redis socket connection in upstream for redis-page times out (504) in some sites

https://support.gridpane.com/a/tickets/314005

Server: 45.63.68.221 client email: [email protected]

Test Page: http://www.gptest.com/the-service/

Default upstream config(/etc/nginx/conf.d/upstream.conf):

upstream redis-page {
server unix:/var/run/redis-page/redis-page.sock;
server 127.0.0.1:6378 backup;
keepalive 10;
}

The test page is not loaded fully and redis store/fetch fails.

If we change the upstream config by removing backup the page loads correctly.

Corrected upstream config:

upstream redis-page {
server unix:/var/run/redis-page/redis-page.sock;
server 127.0.0.1:6378;
keepalive 10;
}

The current workaround is using fastcgi instead of redis cache.