haproxy中的session保持实现
1.在client增加cookiebackend 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 152.balance source 根据原ip，经过hash计算后，指定后端固定的rs
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
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