docs: add example Dockerfile

README.md

@@ -57,9 +57,11 @@ For more information about OpenVPN status file and version, see their [man page]
 
 If the information exposed is important to you serve it via the VPN or use a webserver as a proxy to handle SSL and/or HTTP authentication.
 
-### Init scripts
+### Startup
 
-The [Debian 6 init.d script](init.d/debian-6-openvpn-status-web) assumes that openvpn-status-web is installed into the system ruby (no RVM support) and the config.yaml is at `/opt/openvpn-status-web/config.yaml`. Modify to your needs.
+There is a [Dockerfile](docs/Dockerfile) that can be used to build a Docker image for running openvpn-status-web.
+
+The [Debian 6 init script](docs/debian-init-openvpn-status-web) assumes that openvpn-status-web is installed into the system ruby (no RVM support) and the config.yaml is at `/opt/openvpn-status-web/config.yaml`. Modify to your needs.
 
 ## License
 

docs/Dockerfile

@@ -0,0 +1,15 @@
+FROM alpine:3.12
+
+EXPOSE 8080
+
+ENV VERSION=2.1.0
+
+RUN apk --no-cache add openssl ca-certificates && \
+    apk --no-cache add ruby ruby-etc ruby-webrick && \
+    apk --no-cache add --virtual .build-deps ruby-dev build-base tzdata && \
+    gem install --no-document openvpn-status-web -v ${VERSION} && \
+    # set timezone to Berlin
+    cp /usr/share/zoneinfo/Europe/Berlin /etc/localtime && \
+    apk del .build-deps
+
+ENTRYPOINT ["openvpn-status-web", "/etc/openvpn-status-web/config.yml"]