Docker Environment Variables Not Loading From .env File
When environment variables from a .env file don't show up inside a container, the cause is usually a mismatch between what actually reads that file (Docker...
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Docker Healthcheck Always Showing Unhealthy
A container marked "unhealthy" by Docker despite the application clearly working when tested manually almost always means the healthcheck command itself is...
Docker Image Size Too Large, How to Reduce It
A bloated Docker image isn't usually caused by your application code — it's almost always the base image choice, unnecessary build tools left in the final...
Docker Multi-Stage Build Not Copying Files Correctly
When files that clearly exist in an earlier build stage don't show up in the final image after a COPY --from, the cause is almost always a mismatch between the...
Docker "No Space Left on Device" Error Fix
Docker's "no space left on device" error almost always means Docker's own storage — accumulated images, stopped containers, unused volumes, and build cache —...
Nginx 502 Bad Gateway With Docker Container
A 502 Bad Gateway from Nginx in a Docker setup almost always means Nginx successfully received the request but couldn't get a valid response from the upstream...
How to Reset PostgreSQL Password Inside Docker Container
Resetting a PostgreSQL password inside a Docker container is a bit different from a normal installation, because you're working through docker exec rather than...
Postgres Connection Refused Inside Docker Network
A "connection refused" error between two containers on the same Docker network almost always means the PostgreSQL container isn't reachable yet, isn't...
Docker Build Cache Not Invalidating After File Change
If you change a file in your project but docker build keeps producing an image with the old content, Docker isn't actually ignoring your change — it's reusing...