How to assign more memory to docker container

Question

As the title reads  I m trying to assign more memory to my container  I m using an image from docker hub called  aallam tomcat-mysql  in case that s relevant   When I start it normally without any special flags  there s a memory limit of 2GB  even though I read that memory is unbounded if not set   Here are my docker stats  CONTAINER           CPU                 MEM USAGE   LIMIT       MEM                 NET I O             BLOCK I O           PIDS ba57d6c9e9d2        0 22                145 6 MiB   1 952 GiB   7 29                508 B   508 B       0 B   6 91 MB       68   I tried setting memory explicitly like so but with same results  docker run -d --memory 10g --memory-swap -1 -e MYSQL PASSWORD password -p 3307 3306 -p 8081 8080 aallam tomcat-mysql   I ve read that perhaps the VM is what s restricting it  But then why does docker stats show that container size limit is 2GB

User · Answer

Allocate maximum memory to your docker machine from (docker preference -> advance )

Screenshot of advance settings:

This will set the maximum limit docker consume while running containers. Now run your image in new container with -m=4g flag for 4 gigs ram or more. e.g.

docker run -m=4g {imageID}

Remember to apply the ram limit increase changes. Restart the docker and double check that ram limit did increased. This can be one of the factor you not see the ram limit increase in docker containers.

User · Answer

If you want to change the default container and you are using Virtualbox  you can do it via the commandline   CLI   docker-machine stop VBoxManage modifyvm default --cpus 2 VBoxManage modifyvm default --memory 4096 docker-machine start

User · Answer

That 2GB limit you see is the total memory of the VM in which docker runs   If you are using docker-for-windows or docker-for-mac you can easily increase it from the Whale  icon in the task bar  then go to Preferences -  Advanced     But if you are using VirtualBox behind  open VirtualBox  Select and configure the docker-machine assigned memory   See this for Mac    https   docs docker com docker-for-mac  memory     MEMORY   By default  Docker for Mac is set to use 2 GB runtime memory  allocated from the total available memory on your Mac  You can increase the RAM on the app to get faster performance by setting this number higher  for example to 3  or lower  to 1  if you want Docker for Mac to use less memory    For Windows    https   docs docker com docker-for-windows  advanced     Memory - Change the amount of memory the Docker for Windows Linux VM uses

[docker] How to assign more memory to docker container

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