Docker Compose .env File Priority Ignoring System Environment Variables
When Docker Compose seems to ignore a system environment variable you've explicitly set, in favor of a value from a .env file, the behavior is usually correct...
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Docker Compose Service depends_on Starting Before Database Is Actually Ready
Plain depends_on in Docker Compose only guarantees a dependency container has started — not that the actual service inside it (like PostgreSQL) is finished...
Docker Container Keeps Restarting Continuously (CrashLoopBackOff)
A container stuck restarting continuously means the main process inside it crashes immediately every time it starts — the actual fix requires capturing the...
Docker Container Running Out of Disk Space Due to Unbounded Log Files
Docker's default logging driver doesn't rotate or limit log file size unless explicitly configured — a container that logs continuously (a common pattern for...
Docker Container Time Drift / Unsynced System Clock Fix
A Docker container's clock is normally the host's own system clock — containers don't maintain independent clocks the way full virtual machines do, so genuine...
Docker Permission Denied When Accessing Host USB or Serial Devices
A container failing to access a USB or serial device with a permission error usually means either the device wasn't explicitly passed into the container at...
Docker Volume Data Missing After Container Recreation
Data that seems to vanish after recreating a container almost always means the data was never actually stored in a persistent, correctly-referenced volume in...
API Response Leaking Sensitive Stack Trace in 500 Error Payload
An API returning a full stack trace, internal file paths, or raw database error details in its error responses is a real information disclosure issue — this...
CORS Header Access-Control-Allow-Origin Contains Multiple Values, Invalid Error
When a browser reports Access-Control-Allow-Origin contains multiple values, more than one layer in your request's path is independently adding this header —...