Envoy Proxy Dynamic Configurations

cds.yaml

# Here is the cluster definition. You can declare more than one cluster on there.
# Cluster definitions points to endpoint definitions(eds.yaml).
# Also, at this level you can configure a circuit breaker for the cluster.

version_info: "0"
resources:
- '@type': type.googleapis.com/envoy.api.v2.Cluster
  name: "EnvoyNetCore"
  connect_timeout: 5s
  lb_policy: ROUND_ROBIN
  type: EDS
  eds_cluster_config:
    service_name: "EnvoyNetCore"
    eds_config:
      path: /etc/envoy/eds.yaml

eds.yaml

# The last part of the configuration file is eds.yaml.
# This file contains the address and port values to call any endpoint we want to include for the cluster.
# You can define only one resource item at this point but more than one endpoints can be provided.

version_info: "0"
resources:
- '@type': type.googleapis.com/envoy.api.v2.ClusterLoadAssignment
  cluster_name: ""
  endpoints:
  - lb_endpoints:
    - endpoint:
        address:
          socket_address:
            address: 127.0.0.1 # The address of the application.
            port_value: "8181" # Listening port from the application.

envoy.yaml

# node section is required.
# Envoy exposes a local administration interface that can be used to query and modify different aspects of the server.
# There is two dynamic config file provided. One for cluster definitions and the another one for listerners.

node:
  id: id_1
  cluster: main
admin:
  access_log_path: /tmp/envoy_admin_access.log
  address:
    socket_address:
      address: 0.0.0.0
      port_value: "9901"
dynamic_resources:
  cds_config:
    path: /etc/envoy/cds.yaml
  lds_config:
    path: /etc/envoy/lds.yaml

lds.yaml

# The listener_0 configuration 
# Listens to port 80 and redirects all the requests to the route definiton(/etc/envoy/rds.yaml) named local_route.

version_info: "0"
resources:
- '@type': type.googleapis.com/envoy.api.v2.Listener
  name: listener_0
  address:
    socket_address:
      address: 0.0.0.0
      port_value: "80"
  filter_chains:
  - filters:
    - name: envoy.http_connection_manager
      config:
        stat_prefix: ingress_http
        codec_type: AUTO
        server_name: default
        rds:
          route_config_name: local_route
          config_source:
            path: /etc/envoy/rds.yaml
        http_filters:
        - name: envoy.router

rds.yaml

# The route definition that pass all the requests to the cluster named EnvoyNetCore.
# The cluster known from the envoy.yaml file. (/etc/envoy/cds.yaml)

version_info: "0"
resources:
- '@type': type.googleapis.com/envoy.api.v2.RouteConfiguration
  name: local_route # route_config_name on the lds.yaml
  virtual_hosts:
  - name: "EnvoyNetCore"
    domains:
    - "envoynetcore.com"
    routes:
    - match:
        prefix: /
      route:
        cluster: "EnvoyNetCore" # cluster name on the cds.yaml we want to point to.
        timeout: 60s