add Dockerfile

Dockerfile

@@ -0,0 +1,23 @@
+FROM alpine:latest as build
+
+ADD . /sslh
+
+RUN \
+  apk add \
+    gcc \
+    libconfig-dev \
+    make \
+    musl-dev \
+    pcre-dev \
+    perl && \
+  cd /sslh && \
+  make sslh-select && \
+  strip sslh-select
+
+FROM alpine:latest
+
+COPY --from=build /sslh/sslh-select /sslh
+
+RUN apk --no-cache add libconfig pcre
+
+ENTRYPOINT [ "/sslh", "--foreground"]

Makefile

@@ -97,6 +97,15 @@ $(MAN): sslh.pod Makefile
 release:
 	git archive master --prefix="sslh-$(VERSION)/" | gzip > /tmp/sslh-$(VERSION).tar.gz
 
+# Build docker image
+docker:
+	docker image build -t "sslh:${VERSION}" .
+	docker image tag "sslh:${VERSION}" sslh:latest
+
+docker-clean:
+	yes | docker image rm "sslh:${VERSION}" sslh:latest
+	yes | docker image prune
+
 # generic install: install binary and man page
 install: sslh $(MAN)
 	mkdir -p $(DESTDIR)/$(BINDIR)

README.md

@@ -450,6 +450,54 @@ many connections to ssh from the same IP address...)
 
 See example files in scripts/fail2ban.
 
+Docker image
+------------
+
+How to use
+
+---
+
+Build docker image
+
+    make docker
+
+
+```bash
+docker container run \
+  --rm \
+  -it \
+  --listen=0.0.0.0:443 \
+  --ssh=hostname:22 \
+  --tlshostname:443 \
+  sslh:latest
+```
+
+docker-compose example
+
+```
+---
+version: "3"
+
+services:
+  sslh:
+    image: sslh:latest
+    hostname: sslh
+    ports:
+      - 443:443/tcp
+    command: --listen=0.0.0.0:443 --tlshostname:443 --openvpn=openvpn:1194
+    depends_on:
+      - nginx
+      - openvpn
+
+  nginx:
+    image: nginx
+    hostname: nginx
+
+  openvpn:
+    image: openvpn:latest
+    hostname: openvpn
+```
+
 Comments? Questions?
 ====================