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}