add db host to notebook

Author: raphaeltm

samples/jupyter-postgres/compose.yaml

@@ -11,6 +11,7 @@ services:
     environment:
       JUPYTER_TOKEN:
       POSTGRES_PASSWORD:
+      DATABASE_HOST: db
     healthcheck:
       test: ["CMD", "curl", "-f", "http://localhost:8888/login" ]
     depends_on:

samples/jupyter-postgres/jupyter/notebooks/Titanic.ipynb

@@ -70,15 +70,15 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": null,
    "id": "0f663e69-0d11-4bbc-b594-df4cc0497aeb",
    "metadata": {},
    "outputs": [],
    "source": [
     "import os\n",
     "DB_USER = 'postgres'\n",
     "DB_PASSWORD = os.getenv('POSTGRES_PASSWORD')\n",
-    "DB_HOST = 'db'  # Docker Compose service name\n",
+    "DB_HOST = os.getenv('DATABASE_HOST')  # Docker Compose service name\n",
     "DB_PORT = '5432'\n",
     "DB_NAME = 'postgres'"
    ]