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}