Finding the MongoDB Data Directory: Beyond the Default Location

• Databases store collections of information. Imagine a filing cabinet with drawers (databases) holding folders (collections) with documents (data) inside.
• By default, MongoDB stores its data files in a specific directory on your computer, like a designated folder for the filing cabinet. This location is usually /data/db/.
• But, you can choose a different directory to store your data. This is like picking a different room to put the filing cabinet.

The question asks:

• How to find where MongoDB is actually storing the data (the filing cabinet's location) on your system, in case it's not in the usual spot (/data/db/).

1. Use the MongoDB Shell:

• Once connected, run the following command:

  db.adminCommand('getCmdLineOpts')
  

1. Check the Configuration File (Optional):

• If you're not comfortable with the shell or prefer a manual approach, you can check the MongoDB configuration file. The location of this file can vary depending on your operating system and installation method. Here are some common locations:
  • /etc/mongod.conf (Linux)
  • /Library/Preferences/mongodb.conf (macOS)
• Open the configuration file with a text editor and search for the line containing dbPath. The value after dbPath specifies the data directory.

Remember:

• These methods reveal the data directory location. Modifying the data directly in this folder is not recommended.
• Always use the MongoDB shell or official tools to interact with your data.

1. Check the Log Files:

• MongoDB logs information about its startup process, including the data directory path. The log file location can vary based on your setup, but here are some common places to look:
  • /var/log/mongodb/mongod.log (Linux)
• Open the log file with a text editor and search for keywords like "dbpath" or "data directory."

1. Process Listing (for advanced users):

• ps aux | grep mongod