[recommendation]: switch from distroless to alpine image (open-telemetry#2164)

Signed-off-by: Gerard Vanloo <gerard.vanloo@ibm.com>

Author: Red-GV

CHANGELOG.md

@@ -21,6 +21,8 @@ the release.
   ([#2161](https://github.com/open-telemetry/opentelemetry-demo/pull/2161))
 * [chore] bump dependent images
   ([#2179](https://github.com/open-telemetry/opentelemetry-demo/pull/2179))
+* [recommendation] change image from bookworm to alpine to reduce size
+  ([#2164](https://github.com/open-telemetry/opentelemetry-demo/pull/2164))
 
 ## 2.0.2
 

src/recommendation/Dockerfile

@@ -2,31 +2,29 @@
 # SPDX-License-Identifier: Apache-2.0
 
 
-FROM python:3.12-slim-bookworm AS base
+FROM python:3.12-alpine3.21 AS build-venv
 
-#
-# Fetch requirements
-#
-FROM base AS builder
-RUN apt-get -qq update \
-    && apt-get install -y --no-install-recommends g++ \
-    && rm -rf /var/lib/apt/lists/*
+RUN apk update && \
+    apk add gcc g++ linux-headers
 
-WORKDIR /usr/src/app/
-COPY ./src/recommendation/requirements.txt ./
+COPY ./src/recommendation/requirements.txt requirements.txt
 
-RUN pip install --upgrade pip
-RUN pip install --prefix="/reqs" -r requirements.txt
+RUN python -m venv venv && \
+    venv/bin/pip install --no-cache-dir -r requirements.txt
 
-#
-# Runtime
-#
-FROM base AS runtime
-WORKDIR /usr/src/app/
-COPY --from=builder /reqs /usr/local
-COPY ./src/recommendation/ ./
+RUN venv/bin/opentelemetry-bootstrap -a install
 
-RUN opentelemetry-bootstrap -a install
+FROM python:3.12-alpine3.21
+
+COPY --from=build-venv /venv/ /venv/
+
+WORKDIR /app
+
+COPY ./src/recommendation/demo_pb2_grpc.py demo_pb2_grpc.py
+COPY ./src/recommendation/demo_pb2.py demo_pb2.py
+COPY ./src/recommendation/logger.py logger.py
+COPY ./src/recommendation/metrics.py metrics.py
+COPY ./src/recommendation/recommendation_server.py recommendation_server.py
 
 EXPOSE ${RECOMMENDATION_PORT}
-ENTRYPOINT [ "opentelemetry-instrument", "python", "recommendation_server.py" ]
+ENTRYPOINT [ "/venv/bin/opentelemetry-instrument", "/venv/bin/python", "recommendation_server.py" ]

src/recommendation/requirements.txt

@@ -1,5 +1,5 @@
-grpcio-health-checking==1.70.0
-grpcio==1.70.0
+grpcio-health-checking==1.71.0
+grpcio==1.71.0
 opentelemetry-distro==0.51b0
 opentelemetry-exporter-otlp-proto-grpc==1.30.0
 python-dotenv==1.0.1