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Varnish Troubleshoot

varnishtop

# most often-made requests to the backend:
varnishtop -b -i TxURL
varnishtop -i rxurl

# Client Encoding type
varnishtop -i RxHeader -I Accept-Encoding

# Show User Agents accessing your server through Varnish:
varnishtop -i RxHeader -I ^User-Agent

varnishlog

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# Varnish adds a Age header to indicate how long the object has
varnishlog -i TxHeader -I ^Age

# Varnish grep status Code 503
varnishlog -m TxStatus:503

# To see the client requests
varnishlog -c -m ReqStart:$CLIENTIP

# To see the backend requests, match on the TxHeader.
varnishlog -b -m TxHeader:$BACKENDIIP

varnishhist

# histogram for the past 1000 requests, cache hits (denoted by a ‘|’) and misses (denoted by a ‘#’),

varnishhist