Swarmkit notes (--SWARMCTL) specify resource limits when creating a service

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swarmctlserviceyou can specify CPU and resource limits when you create memory :

# swarmctl service create --helpCreate a serviceUsage:  swarmctl service create [flags]Flags:......  --cpu-limit string            CPU cores limit (e.g. 0.5)  --cpu-reservation string      number of CPU cores reserved (e.g. 0.5)......  --memory-limit string         memory limit (e.g. 512m)  --memory-reservation string   amount of reserved memory (e.g. 512m)    ......

*-reservationThe role is to container allocate and "Occupy" the corresponding resources, so these resources are container necessarily available, *-limit is to limit the container resources used by the process. The code that parses the resource is located in the cmd/swarmctl/service/flagparser/resource.go file.

Resources:
Docker Service Limits and reservations.