Matomo - Varnish Configuration - VCL

matomo.vcl

probe matomo_health {
  .url = "/";
  .interval = 5s;
  .timeout = 3s;
  .window = 5;
  .threshold =3;
}

backend matomo_1 {
  .host = "10.0.0.1";
  .port = "80";
  .probe = matomo_health;
}
backend matomo_2 {
  .host = "10.0.0.2";
  .port = "80";
  .probe = matomo_health;
}

sub vcl_init {
  new matomo = directors.round_robin();
  matomo.add_backend(matomo_1);
  matomo.add_backend(matomo_2);
}

sub vcl_recv {
  if (req.http.host == "analytics.example.com") {
    set req.backend_hint = matomo.backend();

    if (req.url ~ "\.(png|gif|jpg|swf|css|js|ico|svg|woff2)(\?.*|)$") {
      unset req.http.cookie;
      return (hash);
    }

    return(pass);
  }
}

sub vcl_backend_response {
  if (bereq.url == "analytics.example.com") {
    set beresp.uncacheable = true;
    set beresp.ttl = 60s;
    return (deliver);
  }
}