update base image to minimize image size

docker-proxy/Dockerfile

@@ -1,9 +1,13 @@
-FROM ubuntu
-RUN apt update \
-&& apt install -y openssh-server
+FROM alpine:3.6
+
+MAINTAINER Newnius <docker@newnius.com>
+
+RUN apk add --no-cache  openssh
 
 RUN ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa
+
 RUN cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
 
 ADD bootstrap.sh /etc/bootstrap.sh
+
 CMD ["bash", "/etc/bootstrap.sh"]

docker-proxy/README.md

@@ -0,0 +1,8 @@
+```bash
+docker service create \
+--replicas 1 \
+--name proxy_docker \
+--network swarm-net \
+-p 7001:7001 \
+newnius/docker-proxy
+```

docker-proxy/bootstrap.sh

@@ -1,4 +1,15 @@
 #! /bin/bash
 
-/etc/init.d/ssh start
+# from https://github.com/danielguerra69/alpine-sshd
+if [ ! -f "/etc/ssh/ssh_host_rsa_key" ]; then
+	# generate fresh rsa key
+	ssh-keygen -f /etc/ssh/ssh_host_rsa_key -N '' -t rsa
+fi
+if [ ! -f "/etc/ssh/ssh_host_dsa_key" ]; then
+	# generate fresh dsa key
+	ssh-keygen -f /etc/ssh/ssh_host_dsa_key -N '' -t dsa
+fi
+
+
+/etc/init.d/sshd start
 ssh -t -t -D 0.0.0.0:7001 -o StrictHostKeyChecking=no localhost