make the blueprint a little more practical

docker-compose.yml

@@ -0,0 +1,31 @@
+services:
+   postgres:
+      # a name, e.g.,  db_container is 
+      # instrumental to be
+      # called as host from the shiny app
+      container_name: db_container
+      image: postgres:latest
+      restart: always
+      environment:
+         - POSTGRES_USER=postgres
+         - POSTGRES_PASSWORD=postgres
+      # This port mapping is only necessary 
+      # to connect from the host, 
+      # not to let containers talk to each other. 
+      ports:
+         - "5432:5432"
+      volumes:
+         - "./pgdata:/var/lib/postgresql/data"
+   shiny: 
+      container_name: shiny
+      depends_on: 
+         - postgres
+      image: rocker/shiny:latest
+      platform: linux/amd64
+      volumes:
+         - "./shiny-logs:/var/log/shiny-server"
+         - "./shiny-home:/srv/shiny-server"
+         - "./entrypoint.sh:/entrypoint.sh"
+      ports:
+         - "3838:3838"
+      entrypoint: ["/entrypoint.sh"]

entrypoint.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+R -e 'install.packages("shinydashboard")'
+exec shiny-server
+