Varnish is a reverse web proxy accelerator that caches the HTTP contents. It can speed up requests by a factor of 500-1000 times. By caching and saving CPU time and database requests for content, varnish is able to server hundreds of consecutive requests per second.
The need for varnish cache is to boost up the loading speed of your website and reduce the load on servers.
It is also possible that when a website has new content, showing you the cached results would be irritating and annoying.
It is a web application accelerator that is also commonly known as caching HTTP reverse proxy.
It really works fast and boosts up the speed of loading a website, which all depends on server architecture.
Purging can only be possible when you select an object and discard it.
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In order to purge or clear Varnish cache, you can simply restart Varnish. This will clear the varnish cache.
/etc/varnish restartor if you are using 'services' on your server, you can run the following on the command line
service varnish restartIn order to purge varnish cache for a specific URL, using CURL :
curl -X PURGE URL-to-PURGERunning this command should provide an output like this :
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title>200 Varnish cache has been purged for this object.</title>
</head>
<body>
<h1>Error 200 Varnish cache has been purged for this object.</h1>
<p>Varnish cache has been purged for this object.</p>
<h3>Guru Meditation:</h3>
<p>XID: 1398586940</p>
<hr>
<p>Varnish cache server</p> <script defer src="https://www.wpoven.com/wp-content/cache/autoptimize/js/autoptimize_c40deb9a4fcff35750a05475f2b8ca96.js"></script></body>
</html>
Clearing the varnish cache for a specific URL using varnishadm
To open the varnishadm console. use the following command to purge the URL http://www.example.com/some/url :
varnishadm -T 127.0.0.1:6082 -S /etc/varnish/secret ban "req.http.host == example.com && req.url == /some/url/"