Dockerfile aktualisiert

Dockerfile

@@ -1,29 +1,30 @@
-FROM alpine:3.13 AS builder
+FROM alpine:latest
 
-RUN apk add --no-cache build-base
+RUN apk add --no-cache \
+    build-base \          # entspricht build-essential + gcc + make etc.
+    && rm -rf /var/cache/apk/*
 
-WORKDIR /app
-COPY . .
-RUN gcc -o deployment deployment.c
-
-FROM alpine:3.13
-
-RUN addgroup -g 1000 appgroup && \
-    adduser -D -u 1000 -G appgroup appuser
+RUN addgroup -S -g 10001 appgroup && \
+    adduser -S -u 10001 -G appgroup -h /app -s /bin/sh appuser
 
 WORKDIR /app
 
-COPY --from=builder /app/deployment /app/deployment
+COPY --chown=appuser:appgroup . .
 
-RUN mkdir /output && \
-    chown -R appuser:appgroup /app /output
+USER appuser
+RUN gcc -o deployment deployment.c -O2   # -O2 für etwas bessere Performance
+
+RUN mkdir -p /output && \
+    chown appuser:appgroup /output
+
+USER root
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=5s --retries=3 \
+    CMD pgrep deployment || exit 1
+
+VOLUME ["/output"]
 
 USER appuser
 
-VOLUME /output
-
-HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
-    CMD ps | grep -q '[d]eployment' || exit 1
-
 ENTRYPOINT ["/bin/sh", "-c"]
-CMD ["./deployment 10 > /output/output.txt && tail -f /output/output.txt"]
+CMD ["./deployment 10 > /output/output.txt 2>&1 && tail -f /output/output.txt"]