automatically setup swap partition, now with disk size detection

playbooks/tasks/cloudhost.yml

@@ -1,4 +1,7 @@
 ---
+- include: swap.yaml
+  when: mode == "pre"
+
 - name: Ensure base packages are up to date
   yum:
     name: '*'

playbooks/tasks/swap.yml

@@ -0,0 +1,34 @@
+---
+
+# try to find swap disk -- skip if it is already partitioned or not found
+- name: "Find swap disk"
+  set_fact:
+    swap_disk: "/dev/{{ item.key }}"
+  with_dict: "{{ ansible_devices }}"
+  when: "item.value.partitions|length == 0 and (item.value.size == '12.00 GB' or item.value.size == '6.00 GB')"
+
+# parted module doesn't support swap fs type, must use shell
+- name: "Partition swap disk"
+  shell: 'parted {{ swap_disk }} -s -- mklabel gpt mkpart "swap" linux-swap 1 -1'
+  when: swap_disk is defined
+  register: swappart
+
+- name: "Format swap partition"
+  shell: "mkswap {{ swap_disk }}1"
+  when: swap_disk is defined and swappart.rc == 0
+  register: swapFS
+
+- name: "Activate swap partition"
+  shell: "swapon {{ swap_disk }}1"
+  when: swap_disk is defined and swapFS.rc == 0
+
+- name: "Write swap entry to fstab"
+  mount:
+    name: none
+    src: "{{ swap_disk }}1"
+    fstype: swap
+    opts: defaults
+    passno: '0'
+    dump: '0'
+    state: present
+  when: swap_disk is defined and swapFS.rc == 0