How to limit CPU usage of Docker build command?

Question

My Dockerfile executes RUN npm run build command. When I execute docker build command on t2.micro EC2 instance, instance freezes and does not respond (I cannot even connect with ssh). When I monitor the CPU usage, I can see that CPU usage reached to maximum level. Therefore, I have tried to limit memory usage with --max_semi_space_size=1 and --max_old_space_size=198 arguments but it did not work.

If I can set the CPU usage limit for the docker build command I think it might work. Can someone help me?

I'm aware that if I increase vCPU amount of the EC2 instance then I can build my application without any trouble but since it is a demo project I'm trying to deploy it on free tier.

Dockerfile:

FROM node:16-alpine
COPY . .
# Install dependencies
RUN node \
--max_semi_space_size=1 \
--max_old_space_size=198 \
$(which npm) ci
# Build the app
RUN node \
--max_semi_space_size=1 \
--max_old_space_size=198 \
$(which npm) run build
EXPOSE 3000
# Start the app
CMD [ "npx", "serve", "build" ]

Spinose

Answer 1

in your system, run sudo docker info. if you get WARNING: no swap limit support, you need to manually edit grub configuration first by running sudo nano /etc/default/grub and adding the following line: GRUB_CMDLINE_LINUX="cdgroup_enable=memory swapaccount=1" and saving .

limiting cpu can then be done. for commands on limiting memory and cpu you can check this article. limit cpu and memory usage in container

Cymene

Does limiting cpu usage in containers also limit cpu usage of the docker build process? (I mean without docker in docker) – Les