This is part 4 of EOS quick-start. Please makesure you have completed [ Part 2 ] Install from sources and have all requirements installed.
Also refer to [ Part 1 ] Introduction for basic information on EOS.IO
Run EOS.IO Local Testnet
after the build successfully finished, you need to run
nodeos --config-dir ./config --data-dir ./data
this will generate data and config folder with default config.ini file in you working folder, then stop it with Ctrl + C.