修改MongoDB默认数据路径只需以下几步

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$ sudo systemctl stop mongod.service

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$ sudo rsync -av /var/lib/mongo /mnt/database/mongodb/

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$ sudo mv /var/lib/mongo /var/lib/mongo.bak

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$ sudo vi /etc/mongod.conf

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dbPath: /mnt/database/mongodb/mongo

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$ sudo systemctl start mongod.service

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$ sudo systemctl status mongod.service

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$ sudo cat /var/log/mongodb/mongod.log

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[thread1] waiting for connections on port <port></port>