evictions 64u Number of valid items removed from cache to free memory for new items bytes_read 64u Total number of bytes read by this server from network bytes_written 64u Total number of bytes sent by this server to network limit_maxbytes 32u Number of bytes this server is allowed to ...
Purging the cache often needs to be done dynamically — triggered by publishing articles or updating the website. Purging also needs to be done as atomically as possible — meaning it should target the smallest possible scope, like a single resource or path. ...
Varnish cache server Simple Docker Compose example In this example we will create adocker-compose.ymlconfig specifying two containersechoserverandvarnishtheechoserveris just a small web server that will echo back everything sent to it and we use it as ourvarnishbackend. First we create a mini...
expect in stream works as it does in client or server, except that the elements compared will be different. Most of these elements will be frame specific, meaning that the last frame received on that stream must of the correct type. Here the list of keywords you can look at. GOAWAY spec...
Unlike C and Perl, the backslash (\) character has no special meaning in strings in VCL, so it can be freely used in regular expressions without doubling. Assignments are introduced with the set keyword. There are no user- defined variables; values can only be assigned to variables attached...
The IPv4 and IPv6 options are used by routers in DNS routing towards the agents. These IP addresses will be specified in the DNS records if the routers act as DNS backends to PowerDNS. Meaning that a domain lookup is made and the agent is healthy, these IP addresses will be returned ba...
...and /path/to/page, along with all its images, CSS files, JavaScript files, and other external accoutrements, will be purged from Varnish's cache. As a bonus, this action is multithreaded, meaning even resource-heavy pages should purge quickly and evenly. This action requires your VCL to...
The technical term for Varnish is a "reverse proxy cache", meaning that it handles the requests when you visit a website acting as a cached layer of content on top of Apache. This means that after a page has been requested once from the web server, Varnish keeps a copy of that file ...
meaning the token was valid, it’ll also return a custom header containing the path to the file. Varnish will use that file path to check if the file is in its cache. If not then it’ll make another request to the other backend server to retrieve the file, cache it, then serve it...
Varnish sits in front of the web server and proxies these requests to the web server. As the web server returns assets, cacheable assets are stored in Varnish. Any subsequent requests for those assets are fulfilled by Varnish (meaning, the requests don鈥檛 reach the web server). Varnish ...