Varnish Dev Ops

varnish administration.txt

# clear the entire cache
varnishadm "ban req.url ~ /"

# monitor varnish stats
varnishstat -n prod

# monitor varnish log with multiple patterns
varnishlog | grep 'eqURL\|Age:\|VCL_call\|TTL\|Expires:\|Cache-Control:'

# Use a query with varnishlog to watch requests from a specific IP
varnishlog -q 'ReqHeader:X-User-IP eq "1.2.3.4" or BereqHeader:X-User-IP eq "1.2.3.4"' 

# Use a query to watch requests to a specific path
varnishlog -n prod -q 'ReqURL eq "/product_page.html" or BereqURL eq "/product_page.html"'

# Watch for a MISS
varnishlog -n prod -q 'VCL_call eq "MISS"'


# Monitor PURGE requests hitting Varnish
varnishlog -n prod -q 'ReqMethod eq "PURGE"'
varnishlog -n prod -q 'ReqMethod eq "PURGE"' | grep 'X-Magento-Tags-Pattern\|X-Pool'

# determine the instance names of multiple varnish instances
ls -la /var/lib/varnish/

# use varnish log against a specific instance name
varnishlog -n stage

# purge request using curl from the local machine
curl -s -H 'X-Pool: prod' -X PURGE http://127.0.0.1:6081/

# Check config. If a syntax error exists it will produce an error, otherwise it will output the configuration
varnishd -C -f /etc/varnish/default.vcl