尝试服用mongodump时，出现以下错误
mongodump --host 127.0.0.1 --port 27017 --db csgdb
2018-12-12T05:16:39.928+0000 Failed: error connecting to db server:
no reachable servers
即使无法登录mongo shell
mongo --port 27017
MongoDB shell version v3.4.7
connecting to: mongodb://127.0.0.1:27018/
2018-12-12T05:14:54.161+0000 E QUERY [thread1] Error: network error
while attempting to run command 'isMaster' on host '127.0.0.1:27018' :
connect@src/mongo/shell/mongo.js:237:13
@(connect):1:6
exception: connect failed
有帮助吗？