Most of us have been in the position where you want to run docker in Raspberry Pi and create a docker swarm cluster or Kubernetes cluster. When it comes to docker installation, docker info command gives you warning messages, hence the cluster installation gets stuck.

docker info

Throws 0ne of the following warnings or all of them

WARNING: No memory limit support
WARNING: No swap limit support
WARNING: No kernel memory limit support
WARNING: No oom kill disable support
WARNING: No cpu cfs quota support
WARNING: No cpu cfs period support

Enable cgroups

To enforce limits to the containers, it is required that cgroup is enabled. So the kernel needs to boot up with cgroup support.

In Raspberry Pi running Ubuntu Server 64 Bit , add the following content to /boot/firmware/cmdline.txt

nano /boot/firmware/cmdline.txt

cgroup_enable=memory swapaccount=1 cgroup_memory=1 cgroup_enable=cpuset

Save the file with ctrl+o, ctrl+x, Enter.

Reboot System

To load these new configurations, reboot the system

sudo reboot now

After reboot, the docker info command should not show any warning messages.

Enjoy!