wiki/docs/Docker/resource.limits.md

Resource limits

You can limit the amount of CPU and/or memory resources that a container can use.

CPU

Option	Description
--cpus	Set number of CPUs thee container can use
--cpu-period	Limits the length of time it can schedule the CPU before being throttled (used alongside --cpu-quota)
--cpu-quota	The throttling setting activated when the CPU is scheduled longer than --cpu-period
--cpuset-cpus	Limit the container to specific CPUs or cores (e.g. 0-3, 0,1)
--cpu-shares	The number of relative shares of the CPU the container can use (default 1024)

Memory

A markdown table:

Option	Description
-m or --memory	Memory limit (minimum 6m (megabytes))
--memory-swap	How much swap is available - details
--memory-swappiness	"By default, the host kernel can swap out a percentage of anonymous pages used by a container. You can set --memory-swappiness to a value between 0 and 100, to tune this percentage" - details
--memory-reservation	Soft limit less than --memory (for when there is low memory on host), soft limit, so usage may exceed this.
--oom-kill-disable	Disable OOM Killer (stops from killing container processes when out-of-memory error occurs) - Make sure to use -m, or host processes could be killed

Example

Note: --xxxx 4 in docker run would be replaced with xxxx in docker-compose.yml. See below:

service:
  image: nginx
  mem_limit: 512m
  mem_reservation: 128M
  cpus: 0.5
  ports:
    - "80:80"

See also

• Docker documentation
• Baeldung docs (includes docker compose examples)