Docker: how to enable swap limit capabilities

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You try to start your docker container with limits for memory and you get this warning:
Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.

At this point, I assume you have already cgroup working, CPU and RAM is limited and only swap is left.
These steps were done on Debian Buster.

1. Edit /etc/default/grub and update the entry GRUB_CMDLINE_LINUX as follows

root@candy:~# grep GRUB_CMDLINE_LINUX /etc/default/grub
GRUB_CMDLINE_LINUX="cgroup_enable=memory swapaccount=1"

2. Update grub

root@candy:~# update-grub
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.19.0-9-amd64
Found initrd image: /boot/initrd.img-4.19.0-9-amd64
done

3. Reboot

Now you should no more have that warning when starting docker container and will have swap limit.
Enjoy!

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