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CPUs limits

By default, each container’s access to the host machine’s CPUs is unlimited. You can set various constraints to limit a given container’s access to the host machine’s CPUs.

Prerequisites

Having completed lab 00 - Setup lab environment

Connect to Sunnyvale's Ubuntu VM

$ cd <GIT_REPO_NAME>/vagrant
$ vagrant up
$ vagrant ssh
vagrant@docker-vm:~$

Use Docler CPUs limits

Get the Docker Host (Ubuntu VM in this case) total CPUs available:

vagrant@docker-vm:~$ cat /proc/cpuinfo | grep processor | wc -l 
2

Run a container to test the Max CPUs seen by a Java application

vagrant@docker-vm:~$ docker run \
    --rm \
    -v $(pwd)/app:/app/ \
    openjdk:11.0-jdk \
    /usr/local/openjdk-11/bin/java \
    /app/MaxProcessors.java
Max Processors: 2

Run a container with `--cpus 1 flag (1/2 of the host's CPUs)

vagrant@docker-vm:~$ docker run \
    --rm \
    --cpus 1 \
    -v $(pwd)/app:/app/ \
    openjdk:11.0-jdk \
    /usr/local/openjdk-11/bin/java \
    /app/MaxProcessors.java
Max Processors: 1