Grub¶

Name	`debops.grub`
Repository	https://github.com/debops/debops
Documentation	https://docs.debops.org/en/master/ansible/roles/grub/defaults/main.html#grub-configuration-options

Blacklist a module¶

##########################
# grub

grub__default_configuration:
  - name: 'cmdline_linux_default'
      value:
        - modprobe.blacklist=qla2xxx

Disable predictable network interface names¶

##########################
# grub

grub__default_configuration:
  - name: 'cmdline_linux_default'
      value:
        - net.ifnames=0
        - biosdevname=0

Enable IOMMU¶

Intel¶

##########################
# grub

grub__default_configuration:
  - name: 'cmdline_linux_default'
      value:
        - intel_iommu=on
        - iommu=pt

AMD¶

##########################
# grub

grub__default_configuration:
  - name: 'cmdline_linux_default'
      value:
        - iommu=pt

Support of Docker capabilities¶

Note

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.

$ docker info
[...]
WARNING: No swap limit support

This is actual the default in debops grub https://github.com/debops/debops/blob/master/ansible/roles/grub/defaults/main.yml#L138

##########################
# grub

grub__default_configuration:
  - name: 'cmdline_linux_default'
      value:
        - cgroup_enable=memory
        - swapaccount=1