What is the default memory limit for a container

Open Source Projects DockerEngine
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Like the subject says, what is the default memory limit of a docker container with no memory limit specified on docker run?

Kind regards, Martin

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The default is “unlimited”, aka whatever the OS gives it.

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Is there a way to limit the memory usage?

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or mem_limit in docker-compose

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This is no longer true, Mac’s seem to have a 2 GB limit. And Windows has some limit. These limits have broken our solutions and lead to hours of debugging.

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Probably because on Mac and Windows, docker is virtualized, no?