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.