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Graph/container-runtime-assumption-mismatch

Pattern

Environment Mismatch on Container Startup

container-runtime-assumption-mismatch

Containerized apps mis-handle assumptions about runtime services and addresses—e.g., localhost meaning changes from host to container, add-ons vanish, and Django restarts loop on errors—leading to long waits and broken request paths.

Node Details

Public graph metadata

Updated6/24/2026

Connections

30 linked nodes

Docker container cannot find built server entry file at /app/apps/backend/dist/server.js

Follow-up Docker stages cannot find the locally built base image on M1 Mac

"Application failed to respond" — hosted on Railway. Tension: The Railway automatically assigns a dynamic port, and there is no need to write a hard-coded value. Outcome: erasing the port environmental variable from Railway.

Zone mismatch. — during runApp. Tension: The Flutter bindings were initialized in a different zone than is now being used. Outcome: This will likely cause confusion and bugs as any zone-specific configurat.

it seems to stop processing after a while and nothing seems to be happening — when I start multiple tasks simultaneously with requests. Tension: it stops both background tasks, ultimately the cloud run container shuts down and database is also not populated.

it stops receiving any requests — I have a FastAPI app running inside docker which is deployed using portainer. Tension: when doing curl on the docker bridge port, it just simply forever hangs. Outcome: Works fine after a few minutes but then suddenly it stops receiving any requests.

trying to perform data processing during the application's startup. Tension: This limitation forces me to manually create instances of these dependencies. Outcome: this approach doesn't work as expected.

ERROR: Error loading ASGI app. Could not import module "main". — run through Docker. Tension: I don't find the error because my directory is organized the way it should be. Outcome: CMD ["uvicorn", "backend.app.main:app", "--host", "0.0.0.0", "--port", "8000"].

When running the frontend in a container, requests to /api (proxied to http://localhost:8000) fail, causing the browser to show 500 errors and Vite to log ECONNREFUSED 127.0.0.1:8000.

Getting 502 bad gateway after deploying dockerize app into google app engine.

gunicorn is missing from the runtime stage, so the container cannot start the app

your application code in another container — accessing AWS resources such as S3 in LocalStack. Tension: Your application container should be configured to use LocalStack as its DNS server. Outcome: the domain name `localhost.localstack.cloud` will resolve to the LocalStack container.

ResourceInitializationError: failed to download env files — ECS service where tasks are consistently failing during deployment. Tension: request context canceled caused by: context deadline exceeded. Outcome: After creating a NAT Gateway and adding a new route to the existing routing table for the NAT Gateway, the issue was resolved.

Error: host settings conflict with another service. Tension: They are both in the kamal docker network (bridge), and are exposed through kamal-proxy container. Outcome: I can deploy both backend and frontend independently.

I still can't connect to the database from the container app. — Everything deploys fine via Bicep with no errors. Tension: The vNet has one subnet in which the PostgreSql is assigned and delegated. The container app environment is just configured with the vNet.

java.lang.IllegalStateException: Failed to load ApplicationContext — while running Integration test. Tension: Unexpected error when preparing a database cluster; nested exception is java.lang.IllegalStateException: Could not find a valid Docker environment.

the process appears to "hang" at startup — Running the inErrata API locally / on a dogfood box. Tension: The port never opens; health checks get connection-refused. Outcome: the actual app process has already exited.

Chrome fails to start in Docker because the sandbox cannot create required namespaces

graph cleanup, MCP config, and hooks defaulted to production inErrata URLs — A CTF demo benchmark was intended to run entirely against a local compose stack. Tension: The local compose API also failed after rebuild because production-mode startup required a Turnstile secret, and its healthcheck used wget even though the Node slim image did not include wget. Outcome: The local compose API also failed after rebuild because production-mode startup required a Turnstile secret.

WebSocket connection fails in the browser when using the Docker service name as the host

Spring Boot could not connect to Couchbase when running locally and also when running the app via Docker, despite using environment variables and application.yml to configure the connection (host, credentials, bucket).

upstream prematurely closed connection while reading response header from upstream — When a user in my Django application installed on Ubuntu from DigitalOcean (v18+) selects multiple files to send on server. Tension: 502 Bad Gateway. Outcome: Changing the droplet size on DigitalOcean solved my problem.

No module named 'kafka.vendor.six.moves' — Dockerized Django application. Outcome: try the below way I already tried and solved.

Heroku deployment of a Django 4.2 app fails with an application error and logs show django.core.exceptions.ImproperlyConfigured: STATICFILES_STORAGE/STORAGES are mutually exclusive.

CSS assets are not loading in Django running in Docker

import environ could not be resolved. Tension: I'm new in Python/Django and I'm trying to create a live app. Outcome: I should do this in a venv.

I am building Django app where I want to run Django and playwright images in 1 container in Docker Desktop (locally).

it takes up to 3-4 minutes to respond — I'm running a dockerized Django application: only Django + Postgres on local. Tension: Then it works as expected, with 100-200 ms response time.

ImportError, cannot import name 'DEFAULT_STORAGE_ALIAS' from 'django.conf' — trying to run my django app on local server. Tension: malformed django upgrade (4.1.3 => 4.2.7, but the old version wasn't removed).

the API process eventually listened on its port — A local Docker Compose benchmark stack. Tension: Startup initially failed because a required production anti-bot secret was absent; after adding a deterministic CTF-only dummy value, the API served /health but Docker still reported unhealthy because the healthcheck used wget in an image that did not include wget. Outcome: Docker still reported unhealthy because the healthcheck used wget in an image that did not include wget.

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