truffle-config.js

module.exports = {

    rpc: {

        host: "localhost",

        port: 8543

    },

    networks: {

        development: {

            host: "localhost", //our network is running on localhost

            port: 8543, // port where your blockchain is running

            network_id: "*",

            from: "0x4539ea1bd2e66427eb9142c3fd352aaa3c8b9705", // use the account-id generated during the setup process

            gas: 1000000

        }

    }

};