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HAProxy，对具有不同主机名的多个服务器进行健康检查

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HAProxy，对具有不同主机名的多个服务器进行健康检查

我需要在具有不同主机名的多个正在运行的服务器之间进行负载平衡。我无法在每个服务器上设置相同的虚拟主机。

是否可以只对多个服务器进行一个监听配置，并让健康检查应用该http-send-name-header Host指令？我正在使用 HAProxy 1.5。

我想出了这个有效的 haproxy.cfg，如您所见，我必须为每个健康检查设置不同的主机名，因为健康检查会忽略http-send-name-header Host。我更愿意使用变量或其他方法并使事情更简洁。

global
    log 127.0.0.1 local0 notice
    maxconn 2000
    user haproxy
    group haproxy

defaults
    log     global
    mode    http
    option  httplog
    option  dontlognull
    retries 3
    option redispatch
    timeout connect  5000
    timeout client  10000
    timeout server  10000
    stats enable
    stats uri /haproxy?stats
    stats refresh 5s
    balance roundrobin
    option httpclose

listen inbound :80    
    option httpchk HEAD / HTTP/1.1\r\n
    server instance1 127.0.0.101 check inter 3000 fall 1 rise 1
    server instance2 127.0.0.102 check inter 3000 fall 1 rise 1

listen instance1 127.0.0.101:80
    option forwardfor
    http-send-name-header Host
    option httpchk HEAD / HTTP/1.1\r\nHost:\ www.example.com
    server www.example.com www.example.com:80 check inter 5000 fall 3 rise 2

listen instance2 127.0.0.102:80
    option forwardfor
    http-send-name-header Host
    option httpchk HEAD / HTTP/1.1\r\nHost:\ www.bing.com
    server www.bing.com www.bing.com:80 check inter 5000 fall 3 rise 2

答案1

defaults
log global
retries 2
timeout connect 3000
timeout server 5000
timeout client 5000

listen any-name-1
bind IP-Address:port
mode tcp or http
option user-check user haproxy_check
balance roundrobin
server hostname IpAddress:port check
server hostname  IpAddress:port check
listen any-name-2
bind IP-Address:port
mode tcp or http
option user-check user haproxy_check
balance roundrobin
server hostname IpAddress:port check
server hostanme  IpAddress:port check

listen any-name-3
bind IP-Address:port
mode tcp or http
option user-check user haproxy_check
balance roundrobin
server hostname IpAddress:port check
server hostname  IpAddress:port check

listen any-name-4
bind IP-Address:port
mode tcp or http
option user-check user haproxy_check
balance roundrobin
server hostname IpAddress:port check
server hostname  IpAddress:port check

listen any-name-5
bind IP-Address:port
mode tcp or http
option user-check user haproxy_check
balance roundrobin
server hostname IpAddress:port check
server hostname  IpAddress:port check

listen haproxyadmin
bind HAproxyServerIP:HaproxyPort
mode http
stats enable
stats uri /haproxy
stats realm Strictly\ Private
stats auth username:password

答案2

更新：在您描述的情况下，您需要 HTTP/1.1 检查，该检查要求对主机名进行硬编码。根据 1.5 版的文档，似乎没有办法避免这种情况，除非您能够放弃 http 检查（当然，这通常不推荐）。

原始答案：虽然我不熟悉 haproxy 1.5 的变化，但我将在 1.4 中执行的操作（我相当确定它仍然适用于 1.5）如下。请注意，前端/后端分离只是个人方便，您只需使用 listen 即可。

defaults
    mode http
    option  httplog
    timeout connect  5000
    timeout client  10000
    timeout server  10000

frontend inbound
    bind 127.0.0.1:8000
    default_backend webservers

backend webservers
    option forwardfor
    option httpchk HEAD / HTTP/1.0
    http-send-name-header Host
    server google www.google.com:80 check inter 5000 fall 3 rise 2
    server bing www.bing.com:80 check inter 5000 fall 3 rise 2

结果如下：

$ curl -i localhost:8000
HTTP/1.1 301 Moved Permanently
Cache-Control: no-cache
Content-Length: 0
Location: http://www.bing.com/
Server: Microsoft-IIS/8.0
P3P: CP="NON UNI COM NAV STA LOC CURa DEVa PSAa PSDa OUR IND"
Set-Cookie: _HOP=I=1&TS=1399981378; path=/
Edge-control: no-store
X-MSEdge-Ref: Ref A: 26CEE14531BF45EFAC91FAC3D1945EDF Ref B: 42CE8D142D427C30F7851B56F38837A6 Ref C: Tue May 13 04:42:58 2014 PST
Date: Tue, 13 May 2014 11:42:57 GMT

$ curl -i localhost:8000
HTTP/1.1 301 Moved Permanently
Location: http://www.google.com/
Content-Type: text/html; charset=UTF-8
X-Content-Type-Options: nosniff
Date: Tue, 13 May 2014 11:43:00 GMT
Expires: Thu, 12 Jun 2014 11:43:00 GMT
Cache-Control: public, max-age=2592000
Server: sffe
Content-Length: 219
X-XSS-Protection: 1; mode=block
Alternate-Protocol: 80:quic

<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">
<TITLE>301 Moved</TITLE></HEAD><BODY>
<H1>301 Moved</H1>
The document has moved
<A HREF="http://www.google.com/">here</A>.
</BODY></HTML>
$

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