How to troubleshoot exit code 1 in Docker

Troubleshooting exit code 1 in Docker

• Introduction to exit code 1 in Docker:

  • Exit code 1 indicates a process failure in Docker container.
  • Common reasons for exit code 1 include process execution failure, missing dependencies, incorrect entry points, resource constraints, network issues, and permission problems.

• Reproducing the error:

  • When executing a script in a Docker container that explicitly exits with code 1, the error will be displayed.

• Troubleshooting exit code 1:

  • Look for error messages, stack traces, missing files or dependencies, and permission errors.
  • Check the ENTRYPOINT or CMD directives in the Dockerfile.
  • Ensure all dependencies are installed and environment variables are correctly specified.
  • Inspect the container's filesystem using docker exec -it [container_id] sh.

• Solutions:

  • Fixing application errors: Log at different levels, handle exceptions, check environment variables.
  • Debugging failed dependencies: Interact with the container to identify and fix issues.
  • Restart policies: Configure restart policies in Docker Compose to handle container failures.

• Conclusion:

  • Understanding the causes of exit code 1 errors and implementing solutions can streamline development and deployment processes in Docker containers.