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Cgroup one of the needed subsystems is not mounted

cn flag

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.

ec flag
**Welcome to the Ask Ubuntu community.** So it will be easier to diagnose your issue, please edit your question to include the version of the Ubuntu OS that you're running.
shantanu sharma avatar
cn flag
I'm running Ubuntu **22.04.2 LTS** with **5.19.0-41-generic** Kernel.
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