Varnish Cache is a powerful, open-source front-end web accelerator designed to optimize the speed and performance of content-heavy dynamic web sites and APIs. By caching content in memory, Varnish significantly reduces the response time and network bandwidth consumption, leading to faster load times and a smoother user experience. It acts as a reverse proxy, sitting in front of a web server, and decides whether to serve content from the cache or forward the request to the backend server for fresh content.

One of Varnish Cache's standout features is its flexibility, provided by the Varnish Configuration Language (VCL), which allows developers to write policies on how incoming requests should be handled and responses should be cached. This level of control enables highly tailored caching strategies that can dramatically improve the efficiency and scalability of web services.

Varnish Cache is renowned for its ability to handle massive volumes of concurrent requests, making it an ideal solution for high-traffic websites looking to maintain optimal performance during peak load times. Its efficient use of system resources, combined with its ability to accelerate content delivery, makes Varnish Cache a popular choice among content delivery networks (CDNs) and large-scale web applications seeking to enhance user satisfaction and engagement through improved web performance.

Integrating Varnish with groundcover

To start accessing granular insights, just follow these 2 super easy steps:

Step 1: Enable Custom Metrics

Follow our quick guide on how to enable scraping custom metrics on groundcover.

Step 2: Import dashboard using Grafana ID

In the groundcover platform, go to Dashboards -> New -> Import.

In the box titled "Import via", enter one of the following dashboard IDs, then click "Load".

IDNameDescriptionMore Info



A dashboard to use to debug a running varnish instance. Easily track requests, cache hits, network i/o, sessions, threads, bans, ban lurker and the ban list size


Varnish Overview

Performance Metrics for Varnish Cache



Performance Metrics for Varnish Cache

That's it!

You can now see the imported dashboard in your list of Dashboards and start using it immediately.

You can repeat this action to load as many of these dashboards as you like.

If you import more than one of these dashboards, you may find it useful to create a Varnish Dashboards Folder in groundcover.

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