SS中转方案 - lightless blog

纯搬运https://github.com/shadowsocks/shadowsocks/wiki/Setup-a-Shadowsocks-relay

Client <--> VPS_JUMP <--> VPS_TARGET

Easy Version

Setup Shadowsocks server as usual on VPS_TARGET.
On VPS_JUMP, enable forwarding. Replace VPS_TARGET_IP and VPS_JUMP_IP with actual IP:

sudo su
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A PREROUTING -p tcp --dport 8388 -j DNAT --to-destination Target_VPS_IP:8388
iptables -t nat -A POSTROUTING -p tcp -d Target_VPS_IP --dport 8388 -j SNAT --to-source JUMP_VPS_IP

Set your server to JAPAN_VPS_IP:8388 on your client.

Pro Version

For those who want more control and better performance, use haproxy instead. You can also enable load balance by adding multiple servers.

For Debian 7.0:

On JUMP VPS. Append the following line to /etc/apt/sources.list

deb http://ftp.us.debian.org/debian/ wheezy-backports main
Run

apt-get install haproxy
Edit /etc/haproxy/haproxy.cfg

global
        ulimit-n  51200

defaults
        log global
        mode    tcp
        option  dontlognull
        contimeout 1000
        clitimeout 150000
        srvtimeout 150000

frontend ss-in
        bind *:8388
        default_backend ss-out

backend ss-out
        server server1 US_VPS_IP:8388 maxconn 20480

Then run haproxy -f /etc/haproxy/haproxy.cfg