# Architecture

## Current map

Last checked: 7 July 2026.

This page is the working architecture note for the CAUK web estate. Use it when changing hosting, DNS, email, redirects, or the docs service.

| Area | Current setup |
| --- | --- |
| Main website | `cocaineanonymous.org.uk` and `www.cocaineanonymous.org.uk` are on Krystal. |
| Legacy/short domain | `cauk.org.uk` has a permanent 301 redirect to `https://www.cocaineanonymous.org.uk/`. |
| Email | `cauk.org.uk` email is on LCN. Do not change the LCN mail records during website DNS work unless an email migration is planned. |
| Documentation | `docs.cocaineanonymous.org.uk` runs BookStack on the CAUK VPS at `217.174.245.120`, behind Nginx and Docker. |

## WordPress sites

The public WordPress estate uses separate WordPress installs for the main site and key subdomains. It is not a single WordPress Multisite for the main CAUK domains.

Known public sites:

- `www.cocaineanonymous.org.uk`: main CAUK area site.
- `meetings.cocaineanonymous.org.uk`: meeting directory.
- `events.cocaineanonymous.org.uk`: events calendar.
- `shop.cocaineanonymous.org.uk`: literature shop.
- `forms.cocaineanonymous.org.uk`: central forms.

Old SiteGround references should be treated as stale unless a newer page says otherwise.

## DNS and redirect checks

Checks from 7 July 2026:

- `https://cauk.org.uk` returns `301` to `https://www.cocaineanonymous.org.uk/`.
- `MX cauk.org.uk` returns `mx0.lcn.com` and `mx1.lcn.com`.
- `A cauk.org.uk` resolves to `77.72.2.156`.
- Reverse DNS for `77.72.2.156` points to `p156.lon.krystal.io`.

## Docs service

The docs site is separate from the WordPress estate.

- Public URL: `https://docs.cocaineanonymous.org.uk`.
- App: BookStack.
- Host: CAUK VPS at `217.174.245.120`.
- Reverse proxy: Nginx.
- Containers: BookStack and MariaDB under `/opt/bookstack`.

Backups for BookStack are handled on the VPS. Do not store credentials or backup keys in public pages.