This was causing the error: ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
And has now been resolved.

The Guide: https://www.samueldowling.com/2020/...n-freenas-iocage-jail-with-hardened-security/

This guide will show you how to manually set up and configure a Nextcloud server in an iocage jail, as well as how to harden your security to make sure your information is safe. Specifically, this guide covers:

• Organise your datasets
• Set up and configuration of a FAMP (FreeBSD, Apache, MySQL, PHP) web server stack
• Optimise your database
• Install and configure Nextcloud to remove all security warnings and adhere to Nextcloud's suggested best practice
• Configure HTTPS (configuring a reverse proxy, and the Nextcloud specific configuration)
• Configure tamper detection
• Configure DDNS
• Guidance on upgrading and maintaining your server

Importantly, I attempt to make this beginner friendly by explaining exactly what happens in each of the commands I present, so that this is as much a way to gain familiarity with *nix configuration as it is a way to set up Nextcloud.

Changelog (22/06/2020):

• Modified installation method to use a tarball directly from Nextcloud instead of the FreeBSD package manager
• Added upgrade instructions
• Presents installation of Nextcloud 19 and PHP 7.4
• Modified to explicitly create directories within the jail before attempting to mount
• Changed SSL configuration to use an nginx reverse proxy to improve HTTPS certificate maintainability when multiple services are being managed