我已经安装了mongo，几次运行shell成功，然后我尝试添加：
security:
authorization: disabled
因为我想将用户Admin添加到admin db。之后，我无法访问mongo shell，运行命令mongo时会出现此错误
MongoDB shell version v3.6.2
connecting to: mongodb://127.0.0.1:27017
2018-02-09T09:34:48.769+0700 W NETWORK [thread1] Failed to connect to 127.0.0.1:27017, in(checking socket for error after poll), reason: Connection refused
2018-02-09T09:34:48.769+0700 E QUERY [thread1] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed :
connect@src/mongo/shell/mongo.js:251:13
@(connect):1:6
exception: connect failed
这是禁用授权后日志文件的最后几行，即使再次启用它，事情也不起作用/var/log/mongodb/mongod.log
2018-02-09T09:33:00.843+0700 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database.
2018-02-09T09:33:00.843+0700 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted.
2018-02-09T09:33:00.843+0700 I CONTROL [initandlisten]
2018-02-09T09:33:00.847+0700 F CONTROL [initandlisten] ** IMPORTANT: UPGRADE PROBLEM: The data files need to be fully upgraded to version 3.4 before attempting an upgrade to 3.6; see http://dochub.mongodb.org/core/3.6-upgrade-fcv for more details.
2018-02-09T09:33:00.847+0700 I NETWORK [initandlisten] shutdown: going to close listening sockets...
2018-02-09T09:33:00.847+0700 I NETWORK [initandlisten] removing socket file: /tmp/mongodb-27017.sock
2018-02-09T09:33:00.847+0700 I REPL [initandlisten] shutdown: removing all drop-pending collections...
2018-02-09T09:33:00.847+0700 I REPL [initandlisten] shutdown: removing checkpointTimestamp collection...
2018-02-09T09:33:00.848+0700 I STORAGE [initandlisten] shutdown: waiting for fs preallocator...
2018-02-09T09:33:00.848+0700 I STORAGE [initandlisten] shutdown: final commit...
2018-02-09T09:33:00.849+0700 I JOURNAL [initandlisten] journalCleanup...
2018-02-09T09:33:00.849+0700 I JOURNAL [initandlisten] removeJournalFiles
2018-02-09T09:33:00.876+0700 I JOURNAL [initandlisten] old journal file /var/lib/mongodb/journal/j._0 will be reused as /var/lib/mongodb/journal/prealloc.0
2018-02-09T09:33:00.899+0700 I JOURNAL [initandlisten] Terminating durability thread ...
2018-02-09T09:33:00.950+0700 I JOURNAL [journal writer] Journal writer thread stopped
2018-02-09T09:33:00.950+0700 I JOURNAL [durability] Durability thread stopped
2018-02-09T09:33:00.950+0700 I STORAGE [initandlisten] shutdown: closing all files...
2018-02-09T09:33:00.953+0700 I STORAGE [initandlisten] closeAllFiles() finished
2018-02-09T09:33:00.953+0700 I STORAGE [initandlisten] shutdown: removing fs lock...
2018-02-09T09:33:00.953+0700 I CONTROL [initandlisten] now exiting
2018-02-09T09:33:00.953+0700 I CONTROL [initandlisten] shutting down with code:62
我尝试运行sudo service mongod restart但不起作用。
那么你能否就这个问题给我一些建议，谢谢
答案 0 :(得分：2)
似乎mongod无法启动，因为您的系统已从版本＆lt;更新了mongodb正如日志中所述的3.4至3.6：The data files need to be fully upgraded to version 3.4 before attempting an upgrade to 3.6
您需要将mongodb降级到3.4，然后sudo service mongod start才能将db迁移到3.4。
答案 1 :(得分：1)
我只是尝试运行此命令，它适用于我brew services start mongodb
干杯。