Update docker-example (#3324)

Author: masenf

docker-example/README.md

@@ -1,133 +1,30 @@
-# Reflex Docker Container
+# Reflex Docker Examples
 
-This example describes how to create and use a container image for Reflex with your own code.
+This directory contains several examples of how to deploy Reflex apps using docker.
 
-## Update Requirements
+In all cases, ensure that your `requirements.txt` file is up to date and
+includes the `reflex` package.
 
-The `requirements.txt` includes the reflex package which is needed to install
-Reflex framework. If you use additional packages in your project you have to add
-this in the `requirements.txt` first. Copy the `Dockerfile`, `.dockerignore` and
-the `requirements.txt` file in your project folder.
+## `simple-two-port`
 
-## Build Simple Reflex Container Image
+The most basic production deployment exposes two HTTP ports and relies on an
+existing load balancer to forward the traffic appropriately.
 
-The main `Dockerfile` is intended to build a very simple, single container deployment that runs
-the Reflex frontend and backend together, exposing ports 3000 and 8000.
+## `simple-one-port`
 
-To build your container image run the following command:
+This deployment exports the frontend statically and serves it via a single HTTP
+port using Caddy. This is useful for platforms that only support a single port
+or where running a node server in the container is undesirable.
 
-```bash
-docker build -t reflex-app:latest .
-```
+## `production-compose`
 
-## Start Container Service
+This deployment is intended for use with a standalone VPS that is only hosting a
+single Reflex app. It provides the entire stack in a single `compose.yaml`
+including a webserver, one or more backend instances, redis, and a postgres
+database.
 
-Finally, you can start your Reflex container service as follows:
+## `production-app-platform`
 
-```bash
-docker run -it --rm -p 3000:3000 -p 8000:8000 --name app reflex-app:latest
-```
-
-It may take a few seconds for the service to become available.
-
-Access your app at http://localhost:3000.
-
-Note that this container has _no persistence_ and will lose all data when
-stopped. You can use bind mounts or named volumes to persist the database and
-uploaded_files directories as needed.
-
-# Production Service with Docker Compose and Caddy
-
-An example production deployment uses automatic TLS with Caddy serving static files
-for the frontend and proxying requests to both the frontend and backend.
-
-Copy the following files to your project directory:
-  * `compose.yaml`
-  * `compose.prod.yaml`
-  * `compose.tools.yaml`
-  * `prod.Dockerfile`
-  * `Caddy.Dockerfile`
-  * `Caddyfile`
-
-The production app container, based on `prod.Dockerfile`, builds and exports the
-frontend statically (to be served by Caddy). The resulting image only runs the
-backend service.
-
-The `webserver` service, based on `Caddy.Dockerfile`, copies the static frontend
-and `Caddyfile` into the container to configure the reverse proxy routes that will
-forward requests to the backend service. Caddy will automatically provision TLS
-for localhost or the domain specified in the environment variable `DOMAIN`.
-
-This type of deployment should use less memory and be more performant since
-nodejs is not required at runtime.
-
-## Customize `Caddyfile` (optional)
-
-If the app uses additional backend API routes, those should be added to the
-`@backend_routes` path matcher to ensure they are forwarded to the backend.
-
-## Build Reflex Production Service
-
-During build, set `DOMAIN` environment variable to the domain where the app will
-be hosted!  (Do not include http or https, it will always use https).
-
-**If `DOMAIN` is not provided, the service will default to `localhost`.**
-
-```bash
-DOMAIN=example.com docker compose build
-```
-
-This will build both the `app` service from the `prod.Dockerfile` and the `webserver`
-service via `Caddy.Dockerfile`.
-
-## Run Reflex Production Service
-
-```bash
-DOMAIN=example.com docker compose up
-```
-
-The app should be available at the specified domain via HTTPS. Certificate
-provisioning will occur automatically and may take a few minutes.
-
-### Data Persistence
-
-Named docker volumes are used to persist the app database (`db-data`),
-uploaded_files (`upload-data`), and caddy TLS keys and certificates
-(`caddy-data`).
-
-## More Robust Deployment
-
-For a more robust deployment, consider bringing the service up with
-`compose.prod.yaml` which includes postgres database and redis cache, allowing
-the backend to run with multiple workers and service more requests.
-
-```bash
-DOMAIN=example.com docker compose -f compose.yaml -f compose.prod.yaml up -d
-```
-
-Postgres uses its own named docker volume for data persistence.
-
-## Admin Tools
-
-When needed, the services in `compose.tools.yaml` can be brought up, providing
-graphical database administration (Adminer on http://localhost:8080) and a
-redis cache browser (redis-commander on http://localhost:8081). It is not recommended
-to deploy these services if they are not in active use.
-
-```bash
-DOMAIN=example.com docker compose -f compose.yaml -f compose.prod.yaml -f compose.tools.yaml up -d
-```
-
-# Container Hosting
-
-Most container hosting services automatically terminate TLS and expect the app
-to be listening on a single port (typically `$PORT`).
-
-To host a Reflex app on one of these platforms, like Google Cloud Run, Render,
-Railway, etc, use `app.Dockerfile` to build a single image containing a reverse
-proxy that will serve that frontend as static files and proxy requests to the
-backend for specific endpoints.
-
-If the chosen platform does not support buildx and thus heredoc, you can copy
-the Caddyfile configuration into a separate Caddyfile in the root of the
-project.
+This example deployment is intended for use with App hosting platforms, like
+Azure, AWS, or Google Cloud Run. It is the backend of the deployment, which
+depends on a separately hosted redis instance and static frontend deployment.

docker-example/production-app-platform/.dockerignore

@@ -0,0 +1,5 @@
+.web
+.git
+__pycache__/*
+Dockerfile
+uploaded_files

docker-example/production-app-platform/Dockerfile

@@ -0,0 +1,65 @@
+# This docker file is intended to be used with container hosting services
+#
+# After deploying this image, get the URL pointing to the backend service
+# and run API_URL=https://path-to-my-container.example.com reflex export frontend
+# then copy the contents of `frontend.zip` to your static file server (github pages, s3, etc).
+#
+# Azure Static Web App example:
+#    npx @azure/static-web-apps-cli deploy --env production --app-location .web/_static
+#
+# For dynamic routes to function properly, ensure that 404s are redirected to /404 on the
+# static file host (for github pages, this works out of the box; remember to create .nojekyll).
+#
+# For azure static web apps, add `staticwebapp.config.json` to to `.web/_static` with the following:
+#  {
+#     "responseOverrides": {
+#        "404": {
+#            "rewrite": "/404.html"
+#        }
+#     }
+#  }
+#
+# Note: many container hosting platforms require amd64 images, so when building on an M1 Mac
+# for example, pass `docker build --platform=linux/amd64 ...`
+
+# Stage 1: init
+FROM python:3.11 as init
+
+ARG uv=/root/.cargo/bin/uv
+
+# Install `uv` for faster package boostrapping
+ADD --chmod=755 https://astral.sh/uv/install.sh /install.sh
+RUN /install.sh && rm /install.sh
+
+# Copy local context to `/app` inside container (see .dockerignore)
+WORKDIR /app
+COPY . .
+RUN mkdir -p /app/data /app/uploaded_files
+
+# Create virtualenv which will be copied into final container
+ENV VIRTUAL_ENV=/app/.venv
+ENV PATH="$VIRTUAL_ENV/bin:$PATH"
+RUN $uv venv
+
+# Install app requirements and reflex inside virtualenv
+RUN $uv pip install -r requirements.txt
+
+# Deploy templates and prepare app
+RUN reflex init
+
+# Stage 2: copy artifacts into slim image 
+FROM python:3.11-slim
+WORKDIR /app
+RUN adduser --disabled-password --home /app reflex
+COPY --chown=reflex --from=init /app /app
+# Install libpq-dev for psycopg2 (skip if not using postgres).
+RUN apt-get update -y && apt-get install -y libpq-dev && rm -rf /var/lib/apt/lists/*
+USER reflex
+ENV PATH="/app/.venv/bin:$PATH" PYTHONUNBUFFERED=1
+
+# Needed until Reflex properly passes SIGTERM on backend.
+STOPSIGNAL SIGKILL
+
+# Always apply migrations before starting the backend.
+CMD [ -d alembic ] && reflex db migrate; \
+    exec reflex run --env prod --backend-only --backend-port ${PORT:-8000}

docker-example/production-app-platform/README.md

@@ -0,0 +1,113 @@
+# production-app-platform
+
+This example deployment is intended for use with App hosting platforms, like
+Azure, AWS, or Google Cloud Run.
+
+## Architecture
+
+The production deployment consists of a few pieces:
+  * Backend container - built by `Dockerfile` Runs the Reflex backend
+    service on port 8000 and is scalable to multiple instances.
+  * Redis container - A single instance the standard `redis` docker image should
+    share private networking with the backend
+  * Static frontend - HTML/CSS/JS files that are hosted via a CDN or static file
+    server. This is not included in the docker image.
+
+## Deployment
+
+These general steps do not cover the specifics of each platform, but all platforms should
+support the concepts described here.
+
+### Vnet
+
+All containers in the deployment should be hooked up to the same virtual private
+network so they can access the redis service and optionally the database server.
+The vnet should not be exposed to the internet, use an ingress rule to terminate
+TLS at the load balancer and forward the traffic to a backend service replica.
+
+### Redis
+
+Deploy a `redis` instance on the vnet.
+
+### Backend
+
+The backend is built by the `Dockerfile` in this directory. When deploying the
+backend, be sure to set REDIS_URL=redis://internal-redis-hostname to connect to
+the redis service.
+
+### Ingress
+
+Configure the load balancer for the app to forward traffic to port 8000 on the 
+backend service replicas. Most platforms will generate an ingress hostname
+automatically. Make sure when you access the ingress endpoint on `/ping` that it
+returns "pong", indicating that the backend is up an available.
+
+### Frontend
+
+The frontend should be hosted on a static file server or CDN.
+
+**Important**: when exporting the frontend, set the API_URL environment variable
+to the ingress hostname of the backend service.
+
+If you will host the frontend from a path other than the root, set the
+`FRONTEND_PATH` environment variable appropriately when exporting the frontend.
+
+Most static hosts will automatically use the `/404.html` file to handle 404
+errors. _This is essential for dynamic routes to work correctly._ Ensure that
+missing routes return the `/404.html` content to the user if this is not the
+default behavior.
+
+_For Github Pages_: ensure the file `.nojekyll` is present in the root of the repo
+to avoid special processing of underscore-prefix directories, like `_next`.
+
+## Platform Notes
+
+The following sections are currently a work in progress and may be incomplete.
+
+### Azure
+
+In the Azure load balancer, per-message deflate is not supported. Add the following
+to your `rxconfig.py` to workaround this issue.
+
+```python
+import uvicorn.workers
+
+import reflex as rx
+
+
+class NoWSPerMessageDeflate(uvicorn.workers.UvicornH11Worker):
+    CONFIG_KWARGS = {
+        **uvicorn.workers.UvicornH11Worker.CONFIG_KWARGS,
+        "ws_per_message_deflate": False,
+    }
+
+
+config = rx.Config(
+    app_name="my_app",
+    gunicorn_worker_class="rxconfig.NoWSPerMessageDeflate",
+)
+```
+
+#### Persistent Storage
+
+If you need to use a database or upload files, you cannot save them to the
+container volume. Use Azure Files and mount it into the container at /app/uploaded_files.
+
+#### Resource Types
+
+* Create a new vnet with 10.0.0.0/16
+  * Create a new subnet for redis, database, and containers
+* Deploy redis as a Container Instances
+* Deploy database server as "Azure Database for PostgreSQL"
+  * Create a new database for the app
+  * Set db-url as a secret containing the db user/password connection string
+* Deploy Storage account for uploaded files
+  * Enable access from the vnet and container subnet
+  * Create a new file share
+  * In the environment, create a new files share (get the storage key)
+* Deploy the backend as a Container App
+  * Create a custom Container App Environment linked up to the same vnet as the redis container.
+  * Set REDIS_URL and DB_URL environment variables
+  * Add the volume from the environment
+  * Add the volume mount to the container
+* Deploy the frontend as a Static Web App

docker-example/.dockerignore …example/production-compose/.dockerignoredocker-example/.dockerignore renamed to docker-example/production-compose/.dockerignore docker-example/.dockerignore renamed to docker-example/production-compose/.dockerignore

@@ -42,10 +42,11 @@ COPY --chown=reflex --from=init /app /app
 # Install libpq-dev for psycopg2 (skip if not using postgres).
 RUN apt-get update -y && apt-get install -y libpq-dev && rm -rf /var/lib/apt/lists/*
 USER reflex
-ENV PATH="/app/.venv/bin:$PATH"
+ENV PATH="/app/.venv/bin:$PATH" PYTHONUNBUFFERED=1
 
 # Needed until Reflex properly passes SIGTERM on backend.
 STOPSIGNAL SIGKILL
 
 # Always apply migrations before starting the backend.
-CMD reflex db migrate && reflex run --env prod --backend-only
+CMD [ -d alembic ] && reflex db migrate; \
+    exec reflex run --env prod --backend-only