varnishreplay and varnishlog

Robert Shilston rtshilston at
Sun Jan 2 19:16:46 CET 2011

I recall a question recently about the use of varnishreplay.  I've got a bug in a web application, and I know the varnish transaction ID for an offending request.  It would be handy to use varnishreplay to send this to varnish and through to the backend for testing.  However, I don't appear to be able to extract a portion from the varnishlog file into another varnishlog file.

This is the sort of command I'd like to run:

varnishlog -r /var/log/varnish/varnish.log  -c -o TxHeader 1234567890 -w /tmp/1234567890.varnishlog


varnishreplay -a localhost:80 -r /tmp/1234567890.varnishlog

I admit that I'm not running the latest code (I'm using ), but I've reviewed the changes in trac, and don't see anything similar to the above.  Has anyone got a cunning suggestion as to how I can achieve this?

Thanks, and best wishes for 2011


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