failed to start mongod with options code example

Example 1: Failed to enable unit: Unit file mongod.service does not exist.

> sudo systemctl enable mongodb.service

Example 2: Failed to enable unit: Unit file mongod.service does not exist.

> cd /lib/systemd/system
> sudo touch mongodb.service
> sudo nano mongodb.service
[Unit]
Description=An object/document-oriented database
Documentation=man:mongod(1)
After=network.target

[Service]
User=mongodb
Group=mongodb
ExecStart=/usr/bin/mongod --quiet --config /etc/mongodb.conf

[Install]
WantedBy=multi-user.target

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