Just stumbled over this while looking at bug 39153. Your plack-error.log will have lots of: Error while loading /etc/koha/plack.psgi: Can't load application from file "/usr/share/koha/api/v1/app.pl": Can't open /var/log/koha/myclone/sip.log (Permission denied) at /usr/share/perl5/Log/Log4perl/Appender/File.pm line 151. Compilation failed in require at (eval 1988) line 1. Child process 5032 exited with status 13 What is the issue here? I created sip.log with owner root and mode 600.
If log4perl.conf is not found, plack.psgi does not start either: Lost of: Error while loading /etc/koha/plack.psgi: Can't load application from file "/usr/share/koha/api/v1/app.pl": Cannot open /etc/koha/sites/myclone/log4perl.conf (No such file or directory) at /usr/share/perl5/Log/Log4perl/Config/BaseConfigurator.pm line 51. Compilation failed in require at (eval 1988) line 1. Child process 6682 exited with status 2