执行systemctl status -l php-fpm.service得到问题所在：
/usr/local/php/sbin/php-fpm: error while loading shared libraries: libonig.so.2: cannot open shared object file: No such file or directory
解决：执行ln -s /usr/lib64/libonig.so /usr/lib64/libonig.so.2再启动php-fpm服务即可