Server restart = Redis Dead = EE dead

[pojke]

It seems like EEv4 is very prone to errors during the host restart. Latest EE, Ubuntu 18 installed about a week ago on EC2.

The issue is with Redis. After a restart, all of the sites on that machine lost the Redis connection.

2019/08/21 05:51:06 [error] 47#47: *4 no live upstreams while connecting to upstream, client: 111.111.111.111, server: staging.website.com, request: "GET / HTTP/2.0", upstream: "http://staging.website.com-42099b4af021e53fd8fd4e056c2568d7c2e3ffa8/", host: "staging.website.com"

Restart of Redis, Nginx-proxy, Site, Host again - didn't bring back the connection. Redis disable functionality doesn't exist. Luckily this was a staging server. A workaround at this stage (unfortunately) is to delete the site and install it again.