Kroki¶

Kroki is a web service that exposes diagram services that allow you to generate dynamic diagrams from a GET or POST request. The diagrams are typically defined by text.

There is an official image for this service that we'll use: yuzutech/kroki.

Pre-Installation¶

We'll create a folder in the main user's home where all the service's data will be saved.

mkdir ~/services/development/kroki

Docker Compose¶

Kroki will be run using Docker Compose. The content of the docker-compose.yml file is as follows:

services:
  web:
    image: yuzutech/kroki:latest
    restart: unless-stopped
    networks:
      default:
      proxy_external:
        aliases:
          - kroki
    environment:
      TZ: America/Guayaquil
    labels:
      traefik.enable: true
      traefik.docker.network: proxy_external
      traefik.http.routers.kroki.rule: Host(`diagrams.alpha.example.com`) || Host(`diagrams.alpha.home.example.com`)
      traefik.http.routers.kroki.entrypoints: local-https
      traefik.http.routers.kroki.tls: true
      traefik.http.routers.kroki.tls.certresolver: le
      traefik.http.routers.kroki.service: kroki@docker
      traefik.http.services.kroki.loadbalancer.server.port: 8000

networks:
  proxy_external:
    external: true

Reverse Proxy¶

This service is exposed by a reverse proxy. More specifically, it is using Traefik.

For this reason, you will see that this service has:

1. A directive to connect it to the proxy_external external network.
2. A container alias for the proxy_external network.
3. A number of labels with names starting with traefik.

If you're not using a reverse proxy, feel free to remove these from the docker-compose.yml file. Keep in mind you might need to bind the ports to connect to the service instead.

Running¶

Start up the service with:

docker compose up -d

That's it! The service will auto-start on system startup and restart on failure.