How to assign more memory to docker container

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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:

Docker Preferences

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/#advanced

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

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