HTTP's error pages in Docker image

This repository contains:

A very simple generator (nodejs) for HTTP error pages (like 404: Not found) with different templates supports
Dockerfile for docker image with generated pages and nginx as web server

Can be used for Traefik error pages customization.

Demo

Generated pages (from the latest release) always accessible here (sources) and on GitHub pages here.

Development

For project development we use docker-ce + docker-compose. Make sure you have them installed.

Install nodejs dependencies:

$ make install

If you want to generate error pages on your machine (after that look into output directory):

$ make gen

If you want to preview the pages using the Docker image:

$ make preview

Templates

Name	Preview
`ghost`
`l7-light`
`l7-dark`

Usage

Generated error pages in our docker image permanently located in directory /opt/html/%TEMPLATE_NAME%. nginx in a container listen for 8080 (http) port.

Supported environment variables

Name	Description
`TEMPLATE_NAME`	(`ghost` by default) "default" pages template (allows to use error pages without passing theme name in URL - `http://127.0.0.1/500.html` instead `http://127.0.0.1/ghost/500.html`)

HTTP server for error pages serving only

Execute in your shell:

$ docker run --rm -p "8082:8080" tarampampam/error-pages:1.2.0

And open in your browser http://127.0.0.1:8082/ghost/400.html.

Custom error pages for nginx

You can build your own docker image with nginx and our error pages:

# File `./nginx.conf`

server {
  listen      80;
  server_name localhost;

  error_page 401 /_error-pages/401.html;
  error_page 403 /_error-pages/403.html;
  error_page 404 /_error-pages/404.html;
  error_page 500 /_error-pages/500.html;
  error_page 502 /_error-pages/502.html;
  error_page 503 /_error-pages/503.html;

  location ^~ /_error-pages/ {
    internal;
    root /usr/share/nginx/errorpages;
  }

  location / {
    root  /usr/share/nginx/html;
    index index.html index.htm;
  }
}

FROM nginx:1.18-alpine

COPY --chown=nginx \
     ./nginx.conf /etc/nginx/conf.d/default.conf
COPY --chown=nginx \
     --from=tarampampam/error-pages:1.2.0 \
     /opt/html/ghost /usr/share/nginx/errorpages/_error-pages

More info about error_page directive can be found here.

Custom error pages for Traefik

Simple traefik (tested on v2.2.1) service configuration for usage in docker swarm (change with your needs):

version: '3.4'

services:
  error-pages:
    image: tarampampam/error-pages:1.2.0
    environment:
      TEMPLATE_NAME: l7-dark
    networks:
      - traefik-public
    deploy:
      placement:
        constraints:
          - node.role == worker
      labels:
        traefik.enable: 'true'
        traefik.docker.network: traefik-public
        # use as "fallback" for any non-registered services (with priority below normal)
        traefik.http.routers.error-pages-router.rule: HostRegexp(`{host:.+}`)
        traefik.http.routers.error-pages-router.priority: 10
        # should say that all of your services work on https
        traefik.http.routers.error-pages-router.tls: 'true'
        traefik.http.routers.error-pages-router.entrypoints: https
        traefik.http.routers.error-pages-router.middlewares: error-pages-middleware@docker
        traefik.http.services.error-pages-service.loadbalancer.server.port: 8080
        # "errors" middleware settings
        traefik.http.middlewares.error-pages-middleware.errors.status: 400-599
        traefik.http.middlewares.error-pages-middleware.errors.service: error-pages-service@docker
        traefik.http.middlewares.error-pages-middleware.errors.query: /{status}.html

  any-another-http-service:
    image: nginx:alpine
    networks:
      - traefik-public
    deploy:
      placement:
        constraints:
          - node.role == worker
      labels:
        traefik.enable: 'true'
        traefik.docker.network: traefik-public
        traefik.http.routers.another-service.rule: Host(`subdomain.example.com`)
        traefik.http.routers.another-service.tls: 'true'
        traefik.http.routers.another-service.entrypoints: https
        # next line is important
        traefik.http.routers.another-service.middlewares: error-pages-middleware@docker
        traefik.http.services.another-service.loadbalancer.server.port: 80

networks:
  traefik-public:
    external: true