[docker] WARNING: Your kernel does not support swap limit capabilities. Limitation discarded. WARNING: No memory limit support WARNING: No swap limit support 에러 해결하기

 데비안/우분투에서 다음과 같은 에러가 발생한다면 호스트의 설정을 변경해야 한다.

WARNING: Your kernel does not support swap limit capabilities. Limitation discarded.

WARNING: No memory limit support

WARNING: No swap limit support

참고 자료는 다음과 같다.

(호스트 머신의 재시작을 잊지 말자!)

https://docs.docker.com/install/linux/linux-postinstall/

Your kernel does not support cgroup swap limit capabilities

On Ubuntu or Debian hosts, You may see messages similar to the following when working with an image.

WARNING: Your kernel does not support swap limit capabilities. Limitation discarded.

This warning does not occur on RPM-based systems, which enable these capabilities by default.

If you don’t need these capabilities, you can ignore the warning. You can enable these capabilities on Ubuntu or Debian by following these instructions. Memory and swap accounting incur an overhead of about 1% of the total available memory and a 10% overall performance degradation, even if Docker is not running.

1. Log into the Ubuntu or Debian host as a user with sudo privileges.

2. Edit the /etc/default/grub file. Add or edit the GRUB_CMDLINE_LINUX line to add the following two key-value pairs:

   GRUB_CMDLINE_LINUX="cgroup_enable=memory swapaccount=1"
   

   Save and close the file.

3. Update GRUB.

   $ sudo update-grub
   

   If your GRUB configuration file has incorrect syntax, an error occurs. In this case, repeat steps 2 and 3.

   The changes take effect when the system is rebooted.