Spring Boot 2.x監控數據可視化(Actuator + Prometheus + Grafana手把手)

本文轉載自查看原文 2019-11-11 11:27 364

TIPS

本文基於Spring Boot 2.1.4，理論支持Spring Boot 2.x所有版本

眾所周知，Spring Boot有個子項目Spring Boot Actuator，它為應用提供了強大的監控能力。從Spring Boot 2.0開始，Actuator將底層改為Micrometer，提供了更強、更靈活的監控能力。Micrometer是一個監控門面，可以類比成監控界的 Slf4j 。

借助Micrometer，應用能夠對接各種監控系統，例如：

下面演示如何對接 Prometheus ，並使用 Grafana 實現數據的可視化。

TIPS

童鞋們對Prometheus或Grafana不熟悉也沒關系，本文是手把手文章，按步驟操作即可。

編碼

編寫代碼

加依賴

<dependency>  <groupId>org.springframework.boot</groupId>  <artifactId>spring-boot-starter-actuator</artifactId></dependency><dependency>  <groupId>io.micrometer</groupId>  <artifactId>micrometer-registry-prometheus</artifactId></dependency>

這里，我們為應用引入了 micrometer-registry-prometheus ，事實上，你想對接上文列表中的哪款監控系統，就寫啥。例如想對接 Influx ，則需添加依賴 micrometer-registry-influx 。

寫配置
```
server:  port: 8080spring:  application:    name: prometheus-testmanagement:  endpoints:    web:      exposure:        include: 'prometheus'  metrics:    tags:      application: ${spring.application.name}
```
如配置所示，指定應用名為 prometheus-test ，並將 Actuator 的 /actuator/prometheus 端點暴露出來； management.metrics.tags.application=prometheus-test 作用是為指標設置一個名為application="prometheus-test" 的Tag，Tag是Prometheus提供的一種能力，從而實現更加靈活的篩選。

測試

啟動應用

訪問 http://localhost:8080/actuator/prometheus 可獲得類似如下的結果：

# HELP jvm_memory_used_bytes The amount of used memory# TYPE jvm_memory_used_bytes gaugejvm_memory_used_bytes{application="prometheus-test",area="heap",id="PS Old Gen",} 2.1193976E7jvm_memory_used_bytes{application="prometheus-test",area="nonheap",id="Metaspace",} 3.8791688E7jvm_memory_used_bytes{application="prometheus-test",area="heap",id="PS Survivor Space",} 0.0jvm_memory_used_bytes{application="prometheus-test",area="nonheap",id="Compressed Class Space",} 5303976.0jvm_memory_used_bytes{application="prometheus-test",area="heap",id="PS Eden Space",} 8.2574816E7jvm_memory_used_bytes{application="prometheus-test",area="nonheap",id="Code Cache",} 8693824.0# HELP tomcat_global_received_bytes_total  # TYPE tomcat_global_received_bytes_total countertomcat_global_received_bytes_total{application="prometheus-test",name="http-nio-8080",} 0.0# HELP jvm_threads_daemon_threads The current number of live daemon threads# TYPE jvm_threads_daemon_threads gaugejvm_threads_daemon_threads{application="prometheus-test",} 20.0# HELP tomcat_sessions_alive_max_seconds  # TYPE tomcat_sessions_alive_max_seconds gaugetomcat_sessions_alive_max_seconds{application="prometheus-test",} 0.0# HELP jvm_buffer_memory_used_bytes An estimate of the memory that the Java virtual machine is using for this buffer pool# TYPE jvm_buffer_memory_used_bytes gaugejvm_buffer_memory_used_bytes{application="prometheus-test",id="mapped",} 0.0jvm_buffer_memory_used_bytes{application="prometheus-test",id="direct",} 90112.0# HELP jvm_threads_states_threads The current number of threads having NEW state# TYPE jvm_threads_states_threads gaugejvm_threads_states_threads{application="prometheus-test",state="runnable",} 9.0jvm_threads_states_threads{application="prometheus-test",state="new",} 0.0jvm_threads_states_threads{application="prometheus-test",state="terminated",} 0.0jvm_threads_states_threads{application="prometheus-test",state="blocked",} 0.0jvm_threads_states_threads{application="prometheus-test",state="waiting",} 12.0jvm_threads_states_threads{application="prometheus-test",state="timed-waiting",} 3.0# HELP process_cpu_usage The "recent cpu usage" for the Java Virtual Machine process# TYPE process_cpu_usage gaugeprocess_cpu_usage{application="prometheus-test",} 0.0030590633504868434# HELP logback_events_total Number of error level events that made it to the logs# TYPE logback_events_total counterlogback_events_total{application="prometheus-test",level="info",} 7.0logback_events_total{application="prometheus-test",level="warn",} 0.0logback_events_total{application="prometheus-test",level="trace",} 0.0logback_events_total{application="prometheus-test",level="debug",} 0.0logback_events_total{application="prometheus-test",level="error",} 0.0# HELP tomcat_global_sent_bytes_total  # TYPE tomcat_global_sent_bytes_total countertomcat_global_sent_bytes_total{application="prometheus-test",name="http-nio-8080",} 195356.0# HELP process_files_max_files The maximum file descriptor count# TYPE process_files_max_files gaugeprocess_files_max_files{application="prometheus-test",} 10240.0# HELP tomcat_threads_busy_threads  # TYPE tomcat_threads_busy_threads gaugetomcat_threads_busy_threads{application="prometheus-test",name="http-nio-8080",} 1.0# HELP process_files_open_files The open file descriptor count# TYPE process_files_open_files gaugeprocess_files_open_files{application="prometheus-test",} 101.0# HELP tomcat_sessions_active_current_sessions  # TYPE tomcat_sessions_active_current_sessions gaugetomcat_sessions_active_current_sessions{application="prometheus-test",} 0.0# HELP jvm_classes_unloaded_classes_total The total number of classes unloaded since the Java virtual machine has started execution# TYPE jvm_classes_unloaded_classes_total counterjvm_classes_unloaded_classes_total{application="prometheus-test",} 2.0# HELP jvm_memory_committed_bytes The amount of memory in bytes that is committed for the Java virtual machine to use# TYPE jvm_memory_committed_bytes gaugejvm_memory_committed_bytes{application="prometheus-test",area="heap",id="PS Old Gen",} 1.5466496E8jvm_memory_committed_bytes{application="prometheus-test",area="nonheap",id="Metaspace",} 4.1418752E7jvm_memory_committed_bytes{application="prometheus-test",area="heap",id="PS Survivor Space",} 1.6252928E7jvm_memory_committed_bytes{application="prometheus-test",area="nonheap",id="Compressed Class Space",} 5767168.0jvm_memory_committed_bytes{application="prometheus-test",area="heap",id="PS Eden Space",} 1.73539328E8jvm_memory_committed_bytes{application="prometheus-test",area="nonheap",id="Code Cache",} 8716288.0# HELP http_server_requests_seconds  # TYPE http_server_requests_seconds summaryhttp_server_requests_seconds_count{application="prometheus-test",exception="None",method="GET",outcome="SUCCESS",status="200",uri="/actuator/prometheus",} 16.0http_server_requests_seconds_sum{application="prometheus-test",exception="None",method="GET",outcome="SUCCESS",status="200",uri="/actuator/prometheus",} 0.326299973http_server_requests_seconds_count{application="prometheus-test",exception="None",method="GET",outcome="SUCCESS",status="200",uri="/**/favicon.ico",} 3.0http_server_requests_seconds_sum{application="prometheus-test",exception="None",method="GET",outcome="SUCCESS",status="200",uri="/**/favicon.ico",} 0.028434427# HELP http_server_requests_seconds_max  # TYPE http_server_requests_seconds_max gaugehttp_server_requests_seconds_max{application="prometheus-test",exception="None",method="GET",outcome="SUCCESS",status="200",uri="/actuator/prometheus",} 0.120627904http_server_requests_seconds_max{application="prometheus-test",exception="None",method="GET",outcome="SUCCESS",status="200",uri="/**/favicon.ico",} 0.015596512# HELP tomcat_global_error_total  # TYPE tomcat_global_error_total countertomcat_global_error_total{application="prometheus-test",name="http-nio-8080",} 0.0# HELP jvm_gc_max_data_size_bytes Max size of old generation memory pool# TYPE jvm_gc_max_data_size_bytes gaugejvm_gc_max_data_size_bytes{application="prometheus-test",} 2.863661056E9# HELP jvm_gc_live_data_size_bytes Size of old generation memory pool after a full GC# TYPE jvm_gc_live_data_size_bytes gaugejvm_gc_live_data_size_bytes{application="prometheus-test",} 2.1193976E7# HELP system_load_average_1m The sum of the number of runnable entities queued to available processors and the number of runnable entities running on the available processors averaged over a period of time# TYPE system_load_average_1m gaugesystem_load_average_1m{application="prometheus-test",} 3.9423828125# HELP process_uptime_seconds The uptime of the Java virtual machine# TYPE process_uptime_seconds gaugeprocess_uptime_seconds{application="prometheus-test",} 173.424# HELP tomcat_sessions_expired_sessions_total  # TYPE tomcat_sessions_expired_sessions_total countertomcat_sessions_expired_sessions_total{application="prometheus-test",} 0.0# HELP jvm_gc_pause_seconds Time spent in GC pause# TYPE jvm_gc_pause_seconds summaryjvm_gc_pause_seconds_count{action="end of minor GC",application="prometheus-test",cause="Metadata GC Threshold",} 1.0jvm_gc_pause_seconds_sum{action="end of minor GC",application="prometheus-test",cause="Metadata GC Threshold",} 0.012jvm_gc_pause_seconds_count{action="end of major GC",application="prometheus-test",cause="Metadata GC Threshold",} 1.0jvm_gc_pause_seconds_sum{action="end of major GC",application="prometheus-test",cause="Metadata GC Threshold",} 0.045# HELP jvm_gc_pause_seconds_max Time spent in GC pause# TYPE jvm_gc_pause_seconds_max gaugejvm_gc_pause_seconds_max{action="end of minor GC",application="prometheus-test",cause="Metadata GC Threshold",} 0.012jvm_gc_pause_seconds_max{action="end of major GC",application="prometheus-test",cause="Metadata GC Threshold",} 0.045# HELP jvm_gc_memory_promoted_bytes_total Count of positive increases in the size of the old generation memory pool before GC to after GC# TYPE jvm_gc_memory_promoted_bytes_total counterjvm_gc_memory_promoted_bytes_total{application="prometheus-test",} 1.06878E7# HELP jvm_gc_memory_allocated_bytes_total Incremented for an increase in the size of the young generation memory pool after one GC to before the next# TYPE jvm_gc_memory_allocated_bytes_total counterjvm_gc_memory_allocated_bytes_total{application="prometheus-test",} 7.8713648E7# HELP tomcat_global_request_seconds  # TYPE tomcat_global_request_seconds summarytomcat_global_request_seconds_count{application="prometheus-test",name="http-nio-8080",} 19.0tomcat_global_request_seconds_sum{application="prometheus-test",name="http-nio-8080",} 0.432# HELP jvm_threads_live_threads The current number of live threads including both daemon and non-daemon threads# TYPE jvm_threads_live_threads gaugejvm_threads_live_threads{application="prometheus-test",} 24.0# HELP jvm_buffer_count_buffers An estimate of the number of buffers in the pool# TYPE jvm_buffer_count_buffers gaugejvm_buffer_count_buffers{application="prometheus-test",id="mapped",} 0.0jvm_buffer_count_buffers{application="prometheus-test",id="direct",} 11.0# HELP process_start_time_seconds Start time of the process since unix epoch.# TYPE process_start_time_seconds gaugeprocess_start_time_seconds{application="prometheus-test",} 1.556017153576E9# HELP tomcat_threads_config_max_threads  # TYPE tomcat_threads_config_max_threads gaugetomcat_threads_config_max_threads{application="prometheus-test",name="http-nio-8080",} 200.0# HELP system_cpu_count The number of processors available to the Java virtual machine# TYPE system_cpu_count gaugesystem_cpu_count{application="prometheus-test",} 8.0# HELP tomcat_threads_current_threads  # TYPE tomcat_threads_current_threads gaugetomcat_threads_current_threads{application="prometheus-test",name="http-nio-8080",} 10.0# HELP jvm_memory_max_bytes The maximum amount of memory in bytes that can be used for memory management# TYPE jvm_memory_max_bytes gaugejvm_memory_max_bytes{application="prometheus-test",area="heap",id="PS Old Gen",} 2.863661056E9jvm_memory_max_bytes{application="prometheus-test",area="nonheap",id="Metaspace",} -1.0jvm_memory_max_bytes{application="prometheus-test",area="heap",id="PS Survivor Space",} 1.6252928E7jvm_memory_max_bytes{application="prometheus-test",area="nonheap",id="Compressed Class Space",} 1.073741824E9jvm_memory_max_bytes{application="prometheus-test",area="heap",id="PS Eden Space",} 1.395654656E9jvm_memory_max_bytes{application="prometheus-test",area="nonheap",id="Code Cache",} 2.5165824E8# HELP jvm_threads_peak_threads The peak live thread count since the Java virtual machine started or peak was reset# TYPE jvm_threads_peak_threads gaugejvm_threads_peak_threads{application="prometheus-test",} 29.0# HELP jvm_classes_loaded_classes The number of classes that are currently loaded in the Java virtual machine# TYPE jvm_classes_loaded_classes gaugejvm_classes_loaded_classes{application="prometheus-test",} 7936.0# HELP tomcat_sessions_active_max_sessions  # TYPE tomcat_sessions_active_max_sessions gaugetomcat_sessions_active_max_sessions{application="prometheus-test",} 0.0# HELP tomcat_global_request_max_seconds  # TYPE tomcat_global_request_max_seconds gaugetomcat_global_request_max_seconds{application="prometheus-test",name="http-nio-8080",} 0.161# HELP tomcat_sessions_created_sessions_total  # TYPE tomcat_sessions_created_sessions_total countertomcat_sessions_created_sessions_total{application="prometheus-test",} 0.0# HELP tomcat_sessions_rejected_sessions_total  # TYPE tomcat_sessions_rejected_sessions_total countertomcat_sessions_rejected_sessions_total{application="prometheus-test",} 0.0# HELP jvm_buffer_total_capacity_bytes An estimate of the total capacity of the buffers in this pool# TYPE jvm_buffer_total_capacity_bytes gaugejvm_buffer_total_capacity_bytes{application="prometheus-test",id="mapped",} 0.0jvm_buffer_total_capacity_bytes{application="prometheus-test",id="direct",} 90112.0# HELP system_cpu_usage The "recent cpu usage" for the whole system# TYPE system_cpu_usage gaugesystem_cpu_usage{application="prometheus-test",} 0.2523364485981308

該端點返回的數據結構是Prometheus需要使用的。對照注釋，相信大家能看懂每一項的含義。例如：

# HELP jvm_memory_used_bytes The amount of used memory# TYPE jvm_memory_used_bytes gaugejvm_memory_used_bytes{application="prometheus-test",area="heap",id="PS Old Gen",} 2.1193976E7

表示：prometheus-test 應用堆內存中的 PS Old Gen 區域占用的空間是 2.1193976E7 字節。

對接Prometheus

Prometheus是一款開源的監控 + 時序數據庫 + 報警軟件，由SoundCloud公司開發的。目前在CNCF基金會托管，並已成功孵化。

官方網站

安裝Prometheus

TIPS

簡單期間，本文使用Docker方式安裝，其他方式安裝請詳見 Prometheus安裝說明。

准備配置文件，命名為prometheus.yml

scrape_configs:# 任意寫，建議英文，不要包含特殊字符- job_name: 'spring'  # 多久采集一次數據  scrape_interval: 15s  # 采集時的超時時間  scrape_timeout: 10s  # 采集的路徑是啥  metrics_path: '/actuator/prometheus'  # 采集服務的地址，設置成上面Spring Boot應用所在服務器的具體地址。  static_configs:  - targets: ['30.1.229.89:8080']

這樣配置后，Prometheus服務器就會自動每隔15秒請求 http://30.1.229.89:8080/actuator/prometheus 。更多配置項詳見 Prometheus Configuration官方文檔

在prometheus.yml 文件所在目錄執行如下命令，即可啟動Prometheus

docker run -d -p 9090:9090 \    -v $(pwd)/prometheus.yml:/etc/prometheus/prometheus.yml \    prom/prometheus --config.file=/etc/prometheus/prometheus.yml

測試

訪問http://localhost:9090 ，可看到類似如下的界面
點擊 Insert metric at cursor ，即可選擇監控指標；點擊 Graph ，即可讓指標以圖表方式展示；點擊Execute 按鈕，即可看到類似下圖的結果：

Grafana可視化

至此，已經用Prometheus實現了監控數據的可視化，然而使用體驗並不好。下面來用Grafana實現更友好、更貼近生產的監控可視化。

Grafana是一個開源的跨平台度量分析和可視化 + 告警工具。

官方網站

安裝Grafana

TIPS

簡單期間，本文使用Docker方式安裝，其他方式安裝請詳見 Grafana安裝說明。

啟動

docker run -d -p 3000:3000 grafana/grafana

配置

登錄：訪問 http://localhost:3000/login ，初始賬號/密碼為：admin/admin ，登錄后，即可看到類似如下的界面
點擊Add data source ，即可看到類似如下的界面：
點擊Prometheus，即可看到類似如下界面：
填寫Prometheus的首頁地址，並點擊 Save & Test

創建監控Dashboard

點擊導航欄上的 + 按鈕，並點擊Dashboard，將會看到類似如下的界面：
點擊 Add Query ，即可看到類似如下的界面：

在白框標記的位置輸入指標，指標的取值詳見Spring Boot應用的 /actuator/prometheus 端點，例如jvm_memory_used_bytes 、jvm_threads_states_threads 、jvm_threads_live_threads 等，Grafana會給你較好的提示，並且支持較為復雜的計算，例如聚合、求和、平均等。如果想要繪制多個線條，可點擊Add Query 按鈕，如上圖所示，筆者為圖表繪制了兩條線，分別代表daemon以及peak線程。
點擊下圖的按鈕，並填入Title，即可設置圖表標題。
按下圖步驟操作，即可為Dashboard添加新的圖表。

Dashboard市場

至此，已可用Grafana實現較為豐富的圖表展示——可將關心的監控指標放置到Dashboard上，並且非常靈活！然而，這個配置的操作雖然不難，但還是挺費時間的……

那么是否有配置好的又強大、又通用、拿來即用的Dashboard呢？答案是肯定的！前往 Grafana Lab - Dashboards ，輸入關鍵詞即可搜索指定Dashboard。

Grafana-8

如上圖所示，可以找到若干款以 Prometheus 作為數據源，支持Micrometer的Dashboard！下面，來演示如何使用 JVM(Micrometer) 這個Dashboard。

其他Dashboard使用方式大同小異，建議使用前先點擊了解下詳情，一般Dashboard中都會有說明。

點擊 JVM(Micrometer) 進入Dashboard詳情介紹頁，如下圖所示：

如圖已詳細描述了該Dashboard的特性、配置。其中的management.metrics.tags.application ，前面已經配置過了；本例也不打算演示 Process memory 特性，所以 micrometer-jvm-extras 怎么用也不打算引入了(這是該Dashboard作者為Micrometer提供的增強包，有興趣的童鞋可自行點擊過去研究)。

細心的童鞋會發現，該頁的右上角有個 4701 這是一個非常重要的數字！
訪問http://localhost:3000 ，按下圖步驟操作：
輸入后即可看到類似如下的界面，選擇數據源，並點擊Import。
此時，即可看到類似如下的界面，如圖所示，我們常關心的指標該Dashboard均已支持！

比較好用的Dashboard

JVM (Micrometer)
JVM (Actuator)
Spring Boot Statistics ，注：該Dashboard可能有Bug，筆者未能直接測試成功，做了一些改動后才能正常顯示。

以上三款是筆者親測較為全面、好用的Dashboard，僅供參考。

告警

Grafana支持的告警渠道非常豐富，例如郵件、釘釘、Slack、Webhook等，非常實用！比較簡單，各位看官自行研究下吧。

配套代碼

GitHub
Gitee

其中 prometheus+grafana 目錄已提供Docker一鍵部署Prometheus + Grafana的Shell。

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