Hi,
In " Lab: Creating First Application User":
user@M103# mongod -f mongod.conf
2022-04-19T14:15:54.080+0000 I CONTROL [main] Automatically disabling TLS 1.0, to force-enable TLS 1.0 specify --sslDisabledProtocols 'none'
2022-04-19T14:15:54.086+0000 I CONTROL [initandlisten] MongoDB starting : pid=378 port=27000 dbpath=/var/mongodb/db 64-bit host=OpC3Re6zyO6nn5iEUq
2022-04-19T14:15:54.086+0000 I CONTROL [initandlisten] db version v4.0.5
2022-04-19T14:15:54.086+0000 I CONTROL [initandlisten] git version: 3739429dd92b92d1b0ab120911a23d50bf03c412
2022-04-19T14:15:54.086+0000 I CONTROL [initandlisten] OpenSSL version: OpenSSL 1.1.1g 21 Apr 2020
2022-04-19T14:15:54.086+0000 I CONTROL [initandlisten] allocator: system
2022-04-19T14:15:54.086+0000 I CONTROL [initandlisten] modules: none
2022-04-19T14:15:54.086+0000 I CONTROL [initandlisten] build environment:
2022-04-19T14:15:54.086+0000 I CONTROL [initandlisten] distarch: x86_64
2022-04-19T14:15:54.087+0000 I CONTROL [initandlisten] target_arch: x86_64
2022-04-19T14:15:54.087+0000 I CONTROL [initandlisten] options: { config: "mongod.conf", net: { bindIp: "localhost", port: 27000 }, security: { authorization: "enabled" }, storage: { dbPath: "/var/mongodb/db" } }
2022-04-19T14:15:54.087+0000 E STORAGE [initandlisten] Failed to set up listener: SocketException: Address in use
2022-04-19T14:15:54.087+0000 I CONTROL [initandlisten] now exiting
2022-04-19T14:15:54.087+0000 I CONTROL [initandlisten] shutting down with code:48