add port forwarding

README.md

@@ -21,6 +21,9 @@ services:
       - "./yggdrasil:/etc/yggdrasil"
     sysctls:
       - "net.ipv6.conf.all.disable_ipv6=0"
+    environment:
+      - BIND_PORT=80
+      - BIND_ADDRESS=nginx
 ```
 
 ## docker cli
@@ -36,3 +39,12 @@ docker run \
 yggdrasil
 ```
 
+# Parameters
+
+Container images are configured using parameters passed at runtime.
+
+|Parameter|Function|
+|:--------|:-------|
+|-e BIND_PORT|Port to forward.|
+|-e BIND_ADDRESS|Address of another docker service to forward to.|
+

docker-compose.yml

@@ -4,6 +4,9 @@ services:
       context: https://git.bitdeals.org/private/yggdrasil.git
       dockerfile: ./docker/Dockerfile
     image: registry.bitdeals.org/yggdrasil
+    environment:
+      - BIND_PORT=
+      - BIND_ADDRESS=
     restart: unless-stopped
     cap_add:
       - NET_ADMIN

docker/Dockerfile

@@ -3,7 +3,7 @@ FROM debian:testing-slim
 SHELL [ "/bin/sh", "-eux", "-c" ]
 
 RUN apt-get update \
-	&& apt-get install -y --no-install-recommends yggdrasil wget ca-certificates unzip libcap2-bin gosu ;\
+	&& apt-get install -y --no-install-recommends yggdrasil wget ca-certificates unzip libcap2-bin gosu socat;\
 	apt-get clean ;\
 	rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 

docker/run.sh

@@ -1,5 +1,8 @@
 #!/bin/sh
 
+BIND_PORT=${BIND_PORT:-80}
+BIND_ADDRESS=${BIND_ADDRESS:-127.0.0.1}
+
 if ! [ -d /var/run/yggdrasil ]
 then
 	install -d -o yggdrasil -g yggdrasil /run/yggdrasil /var/run/yggdrasil
@@ -13,6 +16,13 @@ then
 fi
 
 
+# Port forwarding to another docker service
+while sleep 1;
+do
+  socat TCP6-LISTEN:$BIND_PORT,fork,forever,reuseaddr TCP4:$BIND_ADDRESS:$BIND_PORT
+done
+
+
 # Show node address
 until yggdrasilctl getself | grep -v "^[[:digit:]]"
 do