From a89a263250cead43cedb7b04ed73a05d52ade35e Mon Sep 17 00:00:00 2001
From: cn <cn@mycrobase.de>
Date: Thu, 30 Jul 2020 19:49:31 +0200
Subject: [PATCH] docs: add example Dockerfile

---
 README.md                                         |  6 ++++--
 docs/Dockerfile                                   | 15 +++++++++++++++
 .../debian-6-init-dyndnsd                         |  0
 3 files changed, 19 insertions(+), 2 deletions(-)
 create mode 100644 docs/Dockerfile
 rename init.d/debian-6-dyndnsd => docs/debian-6-init-dyndnsd (100%)
 mode change 100644 => 100755

diff --git a/README.md b/README.md
index 0c3ea77..856ad9d 100644
--- a/README.md
+++ b/README.md
@@ -187,9 +187,11 @@ If you want to provide an additional IPv6 address as myip6 parameter, the myip p
 Use a webserver as a proxy to handle SSL and/or multiple listen addresses and ports. DynDNS.com provides HTTP on port 80 and 8245 and HTTPS on port 443.
 
 
-### Init scripts
+### Startup
 
-The [Debian 6 init.d script](init.d/debian-6-dyndnsd) assumes that dyndnsd.rb is installed into the system ruby (no RVM support) and the config.yaml is at /opt/dyndnsd/config.yaml. Modify to your needs.
+There is a [Dockerfile](docs/Dockerfile) that can be used to build a Docker image for running dyndnsd.rb.
+
+The [Debian 6 init.d script](docs/debian-6-init-dyndnsd) assumes that dyndnsd.rb is installed into the system ruby (no RVM support) and the config.yaml is at /opt/dyndnsd/config.yaml. Modify to your needs.
 
 
 ### Monitoring
diff --git a/docs/Dockerfile b/docs/Dockerfile
new file mode 100644
index 0000000..c138b7d
--- /dev/null
+++ b/docs/Dockerfile
@@ -0,0 +1,15 @@
+FROM alpine:3.12
+
+EXPOSE 5353 8080
+
+ENV VERSION=3.0.0
+
+RUN apk --no-cache add openssl ca-certificates && \
+    apk --no-cache add ruby ruby-etc ruby-io-console ruby-json ruby-webrick && \
+    apk --no-cache add --virtual .build-deps ruby-dev build-base tzdata && \
+    gem install --no-document dyndnsd -v ${VERSION} && \
+    # set timezone to Berlin
+    cp /usr/share/zoneinfo/Europe/Berlin /etc/localtime && \
+    apk del .build-deps
+
+ENTRYPOINT ["dyndnsd", "/etc/dyndnsd/config.yml"]
diff --git a/init.d/debian-6-dyndnsd b/docs/debian-6-init-dyndnsd
old mode 100644
new mode 100755
similarity index 100%
rename from init.d/debian-6-dyndnsd
rename to docs/debian-6-init-dyndnsd