Add first docker-db-tunnel version

Author: speto

.env.dist

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+DB_TUNNEL_NETWORK=db-tunnel-network
+DB_TUNNEL_CONTAINER_NAME=db-tunnel-sshd
+DB_TUNNEL_CONTAINER_PORT=22666
+DB_CONTAINER_NAME_PATTERN="mariadb|mysql"

.gitignore

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+.env

README.md

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+![latest 0.1.0](https://img.shields.io/badge/latest-0.1.0-green.svg?style=flat)
+[![license](https://img.shields.io/github/license/webcore/snitcher.svg?maxAge=2592000)](https://opensource.org/licenses/MIT)
+
+# Docker DB tunnel
+
+Simple tool to avoid an exposed container port conflicts when using databases in multiple docker projects. 
+Main idea is to use the ssh tunnel and connect all databases to one network with sshd container.  
+
+
+Inspired by [nginx-proxy](https://github.com/jwilder/nginx-proxy) Automated Nginx Reverse Proxy for Docker.  
+It uses [sickp/alpine-sshd](https://hub.docker.com/r/sickp/alpine-sshd/) A lightweight OpenSSH Docker Image built atop Alpine..
+
+## Install
+
+Download
+
+```shell
+git clone https://github.com/speto/docker-db-tunnel
+```
+
+## Usage
+
+Run shell script to create network, sshd container and connect all db containers:
+
+```shell
+$ ./docker-db-tunnel.sh
+Creating db tunnel network: db-tunnel-network
+668e40197c800a612ea748b9778d3f0888333673f7588d4a0bb1e027bd5d22d4
+Running db tunnel container with name: db-tunnel-sshd
+164e5a3c3b446169f928a03c135594493843664fef5ffa3edf820dd5de06f0a1
+Connecting symfony-demo_mariadb_1 to db-tunnel-network
+Connecting symfony-demo2_mariadb_1 to db-tunnel-network
+Connecting project_mysql_1 to db-tunnel-network
+```
+
+### SSH Tunnel options
+The **root** password for SSH is "**root**". How to [change-root-password](https://github.com/sickp/docker-alpine-sshd#change-root-password).
+
+### Sequel Pro connection details
+![Sequel Pro screenshot](./docker-db-tunnel.png)
+
+## Customize
+
+It is easy to extend via your own .env file:
+
+```dotenv
+DB_TUNNEL_NETWORK=db-tunnel-network
+DB_TUNNEL_CONTAINER_NAME=db-tunnel-sshd
+DB_TUNNEL_CONTAINER_PORT=22666
+DB_CONTAINER_NAME_PATTERN="mariadb|mysql" #pattern for docker ps filtering
+```
+
+### MIT license
+
+Copyright (c) 2018, Štefan Peťovský

docker-db-tunnel.png

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+#!/usr/bin/env bash
+
+GREEN=$(echo -en '\033[00;32m')
+YELLOW=$(echo -en '\033[00;33m')
+RESTORE=$(echo -en '\033[0m')
+
+test -f .env && source .env
+
+DB_TUNNEL_NETWORK=${DB_TUNNEL_NETWORK:-'db-tunnel-network'}
+DB_TUNNEL_CONTAINER_NAME=${DB_TUNNEL_CONTAINER_NAME:-'db-tunnel-sshd'}
+DB_TUNNEL_CONTAINER_PORT=${DB_TUNNEL_CONTAINER_PORT:-'22666'}
+DB_CONTAINER_NAME_PATTERN=${DB_CONTAINER_NAME_PATTERN:-'mariadb|mysql'}
+
+docker network inspect ${DB_TUNNEL_NETWORK} &> /dev/null
+if [ $? -eq 1 ]
+then
+    echo "Creating db tunnel network: ${GREEN}${DB_TUNNEL_NETWORK}${RESTORE}"
+    docker network create ${DB_TUNNEL_NETWORK}
+fi
+
+# return true/false or error if not exist
+IS_TUNNEL_CONTAINER_RUNNING=$(docker inspect -f "{{.State.Running}}" ${DB_TUNNEL_CONTAINER_NAME} 2> /dev/null)
+if [ "$IS_TUNNEL_CONTAINER_RUNNING" == "" ]; then
+    echo "Running db tunnel container with name: ${GREEN}${DB_TUNNEL_CONTAINER_NAME}${RESTORE}"
+    docker run -d -p ${DB_TUNNEL_CONTAINER_PORT}:22 --restart=always --name ${DB_TUNNEL_CONTAINER_NAME} --network ${DB_TUNNEL_NETWORK} sickp/alpine-sshd
+elif [ "$IS_TUNNEL_CONTAINER_RUNNING" == "false" ]; then
+    echo "Starting existing db tunnel container with name: ${GREEN}${DB_TUNNEL_CONTAINER_NAME}${RESTORE}"
+    docker start ${DB_TUNNEL_CONTAINER_NAME} 1> /dev/null
+fi
+
+# @todo consider filter by label (e.g. label=db.network.tunnel, label=database, label=mysql)
+docker ps --filter "status=running" --filter "name=${DB_CONTAINER_NAME_PATTERN}" --format "{{.Names}} {{.Networks}}" \
+| grep -v ${DB_TUNNEL_NETWORK} \
+| cut -d ' ' -f 1 \
+| while read container_name ; do
+    echo "Connecting ${YELLOW}${container_name}${RESTORE} to ${DB_TUNNEL_NETWORK}";
+    docker network connect ${DB_TUNNEL_NETWORK} ${container_name};
+  done