envoy proxy protocol upstream example

envoyconf.yaml

admin:
  access_log_path: /tmp/admin_access.log
  address:
    socket_address:
      protocol: TCP
      address: 0.0.0.0
      port_value: 9901
static_resources:
  listeners:
  - name: tcp_listener
    address:
      socket_address:
        protocol: TCP
        address: 0.0.0.0
        port_value: 13000
    listener_filters:
    - name: envoy.listener.proxy_protocol
    filter_chains:
    - filter_chain_match:
        destination_port: 4251
      filters: 
      - name: envoy.tcp_proxy
        config:
          cluster: httpbin1
          stat_prefix: httpbin1
          access_log:
          - name: envoy.file_access_log
            config:
              path: /dev/stdout
    - filter_chain_match:
        destination_port: 4252
      filters: 
      - name: envoy.tcp_proxy
        config:
          cluster: httpbin2
          stat_prefix: httpbin2
          access_log:
          - name: envoy.file_access_log
            config:
              path: /dev/stdout
  clusters:
  - name: httpbin1
    type: STRICT_DNS
    connect_timeout: 1s
    lb_policy: round_robin
    hosts:
    - socket_address:
        address: 127.0.0.1
        port_value: 12345
  - name: httpbin2
    type: STRICT_DNS
    connect_timeout: 1s
    lb_policy: round_robin
    hosts:
    - socket_address:
        address: httpbin.org
        port_value: 80