Created attachment 63948 [details] koha-error.log: error messages with description of related steps to upload cover image Uploading a cover image failed without an error in UI, error message "no cover image available" is shown in the catalogue entries. There are error messages in koha-error.log but this messages are shown for every step (see the described steps in attachment): - open the administration site - go to "tools|catalogue|upload cover images" - upload a cover image This error a duplicate with every try uploading a cover image.
Additional system informations: Koha-Version: 16.11.06.000 OS Version: Linux 4.11.3-200.fc25.x86_64 Perl-Version: 5.024001 MySQL-Version: mysql Ver 15.1 Distrib 10.1.21-MariaDB, for Linux (x86_64) using readline 5.1
Could you confirm this is still valid? It certainly because the connection to the DBMS was lost.
This is still valid. The error message confirm the lost of communication between DBMS and application. But I didn't find any reason why.
You should take a look at https://dev.mysql.com/doc/refman/5.7/en/gone-away.html
I solved this issue by reinstallation of the mysql server. The reason of this bug I cant't describe, this should be a problem of filesystem permissions. I think, the cover file will temporarily uploaded into an file system and imported by mysql into the database. When there's a problem with the access to the cover file per mysql, mysql can't import the file into the database. But, I don't know, there's a temporary place during the file upload and where is it? Ergo: After reinstallation of mysql the cover file upload works fine.