Kong配置service负载均衡

文章目录

Kong配置service负载均衡
- 1. 创建upstream
- 2. 创建target关联upstream
- 3. service(服务)
- 4. route(路由)
- 5.负载均衡补充

1. 创建upstream

Kong提供的一个负载的功能，基于Nginx的虚拟主机的方式做的负载功能。在service中的host可指定为upstream对象，upstream添加多个target来实现负债均衡。

--添加upstream
curl -i -X POST --url http://localhost:8001/upstreams/ --data 'name=nhs.wilmar.service'

--添加成功
HTTP/1.1 201 Created
Date: Tue, 09 Oct 2018 02:22:21 GMT
Content-Type: application/json; charset=utf-8
Connection: keep-alive
Access-Control-Allow-Origin: *
Server: kong/0.14.1
Content-Length: 670

2. 创建target关联upstream

target就是在upstream进行负载均衡的终端。微服务高可部署时，需要将每个节点作为一个target，并设置负载的权重。用upstream的ID或者name来关联，例如两个节点：

--添加target 1
curl -i -X POST --url http://localhost:8001/upstreams/{upstream name or id}}targets --data 'target=10.229.255.42:9007' --data 'weight=100'

--添加target 2
curl -i -X POST --url http://localhost:8001/upstreams/nhs.wilmar.service/targets --data 'target=10.229.255.42:9008' --data 'weight=50'

--添加成功
HTTP/1.1 201 Created
Date: Tue, 09 Oct 2018 02:27:15 GMT
Content-Type: application/json; charset=utf-8
Connection: keep-alive
Access-Control-Allow-Origin: *
Server: kong/0.14.1
Content-Length: 169

3. service(服务)

Kong对外提供的API，通过host配置可访问对应的服务。可与route关联，一个service可配置多个route。可通过plugin减少或者增加header或其他内容。通过hosts属性与upstream关联。

--添加服务
curl -i -X POST \--url http://localhost:8001/services/\--data 'name=test-service' \--data 'protocol=http'  \--data 'host=nhs.wilmar.service'

--添加结果
HTTP/1.1 201 Created
Date: Tue, 09 Oct 2018 02:44:26 GMT
Content-Type: application/json; charset=utf-8
Connection: keep-alive
Access-Control-Allow-Origin: *
Server: kong/0.14.1
Content-Length: 263

4. route(路由)

Kong路由，与service关联。配置后可转发到service，一个service可配置多个route。Route作为客户端的入口，通过将Route和Service的松耦合，可以通过hosts path等规则的配置，对应到相关的service。

--添加路由
curl -i -X POST \--url http://localhost:8001/routes/ \--data 'protocols[]=http' \--data 'protocols[]=https' \--data 'methods[]=GET' \--data 'methods[]=POST' \--data 'methods[]=PATCH' \--data 'methods[]=DELETE' \--data 'methods[]=PUT' \--data 'methods[]=OPTIONS' \--data 'paths[]=/test' \--data 'service.id=1d6709e4-298b-4b8d-842b-7f74b9551f15'

--添加成功
HTTP/1.1 201 Created
Date: Tue, 09 Oct 2018 02:46:58 GMT
Content-Type: application/json; charset=utf-8
Connection: keep-alive
Access-Control-Allow-Origin: *
Server: kong/0.14.1
Content-Length: 345

Kong的负载均衡搭建完毕，查看测试结果。

[root@SHH-HQ-NHS01S etc]# curl  http://nhs-dev.wilmar.cn:8000/test/recovery/kongTest
Hello, I'm kong service. port: 9007
[root@SHH-HQ-NHS01S etc]# curl  http://nhs-dev.wilmar.cn:8000/test/recovery/kongTest
Hello, I'm kong service. port: 9007
[root@SHH-HQ-NHS01S etc]# curl  http://nhs-dev.wilmar.cn:8000/test/recovery/kongTest
Hello, I'm kong service. port: 9007
[root@SHH-HQ-NHS01S etc]# curl  http://nhs-dev.wilmar.cn:8000/test/recovery/kongTest
Hello, I'm kong service. port: 9007
[root@SHH-HQ-NHS01S etc]# curl  http://nhs-dev.wilmar.cn:8000/test/recovery/kongTest
Hello, I'm kong service. port: 9008
[root@SHH-HQ-NHS01S etc]# curl  http://nhs-dev.wilmar.cn:8000/test/recovery/kongTest
Hello, I'm kong service. port: 9007
[root@SHH-HQ-NHS01S etc]# curl  http://nhs-dev.wilmar.cn:8000/test/recovery/kongTest
Hello, I'm kong service. port: 9008

5.负载均衡补充

各个模块对应的接口，有父子关系的，查询时带上父类的ID或者名称。每个模块对应的API(modules指services，routes，upstreams，targets):

--单个查询
curl -i -X GET http://host:8001/{modules}/{module id or name}
--列表查询 /{modules}
curl -i -X GET http://host:8001/{modules}
--父子关系
curl -i -X GET http://host:8001/{parents}/{parent name or id}/{child}
--更新
curl -i -X PATCH http://host:8001/{modules}/{module id or name}
--删除
curl -i -X DELETE http://host:8001/{modules}/{module id or name}

时序图：

sequenceDiagram
Routes->> Kong Services: match
Kong Services->> Upstreams: match
Upstreams->> targets: match
targets->> Wilmar Micro Services: visit

各个模块参数官方说明地址：https://docs.konghq.com/0.13.x/admin-api/#add-service