diff --git a/services/logging/kustomization.yaml b/services/logging/kustomization.yaml
index dc487155..5a4c8334 100644
--- a/services/logging/kustomization.yaml
+++ b/services/logging/kustomization.yaml
@@ -18,6 +18,7 @@ resources:
   - oneoffs/opensearch-ism-job.yaml
   - oneoffs/opensearch-dashboards-setup-job.yaml
   - oneoffs/opensearch-observability-setup-job.yaml
+  - opensearch-single-node-tune-cronjob.yaml
   - opensearch-prune-cronjob.yaml
   - fluent-bit-helmrelease.yaml
   - node-log-rotation-daemonset.yaml
@@ -52,6 +53,12 @@ configMapGenerator:
       - prune.py=scripts/opensearch_prune.py
     options:
       disableNameSuffixHash: true
+  - name: opensearch-single-node-tune-script
+    namespace: logging
+    files:
+      - tune.py=scripts/opensearch_single_node_tune.py
+    options:
+      disableNameSuffixHash: true
   - name: opensearch-observability-script
     namespace: logging
     files:
diff --git a/services/logging/opensearch-single-node-tune-cronjob.yaml b/services/logging/opensearch-single-node-tune-cronjob.yaml
new file mode 100644
index 00000000..fe9ba712
--- /dev/null
+++ b/services/logging/opensearch-single-node-tune-cronjob.yaml
@@ -0,0 +1,50 @@
+# services/logging/opensearch-single-node-tune-cronjob.yaml
+apiVersion: batch/v1
+kind: CronJob
+metadata:
+  name: opensearch-single-node-tune
+  namespace: logging
+spec:
+  schedule: "*/30 * * * *"
+  concurrencyPolicy: Forbid
+  successfulJobsHistoryLimit: 1
+  failedJobsHistoryLimit: 3
+  jobTemplate:
+    spec:
+      backoffLimit: 2
+      template:
+        spec:
+          restartPolicy: OnFailure
+          nodeSelector:
+            node-role.kubernetes.io/worker: "true"
+            hardware: rpi5
+          affinity:
+            nodeAffinity:
+              requiredDuringSchedulingIgnoredDuringExecution:
+                nodeSelectorTerms:
+                  - matchExpressions:
+                      - key: hardware
+                        operator: In
+                        values:
+                          - rpi5
+          containers:
+            - name: tune
+              image: python:3.11-alpine
+              command: ["python", "/scripts/tune.py"]
+              env:
+                - name: OPENSEARCH_URL
+                  value: http://opensearch-master.logging.svc.cluster.local:9200
+              resources:
+                requests:
+                  cpu: 10m
+                  memory: 32Mi
+                limits:
+                  cpu: 200m
+                  memory: 128Mi
+              volumeMounts:
+                - name: scripts
+                  mountPath: /scripts
+          volumes:
+            - name: scripts
+              configMap:
+                name: opensearch-single-node-tune-script
diff --git a/services/logging/scripts/opensearch_single_node_tune.py b/services/logging/scripts/opensearch_single_node_tune.py
new file mode 100644
index 00000000..f12a6527
--- /dev/null
+++ b/services/logging/scripts/opensearch_single_node_tune.py
@@ -0,0 +1,111 @@
+import json
+import os
+import time
+import urllib.error
+import urllib.request
+
+OS_URL = os.environ.get("OPENSEARCH_URL", "http://opensearch-master.logging.svc.cluster.local:9200").rstrip("/")
+
+
+def request_json(path, method="GET", payload=None):
+    data = None
+    headers = {}
+    if payload is not None:
+        data = json.dumps(payload).encode("utf-8")
+        headers["Content-Type"] = "application/json"
+    request = urllib.request.Request(f"{OS_URL}{path}", data=data, headers=headers, method=method)
+    with urllib.request.urlopen(request, timeout=30) as response:
+        body = response.read().decode("utf-8")
+    return json.loads(body) if body else {}
+
+
+def wait_for_opensearch():
+    for _ in range(60):
+        try:
+            request_json("/")
+            return
+        except urllib.error.URLError:
+            time.sleep(5)
+    raise RuntimeError("OpenSearch did not become reachable")
+
+
+def put(path, payload):
+    response = request_json(path, method="PUT", payload=payload)
+    if not response.get("acknowledged", True):
+        raise RuntimeError(f"OpenSearch did not acknowledge {path}: {response}")
+
+
+def ensure_policy(policy_id, description, min_index_age):
+    payload = {
+        "policy": {
+            "description": description,
+            "schema_version": 1,
+            "default_state": "hot",
+            "states": [
+                {
+                    "name": "hot",
+                    "actions": [],
+                    "transitions": [
+                        {
+                            "state_name": "delete",
+                            "conditions": {"min_index_age": min_index_age},
+                        }
+                    ],
+                },
+                {
+                    "name": "delete",
+                    "actions": [{"delete": {}}],
+                    "transitions": [],
+                },
+            ],
+        }
+    }
+    put(f"/_plugins/_ism/policies/{policy_id}", payload)
+
+
+def ensure_template(name, patterns, priority, policy_id=None):
+    settings = {
+        "index": {
+            "number_of_shards": 1,
+            "number_of_replicas": 0,
+            "refresh_interval": "30s",
+        }
+    }
+    if policy_id:
+        settings["index"]["plugins"] = {
+            "index_state_management": {
+                "policy_id": policy_id,
+            }
+        }
+    payload = {
+        "index_patterns": patterns,
+        "priority": priority,
+        "template": {
+            "settings": settings,
+        },
+    }
+    put(f"/_index_template/{name}", payload)
+
+
+def ensure_single_node_replicas():
+    # A one-node OpenSearch cluster cannot allocate replicas; leaving them at 1
+    # makes the cluster permanently yellow and keeps Data Prepper waiting.
+    put("/*/_settings?expand_wildcards=all", {"index": {"number_of_replicas": 0}})
+
+
+def main():
+    wait_for_opensearch()
+    ensure_policy("logging-180d", "Delete logs after 180 days", "180d")
+    ensure_policy("trace-analytics-30d", "Delete trace analytics after 30 days", "30d")
+    ensure_template("kube-logs", ["kube-*"], 200, "logging-180d")
+    ensure_template("journald-logs", ["journald-*"], 200, "logging-180d")
+    ensure_template("trace-analytics", ["trace-analytics-*"], 200, "trace-analytics-30d")
+    ensure_template("otel-v1-apm-span-index-template", ["otel-v1-apm-span-*"], 250, "trace-analytics-30d")
+    ensure_template("otel-v1-apm-service-map-index-template", ["otel-v1-apm-service-map"], 250, "trace-analytics-30d")
+    ensure_template("opendistro-ism-history", [".opendistro-ism-*"], 250)
+    ensure_single_node_replicas()
+    print("opensearch_single_node_tune_ok")
+
+
+if __name__ == "__main__":
+    main()