updated to use Alpine Linux as the base image.

This update fixes the typ0 in the Dockerfile (thanks @ignar) and creates a _much_ smaller image (<8 MB)

Dockerfile

@@ -9,20 +9,15 @@
 #
 ###
 
-FROM ubuntu:14.04
+FROM alpine:3.2
 MAINTAINER Kingsquare <docker@kingsquare.nl>
 
 ENV SSH_AUTH_SOCK /ssh-agent
 
 ####
-# Install the SSH-client + clean APT back up
-RUN DEBIAN_FRONTEND=noninteractive && \
-	apt-get update -q && \
-	apt-get install -yq openssh-client && \
-	apt-get autoremove --purge -yq
-	apt-get clean && \
-	rm -rf /tmp/* /var/tmp/* /var/lib/apt/lists/*
+# Install the SSH-client
+RUN apk add --update openssh-client && rm -rf /var/cache/apk/*
 
 VOLUME ["/ssh-agent"]
 EXPOSE 2222 
-ENTRYPOINT ["/usr/bin/ssh", "-T", "-N", "-o", "StrictHostKeyChecking=false", "-o", "ServerAliveInterval=180", "-L"]
+ENTRYPOINT ["/usr/bin/ssh", "-T", "-N", "-o", "StrictHostKeyChecking=false", "-o", "ServerAliveInterval=180", "-L"]

README.md

@@ -14,7 +14,11 @@ The full syntax for starting an image from this container:
 
 * you would like to have a tunnel port 3306 on server example.com locally exposed as 3306
 
-	docker run -d --name tunnel_mysql -v $SSH_AUTH_SOCK:/ssh-agent kingsquare/tunnel *:3306:localhost:3306 me@example.com
+	```docker run -d --name tunnel_mysql -v $SSH_AUTH_SOCK:/ssh-agent kingsquare/tunnel *:3306:localhost:3306 me@example.com```
+
+* you would like to have a tunnel port 3306 on server example.com locally exposed on the host as 3308
+
+	```docker run -d -p 3308:3306 --name tunnel_mysql -v $SSH_AUTH_SOCK:/ssh-agent kingsquare/tunnel *:3306:localhost:3306 me@example.com```
 
 
 # Using as an Ambassador
@@ -31,4 +35,14 @@ This method allows for using this image as an ambassador to other (secure) serve
 
 use the links in another container via exposed port 2222:
 
-	docker run --link staging-mongo:db.staging \ --link production-mongo:db.production \ my_app start
+	docker run --link staging-mongo:db.staging \ 
+	    --link production-mongo:db.production \
+	    my_app start
+
+# Changelog
+
+* 2015-11-10
+
+    Thanks to @ignar I took another look at the dockerfile and have updated it to use [AlpineLinux](http://www.alpinelinux.org/) 
+    This results in a _much_ smaller image (<8mb) and is still just as fast and functional. 
+    Thanks @ignar for bringing this container back to my attention :)