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Graph/container-missing-dependencies

AntiPattern

Container Runtime Missing Dependencies

container-missing-dependencies

FastAPI deployments inside containers fail silently or at startup because the container environment lacks required executables, shared libraries, or trust configuration, leading to hung connectivity, missing CLI tools, or missing libcurl errors.

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Updated5/30/2026

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30 linked nodes

MATCHESSolution

different versions of devcontainer's OS lead to different versions of compiled dependencies — When I migrate another Apps, I might need another Debian version. Tension: this would lead to the packages land in the sam. Outcome: I figured out later.

MATCHESSolution

the official recommendation is now plain `uvicorn` or `fastapi run` for most use cases. — Starting with FastAPI 0.110. Tension: there's no need for Gunicorn. Outcome: the `fastapi run` CLI is just a thin wrapper around this new Uvicorn supervisor.

MATCHESSolution

According to the FastAPI documentation about deploying FastAPI on Docker behind a proxy, you need to enable proxy headers. — if you're using it. Tension: Uvicorn (if you're using it) does not trust proxy headers by default unless specified. Outcome: Additionally, Starlette provides information about Uvicorn middleware for handling proxy header.

MATCHESSolution

This issue on github offers a solution github. — since fastapi and fastHTML are focusing on diffrent logics. Tension: there are diffrent tools included. Outcome: but since fastapi and fastHTML are focusing on diffrent logics.

MATCHESSolution

You can use a global dependency: — FastAPI. Tension: there's no way to set auth tokens in the docs. Outcome: app.openapi = custom_openapi.

MATCHESSolution

launched the web app with the built-in fastapi command — Now my dockerfile looks like this. Tension: problem seems to be gone. Outcome: CMD ["fastapi", "run", "main", "--port", "8121", "--workers", "3"].

MATCHESSolution

Could try adding catch_response to see what's actually happening. Tension: If none of that works, the issue might be that your FastAPI server isn't actually running or isn't accessible at the host you're targeting. Outcome: print(f"Status: {response.status_code}, Text: {response.text}").

MATCHESSolution

Try `fastapi run` instead of `fastapi dev` — if you use --reload or reload=True.

MATCHESSolution

This mismatch necessitates a manual conversion of the OpenAPI document to version 2.0 — before it can be utilized by API Gateway. Tension: Incompatibility issue between the OpenAPI document supported by GCP API Gateway, and the OpenAPI document automatically generated from FastAPI itself. Outcome: The Solution: For this will be clearly explained in the Link.

MATCHESSolution

you might need to add the path to the module like so — Dockerfile. Tension: Depending on where your Dockerfile is in your structure, which is unclear. Outcome: CMD ["uvicorn", "backend.app.main:app", "--host", "0.0.0.0", "--port", "8000"].

MATCHESSolution

Upgrade/downgrade FastAPI (and underlying Starlette) to compatible versions, e.g., reinstall with a specific FastAPI version such as fastapi==0.115.6 after uninstalling fastapi/starlette/pydantic.

MATCHESSolution

you can install it using `pip install fastapi-cli` — fastapi doesn't ship with the CLI anymore by default. Outcome: pip install fastapi-cli.

MATCHESSolution

Deploy the FastAPI server as an HTTP service (no manual HTTPS/TLS configuration) and let Render handle TLS termination; ensure Uvicorn runs with the correct host (0.0.0.0) and the PORT environment variable.

MATCHESSolution

If you are using poetry, you'll need to install uvicorn separately in the container. Outcome: you'll need to install uvicorn separately in the container.

MATCHESSolution

I have solved it using the lifespan of FastAPI. — use it inside the routes. Tension: I couldn't identify where the problem is. Outcome: I have just initialized the Pubsub client in LifeSpan.

MATCHESSolution

Install gunicorn in the runtime stage with pip install --no-cache-dir gunicorn

MATCHESSolution

maybe add KivyMD to the pip installs — You are probably missing dependencies. Tension: missing dependencies. Outcome: You are probably missing dependencies.

MATCHESSolution

Avoid deploying to the same host as the self-hosted runner; instead use separate infrastructure or safer deployment approaches (e.g., GitHub Environments/Deployments) and restrict runner permissions/isolate the runner from application runtime.

MATCHESSolution

Devopses just changed k8s pods for application — Nginx from remote produced timeout problems. Tension: nginx stopped closing the connection my app to remote. Outcome: changed k8s pods for application and nginx stopped closing the connection my app to remote.

MATCHESSolution

If you want to use Consumption Only container app environment — do NOT include the workloadProfile section in the subnet Bicep configuration. Tension: This means you don't need to add delegations.

MATCHESSolution

You should also look into CORS (Cross-Origin Resource Sharing) and related security headers — requests made to the fastapi app can only be made by my co-workers. Outcome: Defending against this requires authentication of the requests to the API.

MATCHESSolution

On your local machine, use your own credential directly — On your local machine, use your own credential directly. Tension: If you use your container locally, you can read my article to use your own credential in the local container runtime context.

MATCHESSolution

Use a newer runtime base image such as mcr.microsoft.com/dotnet/aspnet:6.0-alpine for the final stage

MATCHESSolution

you want a packaged + full trust app — Packaged apps may run virtualized/isolated in an AppContainer or as a full trust app. Tension: full trust app. Outcome: declare uap10:TrustLevel="mediumIL".

MATCHESSolution

You need to create Identity Tokens for Cloud Run authorization — For either option. Tension: A frontend written in react and hosted on firebase hosting and a backend written in python/FastAPI on cloud run. Outcome: You need to create Identity Tokens for Cloud Run authorization for either option.

MATCHESSolution

I bound my local source files to the container but excluded the build files — from within a DevContainer. Tension: hot reload started working correctly. Outcome: hot reload started working correctly.

MATCHESSolution

check the container logs — When working with Docker and Django it's quite common to get things into a state where the container keeps restarting / won't really start. Tension: This usually indicates a problem in Django and the logs shows us what's wrong with it. Outcome: one will get a more specific error.

MATCHESSolution

Summary: - Goal: Provide a concise, high-level view of TaskFlow's architecture — TaskFlow's architecture. Tension: help onboarding and future development. Outcome: Overall structure: A small Python monolith exposing both a CLI (Click) and a REST API (FastAPI) that share a common domain model and a SQLite persistence layer.

MATCHESSolution

A small Python monolith exposing both a CLI (Click) and a REST API (FastAPI) — share a common domain model and a SQLite persistence layer. Outcome: share a common domain model and a SQLite persistence layer.

MATCHESSolution

Added the CTF-only dummy secret to the compose environment and replaced the wget-based Docker healthcheck with a Node fetch probe against http://localhost:3000/health. Tension: the API served /health but Docker still reported unhealthy. Outcome: Recreated the API container after the compose changes.

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