Error 500 On Service Start

[SkylerGhostly]

Bug description

When starting another container that uses nginx-proxy and nginx-letsencrypt, for about 20-30 seconds while either the container starts or nginx-proxy generates the config, users see a error 500 page. This can be alarming to end users and doesn't look very professional.

Is there a way to prevent this from happening, or is there a way to override this? I've tried adding a custom error 500 but since the error itself is within nginx-proxy while either generating configs or when contacting the upstream, I can't find a way to override this or prevent it.

Any help is much appreciated. Thank you.

EDIT: I'm aware I could fiddle with nginx.tmpl but having to re-apply this change every time this file is updated in the repository is extremely cumbersome.

---

Info: running acme-companion version v2.2.10-13-gb22b6ef

nginx-proxy's Docker configuration

docker-compose.yml

services:
  nginx-proxy:
    image: nginxproxy/nginx-proxy
    container_name: nginx-proxy
    restart: unless-stopped
    ports:
      - "80:80"
      - "443:443"
    volumes:
      - /var/run/docker.sock:/tmp/docker.sock:ro

      - ./error_pages:/usr/share/nginx/html/error_pages
      - ./error_pages/error_pages.conf:/etc/nginx/conf.d/error_pages.conf
      - ./nginx-custom.conf:/etc/nginx/conf.d/my_proxy.conf

      - nginx-vhost:/etc/nginx/vhost.d
      - nginx-html:/usr/share/nginx/html
      - nginx-certs:/etc/nginx/certs:ro
      - nginx-conf:/etc/nginx/conf.d

  nginx-letsencrypt:
    image: nginxproxy/acme-companion
    container_name: nginx-letsencrypt
    restart: unless-stopped
    volumes_from:
      - nginx-proxy
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro
      - nginx-certs:/etc/nginx/certs:rw
      - nginx-acme-sh:/etc/acme.sh
    environment:
      - DEFAULT_EMAIL=email@example.com
      - NGINX_PROXY_CONTAINER=nginx-proxy
      - TRUST_DOWNSTREAM_PROXY=false

volumes:
  nginx-vhost:
  nginx-html:
  nginx-certs:
  nginx-conf:
  nginx-acme-sh:

networks:
  default:
    name: nginx-proxy
    external: true

error_pages.conf

error_page 500 /500.html;
location = /500.html {
    root /usr/share/nginx/html/error_pages;
    internal;
}

error_page 502 /502.html;
location = /502.html {
    root /usr/share/nginx/html/error_pages;
    internal;
}

error_page 503 /503.html;
location = /503.html {
    root /usr/share/nginx/html/error_pages;
    internal;
}

nginx-custom.conf

server_tokens off;
client_max_body_size 1024m;
proxy_buffering    off;
proxy_buffer_size  128k;
proxy_buffers 100  128k;

Docker host

• OS: Debian 12 Bookworm (6.1.0-18-amd64)
• Docker version: 26.0.0