1. 在master: 192.168.6.121上执行
netstat -na
可以看到192.168.6.121:8088
2. 在slave1: 192.168.6.150上执行
wget http://192.168.6.121:8088
正在连接 192.168.6.121:8088... 失败:没有到主机的路由
master与slave1之间能相互ping通,ssh登录正常。
原因:centos默认防火墙开放ssh但不开放8088端口。
vi /etc/sysconfig/iptables
# Firewall configuration written by system-config-firewall
# Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 8088 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 11211 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
最后重启防火墙使配置生效
/etc/init.d/iptables restart
关闭防火墙:
建议关掉iptables,因为hadoop用的端口太多了,一个个过滤实在麻烦