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heat_template_version: 2014-10-16
description: >
This is an example showing how you can do firstboot configuration
of the nodes via cloud-init. To enable this, replace the default
mapping of OS::TripleO::NodeUserData in ../overcloud_resource_registry*
parameters:
ComputeKernelArgs:
description: >
Space seprated list of Kernel args to be update to grub.
The given args will be appended to existing args of GRUB_CMDLINE_LINUX in file /etc/default/grub
Example: "intel_iommu=on default_hugepagesz=2MB hugepagesz=2MB hugepages=2048"
type: string
default: ""
resources:
userdata:
type: OS::Heat::MultipartMime
properties:
parts:
- config: {get_resource: compute_kernel_args}
# Verify the logs on /var/log/cloud-init.log on the overcloud node
compute_kernel_args:
type: OS::Heat::SoftwareConfig
properties:
config:
str_replace:
template: |
#!/bin/bash
set -x
sed 's/^\(GRUB_CMDLINE_LINUX=".*\)"/\1 $KERNEL_ARGS"/g' -i /etc/default/grub ;
grub2-mkconfig -o /etc/grub2.cfg
hugepage_count=`echo $KERNEL_ARGS | grep -oP ' ?hugepages=\K[0-9]+'`
if [ -z "$hugepage_count" ]; then
hugepage_count=1024
fi
echo vm.hugetlb_shm_group=0 >> /usr/lib/sysctl.d/00-system.conf
echo vm.max_map_count=$(printf "%.0f" $(echo 2.2*$hugepage_count | bc)) >> /usr/lib/sysctl.d/00-system.conf
echo kernel.shmmax=$(($hugepage_count * 2 * 1024 * 1024)) >> /usr/lib/sysctl.d/00-system.conf
reboot
params:
$KERNEL_ARGS: {get_param: ComputeKernelArgs}
outputs:
# This means get_resource from the parent template will get the userdata, see:
# http://docs.openstack.org/developer/heat/template_guide/composition.html#making-your-template-resource-more-transparent
# Note this is new-for-kilo, an alternative is returning a value then using
# get_attr in the parent template instead.
OS::stack_id:
value: {get_resource: userdata}
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