Adjust Docker Machine Memory & CPU

docker_adjust_memory.sh

# Adjust Docker Machine Memory+CPU 
# http://stackoverflow.com/questions/32834082/how-to-increase-docker-machine-memory-mac

docker-machine stop
VBoxManage modifyvm default --cpus 2
VBoxManage modifyvm default --memory 4096
docker-machine start

if from windows and VBoxManage is not in your ENV, specify the whole path in "Program Files"

docker-machine stop
/c/Program Files/Oracle/VirtualBox/VBoxManage modifyvm default --cpus 4
/c/Program Files/Oracle/VirtualBox/VBoxManage modifyvm default --memory 4096
docker-machine start

It will not reflect immediately if you print the config docker-machine inspect, but it will be shown when you do the below or modify the config.json of the docker-machine itself

$ docker exec -ti container-instance-name /bin/bash
root@abcd1234:/# cat /proc/cpuinfo

If creating a new docker-machine vm, the defaults can also be overridden at creation:

docker-machine create -d virtualbox --virtualbox-cpu-count=2 --virtualbox-memory=4096 default