Varnishlog. Get entries by XID

[Geoff Simmons]

On 04/10/2017 03:18 PM, Danila Vershinin wrote:
> 
> Say I have stumbled upon a "Backend Fetch Failed” page and that
> gives me an XID.
> 
> How do I easily query varnishlog for corresponding client and
> backend requests?
> 
> varnishlog -q “XID = 12345” doesn’t work

It can be done you're running Varnish 5.1:

https://www.varnish-cache.org/docs/5.1/whats-new/changes-5.1.html#vxid-in-vsl-queries

The left-hand side is named 'vxid', and remember to use '==' as the
comparison operator ('=' is an error):

$ varnishlog -q “vxid == 12345”

In versions prior to 5.1 you can use the X-Varnish header:

# client side
varnishlog -d -q 'RespHeader:X-Varnish[1] == 12345'

# backend side
varnishlog -d -q 'BereqHeader:X-Varnish == 12345'


HTH,
Geoff
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