PHP-FPM进程数的设定

https://www.douban.com/note/315222037/

http://www.cnblogs.com/ahaii/p/5776809.html

http://www.jb51.net/article/37749.htm

https://www.cmhello.com/php-fpm.html

apt-get  和  yum 的区别

http://www.cnblogs.com/garinzhang/p/diff_between_yum_apt-get_in_linux.html