1.关闭防火墙，永久关闭指令
chkconfig iptables off
2.配置hadoop-env.sh，配置yarn-env.sh
3.启动datanode,namenode
sbin/hadoop-daemon.sh start datanode
sbin/hadoop-daemon.sh start namenode
访问50070端口
4.启动resourcemanager,nodemanager
sbin/yarn-daemon.sh start resourcemanager
sbin/yarn-daemon.sh start nodemanager
访问8088端口