Could you explain the role and purpose of Supervisor in the context of Docker?

Supervisor in the context of Docker usually refers to a process or service that manages the launching and monitoring of other processes inside a container. Since Docker containers by default run a single main process, using Supervisor allows for running and controlling multiple processes within one container.

Role and purpose of Supervisor:

• Running multiple services within one container.
• Automatic restart of crashed processes.
• Centralized logging and process management.

For example, if a container needs to run a web server and a database simultaneously, Supervisor can control both processes, ensuring their stable operation.

Often, supervisord is used — a daemon that reads configuration and manages processes.

However, modern practices recommend running a single process per container and using orchestrators (like Kubernetes) to manage multiple containers, each responsible for a separate service.