Some fundamental envoy configuration yaml files

echo2.yaml

# this configure file is only for envoy-filter-example repo
admin:
  access_log_path: ./loglog.log
  address:
    socket_address:
      address: 127.0.0.1
      port_value: 0
static_resources:
  clusters:
    name: cluster_0
    connect_timeout: 0.25s
    load_assignment:
      cluster_name: cluster_0
      endpoints:
        - lb_endpoints:
            - endpoint:
                address:
                  socket_address:
                    address: 127.0.0.1
                    port_value: 0
  listeners:
    name: listener_0
    address:
      socket_address:
        address: 127.0.0.1
        port_value: 0
    filter_chains:
    - filters:
      - name: echo2
        typed_config:
          "@type": type.googleapis.com/google.protobuf.Struct

echo_network_filter.yaml

admin:
  access_log_path: /dev/null
  address:
    socket_address:
      address: 127.0.0.1
      port_value: 0
static_resources:
  clusters:
    name: cluster_0
    connect_timeout: 0.25s
    load_assignment:
      cluster_name: cluster_0
      endpoints:
        - lb_endpoints:
            - endpoint:
                address:
                  socket_address:
                    address: 127.0.0.1
                    port_value: 0
  listeners:
    name: listener_0
    address:
      socket_address:
        address: 127.0.0.1
        port_value: 0
    filter_chains:
    - filters:
      - name: echo
        typed_config:
          "@type": type.googleapis.com/envoy.extensions.filters.network.echo.v3.Echo

tcp-proxy.yaml

static_resources:
  listeners:
    - name: listener_0
      address:
        socket_address:
          address: 0.0.0.0
          port_value: 10000
      filter_chains:
        - filters:
            - name: envoy.filters.network.tcp_proxy
              typed_config:
                "@type": type.googleapis.com/envoy.extensions.filters.network.tcp_proxy.v3.TcpProxy
                stat_prefix: destination
                cluster: cluster_0
  clusters:
    - name: cluster_0
      connect_timeout: 30s
      type: LOGICAL_DNS
      dns_lookup_family: V4_ONLY
      load_assignment:
        cluster_name: cluster_0
        endpoints:
          - lb_endpoints:
              - endpoint:
                  address:
                    socket_address:
                      address: 127.0.0.1
                      port_value: 1235

udp-proxy.yaml

admin:
  address:
    socket_address:
      protocol: TCP
      address: 127.0.0.1
      port_value: 9901
static_resources:
  listeners:
  - name: listener_0
    address:
      socket_address:
        protocol: UDP
        address: 127.0.0.1
        port_value: 1234
    udp_listener_config:
      downstream_socket_config:
        max_rx_datagram_size: 9000
    listener_filters:
    - name: envoy.filters.udp_listener.udp_proxy
      typed_config:
        '@type': type.googleapis.com/envoy.extensions.filters.udp.udp_proxy.v3.UdpProxyConfig
        stat_prefix: service
        matcher:
          on_no_match:
            action:
              name: route
              typed_config:
                '@type': type.googleapis.com/envoy.extensions.filters.udp.udp_proxy.v3.Route
                cluster: service_udp
        upstream_socket_config:
          max_rx_datagram_size: 9000
  clusters:
  - name: service_udp
    type: STATIC
    lb_policy: ROUND_ROBIN
    load_assignment:
      cluster_name: service_udp
      endpoints:
      - lb_endpoints:
        - endpoint:
            address:
              socket_address:
                address: 127.0.0.1
                port_value: 1235