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所属分类：.NET技术
什么是控制平面
上一篇我们讲了文件系统的动态配置，这次我们来看看通过Control Panel来配置Envoy。控制平面就是一个提供Envoy配置信息的单独服务，我们可以通过这个服务来修改Envoy的配置。官方为我们提供了两种已经实现好的控制面板。
go控制面板：https://github.com/envoyproxy/go-control-plane
java控制面板：https://github.com/envoyproxy/java-control-plane
配置控制面板
我们下载官方的go语言控制面板，并修改go-control-planeinternalexampleresource.go中的配置
首先修改upstream信息，指定我们的上游ip与两个上有服务的端口
const ( ClusterName = "example_proxy_cluster" RouteName = "local_route" ListenerName = "listener_0" ListenerPort = 10000 UpstreamHost = "192.168.43.94" UpstreamPort = 5000 UpstreamPort2 = 5001 )
然后我们修改，修改dns类型，修改为静态dns解析
func makeCluster(clusterName string) *cluster.Cluster { return &cluster.Cluster{ Name: clusterName, ConnectTimeout: ptypes.DurationProto(5 * time.Second), ClusterDiscoveryType: &cluster.Cluster_Type{Type: cluster.Cluster_STATIC}, LbPolicy: cluster.Cluster_ROUND_ROBIN, LoadAssignment: makeEndpoint(clusterName), DnsLookupFamily: cluster.Cluster_V4_ONLY, } }
修改makeEndpoint方法，指定两个Endpoint
func makeEndpoint(clusterName string) *endpoint.ClusterLoadAssignment { return &endpoint.ClusterLoadAssignment{ ClusterName: clusterName, Endpoints: []*endpoint.LocalityLbEndpoints{{ LbEndpoints: []*endpoint.LbEndpoint{{ HostIdentifier: &endpoint.LbEndpoint_Endpoint{ Endpoint: &endpoint.Endpoint{ Address: &core.Address{ Address: &core.Address_SocketAddress{ SocketAddress: &core.SocketAddress{ Protocol: core.SocketAddress_TCP, Address: UpstreamHost, PortSpecifier: &core.SocketAddress_PortValue{ PortValue: UpstreamPort, }, }, }, }, }, }, }, { HostIdentifier: &endpoint.LbEndpoint_Endpoint{ Endpoint: &endpoint.Endpoint{ Address: &core.Address{ Address: &core.Address_SocketAddress{ SocketAddress: &core.SocketAddress{ Protocol: core.SocketAddress_TCP, Address: UpstreamHost, PortSpecifier: &core.SocketAddress_PortValue{ PortValue: UpstreamPort2, }, }, }, }, }, }, }, }, }}, } }
启动控制平面
PS C:demogo-control-planeinternalexamplemain> go run .main.go 2021/10/29 15:55:14 management server listening on 18000
配置Envoy.yaml
我们需要配置Envoy.yaml让Envoy从控制平面中获取详细的配置信息，需要在dynamic_resources中配置ads_config，并让cds_config与lds_config从中读取；另外我们需要配置xds cluster，让Envoy知道控制平面的地址。具体配置信息如下：
admin: address: socket_address: address: 0.0.0.0 port_value: 9902 node: cluster: test-cluster id: test-id dynamic_resources: ads_config: api_type: GRPC transport_api_version: V3 grpc_services: - envoy_grpc: cluster_name: xds_cluster cds_config: resource_api_version: V3 ads: {} lds_config: resource_api_version: V3 ads: {} static_resources: clusters: - type: STRICT_DNS typed_extension_protocol_options: envoy.extensions.upstreams.http.v3.HttpProtocolOptions: "@type": type.googleapis.com/envoy.extensions.upstreams.http.v3.HttpProtocolOptions explicit_http_config: http2_protocol_options: {} name: xds_cluster load_assignment: cluster_name: xds_cluster endpoints: - lb_endpoints: - endpoint: address: socket_address: address: 192.168.43.94 port_value: 18000
运行Envoy
我们通过docker运行Envoy
docker run --rm -it -p 9902:9902 -p 10000:10000 -v D:/gateway/envoy/config/dynamic-plane/:/etc/envoy/ -v D:/gateway/envoy/logs:/logs envoyproxy/envoy-dev -c /etc/envoy/envoy.yaml
启动我们上一节的server1与server2
调用http://localhost:10000/Name，负载成功！！！
