What ports does SQL Server use on Linux?

- Assuming the defaults here is the best solution for what port does sql server use, there are two ports SQL Server listens on which can be verified with netstat -ln,

• ms-sql-s TCP 1433 for the server
  
• ms-sql-m TCP 1434 for the Dedicated Administrator Connection which by default is enabled for local connections on 127.0.0.1 only. For more information see "remote admin connections Server Configuration Option"
  

While my install was only listening for TCP connections, /etc/services shows entries for UDP too,
ms-sql-s 1433/tcp # Microsoft SQL Server ms-sql-s 1433/udp ms-sql-m 1434/tcp # Microsoft SQL Monitor ms-sql-m 1434/udp
The "Microsoft SQL Monitor" is the DAC connection.
The log also shows similar information,
spid19s Server is listening on [ 'any'  1433]. spid19s Server is listening on [ 'any'  1433]. Server Server is listening on [ ::1  1434]. Server Server is listening on [ 127.0.0.1  1434].
Hope this helps!