This service provides a mongo server and nothing more!
Using a description local JSON file:
iocage fetch --plugin-name mongodb.json --name mongodb vnet=On dhcp=On nat=Off
Through the Internet:
iocage fetch --plugin-name mongodb --git_repository https://github.com/libcrack/iocage-plugin-index --branch mongodb --name mongodb vnet=On dhcp=On nat=Off
iocage destroy --recursive mongodb
iocage exec mongodb bash -c 'whoami'