负载均衡route根据paths转发给相应的service根据host（upstream的name）转发给 upstream负载均衡至targets，这就是kong的负载均衡执行流程，下面通过restApi分别配置upstream,service,route。upstreams创建名为upstream.api的upstreamcurl -X POST localhost:8001/upstreams-d “name=upstream.api”// reponse{ “created_at”: 1553661443, “hash_on”: “none”, “id”: “04c9c36c-eea8-4d58-8668-3bfa117c34fd”, “name”: “upstream.api”, …}为upstream.api添加后端服务器curl -X POST localhost:8001/upstreams/upstream.api/targets -d “target=192.168.20.6:8888” -d “weight=100”// reponse{ “created_at”: 1553663185.86, “upstream”: { “id”: “04c9c36c-eea8-4d58-8668-3bfa117c34fd” }, “id”: “3386af25-8643-4c9c-aff5-bd30451ae24b”, “target”: “192.168.20.6:8888”, “weight”: 100}curl -X POST localhost:8001/upstreams/upstream.api/targets -d “target=192.168.20.6:9999” -d “weight=100”// reponse{ “created_at”: 1553663185.86, “upstream”: { “id”: “04c9c36c-eea8-4d58-8668-3bfa117c34fd” }, “id”: “3386af25-8643-4c9c-aff5-bd30451ae24b”, “target”: “192.168.20.6:9999”, “weight”: 100}等同于创建了如下配置：upstream upstream.api { server 192.168.20.6:8888 weight=100; server 192.168.20.6:9999 weight=100;}services创建名为service.api的服务，并通过host绑定相应的后端服务upstream.api。curl -X POST localhost:8001/services/service.api-d “name=service.api”-d “host=upstream.api”//{ “host”: “upstream.api”,//绑定的upstream “created_at”: 1553663485, “connect_timeout”: 60000, “id”: “5b93eda7-7ba5-4acc-a536-cf12f58a1144”,//service.id “protocol”: “http”, “name”: “service.api”, “read_timeout”: 60000, “port”: 80, “path”: “/api/v1”, “updated_at”: 1553663485, “retries”: 5, “write_timeout”: 60000}等同于http { server { listen 8000; location waiting-for-define { proxy_pass http://upstream.api; } }}routes为服务service.api绑定路由。需要理解，route并非一条url，它是kong的路由服务，可以为某个kong服务管理管理一套路由集合，route就相当于 http > server 中的 location 规则集合。#为service.api添加路由集合curl -X POST localhost:8001/routes -d “name=route.api” -d “paths[]=/api/v1” -d “paths[]=/api/v2” -d “paths[]=/api/v3” -d “hosts[]=api.service.com” -d “hosts[]=service.com” -d “service.id=5b93eda7-7ba5-4acc-a536-cf12f58a1144”#或者通过 services 的接口curl -X POST localhost:8001/services/service.api/routes -d “name=route.api” -d “paths[]=/api/v1” -d “paths[]=/api/v2” -d “paths[]=/api/v3” -d “hosts[]=localhost” -d “hosts[]=api.service.com” -d “hosts[]=service.com” \我们还同时指定了hosts，相当于server_name，顺手把虚拟主机也做了。大致等同于如下配置：http { server { listen 8000; server_name localhost api.service.com service.com; location /api/v1 { proxy_pass http://upstream.api; } location /api/v2 { proxy_pass http://upstream.api; } location /api/v3 { proxy_pass http://upstream.api; } }}这样我们可以通过localhost:8000/api/v1api.service.com:8000/api/v2service.com:8000/api/v3来访问 service.api服务，此服务后端有两台服务器做 LB。