Add possibility to change ulimit for Apache

cf. https://wiki.evolix.org/HowtoApache#too-many-open-files

apache/defaults/main.yml

@@ -14,6 +14,10 @@ apache_evolinux_default_ssl_key: /etc/ssl/private/ssl-cert-snakeoil.key
 apache_serverstatus_suffix: ""
 apache_serverstatus_suffix_file: "/etc/evolinux/apache_serverstatus_suffix"
 
+# Change Apache's ulimit through APACHE_ULIMIT_MAX_FILES
+apache_change_ulimit: True
+apache_ulimit_max: '65536'
+
 apache_log2mail_include: True
 apache_munin_include: True
 

apache/tasks/main.yml

@@ -137,6 +137,16 @@
   tags:
     - apache
 
+- name: Add line in envvars for ulimit
+  lineinfile:
+    path: /etc/apache2/envvars
+    regexp: '^#?APACHE_ULIMIT_MAX_FILES='
+    line: "APACHE_ULIMIT_MAX_FILES='ulimit -n {{ apache_ulimit_max }}'"
+  when: apache_change_ulimit
+  notify: 'restart apache'
+  tags:
+    - apache
+
 - include_role:
     name: evolix/remount-usr
   tags: