What is Kubernetes Endpoint Conditions?

Question

Accepted Answer

**Endpoint Conditions** — detailed status of each endpoint.

```yaml
apiVersion: discovery.k8s.io/v1
kind: EndpointSlice
metadata:
  name: myapp-abc12
  namespace: production
  labels:
    kubernetes.io/service-name: myapp
addressType: IPv4
ports:
- name: http
  port: 80
  protocol: TCP
endpoints:
- addresses:
  - "10.0.1.5"
  conditions:
    ready: true
    serving: true
    terminating: false
  nodeName: node-1
  zone: us-west-2a
  deprecatedTopology:
    topology.kubernetes.io/zone: us-west-2a
  hints:
    forZones:
    - name: us-west-2a
- addresses:
  - "10.0.2.8"
  conditions:
    ready: false
    serving: false
    terminating: true
  nodeName: node-2
  zone: us-west-2b
  conditions:
    ready: true
    serving: true
    terminating: false
```

```bash
# Check endpoint conditions
kubectl get endpointslice myapp-abc12 -o yaml | grep -A 20 endpoints

# Check service readiness
kubectl get endpoints myapp -o jsonpath='{.subsets[*].conditions[*]}' | jq

# Verify endpoint health
kubectl get endpoints myapp -o wide

# Check terminating endpoints
kubectl get endpointslice -l kubernetes.io/service-name=myapp -o yaml | grep terminating

# Verify traffic routing
kubectl exec -it my-pod -- curl http://myapp.production.svc.cluster.local
```

**Conditions:**
- ready: endpoint is ready to receive traffic.
- serving: endpoint is serving (regardless of readiness gate).
- terminating: endpoint is being shut down.

**Behavior:**
- Ready=false: removed from Service endpoints.
- Terminating=true: will be removed soon.
- Serving=false: not serving requests.

DevOps: What is Kubernetes Endpoint Conditions?