Enabling swap accounting for Docker

This document (7016754) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise Server 12 Service Pack 2
SUSE Linux Enterprise Server 12 Service Pack 3
SUSE Linux Enterprise Server 12 Service Pack 4
SUSE Linux Enterprise Server 12 Service Pack 5
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server 15 Service Pack 1
SUSE Linux Enterprise Server 15 Service Pack 2
SUSE Linux Enterprise Server 15 Service Pack 3

Situation

The following warning may be generated when the Docker host kernel does not take swap accounting into consideration:

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

Resolution

To remove this warning message perform the following steps:
  • Start YaST, and select System > Boot Loader
  • Click 'Kernel Parameters'
  • Enter the following strings inside of the “Optional Kernel Command Line Parameter”:
    swapaccount=1
  • Press the OK button
  • Reboot your machine

Alternatively:

  • edit the /etc/default/grub file
  • Add the following string inside of the GRUB_CMDLINE_LINUX_DEFAULT variable:
    swapaccount=1
  • Save the change
  • Run: “sudo update-bootloader –refresh”
  • Reboot your machine

Additional Information

The swap warnings are not seen on SLES15 SP4

Cgroups v2 are supported starting with SLES15 SP2

Disclaimer

This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:7016754
  • Creation Date: 11-Aug-2015
  • Modified Date:04-Apr-2023
    • SUSE Linux Enterprise Server

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