使用 ssh -R 穿透局域网访问内部服务器主机，反向代理无人值守化

一、搭建SSH方向代理

准备：

局域网主机(虚拟主机)： 192.168.6.233 CentOS 6.7

阿里云服务器：120.25.68.60 CentOS 6.7

1. 阿里云服务器120.25.68.60上需要修改sshd_config配置文件：

[root@120.25.68.60 ~]# vi /etc/ssh/sshd_config
GatewayPorts yes
[root@120.25.68.60 ~]# service sshd reload
Reloading sshd: [  OK  ]

2. 通过局域网虚拟机192.168.6.233 连接到120.25.68.60开启反向端口代理，输入阿里云服务器密码.

root@192.168.6.233:~ # ssh -CqTfnN -R 0.0.0.0:7233:192.168.6.233:22 root@120.25.68.60
root@120.25.68.60's password:

3.在阿里云服务器120.25.68.60上可以看到这个监听.

[root@120.25.68.60 ~]# netstat -anp | grep 7233
tcp        0      0 0.0.0.0:7233                0.0.0.0:*                   LISTEN      2392/sshd  
tcp        0      0 :::7233                     :::*                        LISTEN      2392/sshd

4.现在到其他客户机上连接阿里云服务器120.25.68.60的7233端口,输入局域网虚拟主机192.168.6.233的主机密码.

[root@192.168.4.194 ~]# ssh -p 7233 root@120.25.68.60
root@120.25.68.60's password:
Last login: Thu Mar 24 11:01:15 2016 from 192.168.6.233


[root@phpdragon_233 ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:50:56:34:8B:4D
          inet addr:192.168.6.233  Bcast:192.168.6.255  Mask:255.255.255.0
          inet6 addr: fe80::250:56ff:fe34:8b4d/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1321125 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1232406 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:450626290 (429.7 MiB)  TX bytes:273698355 (261.0 MiB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:524375 errors:0 dropped:0 overruns:0 frame:0
          TX packets:524375 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:43705227 (41.6 MiB)  TX bytes:43705227 (41.6 MiB)

到这里反向代理的测试完成，功能OK.

二、反向代理无人值守化

1.设置局域网主机192.168.6.233免密码登录到阿里云120.25.68.60. 参见 http://www.cnblogs.com/phpdragon/p/4521116.html

ssh-keygen -t rsa -P ''
scp ~/.ssh/id_rsa.pub root@120.25.68.60:/tmp/id_rsa.pub_233
ssh -l root 120.25.68.60 cat /tmp/id_rsa.pub_233 >> ~/.ssh/authorized_keys

2.阿里云服务器编写ssh代理关闭脚本 kill_ssh_agent.sh

#!/bin/sh

if [ -n "$1" ] && [ "$1" -gt "0" ];then
    PID=$(netstat -anp | grep $1 | awk '/sshd/ && !/awk/{print $7}')
    PID=${PID%%/*}

    if [ -n "${PID}" ];then
        kill -9 $PID && exit 0
    fi
fi

exit 1

3.客户端编写代理链接守护脚本 ssh_agent_deamon.sh

#########################################################################
# File Name: ssh_agent_deamon.sh
# Author: phpdragon
# mail: phpdragon@qq.com
# Created Time: Thu 24 Mar 2016 01:55:49 PM CST
#########################################################################
#!/bin/bash

ROMOTE_USERNAME=root
ROMOTE_SERVER_IP="120.25.68.60"
ROMOTE_PORT=7233 
###[ /sbin/ifconfig|sed -n '/inet addr/s/^[^:]*:([0-9.]{7,15}) .*/1/p'|grep -v 127.0.0.1 ]
LOCALHOST_IP=`/sbin/ifconfig -a|grep inet|grep -v 127.0.0.1|grep -v inet6|awk '{print $2}'|tr -d "addr:"`
LOCALHOST_PORT=22

while true ;
do
    PID=$(ssh -l root ${ROMOTE_SERVER_IP}  netstat -anp | grep ${ROMOTE_PORT} | awk '/sshd/ && !/awk/{print $7}')
    PID=${PID%%/*}
    if [ -n "$PID" ] && [ "$PID" -gt "0" ];then
        sleep 30s
    else
        /usr/bin/ssh -l root ${ROMOTE_SERVER_IP} /bin/sh /data/kill_ssh_agent.sh ${ROMOTE_PORT}
        /usr/bin/ssh -CqTfnN -R 0.0.0.0:${ROMOTE_PORT}:${LOCALHOST_IP}:${LOCALHOST_PORT} ${ROMOTE_USERNAME}@${ROMOTE_SERVER_IP}
    fi
done

exit 0

4.设置ssh连接为长连接

vi /etc/ssh/sshd_config

#每1分钟发送一个心跳信号给客户端
ClientAliveInterval 60
#最大超时次数,客户端不响应则关闭连接
ClientAliveCountMax 3

5.设置为随机启动

vi /etc/rc.local

/bin/sh /data/ssh_agent_deamon.sh &

到此设置完毕。

PS:

http://blog.163.com/digoal@126/blog/static/163877040201451464251856

http://www.cnblogs.com/wangkangluo1/archive/2011/06/29/2093727.html

http://www.cnblogs.com/peida/archive/2013/03/08/2949194.html

http://www.cnblogs.com/ggjucheng/archive/2012/01/08/2316661.html

使用 ssh -R 穿透局域网访问内部服务器主机，反向代理 无人值守化