nginx automatic failover load balancing

nginx automatic failover load balancing

I’m using nginx and NginxHttpUpstreamModule for loadbalancing. My config is very simple:

upstream lb {
server 127.0.0.1:8081;
server 127.0.0.1:8082;
}server {
listen 89;
server_name localhost; location / {
proxy_pass http://lb;
proxy_redirect off;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
}
But with this config, when one of 2 backend server is down, nginx still routes request to it and it results in timeout half of the time

Is there any solution to make nginx to automatically route the request to another server when it detects a downed server.

Thank you.


I think that it’s because nginx is not detecting that the upstream is down because it’s on the same machine.

The options that you’re looking for are:
proxy_next_upstream and
proxy_connect_timeout .

Try this:

location / {
proxy_pass http://lb;
proxy_redirect off;
proxy_next_upstream error timeout invalid_header http_500;
proxy_connect_timeout 2;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
Check more discussion of this question.
http://adminsgoodies.com/speeding-up-page-load-times-by-using-tmpfs/