Envoy Proxy使用介绍教程(九):envoy的应用方法与使用约束

目录

说明

这篇笔记比较老,不再更新维护,请移步最新的手册:envoy相关笔记

Listener使用限制

同一个“IP:Port”不能被多个Listener使用

如果envoy启动时获得的配置中,有端口冲突,会打印一条日志:

[2019-01-07 14:51:19.417][16000][critical][config] source/server/listener_manager_impl.cc:836] listener 'listener_with_dynamic_route_port_9001_repeat' failed to listen on address '0.0.0.0:9001' on worker

如果envoy动态获取的一个新的Listener与已有的Listener端口冲突,会不停的打印下面的日志:

[2019-01-07 14:53:30.086][16108][warning][config] bazel-out/k8-opt/bin/source/common/config/_virtual_includes/grpc_mux_subscription_lib/common/config/grpc_mux_subscription_impl.h:70] gRPC config for type.googleapis.com/envoy.api.v2.Listener rejected: Error adding/updating listener listener_with_dynamic_route_port_9001_repeat: cannot bind '0.0.0.0:9001': Address already in use
[2019-01-07 14:53:30.087][16108][warning][upstream] source/common/config/grpc_mux_impl.cc:226] gRPC config for type.googleapis.com/envoy.api.v2.Listener update rejected: Error adding/updating listener listener_with_dynamic_route_port_9001_repeat: cannot bind '0.0.0.0:9001': Address already in use
[2019-01-07 14:53:30.088][16108][warning][config] bazel-out/k8-opt/bin/source/common/config/_virtual_includes/grpc_mux_subscription_lib/common/config/grpc_mux_subscription_impl.h:70] gRPC config for type.googleapis.com/envoy.api.v2.Listener rejected: Error adding/updating listener listener_with_dynamic_route_port_9001_repeat: cannot bind '0.0.0.0:9001': Address already in use

Listener可以使用多个同名的filter

    listener := &api.Listener{
        Name: "listener_with_dynamic_route_port_9002",
        Address: core.Address{
            Address: &core.Address_SocketAddress{
                SocketAddress: &core.SocketAddress{
                    Protocol: core.TCP,
                    Address:  "0.0.0.0",
                    PortSpecifier: &core.SocketAddress_PortValue{
                        PortValue: 9002,
                    },
                },
            },
        },
        FilterChains: []listener.FilterChain{
            listener.FilterChain{
                Filters: []listener.Filter{
                    listener.Filter{
                        Name: "envoy.http_connection_manager",
                        ConfigType: &listener.Filter_Config{
                            Config: listen_filter_http_conn,
                        },
                    },
                    listener.Filter{
                        Name: "envoy.http_connection_manager",
                        ConfigType: &listener.Filter_Config{
                            Config: listen_filter_http_conn,
                        },
                    },
                },
            },
        },
    }

名为envoy.http_connection_manager的filter中可以用多个同名的http filter

名为envoy.http_connection_manager的filter中vhost的域名必须不相同

如果vhost的名称相同会触发告警,并且在/config_dump中看不到域名重复的vhost:

[2019-01-07 15:08:14.004][16790][warning][upstream] source/common/config/grpc_mux_impl.cc:226] gRPC config for type.googleapis.com/envoy.api.v2.RouteConfiguration update rejected: Only unique values for domains are permitted. Duplicate entry of domain ads.webshell.com
[2019-01-07 15:08:14.004][16790][warning][config] bazel-out/k8-opt/bin/source/common/config/_virtual_includes/grpc_mux_subscription_lib/common/config/grpc_mux_subscription_impl.h:70] gRPC config for type.googleapis.com/envoy.api.v2.RouteConfiguration rejected: Only unique values for domains are permitted. Duplicate entry of domain ads.webshell.com

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