Add optional swap role that configures a swapfile

playbooks/edx_sandbox.yml

@@ -51,6 +51,7 @@
       when: ENABLE_LEGACY_ORA
     - certs
     - edx_ansible
+    - { role: swapfile, SWAPFILE_SIZE: "2GB" }
     - role: datadog
       when: COMMON_ENABLE_DATADOG
     - role: splunkforwarder

playbooks/roles/swapfile/LICENSE

+The MIT License (MIT)
+
+Copyright (c) 2014 Kamal Nasser <hello@kamal.io>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

playbooks/roles/swapfile/README.md

+swapfile
+========
+
+Creates and enables a swap file.
+
+Slightly modified from https://github.com/kamaln7/ansible-swapfile
+
+## License
+
+The MIT License (MIT)
+
+Copyright (c) 2014 Kamal Nasser <hello@kamal.io>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

playbooks/roles/swapfile/defaults/main.yml

+---
+# To enable the swapfile role, set this variable using a MB or GB suffix
+# e.g. SWAPFILE_SIZE: 512MB
+# To disable the role, leave the default value of 'false'
+SWAPFILE_SIZE: false
+
+
+swapfile_location: /swapfile
+swapfile_swappiness: False
+swapfile_vfs_cache_pressure: False
+swapfile_use_dd: False

playbooks/roles/swapfile/handlers/main.yml

+---
+- name: reload sysctl
+  command: sysctl -p

playbooks/roles/swapfile/meta/main.yml

+---
+galaxy_info:
+  author: "Kamal Nasser"
+  description: swapfile
+  license: MIT
+  min_ansible_version: 1.4
+  version: 0.4
+  categories:
+    - system
+  dependencies: []

playbooks/roles/swapfile/tasks/main.yml

+---
+- name: Write swapfile
+  command: |
+    {% if swapfile_use_dd %}
+    dd if=/dev/zero of={{ swapfile_location }} bs=1M count={{ SWAPFILE_SIZE }} creates={{ swapfile_location }}
+    {% else %}
+    fallocate -l {{ SWAPFILE_SIZE }} {{ swapfile_location }} creates={{ swapfile_location }}
+    {% endif %}
+  register: write_swapfile
+  when: SWAPFILE_SIZE != false
+
+- name: Set swapfile permissions
+  file: path={{ swapfile_location }} mode=600
+  when: SWAPFILE_SIZE != false
+
+- name: Create swapfile
+  command: mkswap {{ swapfile_location }}
+  register: create_swapfile
+  when: SWAPFILE_SIZE != false and write_swapfile.changed
+
+- name: Enable swapfile
+  command: swapon {{ swapfile_location }}
+  when: SWAPFILE_SIZE != false and create_swapfile.changed
+
+- name: Add swapfile to /etc/fstab
+  lineinfile: dest=/etc/fstab line="{{ swapfile_location }}   none    swap    sw    0   0" state=present
+  when: SWAPFILE_SIZE != false
+
+- name: Configure vm.swappiness
+  lineinfile: dest=/etc/sysctl.conf line="vm.swappiness = {{ swapfile_swappiness }}" regexp="^vm.swappiness[\s]?=" state=present
+  notify: reload sysctl
+  when: swapfile_swappiness != false
+
+- name: Configure vm.vfs_cache_pressure
+  lineinfile: dest=/etc/sysctl.conf line="vm.vfs_cache_pressure = {{ swapfile_vfs_cache_pressure }}" regexp="^vm.vfs_cache_pressure[\s]?=" state=present
+  notify: reload sysctl
+  when: swapfile_vfs_cache_pressure != false