SkyWalking 概述
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。支持Java, .Net Core, PHP, NodeJS, Golang, LUA语言探针,支持Envoy + Istio构建的Service Mesh。
这里抛出两个概念,SkyWalking 服务和语言探针。SkyWalking 本身是用 Java 写的,作为应用性能管理系统,探针是收集应用性能指标数据的,比如在 .net core 项目中引入 SkyAPM.Agent.AspNetCore,做一些配置,就可以将该项目的数据报告给 SkyWalking 服务,在 SkyWalking UI 界面看到可视化的数据。
SkyWalking 展示的数据是需要存储的,默认是 H2,同时也支持使用ElasticSearch、MySQL、TiDB、InfluxDB,这里使用 elasticsearch。
环境说明
本机开发环境:Win10 + VS2019,服务器是 CentOS,ip:172.17.81.23
Docker 方式(踩坑)
安装 Elasticsearch
docker run --name elasticsearch --restart always -d -p 9200:9200 -p 9300:9300 -e "discovery.type=single-node" elasticsearch:7.8.1
安装 Skywalking
docker run --name skywalking --restart always -d -p 11800:11800 -p 12800:12800 --link elasticsearch:elasticsearch -e SW_STORAGE=elasticsearch -e SW_STORAGE_ES_CLUSTER_NODES=elasticsearch:9200 apache/skywalking-oap-server:8.1.0-es7
安装 SkyWalking-UI
docker run --name skywalking-ui --restart always -d -p 8080:8080 --link skywalking:skywalking -e SW_OAP_ADDRESS=skywalking:12800 apache/skywalking-ui:8.1.0
本机访问 skywalking 服务,然而页面一片空白,审查元素发现这么一句话:We're sorry but SkyWalking doesn't work properly without JavaScript enabled.Please enable it to continue.
查看 Docker 服务,发现 SkyWalking 一直在 restart 状态。查看 dockerr 日志,skywalking 连接到 elasticsearch 超时。
Docker Compose 方式(踩坑)
说明:用到的 compose 文件版本是 3.8,需要 Docker 版本在 19.03.0 或更新的版本。
mkdir skywalking cd skywalking
vi docker-compose.yml
# 内容见 https://github.com/apache/skywalking-docker/blob/master/8/8.1.0/compose-es7/docker-compose.yml docker-compose up -d
# Licensed to the Apache Software Foundation (ASF) under one # or more contributor license agreements. See the NOTICE file # distributed with this work for additional information # regarding copyright ownership. The ASF licenses this file # to you under the Apache License, Version 2.0 (the # "License"); you may not use this file except in compliance # with the License. You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. version: '3.8' services: elasticsearch: image: docker.elastic.co/elasticsearch/elasticsearch:7.5.0 container_name: elasticsearch restart: always ports: - 9200:9200 healthcheck: test: ["CMD-SHELL", "curl --silent --fail localhost:9200/_cluster/health || exit 1"] interval: 30s timeout: 10s retries: 3 start_period: 40s environment: - discovery.type=single-node - bootstrap.memory_lock=true - "ES_JAVA_OPTS=-Xms512m -Xmx512m" ulimits: memlock: soft: -1 hard: -1 oap: image: apache/skywalking-oap-server:8.1.0-es7 container_name: oap depends_on: - elasticsearch links: - elasticsearch restart: always ports: - 11800:11800 - 12800:12800 healthcheck: test: ["CMD-SHELL", "/skywalking/bin/swctl"] interval: 30s timeout: 10s retries: 3 start_period: 40s environment: SW_STORAGE: elasticsearch7 SW_STORAGE_ES_CLUSTER_NODES: elasticsearch:9200 ui: image: apache/skywalking-ui:8.1.0 container_name: ui depends_on: - oap links: - oap restart: always ports: - 8080:8080 environment: SW_OAP_ADDRESS: oap:12800
启动之后可以看到 docker 服务状态正常。状态也是 healthy,总算放心了。
本机访问 SkyWalking 服务地址,UI 暴露端口是 8080. 审查网络,没有错误。
Asp.Net Core 项目应用
创建一个 WebAPI 项目,在项目中引用 NuGet 包:SkyAPM.Agent.AspNetCore,当前版本是 0.9.0
在项目根目录下新增 skyapm.json 配置文件。gRPC 下 的 Servers 为 SkyWalking 服务地址,注意替换成自己的服务地址。
{ "SkyWalking": { "ServiceName": "skyapm", "Namespace": "", "HeaderVersions": [ "sw6" ], "Sampling": { "SamplePer3Secs": -1, "Percentage": -1.0 }, "Logging": { "Level": "Information", "FilePath": "logs\\skyapm-{Date}.log" }, "Transport": { "Interval": 3000, "ProtocolVersion": "v6", "QueueSize": 30000, "BatchSize": 3000, "gRPC": { "Servers": "172.17.81.23:11800", "Timeout": 10000, "ConnectTimeout": 10000, "ReportTimeout": 600000 } } } }
也可以通过命令行工具来生成配置文件。安装 SkyAPM.DotNet.CLI,在项目根目录下使用 CLI 命令生成 SkyWalking 配置文件。命令规则是:dotnet skyapm config [your_service_name] [your_servers]
dotnet tool install -g SkyAPM.DotNet.CLI
dotnet skyapm config skyapm 172.17.81.23:11800
启动项目,没有异常,但是也没有展示出数据。查看日志,发现服务注册失败。
[skyapm] [Error] SkyApm.Transport.Grpc.V6.ServiceRegister : Register service fail. Grpc.Core.RpcException: Status(StatusCode=Unimplemented, Detail="Method not found: Register/doServiceRegister") at SkyApm.Transport.Grpc.V6.ServiceRegister.
翻看源码,查找GitHub issue,原来这个注册方法是 SkyWalking v7.0 中的方法,新的版本中是没有这个方法的。
破案了,SkyAPM.Agent.AspNetCore 这个 NuGet 包有一年未更新了,不支持 SkyWalking 8,在 .Net Core 项目中需要使用 SkyWalking v7 或更低的版本。
Docker 方式(√)
SW7.0 之后的版本是用不了了,所以目前只能用 7.0 版本。
docker run --name elasticsearch --restart always -d -p 9200:9200 -p 9300:9300 -e "discovery.type=single-node" elasticsearch:7.8.1 docker run --name skywalking --restart always -d -p 11800:11800 -p 12800:12800 --link elasticsearch:elasticsearch -e SW_STORAGE=elasticsearch7 -e SW_STORAGE_ES_CLUSTER_NODES=elasticsearch:9200 apache/skywalking-oap-server:7.0.0-es7 docker run --name skywalking-ui --restart always -d -p 8080:8080 --link skywalking:skywalking -e SW_OAP_ADDRESS=skywalking:12800 apache/skywalking-ui:7.0.0
Docker Compose 方式(√)
将 docker-compose.yml 的内容替换成这个版本:https://github.com/apache/skywalking-docker/blob/master/7/7.0/compose-es7/docker-compose.yml。6.6版本亲测可行。
version: '3.3' services: elasticsearch: image: docker.elastic.co/elasticsearch/elasticsearch:7.5.0 container_name: elasticsearch restart: always ports: - 9200:9200 environment: - discovery.type=single-node - bootstrap.memory_lock=true - "ES_JAVA_OPTS=-Xms512m -Xmx512m" ulimits: memlock: soft: -1 hard: -1 oap: image: apache/skywalking-oap-server:7.0.0-es7 container_name: oap depends_on: - elasticsearch links: - elasticsearch restart: always ports: - 11800:11800 - 12800:12800 environment: SW_STORAGE: elasticsearch7 SW_STORAGE_ES_CLUSTER_NODES: elasticsearch:9200 ui: image: apache/skywalking-ui:7.0.0 container_name: ui depends_on: - oap links: - oap restart: always ports: - 8080:8080 environment: SW_OAP_ADDRESS: oap:12800
docker-compose 启动之后大概1分钟,启动 api 项目,查看日志,没有异常。访问 api 项目,查看 SkyWalking UI,激动人心的时刻终于到来了。
总结
SkyWalking 不同语言探针不是同一个团队开发的,SkyAPM-dotnet 也没怎么更新了,在 .NetCore 平台使用 SkyWalking 作为 APM,一定要选对版本,不要盲目求新啊