Docker deployment for tohtori and some refactoring

roles/base/tasks/swapfile.yml

@@ -0,0 +1,37 @@
+---
+- name: Write swapfile
+  command: |
+    {% if swapfile_use_dd %}
+    dd if=/dev/zero of=/swapfile bs=1M count={{ swapfile_size }} creates=/swapfile
+    {% else %}
+    fallocate -l {{ swapfile_size }} /swapfile creates=/swapfile
+    {% endif %}
+  register: write_swapfile
+  when: swapfile_size != false
+
+- name: Set swapfile permissions
+  file: path=/swapfile mode=600
+  when: swapfile_size != false
+
+- name: Create swapfile
+  command: mkswap /swapfile
+  register: create_swapfile
+  when: swapfile_size != false and write_swapfile.changed
+
+- name: Enable swapfile
+  command: swapon /swapfile
+  when: swapfile_size != false and create_swapfile.changed
+
+- name: Add swapfile to /etc/fstab
+  lineinfile: dest=/etc/fstab line="/swapfile   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