This video by Thijs Feryn is an in-depth varnishlog tutorial. It's based on the following blog post: [ Ссылка ]

varnishlog is a binary that reads from the Varnish Shared Memory Log and displays information about a running Varnish instance. It displays payload information about HTTP request and responses, , but also visualizes potential interaction with your backend.

By using varnishlog the right way, you'll be able to determine the entire trajectory within the Varnish finite state machine: you'll see the different actions that were taken, the transitions to other stages, and possible alterations to headers and payload.

Here's a list of the items that are discussed in the video:

- 0:22 What is varnishlog?
- 0:36 The Varnish Shared Memory Log
- 01:45 Transactions & transaction grouping
- 10:28 The VCL flow
- 12:00 Varnishlog tags
- 27:43 Tag filtering
- 33:03 VSL queries
- 35:57 Miscellaneous command line options
- 37:44 What is varnishtop?
- 38:49 Why didn't Varnish cache? The meaning
- 43:17 Summary

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