Dev/Varnish

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Varnish Cheat Sheet

For Varnish 4.

Show most requested URLs from backend

varnishtop -i BereqURL

Show specific requested URLs from backend

varnishlog -q 'BereqURL ~ "^/forum/Themes/default/scripts/"

Show requests for single URL

varnishlog -q 'ReqURL ~ "^/wiki/Translatetest"'

Show backend responses

varnishlog -g request -q "RespStatus eq 503"

varnishlog -g request -q "BerespStatus eq 503"

HTTP Purges

curl -X "PURGE / HTTP/1.0" 127.0.0.1:6081/adrelanos.asc
or: curl --head -X "PURGE / HTTP/1.0" 127.0.0.1:6081/adrelanos.asc
check (Resets Age in http header to 0.): curl --head https://www.whonix.org/adrelanos.asc

Show HTTP requests

varnishlog -q "ReqMethod eq PURGE"

Show HTTP purges

varnishlog -q "VCL_return eq purge"

Ban single URL

varnishadm 'ban req.url ~ "/adrelanos.asc"'

varnishadm 'ban req.url ~ "/wiki/Translatetest"'

Ban all URLs

varnishadm 'ban req.url ~ "."'

Show how many connections are currently open

netstat -anp | grep :443 | grep ESTABLISHED | wc -l

wordpress Total Cache varnish setup

wordpress -> Performance (on the side) -> General Settings -> Reverse Proxy
127.0.0.1:6081 run in shell: varnishlog -q "VCL_return eq purge"
test: wordpress -> Performance (at the top) -> empty all cache

list of all variables such as client.ip

https://www.varnish-cache.org/docs/trunk/reference/vcl.html

default built-in vcl

https://www.varnish-cache.org/trac/browser/bin/varnishd/builtin.vcl?rev=4.0

Show nuked items

Elements that have been removed from cache due to lack of memory.

varnishstat -1 -f MAIN.n_lru_nuked

whonix.org

/etc/default/varnish

## Patrick: changed from
## -s malloc,256m
## to
## -s malloc,8G

varnish advantages

• devicedetect.vcl for mobile devices for mediawiki

Feature Requests

• phabricator - integration with reverse caching proxies such as squid, varnish

Debugging

• https://www.whonix.org/wiki/Main_Page?action=purge
• see if purge request is registered
• https://www.mediawiki.org/wiki/Manual:Purge

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