环境：
lnmp（ubuntu 16.0.4 ；php5.6）
目的：
断电重启虚拟机后启动php5.6服务
问题：
启动php服务报错，报错命令：
➜ ~ sudo service php5.6-fpm start
报错：
Job for php5.6-fpm.service failed because the control process exited with error code. See "systemctl status php5.6-fpm.service" and "journalctl -xe" for details.
根据提示执行命令：
➜ ~ systemctl status php5.6-fpm.service
报错：
1 ● php5.6-fpm.service - The PHP 5.6 FastCGI Process Manager
2 Loaded: loaded (/lib/systemd/system/php5.6-fpm.service; enabled; vendor preset: enabled) 3 Active: failed (Result: exit-code) since Tue 2018-09-11 04:12:17 PDT; 20s ago 4 Docs: man:php-fpm5.6(8) 5 Process: 8843 ExecStart=/usr/sbin/php-fpm5.6 --nodaemonize --fpm-config /etc/php/5.6/fpm/php-fpm.conf (code=exited, status=78) 6 Main PID: 8843 (code=exited, status=78) 7 8 Sep 11 04:12:17 bogon systemd[1]: Starting The PHP 5.6 FastCGI Process Manager... 9 Sep 11 04:12:17 bogon php-fpm5.6[8843]: [11-Sep-2018 04:12:17] ERROR: [/etc/php/5.6/fpm/php-fpm.conf:529] value is NULL for a ZEND_INI_PARSER_ENTRY 10 Sep 11 04:12:17 bogon php-fpm5.6[8843]: [11-Sep-2018 04:12:17] ERROR: failed to load configuration file '/etc/php/5.6/fpm/php-fpm.conf' 11 Sep 11 04:12:17 bogon php-fpm5.6[8843]: [11-Sep-2018 04:12:17] ERROR: FPM initialization failed 12 Sep 11 04:12:17 bogon systemd[1]: php5.6-fpm.service: Main process exited, code=exited, status=78/n/a 13 Sep 11 04:12:17 bogon systemd[1]: Failed to start The PHP 5.6 FastCGI Process Manager. 14 Sep 11 04:12:17 bogon systemd[1]: php5.6-fpm.service: Unit entered failed state. 15 Sep 11 04:12:17 bogon systemd[1]: php5.6-fpm.service: Failed with result 'exit-code'.
黄色高亮为错误原因及错误位置锁定，原因是php-fpm.conf中有错误，根据提示行数去修改
1、若没有对应行，则是因为文件内有包含其他文件，为方便锁定问题把include对应行屏蔽掉，在执行命令，看报错锁定为哪一行。
2、对应行不知道是什么问题，请百度或者直接屏蔽掉
总结：
该问题锁定很明确，请认真排查。
参考文章：
https://blog.csdn.net/LJFPHP/article/details/79896461