• 首先连接不上，先查看云服务器上的安全组是否添加了对应的端口
• 如果打开了，那么久查看MongoDB是否允许远程连接

# mongod.conf# for documentation of all options, see:#   http://docs.mongodb.org/manual/reference/configuration-options/# Where and how to store data.storage:  dbPath: /var/lib/mongodb  journal:    enabled: true#  engine:#  mmapv1:#  wiredTiger:# where to write logging data.systemLog:  destination: file  logAppend: true  path: /var/log/mongodb/mongod.log# network interfacesnet:  port: 27017  bindIp: 0.0.0.0#processManagement:#security:#operationProfiling:#replication:#sharding:## Enterprise-Only Options:#auditLog:#snmp:

重点查看net下的bindIp，如果是127.0.0.1的话就改成0.0.0.0

使用启动命令：

sudo systemctl start mongod

因为使用

sudo service mongodb start

会报错

查看MongoDB的日志：

cat /var/log/mongodb/mongod.log

如果报错是：

Detected unclean shutdown - /var/lib/mongodb/mongod.lock is not empty.

那就直接删除掉那个文件

rm -rf /var/lib/mongodb/mongod.lock

如果报错为：

Failed to unlink socket file /tmp/mongodb-27017.sock Operation not permitted

那就直接删除掉那个文件：

rm -rf /tmp/mongodb-27017.sock

如果报错为：

WiredTiger error (13) [1543829280:361502][14474:0x7f42abbdad00], file:WiredTiger.wt, connection: /var/lib/mongodb/WiredTiger.turtle: handle-open: open: Permission denied

那就提升权限：

sudo chown -R mongodb:mongodb /var/lib/mongodb

然后使用

sudo systemctl start mongod

启动即可