Basho\Riak\Node\Config::setHost PHP Method

    public function setHost($host)
    {
        $this->host = $host;
    }

 /**
  * Build with host address
  *
  * Build node objects with configuration to use a specific host address
  *
  * @param $host
  * @return $this
  */
 public function atHost($host)
 {
     $this->config->setHost($host);
     return $this;
 }