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description=Varnish is a powerful, flexible HTTP accelerator that speeds up web applications by caching content and optimizing delivery.;

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varnish cache an open source http accelerator with native tls built for the cloud native era home getting started documentation releases getting help varnish cache an open source http accelerator with native tls built for the cloud native era varnish cache is an open source http accelerator a reverse caching proxy that sits in front of your origin and serves cached responses straight from memory it terminates tls in process ships as a container and routinely serves cached responses in just three system calls getting started with varnish read the docs what is varnish cache varnish cache is a distribution of the open source vinyl cache project made for the modern cloud ready for kubernetes with built in tls support and a long term support release cadence with extra modules and tooling layered on top deploying behind https or inside a container platform this is the distribution you want how does varnish work varnish sits between clients and your origin servers requests come in over http or https varnish answers from its in memory cache when it can and proxies through to the origin when it can t this is illustrated in the diagram below a diagram that illustrates how varnish works cached objects honor the standard http cache headers and are evicted when they expire caching policy is expressed in vcl the varnish configuration language which compiles to native code and runs inside the worker this is what lets varnish handle policy decisions at line rate key features varnish has a rich set of features and capabilities which you can read about in the documentation tls termination in process https without sidecars follows http caching conventions vcl a programmable compiled configuration language official container images and helm chart for kubernetes dynamic backends with tls to origin structured logging and metrics varnishlog varnishstat free and open source bsd 2 clause performance intel and varnish software measured varnish enterprise at 1 5 tbps per server on a single cdn node the same high performance tls code now powers varnish cache on the cache hit path varnish cache is structurally lean per cached response on a stock build 3 system calls read the request poll the socket writev the response that s the entire kernel interaction no io logging varnish logs to shared memory no disk io needed 0 kernel memory operations no mmap no brk no munmap varnish never asks the kernel for a new page during cache hit traffic workspaces and mempools are pre allocated these are properties of the code not of any particular benchmark setup getting started with varnish varnish cache runs on linux and ships in container images helm charts and native packages for the major deb and rpm based distributions docker kubernetes deb rpm pull in the docker image docker pull varnish run the docker container with the standard configuration docker run rm p 80 80 name varnish varnish run the docker container with a custom vcl file docker run rm p 80 80 name varnish v pwd default vcl etc varnish default vcl ro varnish mounts default vcl into the docker container to customize the caching policies of varnish makes a varnish available on port 80 of your local machine customize the vcl vcl 4 1 backend default host origin example com port 80 this vcl change configures the backend server for varnish to forward requests to origin example com on port 80 use the v pwd default vcl etc varnish default vcl ro option in docker to mount the default vcl file and customize the caching policies of varnish learn more about deploying varnish with docker by reading the install guide install guide install the helm chart helm install varnish f values yaml oci docker io varnish varnish cache customize the values yaml file to configure the varnish helm chart run kubectl get svc varnish varnish cache to get the cluster ip address and node port of the varnish cache service other service types and ingress are also supported learn more about deploying varnish on kubernetes by reading the install guide install guide update the package list sudo apt get update configure the package registry to install varnish on debian and ubuntu linux servers curl ls https packages varnish software com varnish bootstrap deb sh sh install varnish sudo apt get install y varnish edit the varnish systemd service sudo systemctl edit full varnish change the port number and cache size in the varnish service systemd parameters execstart usr sbin varnishd a 80 a localhost 8443 proxy f etc varnish default vcl p t n varnishd pid p feature http2 s malloc 2g this systemd configuration change sets the varnish service to listen on port 80 and allocates 2gb of memory for caching open the vcl file sudo vim etc varnish default vcl customize the vcl vcl 4 1 backend default host origin example com port 80 this vcl change configures the backend server for varnish to forward requests to origin example com on port 80 restart varnish to activate the changes sudo systemctl restart varnish learn more about installing varnish on debian or ubuntu by reading the install guide install guide configure the package registry to install varnish on rpm based linux servers curl s https packages varnish software com varnish bootstrap rpm sh sh install varnish sudo yum install y varnish edit the varnish systemd service sudo systemctl edit full varnish change the port number and cache size in the varnish service systemd parameters execstart usr sbin varnishd a 80 a localhost 8443 proxy f etc varnish default vcl p t n varnishd pid p feature http2 s malloc 2g this systemd configuration change sets the varnish service to listen on port 80 and allocates 2gb of memory for caching open the vcl file sudo vim etc varnish default vcl customize the vcl vcl 4 1 backend default host origin example com port 80 this vcl change configures the backend server for varnish to forward requests to origin example com on port 80 restart varnish to activate the changes sudo systemctl restart varnish learn more about installing varnish on red hat linux and other compatible distributions by reading the install guide install guide getting help if you need help with varnish and the docs give you no clue on what to do there are several options available to you discord channel while newer and less populated than the irc channel the varnish discord server is also a good place to ask questions about configuration http vmods or anything that s even remotely related to varnish stackoverflow you can ask questions and find answers about varnish and vcl on stackoverflow using the varnish or the varnish vcl tag social media there is a varnish cache group on linkedin where you can ask and answer questions we are also available on x as varnishcache commercial support if you need more hands on assistance or specialized advice commercial support options are available through varnish software the company behind varnish get in touch with varnish software privacy policy contact us press branding varnish software wallingatan 12 111 60 stockholm organization nr 556805 6203