eilandert/sitemap_warmup repository overview

⁠sitemap_warmup — cache + index warmup utility Docker image

eilandert/sitemap_warmup is a small utility image that reads a site's XML sitemap and warms it — fetching every URL so the server-side cache (WP Fastest Cache, nginx/Angie cache, PageSpeed) is primed and pages serve hot. It's a support tool in the deb.myguard.nl⁠ stack, run on a schedule after deploys or content updates.

⁠Why run it in Docker

• A scheduled, single-purpose crawler — drop it in a cron/timer or CI step; no Python/venv to maintain on the host.
• Cache stays warm — first-visitor latency disappears because the cache is already populated.
• Pairs with indexing automation — warm the cache, then ping search engines (see the Instant Indexing article below).
• Hardened, minimal base. See Docker Hardening for Self-Hosters⁠.

⁠Hardened docker-compose.yml

services:
  sitemap-warmup:
    image: eilandert/sitemap_warmup:latest
    read_only: true
    cap_drop: [ALL]
    security_opt:
      - no-new-privileges:true
    command: ["https://example.com/sitemap_index.xml"]
    restart: "no"        # run on demand / from a scheduler

Run it from cron after a deploy:

docker run --rm eilandert/sitemap_warmup:latest https://example.com/sitemap_index.xml

⁠Links

• Pair it with search-engine pinging: Google Instant Indexing API for WordPress⁠
• All Docker images: https://deb.myguard.nl/nginx-dockerized/⁠
• Package repo & articles: https://deb.myguard.nl⁠
• Docker hardening guide: https://deb.myguard.nl/2026/05/docker-hardening-rootless-readonly-distroless/⁠
• Source: https://github.com/eilandert/dockerized⁠
• Discord: https://discord.gg/UQNsFg2y⁠