caseyfw/autovarnish

Varnish 4 image that updates automatically when its config is changed.

Usage

Volume a directory containing your custom config.vcl into /varnish - e.g.

docker run --detach --volume ${PWD}:/varnish --publish 80:80 caseyfw/autovarnish

Now any changes made to config.vcl will result in a vcl.load and vcl.use in the container.

If you're having problems, you may find the log output useful - it will output unsuccessful VCL compilations if they occur.

docker logs -f autovarnish

Sample config.vcl file

The following config.vcl would result in requests for /my-app-path being directed to 172.17.0.1:8000.

backend my_app {
  .host = "172.17.0.1";
  .port = "8000";
  .connect_timeout = 1s;
  .first_byte_timeout = 30s;
  .between_bytes_timeout = 10s;
  .max_connections = 10;
}

sub vcl_recv {
  if (req.url ~ "^/my-app-path") {
    set req.backend_hint = my_app;
  }
}

Default backend

The default backend is unset. However, a pseudo default backend called 'first' is defined as 172.17.0.1:8080. Being the first backend defined in config, this is the default backend unless you create one explicitly named 'default'.