Advisor check: MongoDB journal enabled

Description

This advisor warns if the journal is not enabled. Disabled journal is dangerous because you could have a serious issue for data durability in case of a failure.

For Production systems, enable journal to ensure that data files are valid/recoverable.

It is always recommended to enable the journal.

In recent versions (starting with versions 4.0 +), MongoDB enables journaling by default and doesn’t allow turning it off.

For more information, see the Journaling section in the MongoDB documentation.

Rule

 storage_journal = parsed.get("storage.journal", {})
 journal_enabled = (storage_journal.get("enabled") == "true")

Resolution

To enable journaling:

1. Enable journal.
2. Edit mongod.conf and set the following parameter:

   storage:
     journal:
       enabled: true
   

3. Roll-restart your mongod (data bearing) nodes.

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