FooOperator

This was an experimental Operator, and rewritten with a pattern outlined via an example project: https://github.com/openshift/gcp-project-operator

What It Does

Its designed to supply a dedicated Pod, Service (svc), and Ingress. Normally not something that is commonly done, but there are a couple use cases, like a headless browser, or needing to launch a bunch of game servers.

It does this through two CRDs. Foo and the FooBar. Foo, is the base level object, that owns the Pod, Service and Ingress. The FooBar, acts like a Deployment object, its role is to create a bunch of Foos.

In the grander scheme, an API server would be required to allocate these Foos out to the requesting parties.

Lets take a look at what the configurations look like

Configuring

---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: fooworker
  namespace: barx
automountServiceAccountToken: true
---
apiVersion: apps.undeadops.xyz/v1alpha1
kind: Foo
metadata:
  name: simplyfoo
  namespace: barx
  annotations:
    prometheus.io/scrap: "true"
    prometheus.io/port: "9797"
  labels:
    owner: "sre"
spec:
  pod:
    serviceAccountName: fooworker
    image: ghcr.io/stefanprodan/podinfo:6.1.6
    ports:
    - name: http
      containerPort: 9898
      protocol: TCP
    - name: http-metrics
      containerPort: 9797
      protocol: TCP
    - name: grpc
      containerPort: 9999
      protocol: TCP
    command:
    - ./podinfo
    - --port=9898
    - --port-metrics=9797
    - --grpc-port=9999
    - --grpc-service-name=podinfo
    - --level=info
    - --random-delay=false
    - --random-error=false
    env:
    - name: PODINFO_UI_COLOR
      value: "#34577c"
    resources:
      limits:
        cpu: 2000m
        memory: 512Mi
      requests:
        cpu: 100m
        memory: 64Mi
  ingress:
    servicePort: 9898
    ingressClassName: traefik

That is the equivalent of creating a "Pod" instead of a "Deployment". Overall, its designed to be very similar to a Normal Pod definition.

A FooBar Definition looks like the following:

apiVersion: apps.undeadops.xyz/v1alpha1
kind: FooBar
metadata:
  name: undead
  namespace: barx
  annotations:
    prometheus.io/scrap: "true"
    prometheus.io/port: "9797"
  labels:
    owner: "sre"
spec:
  replicas: 2
  foo:
    pod:
      image: ghcr.io/stefanprodan/podinfo:6.1.6
      ports:
        - name: http
          containerPort: 9898
          protocol: TCP
        - name: http-metrics
          containerPort: 9797
          protocol: TCP
        - name: grpc
          containerPort: 9999
          protocol: TCP
      command:
        - ./podinfo
        - --port=9898
        - --port-metrics=9797
        - --grpc-port=9999
        - --grpc-service-name=podinfo
        - --level=info
        - --random-delay=false
        - --random-error=false
      env:
        - name: PODINFO_UI_COLOR
          value: "#34577c"
      resources:
        limits:
          cpu: 2000m
          memory: 512Mi
        requests:
          cpu: 100m
          memory: 64Mi
    ingress:
      servicePort: 9898
      ingressClassName: traefik

From that, it should create 2 copies of the Foo resource.