setup nginx not to crash if host in proxy pass not found

[pecqueurS]

Is your feature request related to a problem? Please describe.
When the proxy_host is used to proxy a docker container and this container is shut down afterwards, if you restart nginx-proxy-manager, it generates an error because the ___domain no longer exists. Nginx-proxy-manager can no longer launch.

Describe the solution you'd like
Modify the proxy pass option in nginx
actual :
proxy_pass http://:/;
proposal :

No stop when error on config

https://stackoverflow.com/questions/32845674/setup-nginx-not-to-crash-if-host-in-upstream-is-not-found/32846603#32846603

https://stackoverflow.com/questions/35744650/docker-network-nginx-resolver/37656784#37656784

resolver 127.0.0.11 valid=30s ipv6=off;
set $upstream_pass http://:/;
proxy_pass $upstream_pass;

Describe alternatives you've considered
Easier access to proxy_host configuration when nginx-proxy-manager is off to remove non-working configuration

Additional context
error when nginx-proxy-manager is restarted :
host not found in upstream "bar:3000" in /data/nginx/proxy_host/1.conf

[kabadisha]

I also had this problem. I've raised a PR which I believe fixes the issue:
#2672
If you can test my fix, that would be really helpful.

[github-actions]

Issue is now considered stale. If you want to keep it open, please comment 👍

[Scemist]

Same problem here, it doesn't make sense to fail the Nginx server for one proxy pass, since you can use it as an proxy for multiples addresses. So if some of websites fails, all the others will too.

[Lavshyak]

location /foo/ {
        resolver 127.0.0.11; #(in my case with docker)
        set $upstream_server someserver:80;
        proxy_pass http://$upstream_server/;
}

now nginx don't crashes when someserver:80 is down

Upd: but then nginx cut off the rest of the request uri. http://host/foo/bar becomes just http://someserver:80/. How to fix this?

[tyyrok]

location /foo/ {
        resolver 127.0.0.11; #(in my case with docker)
        set $upstream_server someserver:80;
        proxy_pass http://$upstream_server/;
}

now nginx don't crashes when someserver:80 is down

Upd: but then nginx cut off the rest of the request uri. http://host/foo/bar becomes just http://someserver:80/. How to fix this?

Hi. Look at this article:

https://dev.to/danielkun/nginx-everything-about-proxypass-2ona#let-nginx-start-even-when-not-all-upstream-hosts-are-available

[Lavshyak]

nginx:mainline-alpine3.18-perl works well for me. I don't notice any failures

[ZandercraftGames]

Also having the same issue here. Quite frustrating to get working.

[abstract-entity]

got the same with latest nginx docker image