basic envoy config

envoy.yaml

overload_manager:
  refresh_interval: 0.25s
  resource_monitors:
  - name: "envoy.resource_monitors.fixed_heap"
    typed_config:
      "@type": type.googleapis.com/envoy.extensions.resource_monitors.fixed_heap.v3.FixedHeapConfig
      max_heap_size_bytes: 268435456 # 256 MiB
  actions:
  - name: "envoy.overload_actions.shrink_heap"
    triggers:
    - name: "envoy.resource_monitors.fixed_heap"
      threshold:
        value: 0.95
  - name: "envoy.overload_actions.stop_accepting_requests"
    triggers:
    - name: "envoy.resource_monitors.fixed_heap"
      threshold:
        value: 0.98

admin:
  access_log_path: /tmp/admin_access.log
  address:
    socket_address: { address: 127.0.0.1, port_value: 9901 }

static_resources:
  listeners:
  - name: app
    address:
      socket_address: { address: 0.0.0.0, port_value: 80 }
    per_connection_buffer_limit_bytes: 32768  # 32 KiB
    filter_chains:
    - filters:
      - name: envoy.filters.network.http_connection_manager
        typed_config:
          "@type": type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
          stat_prefix: ingress_http
          use_remote_address: true
          normalize_path: true
          merge_slashes: true
          path_with_escaped_slashes_action: UNESCAPE_AND_REDIRECT
          common_http_protocol_options:
            idle_timeout: 3600s  # 1 hour
            headers_with_underscores_action: REJECT_REQUEST
          # http2_protocol_options:
          #   max_concurrent_streams: 100
          #   initial_stream_window_size: 65536  # 64 KiB
          #   initial_connection_window_size: 1048576  # 1 MiB
          stream_idle_timeout: 300s  # 5 mins, must be disabled for long-lived and streaming requests
          request_timeout: 300s  # 5 mins, must be disabled for long-lived and streaming requests
          access_log:
          - name: envoy.access_loggers.stdout
            typed_config:
              "@type": type.googleapis.com/envoy.extensions.access_loggers.stream.v3.StdoutAccessLog
          http_filters:
          - name: envoy.filters.http.buffer
            typed_config:
              "@type": type.googleapis.com/envoy.extensions.filters.http.buffer.v3.Buffer
              max_request_bytes: 32768  # 32 KiB
          - name: envoy.filters.http.router
            typed_config:
              "@type": type.googleapis.com/envoy.extensions.filters.http.router.v3.Router
          route_config:
            name: local_route
            virtual_hosts:
            - name: app
              domains: ["*"]
              routes:
              - match: 
                  prefix: "/"
                route:
                  cluster: app
                  idle_timeout: 15s  # must be disabled for long-lived and streaming requests

  clusters:
  - name: app
    # connect_timeout: 0.5s
    # type: STATIC
    # dns_lookup_family: V4_ONLY
    # lb_policy: ROUND_ROBIN
    per_connection_buffer_limit_bytes: 32768  # 32 KiB
    load_assignment:
      cluster_name: app
      endpoints:
      - lb_endpoints:
        - endpoint:
            address:
              socket_address:
                address: 127.0.0.1
                port_value: 8001

layered_runtime:
  layers:
  - name: static_layer_0
    static_layer:
      envoy:
        resource_limits:
          listener:
            app:
              connection_limit: 10000
            test_app:
              connection_limit: 10000
      overload:
        global_downstream_max_connections: 50000