"no live upstreams while connecting to upstream" Error , Nginx load balancer error

Question

There is a persistent error ever since I upgraded to php8.1 and added a new connection to the upstream of the load balancer. I have looked into all the possible errors and cannot see anything wrong with the configurations. This is a Very recent problem and is a big issue as it causes downtime on the site due to 502 bad gateway error…

The error logs on the load balancer site.com-error.logs show this.

 [error] 749104#749104: *1042482 no live upstreams while connecting to upstream, client: IP, server: site.com, request: "GET / HTTP/1.1", upstream: "http://proxy_pass/", host: "site.com"

This error started showing up more times and I changed the max fails to be 3. This does not fix all the 502 errors I get in the access logs. it just masks the issue. The fact that I added a new server into the upstream could be the issue but the requests still go through to php and the site stays up until the 502 errors come in. And then I get a “no live connection error”

I would really appreciate any help here! thanks

Bobby Iliev · Answer

Hi there,

As this is a persistent error and it has started occurring after a PHP FPM upgrade, can you confirm if you’ve changed your Nginx proxy pass rule to match the new PHP FPM version? Example:

        fastcgi_pass unix:/var/run/php/php8.1-fpm.sock;

If this is the case, would it be possible for you to share your Nginx server block here so I could see if there is anything wrong with it?

As a side note, I could also suggest taking a look at the following tutorial on how to troubleshoot common Nginx errors:

https://www.digitalocean.com/community/questions/how-to-troubleshoot-common-nginx-issues-on-linux-server

Best,

Bobby

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