全链路追踪神器-Skywalking实战教程

01 什么是 SkyWalking

SkyWalking 是观察性分析平台和应用性能管理系统。

提供分布式追踪、服务网格遥测分析、度量聚合和可视化一体化解决方案。

架构：

02 环境搭建

安装下载部署

1、下载

地址：http://skywalking.apache.org/zh/downloads/

2、安装

下载解压后目录如下：

不需要修改配置文件，在bin目录下执行startup.bat或startup.sh即可启动服务：

执行startup.bat之后会启动如下两个服务：

• Skywalking-Collector：

  追踪信息收集器，通过 gRPC/Http 收集客户端的采集信息 ，Http默认端口 12800，gRPC默认端口 11800。

• Skywalking-Webapp：

  管理平台页面 默认端口 8080，登录信息 admin/admin

3、配置信息

（1）收集器相关配置：支持 http/gRPC收集

core:

  default:

    restHost: ${SW_CORE_REST_HOST:0.0.0.0}

    restPort: ${SW_CORE_REST_PORT:12800}

    restContextPath: ${SW_CORE_REST_CONTEXT_PATH:/}

    gRPCHost: ${SW_CORE_GRPC_HOST:0.0.0.0}

    gRPCPort: ${SW_CORE_GRPC_PORT:11800}

    downsampling:

    - Hour

    - Day

    - Month

    # Set a timeout on metric data. After the timeout has expired, the metric data will automatically be deleted.

    recordDataTTL: ${SW_CORE_RECORD_DATA_TTL:90} # Unit is minute

    minuteMetricsDataTTL: ${SW_CORE_MINUTE_METRIC_DATA_TTL:90} # Unit is minute

    hourMetricsDataTTL: ${SW_CORE_HOUR_METRIC_DATA_TTL:36} # Unit is hour

    dayMetricsDataTTL: ${SW_CORE_DAY_METRIC_DATA_TTL:45} # Unit is day

    monthMetricsDataTTL: ${SW_CORE_MONTH_METRIC_DATA_TTL:18} # Unit is month

（2）收集信息存储：支持h2和 ES 

storage:

  h2:

    driver: ${SW_STORAGE_H2_DRIVER:org.h2.jdbcx.JdbcDataSource}

    url: ${SW_STORAGE_H2_URL:jdbc:h2:mem:skywalking-oap-db}

    user: ${SW_STORAGE_H2_USER:sa}

#  elasticsearch:

#    # nameSpace: ${SW_NAMESPACE:""}

#    clusterNodes: ${SW_STORAGE_ES_CLUSTER_NODES:localhost:9200}

#    indexShardsNumber: ${SW_STORAGE_ES_INDEX_SHARDS_NUMBER:2}

#    indexReplicasNumber: ${SW_STORAGE_ES_INDEX_REPLICAS_NUMBER:0}

#    # Batch process setting, refer to https://www.elastic.co/guide/en/elasticsearch/client/java-api/5.5/java-docs-bulk-processor.html

#    bulkActions: ${SW_STORAGE_ES_BULK_ACTIONS:2000} # Execute the bulk every 2000 requests

#    bulkSize: ${SW_STORAGE_ES_BULK_SIZE:20} # flush the bulk every 20mb

#    flushInterval: ${SW_STORAGE_ES_FLUSH_INTERVAL:10} # flush the bulk every 10 seconds whatever the number of requests

#    concurrentRequests: ${SW_STORAGE_ES_CONCURRENT_REQUESTS:2} # the number of concurrent requests

(3)可采集信息：jvm运行相关信息，zipkin追踪日志等。

receiver-register:

  default:

receiver-trace:

  default:

    bufferPath: ${SW_RECEIVER_BUFFER_PATH:../trace-buffer/}  # Path to trace buffer files, suggest to use absolute path

    bufferOffsetMaxFileSize: ${SW_RECEIVER_BUFFER_OFFSET_MAX_FILE_SIZE:100} # Unit is MB

    bufferDataMaxFileSize: ${SW_RECEIVER_BUFFER_DATA_MAX_FILE_SIZE:500} # Unit is MB

    bufferFileCleanWhenRestart: ${SW_RECEIVER_BUFFER_FILE_CLEAN_WHEN_RESTART:false}

    sampleRate: ${SW_TRACE_SAMPLE_RATE:10000} # The sample rate precision is 1/10000. 10000 means 100% sample in default.

receiver-jvm:

  default:

#service-mesh:

#  default:

#    bufferPath: ${SW_SERVICE_MESH_BUFFER_PATH:../mesh-buffer/}  # Path to trace buffer files, suggest to use absolute path

#    bufferOffsetMaxFileSize: ${SW_SERVICE_MESH_OFFSET_MAX_FILE_SIZE:100} # Unit is MB

#    bufferDataMaxFileSize: ${SW_SERVICE_MESH_BUFFER_DATA_MAX_FILE_SIZE:500} # Unit is MB

#    bufferFileCleanWhenRestart: ${SW_SERVICE_MESH_BUFFER_FILE_CLEAN_WHEN_RESTART:false}

#istio-telemetry:

#  default:

#receiver_zipkin:

#  default:

#    host: ${SW_RECEIVER_ZIPKIN_HOST:0.0.0.0}

#    port: ${SW_RECEIVER_ZIPKIN_PORT:9411}

#    contextPath: ${SW_RECEIVER_ZIPKIN_CONTEXT_PATH:/}

 03 页面介绍

访问地址：http://localhost:8080/

首页：

调用关系

服务调用信息

追踪日志信息

04 Agent 使用示例

Skywalking 采用 Java 探针技术（java agent 博客），对客户端应用程序没有任何代码侵入，使用起来简单方便，当然其具体实现就是需要针对不同的框架及服务提供探针插件。

使用命令：

java -javaagent:G:\github\incubator-skywalking\skywalking-agent\skywalking-agent.jar

-Dskywalking.agent.service_name=test  -jar app.jar

这样就可以完成对目前应用 app.jar 的监控

Tomcat 监控

Tomcat 7 修改tomcat/bin/catalina.sh，在首行加入如下信息

CATALINA_OPTS="$CATALINA_OPTS -javaagent:/path/to/skywalking-agent/skywalking-agent.jar"; export CATALINA_OPTS

Tomcat 8 修改tomcat/bin/catalina.sh，在首行加入如下信

set "CATALINA_OPTS=... -javaagent:E:\apache-tomcat-8.5.20\skywalking-agent\skywalking-agent.jar"

 

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