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Everytime I start MongoDB, it runs for about 1 second before crashing with the following error:

Active: failed (Result: exit-code) since Thu 2020-03-12 09:47:17 EDT; 6s ago Docs: https://docs.mongodb.org/manual Process: 1931 ExecStart=/usr/bin/mongod --config /etc/mongod.conf (code=exited, status=100) Main PID: 1931 (code=exited, status=100) Mar 12 09:47:14 myServer systemd[1]: Started MongoDB Database Server. Mar 12 09:47:17 myServer systemd[1]: mongod.service: Main process exited, code=exited, status=100/n/a Mar 12 09:47:17 myServer systemd[1]: mongod.service: Failed with result 'exit-code'.

Also, in the logs file:

Cannot start server with an unknown storage engine: mmapv1

I've tried reinstalling MongoDB, giving the mongodb user ownership of /var/lib/mongodb, and removing the mongodb.lock file, to no avail.

Any suggestions?

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    You can submit and accept an answer to your own question instead of editing the question with the solution. Commented Mar 12, 2020 at 14:29

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I solved the issue by changing the storage engine to wiredTiger. I did this by editing /etc/mongod.conf and adding "engine: wiredTiger" after "journal: enabled: true"

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