helm: expose s3 update strategy, lifecycle, and termination grace period (#11602)

The standalone s3 Deployment hardcoded terminationGracePeriodSeconds and
offered no way to set a container lifecycle or the Deployment strategy, so
operators could not add a preStop delay to drain endpoints before SIGTERM
or hold maxUnavailable at 0 during rollouts.

Add s3.updateStrategy, s3.lifecycle and s3.terminationGracePeriodSeconds.
Defaults render the same manifest as before.

.github/workflows/helm_ci.yml

@@ -57,7 +57,25 @@ jobs:
           helm template test $CHART_DIR --set s3.enabled=true > /tmp/s3.yaml
           grep -q "kind: Deployment" /tmp/s3.yaml && grep -q "seaweedfs-s3" /tmp/s3.yaml
           echo "S3 deployment renders correctly"
-          
+
+          echo "=== Testing S3 rollout settings ==="
+          helm template test $CHART_DIR --show-only templates/s3/s3-deployment.yaml \
+            --set s3.enabled=true > /tmp/s3-rollout-defaults.yaml
+          grep -q "terminationGracePeriodSeconds: 10$" /tmp/s3-rollout-defaults.yaml
+          test "$(grep -cE '^  strategy:|^ +lifecycle:' /tmp/s3-rollout-defaults.yaml)" -eq 0
+          helm template test $CHART_DIR --show-only templates/s3/s3-deployment.yaml \
+            --set s3.enabled=true \
+            --set s3.terminationGracePeriodSeconds=30 \
+            --set s3.updateStrategy.type=RollingUpdate \
+            --set s3.updateStrategy.rollingUpdate.maxUnavailable=0 \
+            --set-string 's3.lifecycle.preStop.exec.command={sleep,5}' \
+            > /tmp/s3-rollout.yaml
+          grep -q "terminationGracePeriodSeconds: 30$" /tmp/s3-rollout.yaml
+          grep -A 4 "^  strategy:" /tmp/s3-rollout.yaml | grep -q "maxUnavailable: 0"
+          grep -A 4 "^  strategy:" /tmp/s3-rollout.yaml | grep -q "type: RollingUpdate"
+          grep -A 5 "^          lifecycle:" /tmp/s3-rollout.yaml | grep -q -- "- sleep"
+          echo "S3 rollout settings render correctly"
+
           echo "=== Testing S3 credentials from an existing secret ==="
           credential_args=(
             --set s3.credentials.admin.existingSecret=minio-root

k8s/charts/seaweedfs/templates/s3/s3-deployment.yaml

@@ -17,6 +17,10 @@ metadata:
 {{- end }}
 spec:
   replicas: {{ .Values.s3.replicas }}
+  {{- with .Values.s3.updateStrategy }}
+  strategy:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
   selector:
     matchLabels:
       app.kubernetes.io/name: {{ template "seaweedfs.name" . }}
@@ -59,7 +63,7 @@ spec:
         {{ tpl .Values.s3.tolerations . | nindent 8 | trim }}
       {{- end }}
       {{- include "seaweedfs.imagePullSecrets" . | nindent 6 }}
-      terminationGracePeriodSeconds: 10
+      terminationGracePeriodSeconds: {{ .Values.s3.terminationGracePeriodSeconds }}
       {{- if .Values.s3.priorityClassName }}
       priorityClassName: {{ .Values.s3.priorityClassName | quote }}
       {{- end }}
@@ -235,6 +239,10 @@ spec:
             failureThreshold: {{ .Values.s3.livenessProbe.failureThreshold }}
             timeoutSeconds: {{ .Values.s3.livenessProbe.timeoutSeconds }}
           {{- end }}
+          {{- with .Values.s3.lifecycle }}
+          lifecycle:
+            {{- toYaml . | nindent 12 }}
+          {{- end }}
           {{- with .Values.s3.resources }}
           resources:
             {{- toYaml . | nindent 12 }}

k8s/charts/seaweedfs/values.yaml

@@ -1035,6 +1035,17 @@ s3:
   imageOverride: null
   restartPolicy: null
   replicas: 1
+  # Deployment update strategy, rendered as the Deployment's strategy
+  # ref: https://kubernetes.io/docs/concepts/workloads/controllers/deployment/#strategy
+  # Example:
+  # updateStrategy:
+  #   type: RollingUpdate
+  #   rollingUpdate:
+  #     maxUnavailable: 0
+  #     maxSurge: 25%
+  updateStrategy: {}
+  # Time the s3 pod is given to shut down, including any preStop hook
+  terminationGracePeriodSeconds: 10
   bindAddress: 0.0.0.0
   port: 8333
   # add additional https port
@@ -1227,6 +1238,17 @@ s3:
     failureThreshold: 100
     timeoutSeconds: 10
 
+  # Lifecycle hooks for the s3 container. A preStop sleep lets the pod leave
+  # the Service endpoints before it receives SIGTERM; keep it shorter than
+  # terminationGracePeriodSeconds.
+  # ref: https://kubernetes.io/docs/concepts/containers/container-lifecycle-hooks/
+  # Example:
+  # lifecycle:
+  #   preStop:
+  #     exec:
+  #       command: ["sleep", "5"]
+  lifecycle: {}
+
   createBucketsHook:
     resources: {}