What difficulties may arise when running an application and a database in the same Docker container?

Running an application and a database in a single Docker container can lead to several issues:

• Management complexity: Containers are better used for a single process. Running multiple processes together complicates monitoring, restarting, and scaling.
• Scalability: If you need to scale only the application or only the database, it becomes impossible without separation.
• Updates and deployment: Updating one component requires rebuilding and restarting the entire container.
• Isolation: A failure or error in the database can affect the application and vice versa.
• Logging and monitoring: Mixed logs and metrics make diagnostics more difficult.

Therefore, it is recommended to run the application and database in separate containers, using Docker Compose or Kubernetes for orchestration.