add task to create swap

This is mostly useful in AWS where swap does not exist and must be created manualy.

tasks/swap.yml

@@ -0,0 +1,56 @@
+# use variables:
+#   swap_file_size_mb
+#   swap_file_path
+
+- name: Create swap file
+  command:
+    cmd: "dd if=/dev/zero of={{ swap_file_path }} bs=1024 count={{ swap_file_size_mb }}k"
+    creates: "{{ swap_file_path }}"
+  tags:
+    - swap.file.create
+    - swap
+
+
+- name: Change swap file permissions
+  file: path="{{ swap_file_path }}"
+        owner=root
+        group=root
+        mode=0600
+  tags:
+    - swap.file.permissions
+    - swap
+
+- name: Check swap file type
+  command: file {{ swap_file_path }}
+  register: swapfile
+  tags:
+    - swap.file.mkswap
+    - swap
+
+- name: Make swap file
+  filesystem:
+    fstype: swap
+    dev: "{{ swap_file_path }}"
+  when: swapfile.stdout.find('swap file') == -1
+  tags:
+    - swap.file.mkswap
+    - swap
+
+- name: Write swap entry in fstab
+  mount: path=none
+         src={{ swap_file_path }}
+         fstype=swap
+         opts=sw
+         passno=0
+         dump=0
+         state=present
+  tags:
+    - swap.fstab
+    - swap
+
+- name: Mount swap
+  command: "swapon {{ swap_file_path }}"
+  when: ansible_swaptotal_mb < 1
+  tags:
+    - swap.file.swapon
+    - swap