一.系统准备 1. 创建user——ambari 2.关闭防火墙 redhat6: chkconfig iptables off /etc/init.d/iptables stop redhat7: systemctl disable firewalld service firewalld stop 3.检查最大打开文件数,如果小于10000,需要修改 ulimit -Sn ulimit -Hn If the output is not greater than 10000, run the f