Prometheus 指标终点是运行但目标状态为 down

Question

我在 http://localhost:9615/metrics 上有 Prometheus Polkadot 指标端点运行我在配置中定义了 prometheus.yml

global:
  scrape_interval: 15s
  evaluation_interval: 15s

rule_files:
  # - "first.rules"
  # - "second.rules"

scrape_configs:
  - job_name: "prometheus"
    scrape_interval: 5s
    static_configs:
      - targets: ["localhost:9090"]
  - job_name: "substrate_node"
    scrape_interval: 5s
    static_configs:
      - targets: ["localhost:9615"]

我在目标中遇到以下错误

Get "http://localhost:9615/metrics": dial tcp 127.0.0.1:9615: connect: connection refused

我的 Prometheus 运行在 docker 容器中

docker run -d --name prometheus -p 9090:9090 -v prometheus.yml:/etc/prometheus/prometheus.yml prom/prometheus --config.file=/etc/prometheus/prometheus.yml

如何解决该错误？

Answer 1

为了在两个容器之间进行通信，您需要将它们置于同一个 Docker 桥接网络中。否则，一个容器的 localhost 版本与另一个完全隔离。

要解决此问题，请尝试运行将两个容器放在同一个 docker-compose.yaml 中，使用容器名称而不是 localhost。

By default Compose sets up a single network for your app. Each container for a service joins the default network and is both reachable by other containers on that network, and discoverable by them at a hostname identical to the container name.

version: '2'

services:
  polkadot:
    container_name: polkadot
    image: parity/polkadot
    ports:
      - 30333:30333 # p2p port
      - 9933:9933 # rpc port
      - 9944:9944 # ws port
      - 9615:9615
    command: [
      "--name", "PolkaDocker",
      "--ws-external",
      "--rpc-external",
      "--rpc-cors", "all",
      "--prometheus-external"
    ]

  prometheus:
    container_name: prometheus
    image: prom/prometheus
    ports:
      - 9090:9090
    volumes:
      - ./prometheus.yml:/etc/prometheus/prometheus.yml
    command: [
      "--config.file=/etc/prometheus/prometheus.yml"
    ]

同样，您需要像这样更新您在 prometheus 配置中访问的主机：

global:
  scrape_interval: 15s
  evaluation_interval: 15s

rule_files:
  # - "first.rules"
  # - "second.rules"

scrape_configs:
  - job_name: "prometheus"
    scrape_interval: 5s
    static_configs:
      - targets: ["prometheus:9090"] # NOTE HOW ITS NOT LOCALHOST HERE
  - job_name: "substrate_node"
    scrape_interval: 5s
    static_configs:
      - targets: ["polkadot:9615"] # NOTE HOW ITS NOT LOCALHOST HERE

您可以在他们的文档 here 中找到有关 Docker 网络复杂性的大量资源。但是上面的配置应该让你起来运行因为这两个目标都是在我这边的 Prometheus 中出现的。

Prometheus 指标终点是 运行 但目标状态为 down

Prometheus metrics end point is running but the target status is down

prometheus

Prometheus 指标终点是运行但目标状态为 down