I am new to Docker, and trying to go through this tutorial setting up MemSQL from a Docker image - http://docs.memsql.com/4.0/setup/docker/ . I am on a Mac, and the tutorial uses boot2docker which seems to have been deprecated.
The VM needs 4GB memory to run. The tutorial specifies how to do this with boot2docker but I cannot find a way to do this with the docker-machine/docker toolbox.
Here is the command I am using and the error I am getting just trying to go through the tutorial without altering the boot2docker config.
docker run --rm --net=host memsql/quickstart check-system
Error: MemSQL requires at least 4 GB of memory to run.
when you create docker machine, you can nominate the memory size:
docker-machine create -d virtualbox --virtualbox-memory 4096 default
Let me know if this helps.
You can do this via the command line. For example, to change the machine from the default 1cpu/2048MB RAM run:
docker-machine stop
VBoxManage modifyvm default --cpus 2
VBoxManage modifyvm default --memory 4096
docker-machine start
For Docker version 1.12.1 (build: 12133) and higher on macOS there is an option to change CPU's and RAM from UI and restart docker. You can find the preferences from toolbar. Attaching images for clarity.
Steps: Preferences -> Advanced -> adjust resources -> Apply & Restart
Docker Machine maintainer here. I don't think adjusting the config.json manually will work.
Your two options are to either create the machine with --virtualbox-memory set, or to adjust the VM's memory in the VirtualBox GUI ("Settings > System" for that VM I think). Make sure the machine is powered off and there should be a little slider that works.
EDIT: Another answer shows that you can do the in-place operation from the command line as well using VBoxManage.
I couldn't get the other answers to work. The only thing that worked for me was to remove the default machine and re-create it with more memory.
docker-machine rm default
docker-machine create -d virtualbox --virtualbox-memory=4096 --virtualbox-cpu-count=2 --virtualbox-disk-size=50000 default
This fix was found here: https://www.ibm.com/developerworks/community/blogs/jfp/entry/Using_Docker_Machine_On_Windows?lang=en
Other answers showed how to change the memory using VBoxManage:
docker-machine stop default
VBoxManage modifyvm default --memory 4096
docker-machine start default
To confirm the change from the command line:
VBoxManage showvminfo default | grep Memory
OR
docker-machine ssh default free
fox xhyve (another virtualization under macos) you can modify ~/.docker/machine/default/config.json property Driver/Memory (default to 1024) then restart docker machine to apply changes
来源：https://stackoverflow.com/questions/32834082/how-to-increase-docker-machine-memory-mac