swap and sysctl tasks added

if swap not enabled, enable swap
set vm.swappiness and vm.vfs_cache_pressure on servers

roles/base/vars/main.yml

@@ -1,3 +1,2 @@
 rene_password:
-swappiness_value: 5
 root_home: "{{ lookup('env','HOME') }}"

roles/server/tasks/system_setup/swap.yml

@@ -0,0 +1,15 @@
+- block:
+  - name: server | system setup | create swapfile
+    command: "fallocate -l {{ ansible_facts['memtotal_mb'] / 4 | round }} /swapfile"
+  - name: server | system setup | format swapfile
+    filesystem:
+      fstype: swap
+      dev: "/swapfile" # required. Target path to device or image file.
+  - name: server | system setup | enable swap
+    command: "swapon /swapfile"
+  - name: server | system setup | edit fstab
+    lineinfile:
+      path: "/etc/fstab"
+      state: present
+      line: "/swapfile none swap sw 0 0"
+  when: ansible_facts['memory_mb']['swap']['total'] == '0'

roles/server/tasks/system_setup/sysctl.yml

@@ -0,0 +1,9 @@
+- name: server | system setup | sysctl
+  sysctl:
+    name: "{{ item.key }}"
+    value: "{{ item.value }}"
+    state: present
+    reload: yes
+  loop:
+    - { key: "vm.swappiness", value: "10"}
+    - { key: "vm.vfs_cache_pressure", value: "50"}

roles/server/vars/main.yml

@@ -0,0 +1 @@
+swappiness_value: 5