nginx+php-fpm環境でのCakePHPで"Warning (2): session_start()"エラーが出る

##環境
OS: CentOS 6.4
Web: nginx 1.4.2
PHP: php-fpm 5.4.17
CakePHP: 2.3.8

##エラー内容
上記の環境下でCakeインスト後ダッシュボード(?)画面で

Warning (2): session_start(): open(/var/lib/php/session/sess_*******, O_RDWR) failed: No such file or directory (2) [CORE/Cake/Model/Datasource/CakeSession.php, line 618]

##調べてみる

$ vim /etc/php.ini
; RPM note : session directory must be owned by process owner
; for mod_php, see /etc/httpd/conf.d/php.conf
; for php-fpm, see /etc/php-fpm.d/*conf
;session.save_path = "/tmp"

$ vim /etc/php-fpm.d/www.conf
php_value[session.save_path] = /var/lib/php/session

$ ls /var/lib/php

フォルダがない。

##解決策

$ sudo mkdir /var/lib/php/session
$ sudo chown nginx.nginx /var/lib/php/session