Delete MongoDB Log

Check which directories are using disk space

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sudo du -h --max-depth=1

Delete the Mongo Log

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sudo rm -rf /var/log/mongodb/mongod.log

Check which processes have not released the file lock

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sudo lsof | egrep "deleted|COMMAND"

Restart Mongo DB to release the file lock

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sudo service mongod restart

Or run the log rotate command on mongo

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db.adminCommand({logRotate:1})