xDS API をそのまま記述した例

service2.json

{
   "cds": {
      "resources": [
         {
            "@type": "type.googleapis.com/envoy.api.v2.Cluster",
            "circuit_breakers": {
               "thresholds": [
                  {
                     "max_connections": 256,
                     "max_pending_requests": 512,
                     "max_retries": 2
                  }
               ]
            },
            "connect_timeout": "3s",
            "dns_lookup_family": "V4_ONLY",
            "load_assignment": {
               "cluster_name": "upstream2",
               "endpoints": [
                  {
                     "lb_endpoints": [
                        {
                           "endpoint": {
                              "address": {
                                 "socket_address": {
                                    "address": "upstream2.example.com",
                                    "port_value": 80
                                 }
                              }
                           }
                        }
                     ]
                  }
               ]
            },
            "name": "upstream2",
            "protocol_selection": "USE_DOWNSTREAM_PROTOCOL",
            "type": "STRICT_DNS"
         }
      ],
      "type_url": "type.googleapis.com/envoy.api.v2.Cluster",
      "version_info": "sample"
   },
   "rds": {
      "resources": [
         {
            "@type": "type.googleapis.com/envoy.api.v2.RouteConfiguration",
            "name": "sample",
            "virtual_hosts": [
               {
                  "domains": [
                     "upstream2"
                  ],
                  "name": "upstream2",
                  "routes": [
                     {
                        "match": {
                           "headers": [
                              {
                                 "name": ":method",
                                 "safe_regex_match": {
                                    "google_re2": { },
                                    "regex": "(GET|HEAD)"
                                 }
                              }
                           ],
                           "prefix": "/"
                        },
                        "route": {
                           "auto_host_rewrite": true,
                           "cluster": "upstream2",
                           "retry_policy": {
                              "num_retries": 3,
                              "per_try_timeout": "3s",
                              "retry_on": "5xx,connect-failure,refused-stream"
                           },
                           "timeout": "10s"
                        }
                     },
                     {
                        "match": {
                           "prefix": "/"
                        },
                        "route": {
                           "auto_host_rewrite": true,
                           "cluster": "barbeque",
                           "timeout": "10s"
                        }
                     }
                  ]
               }
            ]
         }
      ],
      "type_url": "type.googleapis.com/envoy.api.v2.RouteConfiguration",
      "version_info": "sample"
   }
}

service2.jsonnet

local xdsTemplate = import 'lib/xds_template.libsonnet';

local upstream2 = import 'lib/upstreams/upstream2.libsonnet';

local env = 'production';

local upstreams = [
  upstream2,
];

xdsTemplate.generate(upstreams, env)

upstream2.libsonnet

local cds = import '../cds.libsonnet';
local circuitBreakers = import '../circuit_breakers.libsonnet';
local rds = import '../rds.libsonnet';
local routes = import '../routes.libsonnet';

local name = 'upstream2';
local clusterNameProduction = 'upstream2-production';

{
  production: {
    rds: rds.default(name) {
      routes: routes.default(clusterNameProduction),
    },
    cds: cds.lb(clusterNameProduction, '3s', 'upstream2.example.com', 80) {
      circuit_breakers: circuitBreakers.default,
    },
  },
}