playbooks/roles/configure-targethosts/tasks/create-swap.yml

---
# ============LICENSE_START=======================================================
#  Copyright (C) 2019 The Nordix Foundation. All rights reserved.
# ================================================================================
# Licensed 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.
#
# SPDX-License-Identifier: Apache-2.0
# ============LICENSE_END=========================================================
# TODO: Sometimes mariadb gets stuck in a restart loop for lack of main memory,
# using a swap file seems to solve the problem.

- name: Check for swap file
  stat:
    path: /swapfile
  register: swap

- block:
    - name: Create swap file
      command: "fallocate -l 4096M /swapfile"
      args:
        creates: /swapfile

    - name: Set swap file permissions
      file:
        path: /swapfile
        state: "file"
        owner: "root"
        group: "root"
        mode: "0600"

    - name: Initialize swap file
      command: "mkswap /swapfile"
      changed_when: false

    - name: Enable swap file
      command: "swapon /swapfile"
      changed_when: false

    - name: Manage swap file in /etc/fstab
      mount:
        src: /swapfile
        name: "none"
        fstype: "swap"
        opts: "sw,nofail"
        dump: "0"
        passno: "0"
        state: present
  when: not swap.stat.exists

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