haproxy中的session保持实现

backend backend_www
    option forwardfor
    cookie SERVERID insert indirect nocache  #插入session信息
    option     redispatch  #当后端rs挂了，可立即切换，不会出现503错误
    option httpchk HEAD / HTTP/1.0
    balance roundrobin
    server www1 192.168.1.198:80 cookie www1check inter 2000 rise 30 fall 15
    server www2 192.168.1.52:80 cookie www2 checkinter 2000 rise 30 fall 15

backend backend_www
    option forwardfor
    option httpchk HEAD / HTTP/1.0
    balance source
    server www1 192.168.1.198:80 check inter2000 rise 30 fall 15
    server www2 192.168.1.52:80check inter 2000 rise 30 fall 15

原文：https://blog.51cto.com/chboy/1768133