How To: Setup WordPress Cluster on LightSail using Percona and Unison

In this video we will walk-through setting up a WordPress cluster environment using LightSail instances. This follows a tutorial by David Hilditch (link below). His tutorial is based on Digital Ocean droplets, but we will be doing the same setup using AWS LightSail instances.
We will be setting up a 3-instance cluster, each cluster will have WordPress along with the database and media files on the server itself.
We will use two different replication tools. For the database we will setup Percona for MySQL and for the Files we'll use a sync tool called Unison. We will then have a 4th LightSail instance that will setup as a load balancer. If you want you can alternatively use the LightSail load balancer.

This is a neat project but it does require some sysadmin experience and a bit advanced server setup knowledge. If you follow the exact instructions it should all work but in case you run into issues you'll have to troubleshoot it.

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Link to post details: https://www.webhostingforbeginners.net/how-to-setup-a-wordpress-cluster-on-lightsail-using-percona-and-unison/

All the commands and instructions are in my GitHub Gist and Wiki:
https://gist.github.com/mukeshwani/2bf1bb85c3f762d04044f1d5906b8a40
GitHub with NGinx Configuration Files and Diagrams
https://github.com/mukeshwani/lightsail-wordpress-cluster

Link to David Hildhitch's tutorial on Dream Ocean:
https://www.wpintense.com/2018/01/09/setting-up-a-wordpress-cluster-for-huge-sites/

Video Chapter Index:
00:00 - Intro
00:59 - Lightsail WordPress Cluster Diagram Review
04:44 - Create Lightsail Instances
06:30 - Firewall Ports for Load Balancer
08:13 - Install Percona DB XtraDB Cluster
11:40 - Setup MySQL
13:14 - Create Replication Users
15:30 - Setup Replication Configuration
20:34 - Startup MySQL Cluster
22:21 - Install NGINX & PHP
23:25 - Install Unison File Replication
23:47 - Setup SSH between all servers
29:43 - Authenticate SSH between all servers
32:24 - Setup Unison Replication
34:43 - Setup Unison Cron Job
36:08 - Fetch WordPress Files
38:05 - Configure Nginx
43:06 - Review and Explain Steps
44:00 - Setup Load Balancer with Lightsail Nginx instance
48:13 - Install CertBot & Setup Let's Encrypt SSL Certificate
49:59 - DNS Update for Domain
51:55 - Update Load Balancer Configuration with SSL
53:56 - Create Empty Database for WordPress
55:32 - Install & Setup WordPress
57:57 - Disable WP Cron and Set up WordPress Cron on only WP server 1

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