手把手教你学会 SkyWalking，附视频教程！

川长思鸟来 2023-01-03 15:24 342阅读 0赞

## 你知道的越多，不知道的就越多，业余的像一棵小草！ ##

你来，我们一起精进！你不来，我和你的竞争对手一起精进！

## 编辑：业余草 ##

## https://urlify.cn/Zfy2ia ##

## 推荐：https://www.xttblog.com/?p=5138 ##

SkyWalking 是一个应用性能监控系统，特别为微服务、云原生和基于容器（Docker, Kubernetes, Mesos）体系结构而设计。

除了应用指标监控以外，它还能对分布式调用链路进行追踪。类似功能的组件还有：Zipkin、**Pinpoint**、CAT等。

上几张图，看看效果，然后再一步一步搭建并使用。

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## 1、概念与架构    ##

SkyWalking是一个开源监控平台，用于从服务和云原生基础设施收集、分析、聚合和可视化数据。

SkyWalking提供了一种简单的方法来维护分布式系统的清晰视图，甚至可以跨云查看。它是一种现代APM，专门为云原生、基于容器的分布式系统设计。

SkyWalking从三个维度对应用进行监视：service（服务）, service instance（实例）, endpoint（端点）

服务和实例就不多说了，端点是服务中的某个路径或者说URI

> SkyWalking allows users to understand the topology relationship between Services and Endpoints, to view the metrics of every Service/Service Instance/Endpoint and to set alarm rules.

SkyWalking允许用户了解服务和端点之间的拓扑关系，查看每个服务/服务实例/端点的度量，并设置警报规则。

#### 1.1. 架构 ####

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SkyWalking逻辑上分为四个部分：Probes（探针）, Platform backend（平台后端）, Storage（存储）, UI

这个结构就很清晰了，探针就是Agent负责采集数据并上报给服务端，服务端对数据进行处理和存储，UI负责展示

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## 2、下载与安装    ##

SkyWalking有两中版本，ES版本和非ES版。

如果我们决定采用ElasticSearch作为存储，那么就下载es版本。

> https://skywalking.apache.org/downloads/  
> https://archive.apache.org/dist/skywalking/

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agent目录将来要拷贝到各服务所在机器上用作探针

bin目录是服务启动脚本

config目录是配置文件

oap-libs目录是oap服务运行所需的jar包

webapp目录是web服务运行所需的jar包

接下来，要选择存储了，支持的存储有：

*  H2
 *  ElasticSearch 6, 7
 *  MySQL
 *  TiDB
 *  **InfluxDB**

作为监控系统，首先排除H2和MySQL，这里推荐InfluxDB，它本身就是时序数据库，非常适合这种场景

但是InfluxDB我不是很熟悉，所以这里先用ElasticSearch7

> https://github.com/apache/skywalking/blob/master/docs/en/setup/backend/backend-storage.md

#### 2.1. 安装ElasticSearch ####

> https://www.elastic.co/guide/en/elasticsearch/reference/7.10/targz.html

# 启动
    ./bin/elasticsearch -d -p pid
    # 停止
    pkill -F pid

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ElasticSearch7.x需要Java 11以上的版本，但是如果你设置了环境变量JAVA\_HOME的话，它会用你自己的Java版本。

通常，启动过程中会报以下三个错误：

[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]
    [2]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
    [3]: the default discovery settings are unsuitable for production use; at least one of [discovery.seed_hosts, discovery.seed_providers, cluster.initial_master_nodes] must be configured

解决方法：

在 /etc/security/limits.conf 文件中追加以下内容：

* soft nofile 65536
    * hard nofile 65536
    * soft nproc  4096
    * hard nproc  4096

可通过以下四个命令查看修改结果：

ulimit -Hn
    ulimit -Sn
    ulimit -Hu
    ulimit -Su

修改 /etc/sysctl.conf 文件，追加以下内容：

vm.max_map_count=262144

修改es配置文件 elasticsearch.yml 取消注释，保留一个节点

cluster.initial_master_nodes: ["node-1"]

为了能够ip:port方式访问，还需修改网络配置

network.host: 0.0.0.0

修改完是这样的：

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至此，ElasticSearch算是启动成功了

一个节点还不够，这里用三个节点搭建一个集群

192.168.100.14 config/elasticsearch.yml

cluster.name: my-monitor
    node.name: node-1
    network.host: 192.168.100.14
    http.port: 9200
    discovery.seed_hosts: ["192.168.100.14:9300", "192.168.100.15:9300", "192.168.100.19:9300"]
    cluster.initial_master_nodes: ["node-1"]

192.168.100.15 config/elasticsearch.yml

cluster.name: my-monitor
    node.name: node-2
    network.host: 192.168.100.15
    http.port: 9200
    discovery.seed_hosts: ["192.168.100.14:9300", "192.168.100.15:9300", "192.168.100.19:9300"]
    cluster.initial_master_nodes: ["node-1"]

192.168.100.19 config/elasticsearch.yml

cluster.name: my-monitor
    node.name: node-3
    network.host: 192.168.100.19
    http.port: 9200
    discovery.seed_hosts: ["192.168.100.14:9300", "192.168.100.15:9300", "192.168.100.19:9300"]
    cluster.initial_master_nodes: ["node-1"]

同时，建议修改三个节点config/jvm.options

-Xms2g
    -Xmx2g

依次启动三个节点

pkill -F pid
    ./bin/elasticsearch -d -p pid

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接下来，修改skywalking下config/application.yml 中配置es地址即可

storage:
      selector: ${SW_STORAGE:elasticsearch7}
      elasticsearch7:
        nameSpace: ${SW_NAMESPACE:""}
        clusterNodes: ${SW_STORAGE_ES_CLUSTER_NODES:192.168.100.14:9200,192.168.100.15:9200,192.168.100.19:9200}

#### 2.2. 安装Agent ####

> https://github.com/apache/skywalking/blob/v8.2.0/docs/en/setup/service-agent/java-agent/README.md

将agent目录拷贝至各服务所在的机器上

scp -r ./agent chengjs@192.168.100.12:~/

这里，我将它拷贝至各个服务目录下

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plugins是探针用到各种插件，SkyWalking插件都是即插即用的，可以把optional-plugins中的插件放到plugins中

修改 agent/config/agent.config 配置文件，也可以通过命令行参数指定

主要是配置服务名称和后端服务地址

agent.service_name=${SW_AGENT_NAME:user-center}
    collector.backend_service=${SW_AGENT_COLLECTOR_BACKEND_SERVICES:192.168.100.17:11800}

当然，也可以通过环境变量或系统属性的方式来设置，例如：

export SW_AGENT_COLLECTOR_BACKEND_SERVICES=127.0.0.1:11800

最后，在服务启动的时候用命令行参数 -javaagent 来指定探针

java -javaagent:/path/to/skywalking-agent/skywalking-agent.jar -jar yourApp.jar

例如：

java -javaagent:./agent/skywalking-agent.jar -Dspring.profiles.active=dev -Xms512m -Xmx1024m -jar demo-0.0.1-SNAPSHOT.jar

## 3、启动服务 ##

修改 webapp/webapp.yml 文件，更改端口号及后端服务地址

server:
      port: 9000
    
    collector:
      path: /graphql
      ribbon:
        ReadTimeout: 10000
        # Point to all backend's restHost:restPort, split by ,
        listOfServers: 127.0.0.1:12800

启动服务

bin/startup.sh

或者分别依次启动

bin/oapService.sh
    bin/webappService.sh

查看logs目录下的日志文件，看是否启动成功

浏览器访问 http://127.0.0.1:9000

## 4、告警 ##

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编辑 alarm-settings.yml 设置告警规则和通知：

> https://github.com/apache/skywalking/blob/v8.2.0/docs/en/setup/backend/backend-alarm.md

重点说下告警通知

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为了使用钉钉机器人通知，接下来，新建一个项目：

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.4.0</version>
            <relativePath/> 
        </parent>
        <groupId>com.wt.monitor</groupId>
        <artifactId>skywalking-alarm</artifactId>
        <version>1.0.0-SNAPSHOT</version>
        <name>skywalking-alarm</name>
    
        <properties>
            <java.version>1.8</java.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
    
            <dependency>
                <groupId>com.aliyun</groupId>
                <artifactId>alibaba-dingtalk-service-sdk</artifactId>
                <version>1.0.1</version>
            </dependency>
    
            <dependency>
                <groupId>commons-codec</groupId>
                <artifactId>commons-codec</artifactId>
                <version>1.15</version>
            </dependency>
    
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>1.2.75</version>
            </dependency>
    
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <optional>true</optional>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>

可选依赖（不建议引入）

<dependency
        <groupId>org.apache.skywalking</groupId>
        <artifactId>server-core</artifactId>
        <version>8.2.0</version>
    </dependency>

定义告警消息实体类：

package com.wt.monitor.skywalking.alarm.domain;
    
    import lombok.Data;
    
    import java.io.Serializable;
    
    /**
     * @author ChengJianSheng
     * @date 2020/12/1
     */
    @Data
    public class AlarmMessageDTO implements Serializable {
    
        private int scopeId;
    
        private String scope;
    
        /**
         * Target scope entity name
         */
        private String name;
    
        private String id0;
    
        private String id1;
    
        private String ruleName;
    
        /**
         * Alarm text message
         */
        private String alarmMessage;
    
        /**
         * Alarm time measured in milliseconds
         */
        private long startTime;
    
    }

发送钉钉机器人消息：

package com.wt.monitor.skywalking.alarm.service;
    
    import com.dingtalk.api.DefaultDingTalkClient;
    import com.dingtalk.api.DingTalkClient;
    import com.dingtalk.api.request.OapiRobotSendRequest;
    import com.taobao.api.ApiException;
    import lombok.extern.slf4j.Slf4j;
    import org.apache.commons.codec.binary.Base64;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.stereotype.Service;
    
    import javax.crypto.Mac;
    import javax.crypto.spec.SecretKeySpec;
    import java.io.UnsupportedEncodingException;
    import java.net.URLEncoder;
    import java.security.InvalidKeyException;
    import java.security.NoSuchAlgorithmException;
    
    /**
     * https://ding-doc.dingtalk.com/doc#/serverapi2/qf2nxq
     * @author ChengJianSheng
     * @data 2020/12/1
     */
    @Slf4j
    @Service
    public class DingTalkAlarmService {
    
        @Value("${dingtalk.webhook}")
        private String webhook;
        @Value("${dingtalk.secret}")
        private String secret;
    
        public void sendMessage(String content) {
            try {
                Long timestamp = System.currentTimeMillis();
                String stringToSign = timestamp + "\n" + secret;
                Mac mac = Mac.getInstance("HmacSHA256");
                mac.init(new SecretKeySpec(secret.getBytes("UTF-8"), "HmacSHA256"));
                byte[] signData = mac.doFinal(stringToSign.getBytes("UTF-8"));
                String sign = URLEncoder.encode(new String(Base64.encodeBase64(signData)),"UTF-8");
    
                String serverUrl = webhook + "&timestamp=" + timestamp + "&sign=" + sign;
                DingTalkClient client = new DefaultDingTalkClient(serverUrl);
                OapiRobotSendRequest request = new OapiRobotSendRequest();
                request.setMsgtype("text");
                OapiRobotSendRequest.Text text = new OapiRobotSendRequest.Text();
                text.setContent(content);
                request.setText(text);
    
                client.execute(request);
            } catch (ApiException e) {
                e.printStackTrace();
                log.error(e.getMessage(), e);
            } catch (NoSuchAlgorithmException e) {
                e.printStackTrace();
                log.error(e.getMessage(), e);
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
                log.error(e.getMessage(), e);
            } catch (InvalidKeyException e) {
                e.printStackTrace();
                log.error(e.getMessage(), e);
            }
        }
    }

AlarmController.java

package com.wt.monitor.skywalking.alarm.controller;
    
    import com.alibaba.fastjson.JSON;
    import com.wt.monitor.skywalking.alarm.domain.AlarmMessageDTO;
    import com.wt.monitor.skywalking.alarm.service.DingTalkAlarmService;
    import lombok.extern.slf4j.Slf4j;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.PostMapping;
    import org.springframework.web.bind.annotation.RequestBody;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import java.text.MessageFormat;
    import java.util.List;
    
    /**
     * @author ChengJianSheng
     * @date 2020/12/1
     */
    @Slf4j
    @RestController
    @RequestMapping("/skywalking")
    public class AlarmController {
    
        @Autowired
        private DingTalkAlarmService dingTalkAlarmService;
    
        @PostMapping("/alarm")
        public void alarm(@RequestBody List<AlarmMessageDTO> alarmMessageDTOList) {
           log.info("收到告警信息: {}", JSON.toJSONString(alarmMessageDTOList));
           if (null != alarmMessageDTOList) {
               alarmMessageDTOList.forEach(e->dingTalkAlarmService.sendMessage(MessageFormat.format("-----来自SkyWalking的告警-----\n【名称】: {0}\n【消息】: {1}\n", e.getName(), e.getAlarmMessage())));
           }
        }
    }

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参考文档：

> https://skywalking.apache.org/  
> https://skywalking.apache.org/zh/\\ https://github.com/apache/skywalking/tree/v8.2.0/docs  
> https://archive.apache.org/dist/  
> https://www.elastic.co/guide/en/elasticsearch/reference/master/index.html   
> https://www.elastic.co/guide/en/elasticsearch/reference/7.10/modules-discovery-bootstrap-cluster.html  
> https://www.elastic.co/guide/en/elasticsearch/reference/7.10/modules-discovery-hosts-providers.html

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感谢点赞！视频教程地址：https://www.bilibili.com/video/BV1LT4y1L7md

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