HAproxy
通过国内高质量线路 VPS 上搭建 HAproxy 服务中转
CentOS7
https://www.softwarecollections.org/en/scls/rhscl/rh-haproxy18/
yum install -y centos-release-scl && yum install -y rh-haproxy18
scl enable rh-haproxy18 bash
mv -iv /etc/opt/rh/rh-haproxy18/haproxy/haproxy.cfg{,.ori}
配置文件实例：
# cat /etc/opt/rh/rh-haproxy18/haproxy/haproxy.cfg
global
ulimit-n 51200
defaults
log global
mode tcp
option dontlognull
timeout connect 5000
timeout client 50000
timeout server 50000
frontend ss-inside
bind *:9090
default_backend ss-outside
backend ss-outside
server ss-server 45.67.89.10:9090 maxconn 30720
# systemctl start rh-haproxy18-haproxy
# netstat -lntp|grep -i haproxy
tcp 0 0 0.0.0.0:9090 0.0.0.0:* LISTEN 359/haproxy
# systemctl enable rh-haproxy18-haproxy
Created symlink from /etc/systemd/system/multi-user.target.wants/rh-haproxy18-haproxy.service
to /usr/lib/systemd/system/rh-haproxy18-haproxy.service.
kernel BBR module
国内中转机也需要启用 BBR 内核模块，提高接入客户端的下载速率：
echo -e "net.core.default_qdisc=fq\nnet.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf
sysctl -p