Linux tuning

configure_linux.yml

@@ -3,17 +3,13 @@
   user: root
 
   tasks:
-    - name: add script blob to disable THP on boot
-      blockinfile:
-        path: /etc/rc.local
-        insertbefore: "exit 0" 
-        block: |
-          if test -f /sys/kernel/mm/transparent_hugepage/enabled; then
-            echo never > /sys/kernel/mm/transparent_hugepage/enabled
-          fi
-          if test -f /sys/kernel/mm/transparent_hugepage/defrag; then
-            echo never > /sys/kernel/mm/transparent_hugepage/defrag
-          fi
+    - name: disable THP on boot via grub
+      lineinfile:
+        path: /etc/default/grub
+        regexp: '^GRUB_CMDLINE_LINUX_DEFAULT='
+        line: 'GRUB_CMDLINE_LINUX_DEFAULT="quiet splash transparent_hugepage=never"'
+      notify: update grub
+
     - name: set splunk ulimit fd
       blockinfile:
         path: /etc/security/limits.d/splunk.conf
@@ -22,4 +18,17 @@
           splunk        hard    nofile    65535
           splunk        soft    nofile    65535
 
+    - name: tell PAM to read limits
+      lineinfile:
+        path: /etc/pam.d/common-session
+        insertbefore: '# end of pam-auth-update config'
+        line: session required        pam_limits.so
 
+    - name: tell PAM to read limits non-interactive
+      lineinfile:
+        path: /etc/pam.d/common-session-noninteractive
+        insertbefore: '# end of pam-auth-update config'
+        line: session required        pam_limits.so
+  handlers:
+    - name: update grub
+      shell: /usr/sbin/update-grub