haproxy-基于cookie的会话保持

cookie value：为当前server指定cookie值，实现基于cookie的会话黏性，相对于基于 source 地址 hash 调度算法对客户端的粒度更精准，但同时也加大了haproxy负载，目前此模式使用较少， 已经被session共享服务器代替

注意：不支持 tcp mode，使用 http mode

cookie name  [ rewrite | insert | prefix ][ indirect ] [ nocache ][ postonly ] [ preserve ][ httponly ] [ secure ][ domain ]* [ maxidle <idle> ][ maxlife ]

name：       #cookie 的key名称，用于实现持久连接
insert：     #插入新的cookie,默认不插入cookie
indirect：   #如果客户端已经有cookie,则不会再发送cookie信息
nocache：    #当client和hapoxy之间有缓存服务器（如：CDN）时，不允许中间缓存器缓存cookie，因为这会导致很多经过同一个CDN的请求都发送到同一台后端服务器

　　

listen zzhz
    bind 192.168.80.110:81 #IP地址
    mode http
    log global

    cookie ZZHZ insert nocache indirect

    server web1 192.168.80.110:80 weight 1 check inter 3000 fall 2 rise 5 cookie AAA  #名称最好与server的一样。
    server web2 192.168.80.120:80 weight 3 check inter 3000 fall 3 rise 5 cookie BBB

　　

测试结果：

[root@localhost7e ~]# curl -i 192.168.80.110:81

set-cookie: ZZHZ=AAA; path=/

192.168.80.110

[root@localhost7e ~]# curl -i 192.168.80.110:81
HTTP/1.1 200 OK
server: nginx/1.20.1
date: Sat, 23 Jul 2022 09:11:03 GMT
content-type: text/html
content-length: 15
last-modified: Fri, 22 Jul 2022 08:50:22 GMT
etag: "62da64ce-f"
accept-ranges: bytes
set-cookie: ZZHZ=BBB; path=/
cache-control: private

192.168.80.120

[root@localhost7e ~]# curl -vb  ZZHZ=AAA 192.168.80.110:81

[root@localhost7e ~]# curl -vb  ZZHZ=AAA 192.168.80.110:81
* About to connect() to 192.168.80.110 port 81 (#0)
*   Trying 192.168.80.110...
* Connected to 192.168.80.110 (192.168.80.110) port 81 (#0)
> GET / HTTP/1.1
> User-Agent: curl/7.29.0
> Host: 192.168.80.110:81
> Accept: */*
> Cookie: ZZHZ=AAA
> 
< HTTP/1.1 200 OK
< server: nginx/1.20.1
< date: Sat, 23 Jul 2022 09:15:36 GMT
< content-type: text/html
< content-length: 15
< last-modified: Fri, 22 Jul 2022 08:50:17 GMT
< etag: "62da64c9-f"
< accept-ranges: bytes
< 
192.168.80.110
* Connection #0 to host 192.168.80.110 left intact