Where does Kirby store its logs?

Kirby 3
1

(Or maybe the question is: how do I configure php-fpm to log Kirby errors?)

I’m running Kirby 3 behind nginx using php-fpm on Ubuntu 20.04.

I recently ran into a “This page is currently offline due to an unexpected error” error message and wanted to see what the problem was without having to turn on debug mode.

I’ve looked in /var/log/php7.4-fpm.log, /var/log/syslog, /var/log/nginx/error.log but found nothing.

2

Maybe this helps, has nothing to do with Kirby but with your PHP configuration:

https://www.php.net/manual/en/install.fpm.configuration.php

3

Hm, the config has (among other things):

error_log = /var/log/php7.4-fpm.log
log_level = notice

Shouldn’t this mean that - if Kirby is logging errors (I take from your comment that it does so by default?) - I should see error messages in /var/log/php7.4-fpm.log? Yet it’s empty…

4

This has nothing to do with Kirby but with PHP, you need to tell PHP to log errors

https://www.php.net/manual/de/function.error-reporting.php

5

Strange. I must be missing something obvious.

/etc/php/7.4/fpm/php.ini has:

error_reporting = E_ALL & ~E_DEPRECATED & ~E_STRICT
log_errors = On

Still, no logs anywhere I can see. (I have a page that throws an error, so there should be something…)

6

You can briefly set the debug option to true in your config, but that is no permanent solution, of course.

7

Did some more testing and I think this might be an issue with Kirby after all. Using plain PHP (no Kirby) with my existing PHP settings, I can get errors logged just fine!

Any help with this would be hugely appreciated.

Without Kirby

If I use this nginx config:

server {
  listen 80 default_server;
  root /var/www/html;

  location / {
    try_files $uri $uri/ /index.php$is_args$args;
  }

  location /index.php {
    include      snippets/fastcgi-php.conf;
    fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
  }
}

And put this file in /var/www/html/index.php:

<?= noSuchFunction() ?>

Then, when I run curl localhost/index.php, I get the following output in /var/log/nginx/error.log:

2021/03/03 10:58:18 [error] 31857#31857: *1 FastCGI sent in stderr: "PHP message: PHP Fatal error:  Uncaught Error: Call to undefined function noSuchFunction() in /var/www/html/index.php:1
Stack trace:
#0 {main}
  thrown in /var/www/html/index.php on line 1" while reading response header from upstream, client: 127.0.0.1, server: , request: "GET /index.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php7.4-fpm.sock:", host: "localhost"

Nice!

With Kirby

If I now try to reproduce this with Kirby, I still don’t get any error logs.

Keeping the same nginx config, I put this in /var/www/html/site/templates/home.php

<?= noSuchFunction() ?>

Now when I run curl localhost/home, I get a 500 error repsonse, but no output regarding the error in the nginx error log or anywhere else.

My current Kirby config, in case it’s relevant:

<?php
return [
  'auth' => [
    'methods' => 'code'
  ],
  'cache' => [
    'pages' => [
      'active' => false
    ]
  ],
  'languages' => true,
  'panel' => [
    'install' => true
  ]
];