[Koha] Help debugging Internal Server Error

[Doug Dearden]

Hey Everyone,

I did an upgrade today on our server.  We were running version 19.05 on stretch, and we needed to upgrade to buster and I decided to get up to the latest stable Koha release at the same time.  The upgrade seemed to go OK but now when I go to our OPAC and do a search I get no results, and if I click on a link for recently added items I get an internal server error.  There are some Perl Modules showing as not installed -  Locale::XGettext::TT2 , Text::CSV::Unicode , Selenium::Remote::Driver , Test::DBIx::Class, HTTPD::Bench::ApacheBench .  There was a warning on the System Information tab about the <lockdir> not being defined in koha-conf.xml so I added that to the config section in there and that warning is now gone.  I thought this might be related to plack.  If I enter
koha-plack -stop <instance>
it returns
Stopping Plack daemon for <instance>
When I enter koha-plack -disable <instance>
it returns
Plack not disabled for <instance> OPAC
Plack not disabled for <instance> Intranet
With Plack stopped the error changes to Service Unavailable

I tried commenting out the Include /etc/koha/apache-shared-opac-plack.conf line from the apache config and restarting apache, but still got Service Unavailable .

/var/log/koha/<instance>/opac-error.log shows this repeatedly
[Wed Feb 17 17:03:58.912977 2021] [proxy_http:error] [pid 4810] [client 185.191.171.3:37140] AH01114: HTTP: failed to make connection to backend: httpd-UDS

I'm not really sure what logs I should be looking at to troubleshoot this.

Thanks,

Doug Dearden
Director / Information Technology
School for Advanced Research (SAR)
PO Box 2188 / Santa Fe / NM / 87504-2188
505-954-7220 (work) / 505-690-1535 (cell)
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