记录在 VPS 搭建 shadowsocks 翻墙全过程

准备 VPS

选择 DigitalOcean 作为 VPS：

  1. 稳定性不错
  2. 有途径获得35刀免费试用7个月
  3. kvm 虚拟化，支持调节内核参数

如何获得35美元？

  • 通过推广链接注册
  • 绑定信用卡或用paypal激活账户,获得10刀
  • 注册Codeanywhere帐号
  • 注册好后依次点击File -> New Connection -> Digital Ocean, 点击Get Coupon
  • 获得优惠后在DigitalOcean的Billing界面填入, 再获得25刀

安装 shadowsocks-libev

~ # dnf copr enable librehat/shadowsocks
~ # dnf update
~ # dnf install shadowsocks-libev

编辑服务器端配置文件 /etc/shadowsocks-libev/config.json

{
    "server":"0.0.0.0",
    "server_port":10718,
    "local_port":1080,
    "password":"passwd",
    "timeout":800,
    "method":"chacha20",
    "fast_open":true,     // 需要内核 3.7+
    "mode": "tcp_and_udp"
}

systemctl enable shadowsocks-libev.service   # 开机自启动
systemctl start shadowsocks-libev.service    # 运行ss-server

修改内核参数

编辑/etc/sysctl.conf

# max open files
fs.file-max = 51200
# max read buffer
net.core.rmem_max = 67108864
# max write buffer
net.core.wmem_max = 67108864
# default read buffer
net.core.rmem_default = 65536
# default write buffer
net.core.wmem_default = 65536
# max processor input queue
net.core.netdev_max_backlog = 4096
# max backlog
net.core.somaxconn = 4096

# resist SYN flood attacks
net.ipv4.tcp_syncookies = 1
# reuse timewait sockets when safe
net.ipv4.tcp_tw_reuse = 1
# turn off fast timewait sockets recycling
net.ipv4.tcp_tw_recycle = 0
# short FIN timeout
net.ipv4.tcp_fin_timeout = 30
# short keepalive time
net.ipv4.tcp_keepalive_time = 1200
# outbound port range
net.ipv4.ip_local_port_range = 10000 65000
# max SYN backlog
net.ipv4.tcp_max_syn_backlog = 4096
# max timewait sockets held by system simultaneously
net.ipv4.tcp_max_tw_buckets = 5000
# turn on TCP Fast Open on both client and server side
net.ipv4.tcp_fastopen = 3
# TCP receive buffer
net.ipv4.tcp_rmem = 4096 87380 67108864
# TCP write buffer
net.ipv4.tcp_wmem = 4096 65536 67108864
# turn on path MTU discovery
net.ipv4.tcp_mtu_probing = 1

# require linux kernel 4.9
net.core.default_qdisc=fq
# for high-latency network
net.ipv4.tcp_congestion_control =bbr

# for strongswan vpn
net.ipv4.ip_forward = 1

然后执行

sysctl -p