Basic Envoy DNS Filter

envoy_dns.yaml

admin:
  access_log_path: /tmp/admin_access.log
  address:
    socket_address:
      protocol: TCP
      address: 127.0.0.1
      port_value: 9901
static_resources:
  listeners:
  - name: listener_2
    address:
      socket_address:
        protocol: UDP
        address: 127.0.0.1
        port_value: 5353
    reuse_port: true
    listener_filters:
      name: envoy.filters.udp.dns_filter
      typed_config:
        "@type": "type.googleapis.com/envoy.extensions.filters.udp.dns_filter.v3alpha.DnsFilterConfig"
        stat_prefix: "dns_filter_prefix"
        client_config:
          resolver_timeout: 5s
          upstream_resolvers:
          - socket_address:
              address: "1.1.1.1"
              port_value: 53
          - socket_address:
              address: "8.8.4.4"
              port_value: 53
          max_pending_lookups: 5
        server_config:
          inline_dns_table:
            known_suffixes:
            - suffix: "example.org"
            - suffix: "example.com"
            - suffix: "yahoo.com"
            virtual_domains:
              - name: "www.example.org"
                endpoint:
                  address_list:
                    address:
                    - 93.184.216.34
              - name: "www.example.com"
                endpoint:
                  address_list:
                    address:
                    - 93.184.216.34
              - name: "www.yahoo.com"
                endpoint:
                  address_list:
                    address:
                    - 74.6.231.20

upstream_resolvers should be relpaced with resolvers: