The various parameters that you wish to enable or disable can be set in the

/etc/mongodb.conf

config file.

All the command-line parameters can be mentioned in that file, and setting the values to true or false.

In your case, add a line as follows, preferably somewhere after the dbpath is mentioned.

rest = true

After each change to the configuration file, you need to restart the server to take effect:

sudo service mongodb restart

For more options, take a look at the documentation.