Raspberry Pi compatible Docker base image with Varnish.
Debian Stretch Varnish 5.x Arm32v7 Arch
Varnish Cache is a web application accelerator also known as a caching HTTP reverse proxy. You install it in front of any server that speaks HTTP and configure it to cache the contents. Varnish Cache is really, really fast. It typically speeds up delivery with a factor of 300 - 1000x, depending on your architecture. A high level overview of what Varnish does can be seen in this video.
For more information and related downloads for Varnish Cache please visit varnish-cache.org.
To configure this container, you can edit the default.vcl file to point your backend or you can provide a custom config.vcl file (which is usually the case).
docker run -d \
--link web-app:backend-host \
--volumes-from web-app \
--env 'VCL_CONFIG=/data/path/to/varnish.vcl' \
gioamato/rpi-varnish
In the above example we assume that:
- You have your application running inside
web-appcontainer and web server there is running on port 80 (although you don't need to expose that port, as we use --link and varnish will connect directly to it) web-appcontainer has/datavolume withvarnish.vclsomewhere thereweb-appis aliased inside varnish container asbackend-host- Your
varnish.vclshould contain at least backend definition like this:
backend default {
.host = "backend-host";
.port = "80";
}
When you start the rpi-varnish image, you can adjust the configuration of the Varnish Cache instance by passing one or more environment variables on the docker run command line.
This variable will set the custom.vcl file to configure the Varnish daemon.
This variable will set the space allocated for the cache. The -s <malloc[,size]> option calls malloc() to allocate memory space for every object that goes into the cache. If the allocated space cannot fit in memory, the operating system automatically swaps the needed space to disk.
Use this variable to set other Varnish parameters to specific values during daemon startup, see List of Parameters for details.
VCL_CONFIG
/etc/varnish/default.vcl
CACHE_SIZE64m
VARNISHD_PARAMS-p default_ttl=3600 -p default_grace=3600
MIT License
Copyright (c) 2018 Giovanbattista Amato
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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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