原有环境：Ubuntu14.04+nginx+php5.4-fpm
目标：将php-fpm从5.4升级到5.6
1、卸载php5.4
sudo apt-get --purge removephp5-fpm
2、安装php5.6-fpm
sudo apt-get install python-software-properties
sudo add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt-get -y install php5.6-fpm php5.6-mcrypt php5.6-mbstring php5.6-curl php5.6-cli php5.6-mysql php5.6-gd php5.6-intl php5.6-xsl php5.6-zip
3、配置php5.6-fpm
sudo vi /etc/php/5.6/fpm/pool.d/www.conf
listen = /var/run/php5-fpm.sock 改为listen = 127.0.0.1:9000
pm.max_children修改为300
pm.start_servers=10
pm.min_spare_servers=10
pm.max_spare_servers=300
pm.max_requests=10240
