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Memory limits on container

Ubuntu

Since docker container as no memory limit by default, if something goes south, your node could take all of your host memory resources for itself. Adding memory limits on your container should help prevent that your container brings your host system down.

Docker uses cgroups to limit memory resources.

First, you can check if your system support cgroup memory and swap accounting by running the following command:

docker info

If you can see one or all of the following notice at the output ends, it means that some cgroups behaviors are missing on your system:

WARNING: No memory limit support
WARNING: No swap limit support
WARNING: No kernel memory limit support
WARNING: No kernel memory TCP limit support
WARNING: No oom kill disable support

Boot with "cgroups" Memory accounting

On most system, you'll add the following line in your /etc/default/grub file:

GRUB_CMDLINE_LINUX_DEFAULT="cgroup_enable=memory cgroup_memory=1 swapaccount=1"

If you're running on Raspberry Pi, add the following at the end of your /boot/firmware/cmdline.txt file:

cgroup_enable=memory cgroup_memory=1 swapaccount=1

** NOTE: The cmdline.txt file MUST contain only one line.