无法在本地计算机上运行mongodb 4.0版

Question

当我尝试运行命令mongo时遇到以下错误：

MongoDB shell version v4.0.0
connecting to: mongodb://127.0.0.1:27017
2018-07-24T13:08:13.968+0800 E QUERY    [js] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed: SocketException: Error connecting to 127.0.0.1:27017 :: caused by :: Connection refused :
connect@src/mongo/shell/mongo.js:251:13
@(connect):1:6
exception: connect failed

运行此命令后，sudo service mongod status会给出类似以下内容的输出：

mongod.service - MongoDB Database Server
Loaded: loaded (/lib/systemd/system/mongod.service; enabled; vendor preset: enabled)
Active: failed (Result: core-dump) since Sel 2018-07-24 13:18:18 +08; 45s ago
Docs: https://docs.mongodb.org/manual
Process: 18153 ExecStart=/usr/bin/mongod --config /etc/mongod.conf (code=dumped, signal=ABRT)
Main PID: 18153 (code=dumped, signal=ABRT)
root@him: systemd[1]: Started MongoDB Database Server.
root@him: mongod[18153]: 2018-07-24T13:18:18.777+0800 I CONTROL  [main] Automatically disabling TLS 1.0, to f
root@him: mongod.service: Main process exited, code=dumped, status=6/ABRT
root@him: mongod.service: Unit entered failed state.
root@him: mongod.service: Failed with result 'core-dump'.

Answer 1

当您从终端运行时，数据文件是在root下创建的，而不是mongodb用户。

您需要授予权限：

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

希望这能有所帮助。

Answer 2

我遇到了同样的错误，可能是因为ubuntu从18.04升级到20.04。无法手动启动mongod，原因是缺少/data/db及其权限。然后，mongod将手动启动，但在mongodb.service上仍会出错。最后，重新安装mongodb起作用了。这是一个新的安装，所以不关心备份。

$ sudo apt remove mongodb mongo-tools mongodb-clients mongodb-server mongodb-server-core
$ sudo apt autoremove
$ sudo rm -rf /var/lib/mongodb/
$ sudo apt install mongodb