I'm a web application developer. I am learning about container internals and Linux.
I was following the article Complete Intro to Containers. When I ran the command cgcreate -g cpu,memory,blkio,devices,freezer:./sandbox inside the container, it didn't work. I also tried the same command outside the running docker container but no difference in Error.
The error is cgcreate: can't create cgroup ./sandbox: Cgroup one of the needed subsystems is not mounted.
I saw some online solutions where certain flags are used in grub configurations. But I want to know the reason for the error and how can we resolve this. I assume that applications like Docker might also use the same underlying implementations to get the desired result.
EDIT1: I'm running Ubuntu 22.04.2 LTS with 5.19.0-41-generic Kernel.
