metron-deployment/roles/fastcapa/tasks/kernel.yml

#
#  Licensed to the Apache Software Foundation (ASF) under one or more
#  contributor license agreements.  See the NOTICE file distributed with
#  this work for additional information regarding copyright ownership.
#  The ASF licenses this file to You under the Apache License, Version 2.0
#  (the "License"); you may not use this file except in compliance with
#  the License.  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.
#
#
# DPDK requires specific kernel boot parameters.  set the params and reboot
# the host, if the actual params differ from what is expected.
#
---
  - set_fact:
      expected_kernel_params: "default_hugepagesz=1G hugepagesz=1G hugepages={{ num_huge_pages }} iommu=pt intel_iommu=on"

  - name: Check kernel boot parameters
    shell: "cat /proc/cmdline"
    register: actual_kernel_params

  - name: Alter kernel boot parameters
    lineinfile:
      dest: /etc/default/grub
      regexp:  '^(GRUB_CMDLINE_LINUX=\"[^\"]+)\"$'
      line: '\1 {{ expected_kernel_params }}"'
      backrefs: yes
    when: not expected_kernel_params in actual_kernel_params.stdout

  - name: Update grub with kernel boot parameters
    shell: /sbin/grub2-mkconfig -o /boot/grub2/grub.cfg
    when: not expected_kernel_params in actual_kernel_params.stdout

  - name: Restart for modified kernel params
    command: shutdown -r now "modified kernel params"
    async: 0
    poll: 0
    ignore_errors: true
    when: not expected_kernel_params in actual_kernel_params.stdout
    
  - name: Wait for reboot of '{{ inventory_hostname }}'
    local_action: wait_for host={{ inventory_hostname }} state=started port=22 timeout=300 delay=10
    become: false
    when: not expected_kernel_params in actual_kernel_params.stdout