The error below occurs when mongodb is started. Check the log file and find:
exception in initAndListen std::exception: listen: Address already in use, terminating，
Possible errors:
1. Your conf file is incorrectly written, format or code, etc
2. Bindip binds both the localhost and the internal and external addresses of the server
Solution: check and write the file format, and pay attention to yaml format. Then, bindip directly accesses 0.0.0.0, allowing all access. It should be OK.
If viewing the log is this error:
Failed to set up listener: SocketException: Address already in use
ps aux | grep mongod
sudo kill -9 {port-number}