Allow docker to utilize the complete CPUs and underlying RAM - linux

Question

Is there a way to specify the total RAM and total CPUs that a docker can use? My machine's size is 16 GB RAM and 4 CPUs. How can I make the docker-machine to utilize the complete RAM and underlying CPUs?
version: '3'
services:
prisma:
image: prismagraphql/prisma:1.34
restart: always
ports:
- "4466:4466"
environment:
JAVA_OPTS: '-Xmx8192m'
PRISMA_CONFIG: |
port: 4466
databases:
default:
connector: mongo
uri: 'mongodb+srv://abc:test#abc.net/default_default?retryWrites=true&w=majority'

Answer 1

What you are asking is the default behavior.
From docs
By default, a container has no resource constraints and can use as much of a given resource as the host’s kernel scheduler allows.
What you can do to ensure a container gets minimum amount of resources and is not at the mercy of scheduler is to use the resource reservations to ensure the container always has minimum required resources and optionally limits if you also want to enforce upper threshold for the resource usage.
See Resources section in docs
version: "3.8"
services:
redis:
image: redis:alpine
deploy:
resources:
limits:
cpus: '0.50'
memory: 50M
reservations:
cpus: '0.25'
memory: 20M
In this general example, the redis service is constrained to use no more than 50M of memory and 0.50 (50% of a single core) of available processing time (CPU), and has 20M of memory and 0.25 CPU time reserved (as always available to it).