$ nodeos

1533876ms thread-0   http_plugin.cpp:323           plugin_startup       ] start listening for http requests
1533877ms thread-0   http_plugin.cpp:330           plugin_startup       ] http service failed to start: Address already in use
1533878ms thread-0   main.cpp:133                  main                 ] Address already in use

$ ps -ax | grep keosd

$ kill -9