initial commit

Makefile

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+# .PHONY:
+# build
+
+build:
+	docker buildx build --platform=linux/amd64,linux/arm64 -t code.whiteblossom.xyz/infra/node-external-ip-controller:latest --push -f node-external-ip-controller.Dockerfile .
+
+push:
+	docker push code.whiteblossom.xyz/infra/node-external-ip-controller:latest
+
+builder:
+	docker buildx create \
+  --name container-builder \
+  --driver docker-container \
+  --bootstrap --use
+

node-external-ip-controller.Dockerfile

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+# Use Python base image
+FROM python:3.13-alpine3.19
+
+# Install the Kubernetes Python client
+RUN pip install kubernetes
+
+# Copy the controller script into the container
+COPY node_external_ip_controller.py /app/node_external_ip_controller.py
+
+# Set the working directory
+WORKDIR /app
+
+# Set the command to run the controller script
+CMD ["python", "node_external_ip_controller.py"]

node_external_ip_controller.py

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+from kubernetes import client, config, watch
+import os
+
+# Load in-cluster config
+config.load_incluster_config()
+
+# Set up Kubernetes API client
+v1 = client.CoreV1Api()
+
+# Configuration
+SERVICE_NAME = "YOUR_SERVICE_NAME"
+NAMESPACE = "YOUR_NAMESPACE"
+
+
+def update_service_annotation(external_ip):
+    # Get the current service object
+    service = v1.read_namespaced_service(SERVICE_NAME, NAMESPACE)
+
+    # Check if the annotation needs to be updated
+    current_annotation = service.metadata.annotations.get("external-ip")
+    if current_annotation != external_ip:
+        # Update the annotation
+        body = {"metadata": {"annotations": {"external-ip": external_ip}}}
+        v1.patch_namespaced_service(SERVICE_NAME, NAMESPACE, body)
+        print(f"Updated service {SERVICE_NAME} with new external IP: {external_ip}")
+
+
+def main():
+    w = watch.Watch()
+    for event in w.stream(v1.list_node, _request_timeout=60):
+        node = event["object"]
+        node_name = node.metadata.name
+
+        # Extract the external IP if it exists
+        external_ip = None
+        for address in node.status.addresses:
+            if address.type == "ExternalIP":
+                external_ip = address.address
+                break
+
+        if external_ip:
+            print(f"Detected external IP {external_ip} for node {node_name}")
+            update_service_annotation(external_ip)
+
+
+if __name__ == "__main__":
+    main()