When I do docker info it gives me the following result:
OSType: linux
Architecture: x86_64
Number of Docker Hooks: 3
CPUs: 2
Total Memory: 7.632 GiB
but I want the cpu to be 1 and not 2.How do I restrict the CPU for the docker itself?
Limiting the docker daemon CPU resource
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3 Answers
On windows, open up powershell and type
# turn off all wsl instances such as docker-desktop
wsl --shutdown
notepad "$env:USERPROFILE/.wslconfig"
Edit .wslconfig file with notepad and write down these settings:
[wsl2]
memory=3GB # Limits VM memory in WSL 2 up to 3GB
processors=2 # Makes the WSL 2 VM use two virtual processors
type wsl in powershell
restart docker
type docker info and you should see something like
Architecture: x86_64
CPUs: 2
Total Memory: 6.789GiB
Credits to Ali Bahraminezhad, check out his post here
As specified in the docker documentation you can limit the container resources usage by specifying the --cpus flag when running.
The docker info command is returning the number of cpus on the machine.
To limit the container to use only one cpus use the following:
docker run --cpus="1" ...
Yo can limit resources to docker using docker machine. In other words you can limit resources assigned to virtual machine itself from your VM provider itself.
To create a new docker machine and specify its configurations:
docker-machine create -d virtualbox --virtualbox-memory=4096 --virtualbox-cpu-count=2 --virtualbox-disk-size=50000 nameOfYourMachine
To modify current one you can use VBoxManage that comes with Virtualbox, stop VM first, change settings and start it again.
docker-machine stop
VBoxManage modifyvm default --cpus 1
VBoxManage modifyvm default --memory 4096
docker-machine start
In Mac or windows where you have GUI, you can easily limit the docker resources CPU/memory from Preferences or Settings menu as shown below.
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