Got Error 500 when tried to access admin page.

[FNakano]

Hi! I tried to follow the SKOS tutorial. It instructs to access ontology by clicking on configuration->admin menu item., got Error 500 (screenshot below)

This time I ran LinkedDataHub with docker-compose up 2>&1 | tee 20221006-10:03.run.log so I have a 22MB log. I can send it to you, if needed. How can I fix the error and get to admin page?

[namedgraph]

I see there was a 429 error in the log which happens when nginx receives too many requests, in this case too many stylesheets are being loaded at the same time. Can you try simple hard refresh (Ctrl+F5)? :)

[FNakano]

Thanks for your reply. Unfortunately, CTRL-F5 resulted in the same page displayed... The request was sent (a lot of messages in the terminal). I can send you a screen capture video.

[namedgraph]

docker-compose logs --tail 500 linkeddatahub > ldh.log should generate a log file with enough info.

What if you tried increasing the rate value for static_files in the platform/nginx.conf.template config file?

    limit_req_zone $binary_remote_addr zone=static_files:10m rate=20r/s;

[FNakano]

I got the logs before changing limit_req_zone $binary_remote_addr zone=static_files:10m rate=6r/s; to limit_req_zone $binary_remote_addr zone=static_files:10m rate=20r/s; and after changing it. --------------- before ldh-before.log

----------------- after ldh-after.log

[namedgraph]

The error is the same.

The file already contained zone=static_files:10m rate=20r/s? Try increasing rate to 50 or so. Also try increasing burst in limit_req zone=static_files burst=20 nodelay.

Alternatively you can try commenting out limit_req_zone statements altogether and see if that helps.

[FNakano]

Hi! .... it was 6. I tried increasing it to 20. This time I increased it from 20 to 100, resulting in limit_req_zone $binary_remote_addr zone=static_files:10m rate=100r/s;. It solved the error 500. I will keep trying LinkedDataHub. Thanks for your help.

[namedgraph]

@FNakano can you tell us something about your use case, if any?

[FNakano]

I apologize to take so long to answer... I'm interested to apply knowledge graphs/knowledge enrichment on sensor data and use it to suggestion/decision making... also some kind of (semi-)automatic document generation (using SKOS, Dublin Core, ...)