etcd-cluster.yaml

apiVersion: "etcd.database.coreos.com/v1beta2"
kind: "EtcdCluster"
metadata:
  name: "trillian-etcd-cluster"
  annotations:
    etcd.database.coreos.com/scope: clusterwide
spec:
  size: 5
  version: "3.2.13"
  pod:
    annotations:
      # Do not inject an Istio sidecar, because Etcd nodes require a network
      # connection on startup and don't retry on failure. This is a problem for
      # Istio because it takes a moment to start its proxy sidecar and, during
      # that time, all network connections will be blocked.
      sidecar.istio.io/inject: "false"
    affinity:
      podAntiAffinity:
        requiredDuringSchedulingIgnoredDuringExecution:
        - podAffinityTerm:
            labelSelector:
              matchExpressions:
              - key: etcd_cluster
                operator: In
                values:
                - trillian-etcd-cluster
          topologyKey: kubernetes.io/hostname