add docker health status, keep python3.9: deps not updated for 3.10 yet

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3-slim-bullseye as base
+FROM python:3.9-slim-bullseye as base
 
 FROM base as builder
 
@@ -8,7 +8,7 @@ RUN apt-get update && apt-get -y install build-essential libssl-dev libffi-dev p
     mkdir /install
 WORKDIR /install
 COPY requirements.txt .
-RUN python -m pip install --prefix=/install --no-cache-dir --upgrade pip && \
+RUN python -m pip install --no-cache-dir --upgrade pip && \
     pip install --prefix=/install --no-cache-dir -r requirements.txt && \
     rm -rf /var/lib/apt/lists/* && \
     apt-get clean
@@ -19,7 +19,7 @@ COPY --from=builder /install /usr/local
 COPY app /app
 WORKDIR /app
 RUN apt-get update && \
-    apt-get -y install iputils-ping nmap && \
+    apt-get -y install iputils-ping nmap curl && \
     rm -rf /var/lib/apt/lists/*
 
 CMD ["./run.sh"]

app/wol/urls.py

@@ -9,5 +9,6 @@ urlpatterns = [
     path("settings/scan/", views.settings_scan, name="settings_scan"),
     path("settings/scan_add/", views.settings_scan_add, name="settings_scan_add"),
     path("settings/custom_add/", views.settings_custom_add, name="settings_custom_add"),
-    path("settings/del/", views.settings_del, name="settings_del")
+    path("settings/del/", views.settings_del, name="settings_del"),
+    path("health/", views.health, name="health")
 ]

app/wol/views.py

@@ -6,7 +6,7 @@ import subprocess
 from asgiref.sync import async_to_sync
 from channels.layers import get_channel_layer
 from django.http import HttpResponseRedirect
-from django.http.response import JsonResponse
+from django.http.response import HttpResponse, HttpResponseServerError, JsonResponse
 from django.shortcuts import render
 from django.utils.decorators import method_decorator
 from django.views.decorators.csrf import csrf_exempt
@@ -164,3 +164,10 @@ def settings_del(request):
         })})
 
     return JsonResponse(data=data)
+
+def health(request):
+    try:
+        Settings.objects.all()
+        return HttpResponse("Ok")
+    except Exception:
+        return HttpResponseServerError("db: cannot connect to database.")

docker-compose.yml

@@ -4,9 +4,6 @@ services:
     container_name: upsnap_django
     image: seriousm4x/upsnap:latest
     network_mode: host
-    depends_on:
-      - upsnap_redis
-      - upsnap_postgres
     restart: always
     environment:
       - DJANGO_SUPERUSER_USER=admin
@@ -21,20 +18,32 @@ services:
       - POSTGRES_PASSWORD=upsnap
       - PING_INTERVAL=5
       - ENABLE_NOTIFICATIONS=True
+    healthcheck:
+      test: curl --fail -s http://localhost:$DJANGO_PORT/health/ || exit 1
+      interval: 10s
+    depends_on:
+      - upsnap_redis
+      - upsnap_postgres
   upsnap_redis:
     container_name: upsnap_redis
     image: redis:6
     network_mode: host
     restart: always
+    healthcheck:
+      test: redis-cli ping
+      interval: 10s
   upsnap_postgres:
     container_name: upsnap_postgres
     image: postgres:13-alpine
-    restart: always
     network_mode: host
+    restart: always
     environment:
       - "POSTGRES_USER=upsnap"
       - "POSTGRES_PASSWORD=upsnap"
       - "POSTGRES_DB=upsnap"
+    healthcheck:
+      test: pg_isready
+      interval: 10s
     volumes:
       - upsnap_db:/var/lib/postgresql/data
 volumes: