Deployment setup: Update Django settings to use environment variables

README.md

@@ -253,6 +253,8 @@ services:
     # command to run when the container starts
     command: >
       sh -c 'python manage.py runserver 0.0.0.0:8000'
+    environment:
+      - DEBUG=1
 ```
 - Build the docker image
     ```bash
@@ -342,7 +344,6 @@ DATABASES = {
         'USER': os.environ.get('DB_USER'),
         'PASSWORD': os.environ.get('DB_PASS'),
         'HOST': os.environ.get('DB_HOST'),
-        'PORT': os.environ.get('DB_PORT'),
     }
 }
 ```
@@ -709,7 +710,6 @@ services:
             - DB_NAME=${DB_NAME}
             - DB_USER=${DB_USER}
             - DB_PASS=${DB_PASS}
-            - DB_PORT=${DB_PORT}
             - SECRET_KEY=${DJANGO_SECRET_KEY}
             - ALLOWED_HOSTS=${DJANGO_ALLOWED_HOSTS}
         depends_on:
@@ -738,3 +738,16 @@ volumes:
     postgres-data:
     static-data:
 ```
+
+#### Update Django settings to use environment variables
+```
+SECRET_KEY = os.environ.get('SECRET_KEY', 'changeme')
+DEBUG = bool(int(os.environ.get('DEBUG', 0)))
+ALLOWED_HOSTS = []
+ALLOWED_HOSTS.extend(
+    filter(
+        None,
+        os.environ.get('ALLOWED_HOSTS', '').split(','),
+    )
+)
+```

app/app/settings.py

@@ -21,12 +21,18 @@
 # See https://docs.djangoproject.com/en/3.2/howto/deployment/checklist/
 
 # SECURITY WARNING: keep the secret key used in production secret!
-SECRET_KEY = 'django-insecure-m0mui7moly5t#jbn74mxr35o&c%ijo5s3xd7n5d$m^mun^kv$r'
+SECRET_KEY = os.environ.get('SECRET_KEY', 'changeme')
 
 # SECURITY WARNING: don't run with debug turned on in production!
-DEBUG = True
+DEBUG = bool(int(os.environ.get('DEBUG', 0)))
 
 ALLOWED_HOSTS = []
+ALLOWED_HOSTS.extend(
+    filter(
+        None,
+        os.environ.get('ALLOWED_HOSTS', '').split(','),
+    )
+)
 
 
 # Application definition
@@ -89,7 +95,6 @@
         'USER': os.environ.get('DB_USER'),
         'PASSWORD': os.environ.get('DB_PASS'),
         'HOST': os.environ.get('DB_HOST'),
-        'PORT': os.environ.get('DB_PORT'),
     }
 }
 

commands.md

@@ -43,6 +43,10 @@ $ docker volume ls
 ```bash
 $ docker volume rm <volume_name>
 ```
+- Down containers of specific docker-compose.yml file
+```bash
+$ docker compose -f <docker-compose-deploy.yml> down
+```
 
 ## Run commands inside the container
 - Using `docker compose run` command

docker-compose-deploy.yml

@@ -12,7 +12,6 @@ services:
             - DB_NAME=${DB_NAME}
             - DB_USER=${DB_USER}
             - DB_PASS=${DB_PASS}
-            - DB_PORT=${DB_PORT}
             - SECRET_KEY=${DJANGO_SECRET_KEY}
             - ALLOWED_HOSTS=${DJANGO_ALLOWED_HOSTS}
         depends_on:
@@ -33,7 +32,7 @@ services:
         depends_on:
             - app
         ports:
-            - 80:8000
+            - 8000:8000
         volumes:
             - static-data:/vol/static
 

docker-compose.yml

@@ -23,6 +23,7 @@ services:
       - DB_NAME=devdb
       - DB_USER=devuser
       - DB_PASS=postgres
+      - DEBUG=1
 
   db:
     image: postgres:13-alpine