将流量从 80 转发到 8080 [关闭]

我已经用puppet安装了tomcat。它在标准 8080 端口上运行。 tomcat进程以tomcat用户身份启动。我想将所有流量从端口 80 重定向到 8080。我的 iptables 设置如下所示：

Nat:

# iptables -L -t nat
Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination         
REDIRECT   tcp  --  anywhere             anywhere             multiport dports http /* 099 forward port 80 to 8080 */ redir ports 8080

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination   

标准 iptables：

# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination         
ACCEPT     icmp --  anywhere             anywhere             /* 000 accept all icmp */
ACCEPT     all  --  anywhere             anywhere             /* 001 accept all to lo interface */
REJECT     all  --  anywhere             loopback/8           /* 002 reject local traffic not on loopback interface */ reject-with icmp-port-unreachable
ACCEPT     all  --  anywhere             anywhere             /* 003 accept related established rules */ state RELATED,ESTABLISHED
ACCEPT     tcp  --  anywhere             anywhere             multiport dports ssh /* 004 accept ssh */
ACCEPT     tcp  --  anywhere             anywhere             multiport dports http,https /* 100 allow http and https access */
DROP       all  --  anywhere             anywhere             /* 999 drop all */

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination  

我看到 netstat 显示 tomcat 进程正在侦听端口 8080：

# netstat -tulpn | grep 80
tcp6       0      0 :::8080                 :::*                    LISTEN      16273/java      
tcp6       0      0 127.0.0.1:8005          :::*                    LISTEN      16273/java      
tcp6       0      0 :::8009                 :::*                    LISTEN      16273/java  

好像没有什么东西在监听 80 端口。telnet到端口 80 和 8080 拥抱的那台机器。

如何将所有流量从 80 转发到 8080？

尝试这个：

sudo iptables -t nat -I PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 8080
sudo iptables -I INPUT -p tcp --dport 8080 -j ACCEPT

并检查流量：

sudo tcpdump -i any -n port 80

如果看不到数据包，则应检查外部防火墙。