A go template file for configuring the EnvoyProxy to talk to an XDS server for LDS/CDS

bootstrap.conf.tmpl

{
  "node": {
    "id": "{{envOrDefault "ENVOY_NODE_ID" "some-node"}}",
    "cluster": "{{envOrDefault "ENVOY_NODE_CLUSTER" "some-cluster"}}",
    "locality": {
      "zone": "{{envOrDefault "ENVOY_NODE_ZONE" "some-zone"}}"
    }
  },
  "static_resources": {
    "clusters": [
      {
        "name": "tbn-xds",
        "type": "static",
        "connect_timeout": {
          "seconds": "{{envOrDefault "ENVOY_XDS_CONNECT_TIMEOUT_SECS" "30"}}"
        },
        "lb_policy": "ROUND_ROBIN",
        "hosts": [
          {
            "socket_address": {
              "protocol": "TCP",
              "address": "{{envOrDefault "ENVOY_XDS_IP" "127.0.0.1"}}",
              "port_value": "{{envOrDefault "ENVOY_XDS_PORT" "50000"}}"
            }
          }
        ],
        "http2_protocol_options": {
          "max_concurrent_streams": 10
        }
      }
    ]
  },
  "dynamic_resources": {
    "lds_config": {
      "api_config_source": {
        "api_type": "GRPC",
        "cluster_names": ["tbn-xds"],
        "refresh_delay": {
          "seconds": {{envOrDefault "ENVOY_XDS_REFRESH_DELAY_SECS" "10"}}
        }
      }
    },
    "cds_config": {
      "api_config_source": {
        "api_type": "GRPC",
        "cluster_names": ["tbn-xds"],
        "refresh_delay": {
          "seconds": {{envOrDefault "ENVOY_XDS_REFRESH_DELAY_SECS" "10"}}
        }
      }
    }
  },
  "admin":{
    "access_log_path": "{{envOrDefault "ENVOY_ADMIN_LOG" "/tmp/envoy-admin.log"}}",
    "address": {
      "socket_address": {
        "protocol": "TCP",
        "address": "{{envOrDefault "ENVOY_ADMIN_IP" "0.0.0.0"}}",
        "port_value": "{{envOrDefault "ENVOY_ADMIN_PORT" "9999"}}"
      }
    }
  }
}