UPDATE: 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"
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: Started MongoDB Database Server. Mar 12 09:47:17 myServer systemd: mongod.service: Main process exited, code=exited, status=100/n/a Mar 12 09:47:17 myServer systemd: 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.