Nginx dns resolver issue after update from 5 to 6

[sc01194]

Hi,

I have upgraded successfully from 5 to 6.

In the upgrade process in some versions of 5.X it was indicated to add the following section to config/nginx/nginx.conf

http {
    resolver 127.0.0.11 ipv6=off valid=10s;
    upstream sharelatex {
      zone dns 64k;
      server sharelatex:80 resolve;
    }
...
}

which gave me the following errors in nginx logs:

nginx  | 2025/12/01 08:50:35 [error] 23#23: sharelatex could not be resolved (110: Operation timed out)
nginx  | 2025/12/01 08:51:05 [error] 23#23: recv() failed (111: Connection refused) while resolving, resolver: 127.0.0.11:53
nginx  | 2025/12/01 08:51:10 [error] 23#23: recv() failed (111: Connection refused) while resolving, resolver: 127.0.0.11:53
nginx  | 2025/12/01 08:51:15 [error] 23#23: recv() failed (111: Connection refused) while resolving, resolver: 127.0.0.11:53
nginx  | 2025/12/01 08:51:20 [error] 23#23: recv() failed (111: Connection refused) while resolving, resolver: 127.0.0.11:53
nginx  | 2025/12/01 08:51:25 [error] 23#23: recv() failed (111: Connection refused) while resolving, resolver: 127.0.0.11:53
nginx  | 2025/12/01 08:51:30 [error] 23#23: recv() failed (111: Connection refused) while resolving, resolver: 127.0.0.11:53

Commenting out the section allow nginx to work properly but I am wondering if I am not missing anything important for coming udpates by removing part of the recommended configuration.

I am not a docker expert and tried to find info on docker internal resolver to see if there was anything bad in my vm config without success. This is probably something trivial I have overlooked.

My containers:

root> docker ps
CONTAINER ID   IMAGE                                           COMMAND                  CREATED          STATUS                    PORTS                                              NAMES
e6ac5a6b6172   nginx:1.28-alpine                               "/docker-entrypoint.…"   15 minutes ago   Up 13 minutes             127.0.1.1:80->80/tcp, 10.178.127.16:443->443/tcp   nginx
dd5563b0436c   sharelatex/sharelatex:6.0.1-with-texlive-full   "/sbin/my_init"          2 days ago       Up 13 minutes             127.0.0.1:80->80/tcp                               55807200e3ea_sharelatex
5c61755c960f   mongo:8.0                                       "docker-entrypoint.s…"   2 days ago       Up 13 minutes (healthy)   27017/tcp                                          mongo
9bf14f0d8a7c   redis:6.2                                       "docker-entrypoint.s…"   5 months ago     Up 13 minutes             6379/tcp                                           redis