升级mongo遇到的坑

1. 升级后远程连接无效

   1. 修改/etc/mongd.conf配置文件，将bindIp注释掉

   2. 重启mongo服务，但遇到service mongod restart无效

      sudo /usr/bin/mongod --confif /etc/mongod.conf

       

    

2. 升级升级后Mongo出现Failed to restart mongod.service: Unit mongod.service failed to load: No such file or directory.

   failed to start lsb an object/document-oriented database

   mongodb.service: main process exited, code=exited, status=4/NOPERMISSION

   最终在google上找到答案：

   删除以前的数据库文件并重启服务：

   removed journal and all DBs in /var/lib/mongodb/ then restart the service and it worked again.