Don't run Bundler as root. Bundler can ask for sudo if it is needed, and installing your bundle as root will break this application for all non-root users on this machine. Usage: kill [options] [...] Options: [...] send signal to every listed -, -s, --signal specify the to be sent -q, --queue integer value to be sent with the signal -l, --list=[] list all signal names, or convert one to a name -L, --table list all signal names in a nice table -h, --help display this help and exit -V, --version output version information and exit For more details see kill(1). [2024-04-08 14:16:19] INFO WEBrick 1.3.1 [2024-04-08 14:16:19] INFO ruby 2.4.1 (2017-03-22) [x86_64-linux] [2024-04-08 14:16:19] INFO WEBrick::HTTPServer#start: pid=2560 port=9292