负载报告服务 (LRS)

负载报告服务提供了一种机制，使 Envoy 可以定期向管理服务器发出负载报告。

这将启动与管理服务器的双向流。连接后，管理服务器可以发送 LoadStatsResponse 到它想要获取负载报告的节点。该节点中的 Envoy 将开始发送 LoadStatsRequest。这是根据 负载报告间隔 定期执行的。

具有 LRS 的 Envoy 配置示例

envoy.yaml
 1static_resources:
 2  listeners:
 3  - address:
 4      socket_address:
 5        address: 0.0.0.0
 6        port_value: 80
 7    filter_chains:
 8    - filters:
 9      - name: envoy.filters.network.http_connection_manager
10        typed_config:
11          "@type": type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
12          codec_type: AUTO
13          stat_prefix: ingress_http
14          route_config:
15            name: local_route
16            virtual_hosts:
17            - name: service
18              domains:
19              - "*"
20              routes:
21              - match:
22                  prefix: "/service"
23                route:
24                  cluster: local_service
25          http_filters:
26          - name: envoy.filters.http.router
27            typed_config:
28              "@type": type.googleapis.com/envoy.extensions.filters.http.router.v3.Router
29  clusters:
30  - name: local_service
31    type: STRICT_DNS
32    lb_policy: ROUND_ROBIN
33    load_assignment:
34      cluster_name: local_service
35      endpoints:
36      - lb_endpoints:
37        - endpoint:
38            address:
39              socket_address:
40                address: http_service
41                port_value: 8080
42  - name: load_reporting_cluster
43    type: STRICT_DNS
44    lb_policy: ROUND_ROBIN
45    typed_extension_protocol_options:
46      envoy.extensions.upstreams.http.v3.HttpProtocolOptions:
47        "@type": type.googleapis.com/envoy.extensions.upstreams.http.v3.HttpProtocolOptions
48        explicit_http_config:
49          http2_protocol_options: {}
50    load_assignment:
51      cluster_name: load_reporting_cluster
52      endpoints:
53      - lb_endpoints:
54        - endpoint:
55            address:
56              socket_address:
57                address: lrs_server
58                port_value: 18000
59cluster_manager:
60  load_stats_config:
61    api_type: GRPC
62    grpc_services:
63    - envoy_grpc:
64        cluster_name: load_reporting_cluster
65admin:
66  address:
67    socket_address:
68      address: 0.0.0.0
69      port_value: 8081