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192 lines
5.5 KiB
Markdown
192 lines
5.5 KiB
Markdown
---
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title: zipkin
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---
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<!--
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership.
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# The ASF licenses this file to You under the Apache License, Version 2.0
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# (the "License"); you may not use this file except in compliance with
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# the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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-->
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## 目录
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- [**名字**](#名字)
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- [**属性**](#属性)
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- [**如何启用**](#如何启用)
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- [**测试插件**](#测试插件)
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- [**禁用插件**](#禁用插件)
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## 名字
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`zipkin`(https://github.com/openzipkin/zipkin) 是一个开源的服务跟踪插件。
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它还可以在 “Apache SkyWalking” 上运行，支持 Zipkin v1/v2 格式。
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## 属性
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| 名称 | 类型 | 必选项 | 默认值 | 有效值 | 描述 |
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| ------------ | ------ | ------ | -------- | ------------ | -------------------------------------------------------------------- |
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| endpoint | string | 必须 | | | Zipkin 的 http 节点，例如`http://127.0.0.1:9411/api/v2/spans`。 |
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| sample_ratio | number | 必须 | | [0.00001, 1] | 监听的比例 |
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| service_name | string | 可选 | "APISIX" | | 标记当前服务的名称 |
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| server_addr | string | 可选 | | | 标记当前 APISIX 实例的IP地址，默认值是 nginx 的内置变量`server_addr` |
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| span_version | integer| 可选 | 2 | [1, 2] | span 类型版本 |
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目前每个被跟踪的请求会创建下面的 span：
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```
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request
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├── proxy: from the beginning of the request to the beginning of header filter
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└── response: from the beginning of header filter to the beginning of log
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```
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之前我们创建的 span 是这样：
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```
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request
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├── rewrite
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├── access
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└── proxy
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└── body_filter
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```
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注意上述的 span 的名称跟同名的 Nginx phase 没有关系。
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如果你需要兼容过去的 span 类型，可以把 `span_version` 设置成 1。
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## 如何启用
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下面是一个示例，在指定的 route 上开启了 zipkin 插件:
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```shell
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curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
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{
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"methods": ["GET"],
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"uri": "/index.html",
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"plugins": {
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"zipkin": {
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"endpoint": "http://127.0.0.1:9411/api/v2/spans",
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"sample_ratio": 1,
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"service_name": "APISIX-IN-SG",
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"server_addr": "192.168.3.50"
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}
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},
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"upstream": {
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"type": "roundrobin",
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"nodes": {
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"39.97.63.215:80": 1
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}
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}
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}'
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```
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你可以使用浏览器打开 dashboard：`http://127.0.0.1:9080/apisix/dashboard/`，通过 web 界面来完成上面的操作，先增加一个 route：
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然后在 route 页面中添加 zipkin 插件：
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## 测试插件
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### 运行 Zipkin 实例
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e.g. 用docker:
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```
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sudo docker run -d -p 9411:9411 openzipkin/zipkin
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```
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测试示例:
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```shell
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$ curl http://127.0.0.1:9080/index.html
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HTTP/1.1 200 OK
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...
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```
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打开浏览器，访问 Zipkin 的 web 页面：
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```
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http://127.0.0.1:9411/zipkin
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```
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## 禁用插件
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当你想去掉插件的时候，很简单，在插件的配置中把对应的 json 配置删除即可，无须重启服务，即刻生效：
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```shell
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$ curl http://127.0.0.1:2379/v2/keys/apisix/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d value='
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{
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"methods": ["GET"],
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"uri": "/index.html",
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"plugins": {
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},
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"upstream": {
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"type": "roundrobin",
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"nodes": {
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"39.97.63.215:80": 1
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}
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}
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}'
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```
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现在就已经移除了 Zipkin 插件了。其他插件的开启和移除也是同样的方法。
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## 上游服务是Golang的示例代码
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```golang
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func GetTracer(serviceName string, port int, enpoitUrl string, rate float64) *zipkin.Tracer {
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// create a reporter to be used by the tracer
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reporter := httpreporter.NewReporter(enpoitUrl)
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// set-up the local endpoint for our service host is ip:host
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thisip, _ := GetLocalIP()
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host := fmt.Sprintf("%s:%d", thisip, port)
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endpoint, _ := zipkin.NewEndpoint(serviceName, host)
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// set-up our sampling strategy
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sampler, _ := zipkin.NewCountingSampler(rate)
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// initialize the tracer
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tracer, _ := zipkin.NewTracer(
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reporter,
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zipkin.WithLocalEndpoint(endpoint),
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zipkin.WithSampler(sampler),
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)
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return tracer
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}
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func main(){
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r := gin.Default()
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tracer := GetTracer(...)
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// use middleware to extract parentID from http header that injected by APISIX
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r.Use(func(c *gin.Context) {
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span := this.Tracer.Extract(b3.ExtractHTTP(c.Request))
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childSpan := this.Tracer.StartSpan(spanName, zipkin.Parent(span))
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defer childSpan.Finish()
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c.Next()
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})
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}
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```
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