分布式应用，会存在各种问题。而要解决这些难题，除了要应用自己做一些监控埋点外，还应该有一些外围的系统进行主动探测，主动发现。

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APM工具就是干这活的，SkyWalking 是国人开源的一款优秀的APM应用，已成为apache的顶级项目。

今天我们就来实践下 SkyWalking 下吧。

实践目标： 达到监控现有的几个系统，清楚各调用关系，可以找到出性能问题点。

实践步骤：

1. SkyWalking 服务端安装运行；

2. 应用端的接入；

3. 后台查看效果；

4. 分析排查问题；

5. 深入了解（如有心情）；

6. SkyWalking 服务端安装

下载应用包:

# 主下载页
 http://skywalking.apache.org/downloads/
 # 点开具体下载地址后进行下载，如：
 wget http://mirrors.tuna.tsinghua.edu.cn/apache/skywalking/6.5.0/apache-skywalking-apm-6.5.0.tar.gz

解压安装包:

 tar -xzvf apache-skywalking-apm-6.5.0.tar.gz

使用默认配置端口，默认存储方式 h3, 直接启动服务：

  ./bin/startup.sh

好产品就是这么简单！

现在服务端就启起来了，可以打开后台地址查看(默认是8080端口): http://localhost:8080 界面如下：

当然，上面是已存在应用的页面。现在你是看不到任何应用的，因为你还没有接入嘛。

2. 应用端的接入

我们只以java应用接入方式实践。

直接使用 javaagent 进行启动即可：

java -javaagent:/root/skywalking/agent/skywalking-agent.jar -Dskywalking.agent.service_name=app1 -Dskywalking.collector.backend_service=localhost:11800 -jar myapp.jar

参数说明：

# 参数解释
 skywalking.agent.service_name: 本应用在skywalking中的名称
 skywalking.collector.backend_service: skywalking 服务端地址，grpc上报地址，默认端口是 11800
 # 上面两个参数也可以使用另外的表现形式
 SW_AGENT_COLLECTOR_BACKEND_SERVICES: 与 skywalking.collector.backend_service 含义相同
 SW_AGENT_NAME: 与 skywalking.agent.service_name 含义相同

随便访问几个接口或页面，使监控抓取到数据。

再回管理页面，已经看到有节点了。截图如上。

现在我们还可以查看各应用之间的关系了!

关系清晰吧！一目了然，代码再复杂也不怕了。

我们还可以追踪具体链路：

只要知道问题发生的时间点，即可以很快定位到发生问题的接口、系统，快速解决。

3. SkyWalking 配置文件

如上，我们并没有改任何配置文件，就让系统跑起来了。幸运的同时，我们应该要知道更多！至少配置得知道。

config/application.yml : 收集器服务端配置

webapp/webapp.yml : 配置 Web 的端口及获取数据的 OAP(Collector)的IP和端口

agent/config/agent.config : 配置 Agent 信息，如 Skywalking OAP(Collector)的地址和名称

下面是 skywalking 的默认配置，我们可以不用更改就能跑起来一个样例！更改以生产化配置！

config/application.yml

cluster:
 standalone:
 # Please check your ZooKeeper is 3.5+, However, it is also compatible with ZooKeeper 3.4.x. Replace the ZooKeeper 3.5+
 # library the oap-libs folder with your ZooKeeper 3.4.x library.
# zookeeper:
# nameSpace: ${SW_NAMESPACE:""}
# hostPort: ${SW_CLUSTER_ZK_HOST_PORT:localhost:2181}
# #Retry Policy
# baseSleepTimeMs: ${SW_CLUSTER_ZK_SLEEP_TIME:1000} # initial amount of time to wait between retries
# maxRetries: ${SW_CLUSTER_ZK_MAX_RETRIES:3} # max number of times to retry
# # Enable ACL
# enableACL: ${SW_ZK_ENABLE_ACL:false} # disable ACL in default
# schema: ${SW_ZK_SCHEMA:digest} # only support digest schema
# expression: ${SW_ZK_EXPRESSION:skywalking:skywalking}
# kubernetes:
# watchTimeoutSeconds: ${SW_CLUSTER_K8S_WATCH_TIMEOUT:60}
# namespace: ${SW_CLUSTER_K8S_NAMESPACE:default}
# labelSelector: ${SW_CLUSTER_K8S_LABEL:app=collector,release=skywalking}
# uidEnvName: ${SW_CLUSTER_K8S_UID:SKYWALKING_COLLECTOR_UID}
# consul:
# serviceName: ${SW_SERVICE_NAME:"SkyWalking_OAP_Cluster"}
# Consul cluster nodes, example: 10.0.0.1:8500,10.0.0.2:8500,10.0.0.3:8500
# hostPort: ${SW_CLUSTER_CONSUL_HOST_PORT:localhost:8500}
# nacos:
# serviceName: ${SW_SERVICE_NAME:"SkyWalking_OAP_Cluster"}
# hostPort: ${SW_CLUSTER_NACOS_HOST_PORT:localhost:8848}
# # Nacos Configuration namespace
# namespace: 'public'
# etcd:
# serviceName: ${SW_SERVICE_NAME:"SkyWalking_OAP_Cluster"}
# etcd cluster nodes, example: 10.0.0.1:2379,10.0.0.2:2379,10.0.0.3:2379
# hostPort: ${SW_CLUSTER_ETCD_HOST_PORT:localhost:2379}
core:
 default:
 # Mixed: Receive agent data, Level 1 aggregate, Level 2 aggregate
 # Receiver: Receive agent data, Level 1 aggregate
 # Aggregator: Level 2 aggregate
 role: ${SW_CORE_ROLE:Mixed} # Mixed/Receiver/Aggregator
 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 metrics data. After the timeout has expired, the metrics data will automatically be deleted.
 enableDataKeeperExecutor: ${SW_CORE_ENABLE_DATA_KEEPER_EXECUTOR:true} # Turn it off then automatically metrics data delete will be close.
 dataKeeperExecutePeriod: ${SW_CORE_DATA_KEEPER_EXECUTE_PERIOD:5} # How often the data keeper executor runs periodically, unit is minute
 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
 # Cache metric data for 1 minute to reduce database queries, and if the OAP cluster changes within that minute,
 # the metrics may not be accurate within that minute.
 enableDatabaseSession: ${SW_CORE_ENABLE_DATABASE_SESSION:true}
storage:
# elasticsearch:
# nameSpace: ${SW_NAMESPACE:""}
# clusterNodes: ${SW_STORAGE_ES_CLUSTER_NODES:localhost:9200}
# protocol: ${SW_STORAGE_ES_HTTP_PROTOCOL:"http"}
# trustStorePath: ${SW_SW_STORAGE_ES_SSL_JKS_PATH:"../es_keystore.jks"}
# trustStorePass: ${SW_SW_STORAGE_ES_SSL_JKS_PASS:""}
# user: ${SW_ES_USER:""}
# password: ${SW_ES_PASSWORD:""}
# indexShardsNumber: ${SW_STORAGE_ES_INDEX_SHARDS_NUMBER:2}
# indexReplicasNumber: ${SW_STORAGE_ES_INDEX_REPLICAS_NUMBER:0}
# # Those data TTL settings will override the same settings in core module.
# recordDataTTL: ${SW_STORAGE_ES_RECORD_DATA_TTL:7} # Unit is day
# otherMetricsDataTTL: ${SW_STORAGE_ES_OTHER_METRIC_DATA_TTL:45} # Unit is day
# monthMetricsDataTTL: ${SW_STORAGE_ES_MONTH_METRIC_DATA_TTL:18} # Unit is month
# # 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:1000} # Execute the bulk every 1000 requests
# 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
# resultWindowMaxSize: ${SW_STORAGE_ES_QUERY_MAX_WINDOW_SIZE:10000}
# metadataQueryMaxSize: ${SW_STORAGE_ES_QUERY_MAX_SIZE:5000}
# segmentQueryMaxSize: ${SW_STORAGE_ES_QUERY_SEGMENT_SIZE:200}
 h3:
 driver: ${SW_STORAGE_H2_DRIVER:org.h3.jdbcx.JdbcDataSource}
 url: ${SW_STORAGE_H2_URL:jdbc:h3:mem:skywalking-oap-db}
 user: ${SW_STORAGE_H2_USER:sa}
 metadataQueryMaxSize: ${SW_STORAGE_H2_QUERY_MAX_SIZE:5000}
# MySQL:
# properties:
# jdbcUrl: ${SW_JDBC_URL:"jdbc:mysql://localhost:3306/swtest"}
# dataSource.user: ${SW_DATA_SOURCE_USER:root}
# dataSource.password: ${SW_DATA_SOURCE_PASSWORD:root@1234}
# dataSource.cachePrepStmts: ${SW_DATA_SOURCE_CACHE_PREP_STMTS:true}
# dataSource.prepStmtCacheSize: ${SW_DATA_SOURCE_PREP_STMT_CACHE_SQL_SIZE:250}
# dataSource.prepStmtCacheSqlLimit: ${SW_DATA_SOURCE_PREP_STMT_CACHE_SQL_LIMIT:2048}
# dataSource.useServerPrepStmts: ${SW_DATA_SOURCE_USE_SERVER_PREP_STMTS:true}
# metadataQueryMaxSize: ${SW_STORAGE_MYSQL_QUERY_MAX_SIZE:5000}
receiver-sharing-server:
 default:
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.
 slowDBAccessThreshold: ${SW_SLOW_DB_THRESHOLD:default:200,MongoDB:100} # The slow database access thresholds. Unit ms.
receiver-jvm:
 default:
receiver-clr:
 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:
envoy-metric:
 default:
# alsHTTPAnalysis: ${SW_ENVOY_METRIC_ALS_HTTP_ANALYSIS:k8s-mesh}
#receiver_zipkin:
# default:
# host: ${SW_RECEIVER_ZIPKIN_HOST:0.0.0.0}
# port: ${SW_RECEIVER_ZIPKIN_PORT:9411}
# contextPath: ${SW_RECEIVER_ZIPKIN_CONTEXT_PATH:/}
query:
 graphql:
 path: ${SW_QUERY_GRAPHQL_PATH:/graphql}
alarm:
 default:
telemetry:
 none:
configuration:
 none:
# apollo:
# apolloMeta: http://106.12.25.204:8080
# apolloCluster: default
# # apolloEnv: # defaults to null
# appId: skywalking
# period: 5
# nacos:
# # Nacos Server Host
# serverAddr: 127.0.0.1
# # Nacos Server Port
# port: 8848
# # Nacos Configuration Group
# group: 'skywalking'
# # Nacos Configuration namespace
# namespace: ''
# # Unit seconds, sync period. Default fetch every 60 seconds.
# period : 60
# # the name of current cluster, set the name if you want to upstream system known.
# clusterName: "default"
# zookeeper:
# period : 60 # Unit seconds, sync period. Default fetch every 60 seconds.
# nameSpace: /default
# hostPort: localhost:2181
# #Retry Policy
# baseSleepTimeMs: 1000 # initial amount of time to wait between retries
# maxRetries: 3 # max number of times to retry
# etcd:
# period : 60 # Unit seconds, sync period. Default fetch every 60 seconds.
# group : 'skywalking'
# serverAddr: localhost:2379
# clusterName: "default"
# consul:
# # Consul host and ports, separated by comma, e.g. 1.2.3.4:8500,2.3.4.5:8500
# hostAndPorts: ${consul.address}
# # Sync period in seconds. Defaults to 60 seconds.
# period: 1

#exporter:
# grpc:
# targetHost: ${SW_EXPORTER_GRPC_HOST:127.0.0.1}
# targetPort: ${SW_EXPORTER_GRPC_PORT:9870}

webapp/webapp.yml

 server:
 port: 8080

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

agent/config/agent.config

 # The agent namespace
# agent.namespace=${SW_AGENT_NAMESPACE:default-namespace}

# The service name in UI
agent.service_name=${SW_AGENT_NAME:Your_ApplicationName}

# The number of sampled traces per 3 seconds
# Negative number means sample traces as many as possible, most likely 100%
# agent.sample_n_per_3_secs=${SW_AGENT_SAMPLE:-1}

# Authentication active is based on backend setting, see application.yml for more details.
# agent.authentication = ${SW_AGENT_AUTHENTICATION:xxxx}

# The max amount of spans in a single segment.
# Through this config item, skywalking keep your application memory cost estimated.
# agent.span_limit_per_segment=${SW_AGENT_SPAN_LIMIT:300}

# Ignore the segments if their operation names end with these suffix.
# agent.ignore_suffix=${SW_AGENT_IGNORE_SUFFIX:.jpg,.jpeg,.js,.css,.png,.bmp,.gif,.ico,.mp3,.mp4,.html,.svg}

# If true, skywalking agent will save all instrumented classes files in `/debugging` folder.
# Skywalking team may ask for these files in order to resolve compatible problem.
# agent.is_open_debugging_class = ${SW_AGENT_OPEN_DEBUG:true}

# The operationName max length
# agent.operation_name_threshold=${SW_AGENT_OPERATION_NAME_THRESHOLD:500}

# Backend service addresses.
collector.backend_service=${SW_AGENT_COLLECTOR_BACKEND_SERVICES:127.0.0.1:11800}

# Logging file_name
logging.file_name=${SW_LOGGING_FILE_NAME:skywalking-api.log}

# Logging level
logging.level=${SW_LOGGING_LEVEL:DEBUG}

# Logging dir
# logging.dir=${SW_LOGGING_DIR:""}

# Logging max_file_size, default: 300 * 1024 * 1024 = 314572800
# logging.max_file_size=${SW_LOGGING_MAX_FILE_SIZE:314572800}

# The max history log files. When rollover happened, if log files exceed this number,
# then the oldest file will be delete. Negative or zero means off, by default.
# logging.max_history_files=${SW_LOGGING_MAX_HISTORY_FILES:-1}

# mysql plugin configuration
# plugin.mysql.trace_sql_parameters=${SW_MYSQL_TRACE_SQL_PARAMETERS:false}

4. SkyWalking 架构

来自官网的图片，感受一下！无须细说，大概原理就是： 针对各种不同客户端实现不同的指标采集，统一通过grpc/http发送到apm服务端，然后经过分析引擎后存储到es/h3/mysql等等存储系统，最后由前端通过查询引擎进行展现。

5. 可以用来干啥

发现系统耗时或者说瓶颈在哪里。

发现各系统之间的调用关系。

监控服务异常。

排查系统故障。

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