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Architecture

Current map

Last checked: 7 July 2026. WordPress section corrected 11 August 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 is a single WordPress Multisite network covering the main site and its key subdomains. An earlier version of this page said the opposite. Corrected 11 August 2026 on the following evidence: WP Mail SMTP's system report returns WordPress MS: Yes, and all five sites below return an identical 46-plugin list with per-site activation states, which is only possible on a network install.

This matters when troubleshooting. Plugins are activated per site rather than network-wide, so a plugin can be active on one subdomain and inactive everywhere else. Check the site that actually owns the behaviour, not the main site. WP Mail SMTP and WPForms, for example, are active only on forms.cocaineanonymous.org.uk, which is why all form notification email is sent from there.

Sites in the network:

  • 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. One of them caused a twelve-day outage of all form notification email in 2026: see Outgoing email breaks when the site moves host. Read that page before any hosting change.

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.

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