HAProxy 健康检查不工作但 CURL returns 200 OK

Question

我有一个配置了以下后端的 HAProxy 健康检查：

backend php_servers
   http-request set-header X-Forwarded-Port %[dst_port]
   option httpchk get /health
   http-check expect status 200
   server php1 internal_ip:80 check

HAProxy 未启用服务器，但在使用 CURL 时我收到 200 OK 响应。

Command: curl -I internal_ip/health
Response:
HTTP/1.1 200 OK
Server: nginx
Date: Thu, 01 Dec 2016 20:53:48 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
Access-Control-Allow-Origin: api.flex-appeal.nl
X-Frame-Options: SAMEORIGIN
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Cache-Control: no-transform

为什么 HAProxy 无法将服务器识别为 "UP"？看来我可以正常连接。

Answer 1

正确的 HTTP 动词是 GET，而不是 get:

option httpchk GET /health

您还可以 check/enable stats page：在 LastChk 列中您会看到 为什么 检查失败。就我而言，我得到了 501 Not Implemented 响应。

我可以通过执行与 HAProxy 相同的请求来重现它：

$ telnet localhost 80
Trying ::1...
Connected to localhost.
Escape character is '^]'.
get /health HTTP/1.0

HTTP/1.1 501 Not Implemented
Date: Thu, 01 Dec 2016 21:53:09 GMT
Server: Apache/2.4.23 (Unix) PHP/7.0.13
[...]

HAProxy 健康检查不工作但 CURL returns 200 OK

HAProxy health check not working but CURL returns 200 OK

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