Write basic etcd-operator spec

[kvaps]

We agreed on the next spec:

---
apiVersion: etcd.aenix.io/v1alpha1
kind: EtcdCluster
metadata:
  name: test
  namespace: ns1
spec:
  replicas: 3
  storage:
    storageClass: local-path
    size: 10Gi
status:
  conditions:
  - lastProbeTime: null
     lastTransitionTime: "2024-03-06T18:39:39Z"
     status: "True"
     type: Initialized
  - lastProbeTime: null
     lastTransitionTime: "2024-03-06T18:39:45Z"
     status: "True"
     type: Ready
  - lastProbeTime: null
     lastTransitionTime: "2024-03-06T18:39:45Z"
     status: "True"
     type: Synchronized

[AlexGluck]

1. Before we implement PodTemplate, i suggest add opt-in image in spec
2. Solution for storage persistent: false use emptyDir, if not set default value true
3. Solution for storage value storageClass opt-in, if not set use default storage class

---
apiVersion: etcd.aenix.io/v1alpha1
kind: EtcdCluster
metadata:
  name: test
  namespace: ns1
spec:
  replicas: 3
  image: ""
  persistent: false
  storage:
    size: 10Gi
status:
  conditions:
  - lastProbeTime: null
     lastTransitionTime: "2024-03-06T18:39:39Z"
     status: "True"
     type: Initialized
  - lastProbeTime: null
     lastTransitionTime: "2024-03-06T18:39:45Z"
     status: "True"
     type: Ready
  - lastProbeTime: null
     lastTransitionTime: "2024-03-06T18:39:45Z"
     status: "True"
     type: Synchronized
...

[sedovandrew]

1. I would suggest specifying the Etc version of the cluster in the spec. By default, the operator will use the latest version of Etc known to him, for example, v3.5.12 at the moment. Also specify the version in status, so that the operator understands which cluster he is servicing.
2. I didn't see the field for the storage class.

I suggest adding the following fields:

spec:
  storage:
    class: storage-class-name  # optional #2
  version: v3.5.12  # optional #1
status:
  version: v3.5.12  # #1

Final manifest:

apiVersion: etcd.aenix.io/v1alpha1
kind: EtcdCluster
metadata:
  name: test
  namespace: ns1
spec:
  replicas: 3
  image: ""
  persistent: false
  storage:
    class: storage-class-name  # optional #2
    size: 10Gi
  version: v3.5.12  # optional #1
status:
  conditions:
  - lastProbeTime: null
     lastTransitionTime: "2024-03-06T18:39:39Z"
     status: "True"
     type: Initialized
  - lastProbeTime: null
     lastTransitionTime: "2024-03-06T18:39:45Z"
     status: "True"
     type: Ready
  - lastProbeTime: null
     lastTransitionTime: "2024-03-06T18:39:45Z"
     status: "True"
     type: Synchronized
  version: v3.5.12  # #1

It is also worth considering the list of Etcd versions supported by the operator.

[sircthulhu]

@AlexGluck thanks for your suggestions.
I think I will include them in my implementation.

Is there a reason for persistence field to be not in the .spec.storage but .spec?

[kvaps]

Fixed by #15 and #16

[AlexGluck]

Is there a reason for persistence field to be not in the .spec.storage but .spec?

Nope