我这边centos安装mongodb启动报错，有mongo版本，是因为删除了配置文件“/etc/mongod.conf”
解决办法：把 /etc/mongod.conf_bak复制到 /etc/mongod.conf
cp /etc/mongod.conf_bak /etc/mongod.conf
Job for mongod.service failed because the control process exited with error code. See "systemctl status mongod.service" and "journalctl -xe" for details
原文：https://www.cnblogs.com/2186009311CFF/p/12268913.html
