haproxy blue/green

gistfile1.txt

global
        maxconn         20000
        ulimit-n        16384
        log                     127.0.0.1 local0
        pidfile         /tmp/haproxy.pid

frontend blue_env
        bind                    127.0.0.1:8080
        mode            tcp
        default_backend blue_backend

frontend green_env
        bind                    127.0.0.1:8081
        mode            tcp
        default_backend green_backend

backend blue_backend
        mode            http
        server server1 pod_ip:port
        server server2 pod_ip:port
        server server3 pod_ip:port
        server server4 pod_ip:port

backend green_backend
        mode            http
        server server1 pod_ip:port
        server server2 pod_ip:port
        server server3 pod_ip:port
        server server4 pod_ip:port

frontend main_frontend
        bind                    :80
        mode            tcp
        default_backend main_backend

backend main_backend
        mode            http
        server blue 127.0.0.1:8080 check weight 80
        server green 127.0.0.1:8081 check weight 20