健康检查结果不对

[idmaoning]

监控了两个udp服务，然后把两个服务都停掉，状态还是up

[veduco]

UDP health check always returns true.
Any upstreams monitored with UDP don't accurately reflect the endpoints status.

Tested on v1.17.8

[ice2lin]

udp 的健康检查还是有问题，随便填一个 udp 结果都是 up

[zhouchangxun]

@idmaoning @veduco @ice2lin ：
The root cause is that I hadn't set default check data which cause the checker didn't send check packet.
I fixed it in this commit: 6188804

Please re-pull the master branch and re-compile & test it again if needed.

Anyway, thank you for you guys' feedback :D

[zhouchangxun]

Please write here if the patch works and I will close this issue after that.

[zhouchangxun]

UDP check depends on icmp reply(port/host unreachable).
So please make sure icmp can work between nginx and backend server otherwise it will assume backend is alive if no any icmp reply.