Build a retractable ECS load balance network through aliyun openapi.

ECSEquilizer Build Status

通过阿里云OpenAPI建立一个可伸缩的负载均衡网络调度器。

简介

为确保代理集群网络和计算能力可以通过ECS云服务动态伸缩,所以制定实现以下策略。

节点分为static和dynamic两种,static节点是通过配置文件(config.yaml)实现预设的,固定不变。

dynamic由调度器根据节点集群健康状态调用ECS节点动态伸缩。

健康状态评估

每个节点有三个状态:great,normal,bad

评估方法用tcping,对每个节点的业务TCP端口ping四次求平均值,延迟小于100ms为great,小于1s为normal,超过1s为bad

负载均衡策略

调度器每10分钟调度一次,每次调度遵循三个规则。

  1. 当static节点状态均大于等于normal状态(且持续超过1个小时),则释放所有dynamic节点。

  2. 当所有节点当中,超过50%的节点状态为bad,则调度器自动创建N个dynamic节点,使网络状态恢复至50%节点大于等于normal。

  3. 当所有节点中,超过60%的节点状态为大于等于normal,则持续释放dynamic至小于60%。

新创建的节点由于ECS初始化延迟的缘故,健康状态默认为normal,实际状态由下次调度更新实际状态。

编译/测试/运行

$> make tidy

$> make test

$> make 过程中会创建https自签证书

编辑 ./target/config.yaml 修改配置信息

$> cd target

$> ./ecsEquilizer

HTTP 身份认证

修改config.yaml配置文件中的authorization参数添加Key

在HTTP请求头中添加 Authorization : Bearer [vaild-key]

Restful API

GET /v1/nodes

Result:

{
	"nodes":[
		{
			"id":"S0",
			"ip":"127.0.0.1",
			"port":"1234",
			"type":"static",
			"status":"normal"
		},
		{
			"id":"S1",
			"ip":"127.0.0.1",
			"port":"4567",
			"type":"dynamic",
			"status":"normal"
		}
	]
}

回调接口

修改config.yaml配置文件中的https_callback参数添加回调地址,回调格式如下。

设置 https_callback_auth 参数,将在回调请求的HTTP头参数中加入Authorization进行身份认证

如果https_callback参数为空字符串,则不使用回调。


POST [https_callback]

{
    "id": "D1", 
    "ip": "127.0.0.1", 
    "action": "dropped"
}

action 参数值有两种,createddropped,分别表示对该结点的创建和释放。

业务接入

业务可通过调度器接口,拿到所有节点状态,优先拿出健康状态更好的节点为客户提供服务。

调度器提供回调,当有节点创建或者被释放,将通知业务节点。

注意事项

修改config.yaml配置文件中的work_internal_second参数设置调度间隔时间,要确保时长足够所需调度的节点启动完成。

Owner
B23r0
If the code cant run , thats not what i wrote. :b
B23r0
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