Question

I think someone has already suggested:

1. stop the mongod
2. backup the data directory

Is it reliable, I mean, ensure 100% success to restore?
And I can’t find which directory stores the data… any command can help me to find it?

Answer 1

If mongod process exits cleanly (that is, no crashes or kill -9 stuff), then it is safe to copy data files somewhere.

If your current installation breaks (for example, data corruption due to unclean shutdown), you can delete its files, copy that backup over and start mongod again.

Default data directory is /data/db, but it may be set to another value in your config file. For example, I set it to /var/lib/mongodb.

You can also use mongodump to do a backup from a live server (this may impact performance). Use mongorestore to restore backups made by mongodump.