问题描述
我将 varnish 4 服务器与 nginx 一起用作连接到 ELB 的反向代理.
I am having varnish 4 server working with nginx as reverse proxy connected to ELB.
每 2 天左右我的服务器停止响应，我在 nginx access.log 中看到 499 个响应
Every 2 days or so my server is stop responding and I see 499 responses in nginx access.log
重启nginx即可解决问题.
restarting nginx is solving the problem.
为什么我开始收到这 499 条回复?
Why am I started to get these 499 responses?
为什么重启nginx解决问题?
Why restarting nginx solving the issue?
推荐答案
我在了解两个事实后解决了我的问题:
I solved my issue after understanding two facts:
1) ELB 实例具有动态 DNS 名称
1) ELB instance has dynamic DNS name
2) nginx 仅在重新加载/重启时解析 DNS 名称
2) nginx resolve DNS names only on reload/restart
问题是ELB改变了IP地址，nginx保留了原来的IP地址.
The problem was that the ELB changed its IP address and nginx kept the old IP address.
解决办法是在nginx.conf中使用resolver.这是我的 nginx.conf:
The solution is to use resolver in nginx.conf. Here is my nginx.conf:
http {
resolver x.x.x.x valid=30s;
}
server {
set $elb "example.com";
location / {
proxy_pass http://$elb;
}
}
解析器 IP 地址应该是 DNS 服务器，例如/etc/resolv.conf 中.
The resolver IP address should be a DNS server such in /etc/resolv.conf.
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