[....] Restarting mysql (via systemctl): mysql.serviceJob for mysql.service failed because the control process exited with error code. See "systemctl status mysql.service" and "journalctl -xe" for details.
failed!
mysql 5.7好像是没有log-slow-queries 参数,慢日志的看官网资料http://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_slow_query_log
log-error默认就有,不需要在设置
具体要看mysql日志