table.lookup_integer
Available inall subroutines.
Looks up the key key in the table id. When the key is present, its
associated value will be returned. When the key is absent, the default
value is returned. The default value is required.
Example
backend prod { .host = "203.0.113.0"; }backend beta { .host = "203.0.113.1"; }
table percent_for_beta INTEGER { "a.example.com": 50, "b.example.com": 20, "c.example.com": 80,}
sub vcl_recv { if (randomint(0, 99) < table.lookup_integer(percent_for_beta, req.http.host, 0)) { set req.backend = beta; } else { set req.backend = prod; }}