基本都是要用 SpringBoot2 了啊, 就不要想問 1.x 版了
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <dependency> <groupId>io.micrometer</groupId> <artifactId>micrometer-registry-prometheus</artifactId> </dependency>
actuator 是 SpringBoot 提供管理與監控的基礎套件
micrometer-registry-prometheus 則是將 Spring 的監控資訊轉成 Prometheus 可以吃的格式
management: endpoints: web: exposure: include: '*' endpoint: shutdown: enabled: false
Spring 預設只暴露兩個 監控指標 health 跟 info, 如果沒有太多考量的話可以用 * 來暴露所有的
Done!
Spring 的部分就結束了
你可以實際測試一下監控點
curl -X GET / http://127.0.0.1:8080/actuator/prometheus
得到會是這樣的資料
# HELP jvm_buffer_count An estimate of the number of buffers in the pool # TYPE jvm_buffer_count gauge jvm_buffer_count{id="direct",} 1.0 jvm_buffer_count{id="mapped",} 0.0 # HELP http_server_requests_seconds # TYPE http_server_requests_seconds summary
接下來需要 Prometheus 來把監控數據拉回去儲存
首先你必須準備個 prometheus.yml 配置檔
# my global config global: scrape_interval: 15s # Set the scrape interval to every 15 seconds. Default is every 1 minute. evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute. # scrape_timeout is set to the global default (10s). # A scrape configuration containing exactly one endpoint to scrape: # Here it's Prometheus itself. scrape_configs: - job_name: 'prometheus' static_configs: - targets: ['localhost:9090'] - job_name: 'springboot' metrics_path: '/actuator/prometheus' static_configs: - targets: ['127.0.0.1:8080']
這是最簡單的範例, 也不做 alert 了, 交給 Grafana 處理就好, 很多服務就 job_name 一直往下加就可以了
直接啟動
docker run -p 9090:9090 -v /Users/sam/temp/prometheus.yml:/etc/prometheus/prometheus.yml / prom/prometheus
需要儲存數據 要先把要掛進去的資料夾處理一下
sudo chown -R 65534 /prometheus/data
再啟動
docker run -d -p 9090:9090 / -v /prometheus/prometheus.yml:/etc/prometheus/prometheus.yml / -v /prometheus/data:/prometheus / prom/prometheus --web.enable-lifecycle --config.file=/etc/prometheus/prometheus.yml
http://localhost:9090/graph
Grafana 我就沒有自己建, 要自己建立的話在網路找一下吧
要使用我們剛剛建立的 Prometheus 數據
Configuration -> Add data source
在 https://grafana.com/dashboards 搜尋 spring 或是 jvm
都有人做好現成的, 只要複製 dashboard id
在左邊列表選 Create → Import 輸入你要的 id , 再選一下 Prometheus data source
立馬完成一個功能齊全的監控中心啊
https://i.imgur.com/TETvXdo.png