What is the difference between a resource limit and a resource reservation when scheduling services?

Resource limits and reservations are distinct concepts with different operational purposes and are not interchangeable in Docker Swarm scheduling.

This statement incorrectly defines limits as soft and reservations as hard; limits are typically hard caps on consumption, while reservations are guarantees for scheduling.

This option incorrectly merges parts of both definitions and mischaracterizes the nature of a resource limit in the context of scheduling.

A resource limit specifies the maximum amount of a resource (like CPU or memory) that a container can consume; if it tries to exceed this, it may be throttled or terminated. Conversely, a resource reservation defines the minimum guaranteed amount of a resource for the container and is primarily used by the Docker Swarm scheduler to find a host with adequate available resources to place the service.