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Old collection in mongodb not showing up after creating data/db/

I am new to mongodb, but I’m working on a project which was using mongo and had created a large collection with a large number of documents. I was able to work with it no problem.

Today when I tried to start mongod I got the following error –

{"t":{"$date":"2024-11-01T15:29:16.827-07:00"},"s":"E",  "c":"CONTROL",  "id":20557,   "ctx":"initandlisten","msg":"DBException in initAndListen, terminating","attr":{"error":"NonExistentPath: Data directory /data/db not found. Create the missing directory or specify another path using (1) the --dbpath command line option, or (2) by adding the 'storage.dbPath' option in the configuration file."}}

I looked and /data/db didn’t exist, so I created it.
Now I was able to start mongod, but the old collection I was working with is not showing up.

How can I fix this? It was 100s of GBs of collected data, did I lose it?

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2

Answers


  1. 0

    When you created the new data directory, MongoDB didn’t automatically migrate the existing data from the old directory. This is because MongoDB stores its data in a specific directory, and it expects the data to be in the correct format.

    mongod --repair
mongodump -d your_database_name
mongorestore -d your_database_name /path/to/backup
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  2. 0

    Most likely you started your MongoDB differently. /data/db is the default path when you don’t specify any storage.dbPath (or --dbpath).

    Check your previous scripts how mongod was started and then start your MongoDB with the same dbPath – or copy the files to /data/db folder.

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