archwiki: add apcu caching to the archwiki

With apcu caching the wiki get's ~ 40 req/s more and the latency of the
wiki lowers.

playbooks/apollo.yml

@@ -41,7 +41,7 @@
               mariadb_innodb_file_per_table: True, tags: ["mariadb"] }
     - { role: sudo, tags: ['sudo'] }
     - { role: uwsgi, tags: ['uwsgi'] }
-    - { role: php-fpm, php_extensions: ['bcmath', 'curl', 'gd', 'iconv', 'intl', 'mysqli', 'pdo_pgsql', 'pgsql', 'sockets', 'zip'], zend_extensions: ['opcache'], tags: ["php-fpm"] }
+    - { role: php-fpm, php_extensions: ['apcu', 'bcmath', 'curl', 'gd', 'iconv', 'intl', 'mysqli', 'pdo_pgsql', 'pgsql', 'sockets', 'zip'], zend_extensions: ['opcache'], tags: ["php-fpm"] }
     - { role: memcached, tags: ['memcached'] }
     - { role: archweb, tags: ["archweb"] }
     - { role: security_tracker, security_tracker_domain: "security.archlinux.org", security_tracker_dir: "/srv/http/security-tracker", tags: ["security_tracker"] }

roles/archwiki/files/20-apcu.ini

+apc.shm_size = 512M

roles/archwiki/tasks/main.yml

@@ -5,7 +5,7 @@
   when: 'archwiki_domain is defined'
 
 - name: install packages
-  pacman: name=git,php-intl state=present
+  pacman: name=git,php-intl,php-apcu state=present
 
 - name: make archwiki user
   user: name="{{ archwiki_user }}" shell=/bin/false home="{{ archwiki_dir }}" createhome=no
@@ -70,6 +70,9 @@
   notify:
     - restart php-fpm@{{ archwiki_user }}
 
+- name: set php-apcu value
+  copy: src=20-apcu.ini dest=/etc/php/conf.d/20-apcu.ini
+
 - name: start and enable systemd socket
   service: name=php-fpm@{{ archwiki_user }}.socket state=started enabled=true