docker编译运行

创建Dockerfile文件

FROM haproxy:2.6.8
COPY haproxy.cfg /usr/local/etc/haproxy/haproxy.cfg


编译docker镜像
docker build -t my-haproxy .

测试配置文件
docker run -it --rm --name haproxy-syntax-check my-haproxy haproxy -c -f /usr/local/etc/haproxy/haproxy.cfg

haproxy在tcp模式下转发客户端的ip

forwardfor 仅在http模式下有效，主要是在http头添加 x-forwarded-for 数据

在tcp模式下就无法获知源的ip。

较新的信息 proxy-protocol协议也是http模式

https://www.haproxy.com/documentation/hapee/latest/load-balancing/client-ip-preservation/enable-proxy-protocol/

frontend mywebsite
  bind :80 accept-proxy
  default_backend webservers

backend webservers
  balance roundrobin
  server s1 192.168.56.20:3000 check send-proxy
  server s2 192.168.56.21:3000 check send-proxy

较旧的信息(2014年) 根据

centos5 - haproxy forwardfor ignored while in tcp mode - Server Fault

x-forwarded-for is an HTTP header field, so has nothing to do with the transport layer (TCP). Usually web proxies insert the x-forwarded-for data.

If you want to have the source IP when balancing at transport layer, then you need to compile haproxy with TPROXY support. See: Configure HAProxy with TPROXY kernel for full transparent proxy

But note that the current Linux kernel has TPROXY support by default (It has done since 2.6.28), so you may be able to skip the kernel step described in the above blog post if your kernel version > 2.6.28.

双域名问题