add option for custom hostname via label + update examples

.env.dist

@@ -1,4 +1,5 @@
 DB_TUNNEL_NETWORK=db-tunnel-network
+DB_TUNNEL_NETWORK_HOSTNAME_LABEL=db.network.tunnel.hostname
 DB_TUNNEL_CONTAINER_NAME=db-tunnel-sshd
 DB_TUNNEL_CONTAINER_PORT=22666
 DB_CONTAINER_NAME_PATTERN="mariadb|mysql"

README.md

@@ -1,4 +1,4 @@
-![latest 0.1.0](https://img.shields.io/badge/latest-0.1.0-green.svg?style=flat)
+![latest 0.2.0](https://img.shields.io/badge/latest-0.2.0-green.svg?style=flat)
 [![license](https://img.shields.io/github/license/webcore/snitcher.svg?maxAge=2592000)](https://opensource.org/licenses/MIT)
 
 # Docker DB tunnel
@@ -26,17 +26,58 @@ Run shell script to create network, sshd container and connect all db containers
 $ ./docker-db-tunnel.sh
 Creating db tunnel network: db-tunnel-network
 668e40197c800a612ea748b9778d3f0888333673f7588d4a0bb1e027bd5d22d4
-Running db tunnel container with name: db-tunnel-sshd
+Running db tunnel container db-tunnel-sshd on port 22666
 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
+Connecting project_mysql_1 to db-tunnel-network with hostname (alias) project_db_host
 ```
 
-### 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).
+### Docker-compose services example
+
+docker-compose-project.yml
+```yaml
+services:
+  project_mysql:
+    container_name: project_mysql_1
+    image: mariadb
+    environment:
+      - MYSQL_ALLOW_EMPTY_PASSWORD=yes
+    labels:
+      - db.network.tunnel.hostname=project_db_host
+    network_mode: "bridge"
+```
+
+docker-compose-symfony-demo.yml
+```yaml
+services:
+  symfony-demo_mariadb:
+    container_name: symfony-demo_mariadb_1
+    image: mariadb
+    environment:
+    - MYSQL_ALLOW_EMPTY_PASSWORD=yes
+    network_mode: "bridge"
+```
+
+### SSH Tunnel settings
+The **root** password for SSH is in `sickp/alpine-sshd` "**root**".  
+You can also [change default root password](https://github.com/sickp/docker-alpine-sshd#change-root-password).
+
+### Connection settings example
+
+```
+MySQL host: project_mysql_1 
+# or via alias 
+# MySQL host: project_db_host
+Username: root
+Port: 3306
+
+SSH Host: 127.0.0.1
+SSH User: root
+SSH Password: root
+SSH Port: 22666
+```
 
-### Sequel Pro connection details
 ![Sequel Pro screenshot](./docker-db-tunnel.png)
 
 ## Customize
@@ -45,6 +86,7 @@ It is easy to extend via your own .env file:
 
 ```dotenv
 DB_TUNNEL_NETWORK=db-tunnel-network
+DB_TUNNEL_NETWORK_HOSTNAME_LABEL=db.network.tunnel.hostname
 DB_TUNNEL_CONTAINER_NAME=db-tunnel-sshd
 DB_TUNNEL_CONTAINER_PORT=22666
 DB_CONTAINER_NAME_PATTERN="mariadb|mysql" #pattern for docker ps filtering

docker-db-tunnel.sh

@@ -7,6 +7,7 @@ RESTORE=$(echo -en '\033[0m')
 test -f .env && source .env
 
 DB_TUNNEL_NETWORK=${DB_TUNNEL_NETWORK:-'db-tunnel-network'}
+DB_TUNNEL_NETWORK_HOSTNAME_LABEL=${DB_TUNNEL_NETWORK_HOSTNAME_LABEL:-'db.network.tunnel.hostname'}
 DB_TUNNEL_CONTAINER_NAME=${DB_TUNNEL_CONTAINER_NAME:-'db-tunnel-sshd'}
 DB_TUNNEL_CONTAINER_PORT=${DB_TUNNEL_CONTAINER_PORT:-'22666'}
 DB_CONTAINER_NAME_PATTERN=${DB_CONTAINER_NAME_PATTERN:-'mariadb|mysql'}
@@ -21,18 +22,23 @@ fi
 # return true/false or error if not exist
 IS_TUNNEL_CONTAINER_RUNNING=$(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}"
+    echo "Running db tunnel container ${GREEN}${DB_TUNNEL_CONTAINER_NAME}${RESTORE} on port ${GREEN}${DB_TUNNEL_CONTAINER_PORT}${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=${DB_CONTAINER_NAME_PATTERN}" --format "{{.Names}} {{.Networks}}" \
+docker ps --filter "status=running" --filter "name=${DB_CONTAINER_NAME_PATTERN}" --format '{{.Names}} {{.Networks}} {{.Label "'${DB_TUNNEL_NETWORK_HOSTNAME_LABEL}'"}}' \
 | 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} ${container_name};
+| cut -d ' ' -f 1,3 \
+| while read container_name host_name; do
+    if [ "$host_name" == "" ]; then
+        echo "Connecting ${YELLOW}${container_name}${RESTORE} to ${DB_TUNNEL_NETWORK}";
+        docker network connect ${DB_TUNNEL_NETWORK} ${container_name};
+    else
+        echo "Connecting ${YELLOW}${container_name}${RESTORE} to ${DB_TUNNEL_NETWORK} with hostname (alias) ${YELLOW}${host_name}${RESTORE}";
+        docker network connect ${DB_TUNNEL_NETWORK} ${container_name}  --alias ${host_name};
+    fi
   done

example/docker-compose-project.yml

@@ -0,0 +1,12 @@
+version: '3.7'
+
+services:
+#  mysql:
+  project_mysql:
+    container_name: project_mysql_1
+    image: mariadb
+    environment:
+    - MYSQL_ALLOW_EMPTY_PASSWORD=yes
+    labels:
+    - db.network.tunnel.hostname=project_db_host
+    network_mode: "bridge"

example/docker-compose-symfony-demo.yml

@@ -0,0 +1,10 @@
+version: '3.7'
+
+services:
+#  mariadb:
+  symfony-demo_mariadb:
+    container_name: symfony-demo_mariadb_1
+    image: mariadb
+    environment:
+    - MYSQL_ALLOW_EMPTY_PASSWORD=yes
+    network_mode: "bridge"

example/docker-compose-symfony-demo2.yml

@@ -0,0 +1,10 @@
+version: '3.7'
+
+services:
+#  mariadb:
+  symfony-demo2_mariadb:
+    container_name: symfony-demo2_mariadb_1
+    image: mariadb
+    environment:
+    - MYSQL_ALLOW_EMPTY_PASSWORD=yes
+    network_mode: "bridge"