基于 http 状态的 HaProxy 故障转移

Question

HaProxy 是否可以在遇到特定的 http 状态代码时进行故障转移？

如果 tomcat 服务器本身 stops/fails，我有以下通用的 haproxy 代码可以正常工作。但是，当 tomcat 也遇到 http 状态代码 502 Bad Gateway 或 500 Internal Server Error 时，我想进行故障转移.以下配置即使在任何节点遇到500、404状态码也会继续发送流量。

backend db01_replication mode http bind 192.168.0.1:80 server app1 10.0.0.19:8080 check inter 10s rise 2 fall 2 server app2 10.0.0.11:8080 check inter 10s rise 2 fall 2 server app3 10.0.0.13:8080 check inter 10s rise 2 fall 2

提前致谢

Answer 1

我发现以下 HaProxy http-check expect 来解决基于 http 状态代码的负载平衡。

# Only accept status 200 as valid
http-check expect status 200

# Consider SQL errors as errors
http-check expect ! string SQL\ Error

# Consider all http status 5xx as errors
http-check expect ! rstatus ^5

为了在遇到 500 错误时进行故障转移，HaProxy 配置如下所示：

backend App1_replication
 mode http
 bind 192.168.0.1:80
 http-check expect ! rstatus ^5
 server app1 10.0.0.19:8080 check inter 10s rise 2 fall 2
 server app2 10.0.0.11:8080 check inter 10s rise 2 fall 2
 server app3 10.0.0.13:8080 check inter 10s rise 2 fall 2

来源 https://cbonte.github.io/haproxy-dconv/configuration-1.5.html#http-check%20expect

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