
  • spec.api.group # required for 'operator-builder create api'
  • spec.api.version # required for 'operator-builder create api'
  • spec.api.kind # required for 'operator-builder create api'

All other fields are optional. The default value for clusterScoped if not defined is false. Alternatively, the above fields can be defined imperatively via the domain, group, version, and kind flags when running either operator-builder init or operater-builder create api (see above for correct context).

Resources

When specifying resource manifest files under spec.resources, in addition to providing specific filenames, you may use glob pattern matching to collect files. For example:

name: webapp
kind: StandaloneWorkload
spec:
  api:
    domain: apps.acme.com
    group: product
    version: v1alpha1
    kind: WebApp
    clusterScoped: false
  companionCliRootcmd:
    name: webappctl
    description: Manage webapp stuff like a boss
  resources:
    - rbac/*.yaml       # get all .yaml files in the rbac directory
    - workload/**.yaml  # get all .yaml files recursively in the workload
                        # directory and subdirectories therein

Collections

The spec.componentFiles field can only be defined in a WorkloadCollection. See workload collections for more information.