在k8s集群中，利用prometheus的jmx_exporter进行tomcat的JVM性能监控，并用grafana作前端展示

查找了很多文档，没有完全达到我要求的，

于是，作了一定的调整，成现在这样。

操作步骤如下：

一，准备好两个文件。

jmx_prometheus_javaagent-0.3.1.jar

jmx_exporter.yml

jmx_exporter.yml作最简单配置如下：

---
rules:
- pattern: ".*"

二，tomcat的启动项，一直在bin下单独的setenv.sh里操作，新增如下启动选项，将jar包及yaml加入启动选项。

JAVA_OPTS="$JAVA_OPTS -javaagent:/xxx/bin/jmx_prometheus_javaagent-0.3.1.jar=1234:/xxx/bin/jmx_exporter.yml"

三，制作dockerfile时，要将这两个东东也CP到上面指定目录，并EXPOSE一个新的端口。

...
COPY --chown=a:a tomcat /xxx/tomcat
COPY --chown=a:a jdk /xxx/jdk
COPY --chown=a:a jmx_prometheus_javaagent-0.3.1.jar /xxx/tomcat/bin/
COPY --chown=a:a jmx_exporter.yml /xxx/tomcat/bin/

WORKDIR ${CATALINA_HOME}

USER a
EXPOSE 8080 1234

四，更新prometheus的配置文件configmap，新增一个job。

- job_name: 'tomcat-pods'
        tls_config:
          ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
        bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
        kubernetes_sd_configs:
        - role: endpoints
        relabel_configs:
        - source_labels: [__meta_kubernetes_service_annotation_prometheus_io_scrape, __meta_kubernetes_service_annotation_prometheus_io_jvm_scrape]
          regex: true;true
          action: keep
        - source_labels: [__meta_kubernetes_service_annotation_prometheus_io_app_metrics_patn]
          action: replace
          target_label: __metrics_path__
          regex: (.+)
        - source_labels: [__meta_kubernetes_pod_ip, __meta_kubernetes_service_annotation_prometheus_io_app_metrics_port]
          action: replace
          target_label: __address__
          regex: (.+);(.+)

        - source_labels: [__meta_kubernetes_namespace]
          action: replace
          target_label: kubernetes_namespace
        - source_labels: [__meta_kubernetes_pod_name]
          action: replace
          target_label: kubernetes_pod_name

五，在对应的需要监控JVM的应用时，新增一个SERVICE。

apiVersion: v1
kind: Service
metadata:
  labels:
    name: xxx
  name: xxx
  namespace: default
  annotations:
        prometheus.io/scrape: "true"
        prometheus.io/jvm-scrape: "true"
        prometheus.io/jvm-port: "1234"
        prometheus.io/jvm-path: "/metrics"
spec:
  ports:
  - port: 1234
    targetPort: 1234
  selector:
    name: xxx

六，最后，导入grafana的插件文件。

{
"__inputs": [
    {
      "name": "DS_PROM",
      "label": "prom",
      "description": "A prometheus datasource with JMX Exporter scraping",
      "type": "datasource",
      "pluginId": "prometheus",
      "pluginName": "Prometheus"
    }
  ],
  "__requires": [
    {
      "type": "grafana",
      "id": "grafana",
      "name": "Grafana",
      "version": "4.5.0-pre1"
    },
    {
      "type": "panel",
      "id": "graph",
      "name": "Graph",
      "version": ""
    },
    {
      "type": "datasource",
      "id": "prometheus",
      "name": "Prometheus",
      "version": "1.0.0"
    }
  ],
  "annotations": {
    "list": []
  },
  "description": " tomcat JVM Dashboard for JVM metrics with Prometheus / JMX Exporter",
  "editable": true,
  "gnetId": 3066,
  "graphTooltip": 0,
  "id": 10,
  "iteration": 1544507474291,
  "links": [],
  "panels": [
    {
      "aliasColors": {},
      "bars": false,
      "dashLength": 10,
      "dashes": false,
      "datasource": "${DS_PROM}",
      "fill": 1,
      "gridPos": {
        "h": 7,
        "w": 24,
        "x": 0,
        "y": 0
      },
      "id": 2,
      "legend": {
        "alignAsTable": true,
        "avg": true,
        "current": true,
        "max": true,
        "min": true,
        "rightSide": true,
        "show": true,
        "total": false,
        "values": true
      },
      "lines": true,
      "linewidth": 1,
      "links": [],
      "nullPointMode": "null",
      "percentage": false,
      "pointradius": 5,
      "points": false,
      "renderer": "flot",
      "repeat": null,
      "seriesOverrides": [],
      "spaceLength": 10,
      "stack": false,
      "steppedLine": false,
      "targets": [
        {
          "expr": "jvm_memory_bytes_used{kubernetes_pod_name=~\"$kubernetes_pod_name\"}",
          "format": "time_series",
          "interval": "",
          "intervalFactor": 5,
          "legendFormat": "{{area}} memory [{{instance}}]",
          "metric": "jvm_memory_bytes_used",
          "refId": "A",
          "step": 5
        }
      ],
      "thresholds": [],
      "timeFrom": null,
      "timeShift": null,
      "title": "Memory used",
      "tooltip": {
        "shared": true,
        "sort": 0,
        "value_type": "individual"
      },
      "type": "graph",
      "xaxis": {
        "buckets": null,
        "mode": "time",
        "name": null,
        "show": true,
        "values": []
      },
      "yaxes": [
        {
          "format": "bytes",
          "label": null,
          "logBase": 1,
          "max": null,
          "min": null,
          "show": true
        },
        {
          "format": "short",
          "label": null,
          "logBase": 1,
          "max": null,
          "min": null,
          "show": true
        }
      ],
      "yaxis": {
        "align": false,
        "alignLevel": null
      }
    },
    {
      "aliasColors": {},
      "bars": false,
      "dashLength": 10,
      "dashes": false,
      "datasource": "${DS_PROM}",
      "fill": 1,
      "gridPos": {
        "h": 7,
        "w": 12,
        "x": 0,
        "y": 7
      },
      "id": 3,
      "legend": {
        "avg": false,
        "current": false,
        "max": false,
        "min": false,
        "show": true,
        "total": false,
        "values": false
      },
      "lines": true,
      "linewidth": 1,
      "links": [],
      "nullPointMode": "null",
      "percentage": false,
      "pointradius": 5,
      "points": false,
      "renderer": "flot",
      "seriesOverrides": [],
      "spaceLength": 10,
      "stack": false,
      "steppedLine": false,
      "targets": [
        {
          "expr": "jvm_threads_current{kubernetes_pod_name=~\"$kubernetes_pod_name\"}",
          "format": "time_series",
          "intervalFactor": 5,
          "legendFormat": "current [{{instance}}]",
          "metric": "jvm_threads_current",
          "refId": "A",
          "step": 10
        },
        {
          "expr": "jvm_threads_daemon{kubernetes_pod_name=~\"$kubernetes_pod_name\"}",
          "format": "time_series",
          "intervalFactor": 5,
          "legendFormat": "daemon [{{instance}}]",
          "metric": "jvm_threads_daemon",
          "refId": "B",
          "step": 10
        }
      ],
      "thresholds": [],
      "timeFrom": null,
      "timeShift": null,
      "title": "Threads used",
      "tooltip": {
        "shared": true,
        "sort": 0,
        "value_type": "individual"
      },
      "type": "graph",
      "xaxis": {
        "buckets": null,
        "mode": "time",
        "name": null,
        "show": true,
        "values": []
      },
      "yaxes": [
        {
          "decimals": 0,
          "format": "short",
          "label": null,
          "logBase": 1,
          "max": null,
          "min": null,
          "show": true
        },
        {
          "format": "short",
          "label": null,
          "logBase": 1,
          "max": null,
          "min": null,
          "show": true
        }
      ],
      "yaxis": {
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        "alignLevel": null
      }
    },
    {
      "aliasColors": {},
      "bars": false,
      "dashLength": 10,
      "dashes": false,
      "datasource": "${DS_PROM}",
      "fill": 1,
      "gridPos": {
        "h": 7,
        "w": 12,
        "x": 12,
        "y": 7
      },
      "id": 4,
      "legend": {
        "avg": false,
        "current": false,
        "max": false,
        "min": false,
        "show": true,
        "total": false,
        "values": false
      },
      "lines": true,
      "linewidth": 1,
      "links": [],
      "nullPointMode": "null",
      "percentage": false,
      "pointradius": 5,
      "points": false,
      "renderer": "flot",
      "seriesOverrides": [],
      "spaceLength": 10,
      "stack": false,
      "steppedLine": false,
      "targets": [
        {
          "expr": "jvm_classes_loaded{kubernetes_pod_name=~\"$kubernetes_pod_name\"}",
          "format": "time_series",
          "interval": "",
          "intervalFactor": 5,
          "legendFormat": "loaded [{{instance}}]",
          "metric": "jvm_classes_loaded",
          "refId": "A",
          "step": 10
        }
      ],
      "thresholds": [],
      "timeFrom": null,
      "timeShift": null,
      "title": "Class loading",
      "tooltip": {
        "shared": true,
        "sort": 0,
        "value_type": "individual"
      },
      "type": "graph",
      "xaxis": {
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          "label": "",
          "logBase": 1,
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          "show": true
        },
        {
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          "label": null,
          "logBase": 1,
          "max": null,
          "min": null,
          "show": true
        }
      ],
      "yaxis": {
        "align": false,
        "alignLevel": null
      }
    },
    {
      "aliasColors": {},
      "bars": false,
      "dashLength": 10,
      "dashes": false,
      "datasource": "${DS_PROM}",
      "fill": 1,
      "gridPos": {
        "h": 7,
        "w": 12,
        "x": 0,
        "y": 14
      },
      "id": 5,
      "legend": {
        "avg": false,
        "current": false,
        "max": false,
        "min": false,
        "show": true,
        "total": false,
        "values": false
      },
      "lines": true,
      "linewidth": 1,
      "links": [],
      "nullPointMode": "null",
      "percentage": false,
      "pointradius": 5,
      "points": false,
      "renderer": "flot",
      "seriesOverrides": [],
      "spaceLength": 10,
      "stack": false,
      "steppedLine": false,
      "targets": [
        {
          "expr": "rate(jvm_gc_collection_seconds_sum{kubernetes_pod_name=~\"$kubernetes_pod_name\"}[1m])",
          "format": "time_series",
          "interval": "",
          "intervalFactor": 5,
          "legendFormat": "{{gc}} [{{instance}}]",
          "metric": "jvm_gc_collection_seconds_sum",
          "refId": "A",
          "step": 10
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      ],
      "thresholds": [],
      "timeFrom": null,
      "timeShift": null,
      "title": "GC time / 1 min. rate",
      "tooltip": {
        "shared": true,
        "sort": 0,
        "value_type": "individual"
      },
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      "xaxis": {
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      },
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          "logBase": 1,
          "max": null,
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          "show": true
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          "label": null,
          "logBase": 1,
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          "show": true
        }
      ],
      "yaxis": {
        "align": false,
        "alignLevel": null
      }
    },
    {
      "aliasColors": {},
      "bars": false,
      "dashLength": 10,
      "dashes": false,
      "datasource": "${DS_PROM}",
      "fill": 1,
      "gridPos": {
        "h": 7,
        "w": 12,
        "x": 12,
        "y": 14
      },
      "id": 6,
      "legend": {
        "avg": false,
        "current": false,
        "max": false,
        "min": false,
        "show": true,
        "total": false,
        "values": false
      },
      "lines": true,
      "linewidth": 1,
      "links": [],
      "nullPointMode": "null",
      "percentage": false,
      "pointradius": 5,
      "points": false,
      "renderer": "flot",
      "seriesOverrides": [],
      "spaceLength": 10,
      "stack": false,
      "steppedLine": false,
      "targets": [
        {
          "expr": "jvm_gc_collection_seconds_count{kubernetes_pod_name=~\"$kubernetes_pod_name\"}",
          "format": "time_series",
          "interval": "",
          "intervalFactor": 5,
          "legendFormat": "{{gc}} [{{instance}}]",
          "metric": "",
          "refId": "A",
          "step": 10
        }
      ],
      "thresholds": [],
      "timeFrom": null,
      "timeShift": null,
      "title": "GC count",
      "tooltip": {
        "shared": true,
        "sort": 0,
        "value_type": "individual"
      },
      "type": "graph",
      "xaxis": {
        "buckets": null,
        "mode": "time",
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        "show": true,
        "values": []
      },
      "yaxes": [
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        },
        {
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          "logBase": 1,
          "max": null,
          "min": null,
          "show": true
        }
      ],
      "yaxis": {
        "align": false,
        "alignLevel": null
      }
    }
  ],
  "refresh": "30s",
  "schemaVersion": 16,
  "style": "dark",
  "tags": [
    "JVM",
    "prometheus",
    "jmx_exporter"
  ],
  "templating": {
    "list": [
      {
        "allValue": "",
        "current": {
          "tags": [],
          "text": "All",
          "value": [
            "$__all"
          ]
        },
        "datasource": "${DS_PROM}",
        "hide": 0,
        "includeAll": true,
        "label": "kubernetes_pod_name",
        "multi": true,
        "name": "kubernetes_pod_name",
        "options": [],
        "query": "label_values(jvm_memory_bytes_max,kubernetes_pod_name)",
        "refresh": 1,
        "regex": "",
        "skipUrlSync": false,
        "sort": 0,
        "tagValuesQuery": "",
        "tags": [],
        "tagsQuery": "",
        "type": "query",
        "useTags": false
      }
    ]
  },
  "time": {
    "from": "now-30m",
    "to": "now"
  },
  "timepicker": {
    "refresh_intervals": [
      "5s",
      "10s",
      "30s",
      "1m",
      "5m",
      "15m",
      "30m",
      "1h",
      "2h",
      "1d"
    ],
    "time_options": [
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      "15m",
      "1h",
      "6h",
      "12h",
      "24h",
      "2d",
      "7d",
      "30d"
    ]
  },
  "timezone": "",
  "title": " tomcat JVM overview - Prometheus",
  "uid": "PVQFY0Pmz",
  "version": 2
}