[root@www ~]# setsebool -P httpd_can_network_connect_db on
[root@www ~]# chcon -R -t httpd_sys_rw_content_t /var/www/html/piwik/tmp
[root@www ~]# chcon -R -t httpd_sys_rw_content_t /var/www/html/piwik/config
[root@www ~]# semanage fcontext -a -t httpd_sys_rw_content_t /var/www/html/piwik/tmp
[root@www ~]# semanage fcontext -a -t httpd_sys_rw_content_t /var/www/html/piwik/config