We built a new image layer for our Python deployment. Every time we attempt to run it, the initializes for a fraction of a second and then shuts down with exit code 1. No detailed error log is dumped to standard output. What steps should we take to find the issue?
3 answers
Exit code 1 is a generic catch-all indicator signifying that the application process within your encountered a fatal runtime error or configuration defect during startup. This often stems from missing environment variables, missing package dependencies, syntax syntax errors in code execution, or an invalid file path definition in your application configuration files. Since the application fails before the logging framework initializes, you should try running the container interactively with a shell override like /bin/sh to manually inspect the filesystem state.
Overriding the command flag to launch an interactive shell is a solid debugging tactic, but how do we catch these hidden configuration bugs earlier if the is crashing within an automated remote Kubernetes cluster where manual shell access is blocked?
It simply means an application-level error occurred during the boot phase, resulting in a standard non-zero failure exit return.
I completely agree with Jeanette. Exit code 1 is rarely a Docker system bug; it is almost always your internal application code telling you that something is wrong.
For remote automated orchestrators, you should rely on the kubectl logs --previous command. This special execution fetches the standard error output stream from the dead instance before it was purged, helping you spot the missing runtime modules.