config apache2 for phpmyadmin behind HAproxy - php

Question

I'm looking looking for solving my problem, but still I cannot solve it...
I have a firewall (pfsense) in a cloud VM on which I have a reverse proxy (HAproxy) for balancing and offload https on 2 backend servers.
These 2 servers are classic LAMP (Ubuntu Apache2 2.4.53, PHP 7.4, MySQL)
I 'm using phpmyadmin on a different port (let's say 1234), and I'm using the same domain (example.com) on the reverse proxy which balance to lamp1 or lamp2 depend which address :
example.com:1234/phpmyadmin1 => LAMP1
example.com:1234/phpmyadmin2 => LAMP2
All of that works nice, but as I'm still learning, I made mistakes that I realized after few months. I could use php-fpm instead php-mod, I would like to use php8.1 and php7.4 and big mistake my Ubuntu version was 21.04 (yes I stupidly mistake with the LTS...)
So for doing all of that, I finally decide to start a fresh install on a new VM : LAMP3
I have my new LAMP3 with phpmyadmin, I followed DigitalOcean tuto for PHP-FPM, tested with simple web page, I can switch to php8.1 or php7.4. Everything sounds good.
Now I would like to integrate the LAMP3 in the reverse proxy in order to redirect example.com:1234/phpmyadmin3 to my phpmyadmin
When I'm on the VPN I can try http://10.0.0.3:1234/phpmyadmin3 and it works.
But when I try from internet with https://example.com:1234/phpmyadmin3 , I have on error 404 Not Found .
This error 404 mean I'm on the server and not on the reverse proxy. so I'm redirected to the right place.
I changed the config for using original alias (/phpmyadmin) and update it on the reverse proxy. Guess what, it's working ! And I'm sure it's LAMP3 because I have php8.1 for phpmyadmin (that I don't on the 2 others LAMP)
I tried with include the default phpmyamin in the virtualhost, but I prefer having all in 1 place so I made a virtualhost phpmyadmin.conf with all info (see below)
I disable phpmyadmin in apache conf (a2disconf phpmyadmin)
I tried a lot of different things into this virtualhost that now I'm getting lost
I reapeat again, but when I change the alias from /phpmyadmin3 to /phpmyadmin everything works as it should.
So why, where how to solve that ?
What's wrong with my alias ?
phpmyadmin.conf
<VirtualHost *:17380>
ServerName localhost
Alias /phpmyadmin3 /usr/share/phpmyadmin
DocumentRoot /usr/share/phpmyadmin
DirectoryIndex index.php
<Directory /usr/share/phpmyadmin>
Options FollowSymLinks
AllowOverride All
Order allow,deny
allow from all
Require all granted
</Directory>
<Directory /usr/share/phpmyadmin/templates>
Require all denied
</Directory>
<Directory /usr/share/phpmyadmin/libraries>
Require all denied
</Directory>
<FilesMatch \.php$>
SetHandler "proxy:unix:/run/php/php8.1-fpm.sock|fcgi://localhost"
</FilesMatch>
ErrorLog ${APACHE_LOG_DIR}/phpmyadmin.error.log
CustomLog ${APACHE_LOG_DIR}/phpmyadmin.access.log combined
</VirtualHost>
VirtualHost *:17380>
ServerName example.com
Alias /phpmyadmin3 /usr/share/phpmyadmin
DocumentRoot /usr/share/phpmyadmin
DirectoryIndex index.php
<Directory /usr/share/phpmyadmin>
Options FollowSymLinks
AllowOverride All
Order allow,deny
allow from all
Require all granted
</Directory>
<Directory /usr/share/phpmyadmin/templates>
Require all denied
</Directory>
<Directory /usr/share/phpmyadmin/libraries>
Require all denied
</Directory>
<FilesMatch \.php$>
SetHandler "proxy:unix:/run/php/php8.1-fpm.sock|fcgi://localhost"
</FilesMatch>
ErrorLog ${APACHE_LOG_DIR}/phpmyadmin.error.log
CustomLog ${APACHE_LOG_DIR}/phpmyadmin.access.log combined
</VirtualHost>
Versions
Ubuntu 22.04
apache 2.4.53
mysql 5.7.38
php-fpm7.4
php-fpm8.1

Answer 1

I kind if solve my problem...
Instead of using the alias /phpmyadmin3 , I tried with alias /pma3 and /test
And it works !
Soooo... I guess it's something with cache on my server ?
Not with my browser as I tried from different PC with different browser in private mode.
Solve I guess