master: Make debug level configurable.

Dockerfile

@@ -5,9 +5,9 @@ RUN apk add --update openssh-client && rm -rf /var/cache/apk/*
 
 CMD rm -rf /root/.ssh && mkdir /root/.ssh && cp -R /root/ssh/* /root/.ssh/ && chmod -R 600 /root/.ssh/* && \
 ssh \
--vv \
+$SSH_DEBUG \
 -o StrictHostKeyChecking=no \
 -N $TUNNEL_HOST \
 -L *:$LOCAL_PORT:$REMOTE_HOST:$REMOTE_PORT \
 && while true; do sleep 30; done;
-EXPOSE 1-65535
+EXPOSE 1-65535

README.md

@@ -34,6 +34,7 @@ This Docker creates a simple SSH tunnel over a server. It is very useful when yo
         volumes:
           - $HOME/.ssh:/root/ssh:ro
         environment:
+	  SSH_DEBUG: "-v"
           TUNNEL_HOST: mysql-tunnel
           REMOTE_HOST: tunneled-sql.corporate.internal.tld
           LOCAL_PORT: 3306
@@ -42,4 +43,4 @@ This Docker creates a simple SSH tunnel over a server. It is very useful when yo
 
 5. Run `docker-compose up -d`
 
-After you start up docker containers, any container in the same network will be able to access to tunneled mysql instance using ```tcp://mysql:3306```. Of course you can also expose port 3306 to be able to access to tunneled resource from your host machine.
+After you start up docker containers, any container in the same network will be able to access to tunneled mysql instance using ```tcp://mysql:3306```. Of course you can also expose port 3306 to be able to access to tunneled resource from your host machine.