simplistic Makefile

Dockerfile

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+FROM python:3.10-slim
+
+WORKDIR /root
+COPY setup.py fail2ban config bin ./
+RUN python setup.py install
+
+ENTRYPOINT ["/bin/fail2ban-server"]

Makefile

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+setup:
+	docker-compose -f docker-compose.yml up --build -d
+clean:
+	docker-compose down
+	docker image rm fail2ban

docker-compose.yml

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+version: "3.9"
+services:
+  fail2ban:
+    image: fail2ban
+    restart: unless-stopped
+    build:
+      context: .
+      dockerfile: ./Dockerfile
+    volumes:
+      - /var/run/fail2ban/fail2ban.sock # use fail2ban-client outside the container
+      - /var/log/auth.log:/var/log/auth.log
+      - ./config:/etc/fail2ban/config
+    stdin_open: true
+    tty: true