Hello, any ideas what could cause 500 error when i am changing php version to 7.3 or higher?
Forum runs on CentOS 8, Webmin/Virtualmin. By default highest php version was 7.2.24 and i installed 7.3, 7.4 and 8.0

dnf -y install http://rpms.remirepo.net/enterprise/remi-release-8.rpm && dnf clean all

dnf -y install php73-php-{cli,pdo,fpm,zip,gd,xml,mysqlnd}
dnf -y install php74-php-{cli,pdo,fpm,zip,gd,xml,mysqlnd}
dnf -y install php80-php-{cli,pdo,fpm,zip,gd,xml,mysqlnd}

But forum runs only on default 7.2.24. I am new to CentOS, Webmin/Virtualmin, so maybe there are some settings i should change after installing PHP?

500 errors are server side errors. What does your error log say?

[Tue Dec 29 13:43:37.583029 2020] [proxy_fcgi:error] [pid 98840:tid 140551026292480] [client xx.xxx.xxx.xxxx:62371] AH01071: Got error 'PHP message: PHP Fatal error:  Uncaught Error: Call to undefined function IPS\\mb_internal_encoding() in /home/xxxxxxxx/public_html/init.php:541\nStack trace:\n#0 /home/xxxxxxxx/public_html/init.php(1532): IPS\\IPS::init()\n#1 /home/xxxxxxxx/public_html/index.php(12): require_once('/home/xxxxxxxx...')\n#2 {main}\n  thrown in /home/xxxxxxx/public_html/init.php on line 541\n'

Your new PHP version is missing the mbstring extension, it may be missing more too. I would recommend running the compatibility checker - 

Note: PHP 8.0 is not supported at this time.

Installed mbstring extension and now forum works. Thank you.

Had to run: dnf install php-mbstring

And then:   dnf install php72-php-mbstring for 7.2 php73 for 7.3 and so on

And here is result from checker and seems that everything else is fine.

 

 

 

While this version is compatible, we recommend version 5.6.2 or above...

If v8.0 for php is not supported, then what is highest supported (recommended) for MySQL/MariaDB?

@Jurgis7.3 and 7.4 is supported

You tried to disable HTACCESS ?

About database you have change to InnoDB

 

On 1/24/2021 at 5:36 AM, MEVi said:

You tried to disable HTACCESS ?

About database you have change to InnoDB

Problem solved. PHP version was missing the mbstring extension.