Back Office unavailable, blank page or 500 error

[bekway]

Our BO returns a 500 error in newly migrated website. We switched on debug in Defines.inc and get the following alert:

Quote

RuntimeException

Unable to write in the logs directory (/var/www/vhosts/perrytaylor.fr/perrytaylor.eu/var/logs)

in Kernel.php line 769

at Kernel->buildContainer()in Kernel.php line 643

at Kernel->initializeContainer()in Kernel.php line 136

at Kernel->boot()in Kernel.php line 196

at Kernel->handle(object(Request), 1, false)in index.php line 82

Front end works perfectly..

We tried changing php (versions 7.2.28, 7.2.34, 7.1.33) same result.
We emptied var/cache/dev and /prod same result
We increased PHP memory, same result
We changed permissions of /var/logs/, same result
We tried disabling modules manually, same result

Any other suggestions??

PS 1.7.7 CentOS7

[musicmaster]

Ownership?

Rights issues are often related to the fact that root or a user is owner of a directory instead of www-data.

Use "chown" to change it.

[bekway]

Hi Musicmaster, yes I already thought of this. Prestashop writes to /var/cache/ which has exactly the same owner, group and permissions as /var/logs so it must be something else.

[bekway]

I have solved this error. I installed a fresh version of Prestashop in a sub-folder. I deleted the troublesome /var folder and replaced it with the new one from the sub-folder.

Permissions and ownerships were identical on both /var folders. If anyone has an explanation I am interested, we lost several days trying to understand this one, nothing in the logs except above quote.

[musicmaster]

A blind guess: a hidden file with the name "logs".