Prometheus监控elasticsearch集群（以elasticsearch-6.4.2版本为例）

部署elasticsearch集群,配置文件可“浓缩”为以下：

cluster.name: es_cluster
node.name: node1
path.data: /app/data/elasticsearch
path.logs: /app/logs/elasticsearch
network.host: 192.168.x.x
http.port: 9200
transport.tcp.port: 9201
discovery.zen.ping.unicast.hosts: ["node1", "node2","node3"]
discovery.zen.minimum_master_nodes: 2
gateway.recover_after_nodes: 3
gateway.expected_nodes: 3
gateway.recover_after_time: 5m
http.cors.enabled: true
http.cors.allow-origin: "*"
thread_pool.bulk.queue_size: 500
xpack.security.enabled: false

下载插件进行并进行安装

插件下载地址： https://github.com/vvanholl/elasticsearch-prometheus-exporter/releases

安装: 如果有elk单独用户,切换到该用户下, wget下载，进入到es安装目录,执行 ./elasticsearch-plugin install file://$(pwd)/../../elasticsearch-prometheus-exporter-6.4.2.0.zip 即可完成安装

配置Prometheus, 添加如下配置，并重新启动Prometheus

- job_name: 'elasticsearch'
    scrape_interval: 30s
    metrics_path: "/_prometheus/metrics"
    static_configs:
    - targets:
      - 192.168.x.x:9200
      - 192.168.x.x:9200
      - 192.168.x.x:9200

配置Grafana, 导入模板，编号建议为 266 (https://grafana.com/dashboards/266) 选择数据源为 Prometheus , 添加即可，会出现如下的监控图