dockerd
A persistent process to start and manage docker containers.
TLDR
Run docker daemon
$ dockerd
Run docker daemon and config it to listen to specific sockets(unix,tcp)
$ dockerd --host unix://[path/to/tmp.sock] --host tcp://[ip]
Run with specific daemon PID file
$ dockerd --pidfile [path/to/pid_file]
Run in debug mode
$ dockerd --debug
Run and set a specific log level
$ dockerd --log-level=[debug|info|warn|error|fatal]