Install Letsencrypt how to install wordpress with ssl & cache

In context of Wordpress caching for centmin.sh menu option 22 wordpress auto installer for Centmin Mod 123.09beta01 and newer, you have 3 offered wordpress caching options:

1. Redis Nginx Level Caching - centmin.sh menu option 22 will auto install redis if not detected if you choose this in centmin.sh menu option 22 setup. Otherwise, need to install redis yourself. Best combined with Autoptimize WP plugin
2. KeyCDN Cache Enabler for full page static html caching (safest choice for balance of performance and reliability). Best combined with Autoptimize WP plugin
3. WP Super Cache for full page static html caching. Best combined with Autoptimize WP plugin

1. redis caching at nginx level can be fastest but needs fine tuning and deep understanding of your web app and it's plugins to get right i.e. woocommerce etc. So can be problematic too. Most caching is are for guest caching only.

2. keycdn cache enabler wp plugin - better version of wp super cache for full page static caching of wordpress. Least problematic and closest to set and forget with maybe some tuning needed depending on wp plugins and site configuration. Config is for guest caching only.

And regardless of caching method, having right server(s) hardware and configuration and LEMP stack and system TCP level configurations to handle the traffic is a must otherwise regardless of caching used, it won't scale. So you would want non-OpenVZ based VPS like KVM or dedicated. Choosing OpenVZ VPS will limit your scalability.

FYI, all caching methods = generally higher memory consumption and sometimes higher cache related cpu consumption. The goal of caching in context of wordpress is usually to lessen the load placed on php/php-fpm as that is the weakest part of any LEMP/LAMP setup in terms of scalability. So sometimes caching isn't necessary faster just scales better in high concurrent traffic environments.

You can see centmin.sh menu option 22 wordpress installed demo and benchmarks on my Wordpress7 demo site.

As to SSL, there's generally 3 ways of setting up HTTPS SSL certificate for Centmin Mod Nginx HTTP/2 based HTTPS

Method 1. The traditional way via centmin.sh menu option 2, 22 but ensuring you set LETSENCRYPT_DETECT='y' in persistent config file created at /etc/centminmod/custom_config.inc before you run centmin.sh menu option 2 or 22 for wordpress. You can do that using command below - only need to do this step once and every subsequent run of centmin.sh menu option 2 or 22 will have letsencrypt ssl certificate support enabled

Code (Text):

# enable letsencrypt ssl certificate integration https://centminmod.com/acmetool/
touch /etc/centminmod/custom_config.inc
echo "LETSENCRYPT_DETECT='y'" >> /etc/centminmod/custom_config.inc

Method 2. Using and testing Centmin Mod 123.09beta01's new addons/acmetool.sh addon which is still in beta testing only for integrating Letsencrypt SSL certificates. And has both auto and manual methods.

Method 3. Fully manual method for free Letsencrypt SSL certificates.

• For existing non-HTTPS Nginx vhost sites migration to HTTPS as outlined at Migrating Existing Nginx Vhost From HTTP to HTTP/2 based HTTPS With Letsencrypt SSL Certificates
• For brand new Nginx vhosts not yet created on server use this guide Using Centmin Mod acmetool.sh addon for Nginx HTTP/2 based HTTPS with free Letsencrypt SSL certificates