Different PHP Pool for WP-Admin

[Dante]

1. Output of caddy version:

v2.6.2 h1:wKoFIxpmOJLGl3QXoo6PNbYvGW4xLEgo32GPBEjWL8o=

2. How I run Caddy:

a. System environment:

Debian Sid, Caddy installed from official repo

c. Service/unit/compose file:

# caddy.service
#
# For using Caddy with a config file.
#
# Make sure the ExecStart and ExecReload commands are correct
# for your installation.
#
# See https://caddyserver.com/docs/install for instructions.
#
# WARNING: This service does not use the --resume flag, so if you
# use the API to make changes, they will be overwritten by the
# Caddyfile next time the service is restarted. If you intend to
# use Caddy's API to configure it, add the --resume flag to the
# `caddy run` command or use the caddy-api.service file instead.

[Unit]
Description=Caddy
Documentation=https://caddyserver.com/docs/
After=network.target network-online.target
Requires=network-online.target

[Service]
Type=notify
User=www-data
Group=www-data
ExecStart=/usr/bin/caddy run --environ --config /etc/caddy/Caddyfile
ExecReload=/usr/bin/caddy reload --config /etc/caddy/Caddyfile --force
TimeoutStopSec=5s
LimitNOFILE=1048576
LimitNPROC=512
PrivateDevices=yes
PrivateTmp=true
ProtectSystem=full
AmbientCapabilities=CAP_NET_BIND_SERVICE

[Install]
WantedBy=multi-user.target

d. My complete Caddy config:

{
	storage file_system /var/www/caddy
    on_demand_tls {
        interval 2m
        burst    5
    }
}

https:// {
    tls {
        on_demand
    }

    root * /var/www/{host}/htdocs/
    
    php_fastcgi unix//run/php/php8.2-fpm.sock
    php_fastcgi /wp-admin/* unix//run/php/php-admin.sock

    file_server {
		precompressed br
    }

    encode gzip

    header /* {
        -Server
    }

    @cache {
	not header_regexp Cookie "comment_author|wordpress_[a-f0-9]+|wp-postpass|wordpress_logged_in"
	not path_regexp "(/wp-admin/|/xmlrpc.php|/wp-(app|cron|login|register|mail).php|wp-.*.php|/feed/|index.php|wp-comments-popup.php|wp-links-opml.php|wp-locations.php|sitemap(index)?.xml|[a-z0-9-]+-sitemap([0-9]+)?.xml)"
	not method POST
	not expression {query} != ''
    }

    route @cache {
        try_files /wp-content/cache/cache-enabler/{host}{uri}/https-index.html /wp-content/cache/cache-enabler/{host}{uri}/index.html {path} {path}/index.php?{query}
    }	

    @disallowed {
        path /xmlrpc.php
        path /wp/xmlrpc.php
        path *.sql
        path /wp-content/uploads/*.php
    }

    rewrite @disallowed '/index.php'
}

3. The problem I’m having:

I am trying to use two php-fpm pools for my sites. One for the front-end and another for Wordpress Admin Area. I have added two fastcgi config in the Caddyfile to achieve the same. But it’s not working. The default pool values are still being used all across. I am trying to achieve what this article did but for the whole wp-admin area and not just for update url. Selective Elevation of PHP in Nginx+WordPress » KBeezie

I am not sure if my config is right for php_fastcgi for the admin area. I’ll appreciate some help. Thank you for the amazing work the whole team is doing on Caddy!

[francislavoie]

Please do not delete any parts of the help topic template. It’s necessary that you completely fill out the template.

We need to see what your logs look like, to see what Caddy is doing during each request.

Turn on the debug global option to see more detail in your logs.

Use curl -v to make requests, and show the headers being sent and received.

[Dante]

Thank you for your prompt reply. This seems to be working fine. Not sure if this is the best way to do it.

php_fastcgi unix//run/php/php8.2-fpm.sock

handle /wp-admin/* {
	php_fastcgi unix//run/php/php-admin.sock
}