CODEWITHSUNDEEP
varnishvarnish-vcl
rangfu
rangfu

Reputation: 8977

How can I view the contents of Varnish's hash_data()?

I know that in Varnish you can add data to the cache hash using hash_data() within vcl_hash, as per the docs.

For debugging purposes, I would like to be able to see the entire contents of whatever is making up the hash.

For example, it would be really useful if we could do:

 # This won't work:
 set req.http.X-DEBUG = "HASH-DATA:" + hash_data();

Does anyone know if this is possible?

Upvotes: 6

Views: 3658

Answers (2)

ciencia
ciencia

Reputation: 496

You can usually see it with the varnishlog command.

However, since varnish 5 you need to enable the hash specifically in the log output. This can be done with the varnishadm utility:

Execute varnishadm and on the prompt it starts, type:

varnish> param.set vsl_mask +Hash

you can exit the shell by typing quit, and then run varnishlog again, it should display the hash used on each request now.

Upvotes: 11

Debreczeni András
Debreczeni András

Reputation: 1678

varnishlog properly explains what hash data is used for a specific request.

You can redirect the varnishlog output to your custom file for further review:

varnishlog > my-log.log

Upvotes: 1

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