Docker Prometheus配置

Question

我正在尝试配置prometheus和grafana来监控我的django应用程序，但是当执行docker-compose up命令时抛出这个错误：

grafana_prometheus_ctnr | level=error ts=2020-10-20T13:08:42.474Z caller=main.go:290 msg="Error loading config (--config.file=/etc/prometheus/prometheus.yml)" err="open /etc/prometheus/prometheus.yml: no such file or directory"

我有各种各样的服务，其中之一是普罗米修斯。

docker-compose.yml：

...

prometheus:
  container_name: grafana_prometheus_ctnr
  build:
    context: .
    dockerfile: Dockerfile-prometheus
  volumes:
    - ./prometheus-data:/etc/prometheus
  ports:
    - 9090:9090
  networks:
    - grafana-ntwk

...

Dockerfile-prometheus：

FROM prom/prometheus:v2.22.0

LABEL version="1.0.0"

COPY ./prometheus.yml /etc/prometheus/
COPY ./prometheus.json /etc/prometheus/file_sd/

EXPOSE 9090

prometheus.yml：

global:
  scrape_interval: 15s
  evaluation_interval: 15s
  scrape_timeout: 10s

scrape_configs:
  - file_sd_configs:
    files:
      - /etc/prometheus/file_sd/*.json

prometheus.json：

[
  {
    "targets": ["0.0.0.0:9090"],
    "labels": {
      "job": "prometheus",
      "environment": "develope",
    }
  },
  {
    "targets": ["0.0.0.0:8000"],
    "labels": {
      "job": "django",
      "environment": "develope",
    }
  },
  {
    "targets": ["0.0.0.0:5432"],
    "labels": {
      "job": "postres",
      "environment": "develope",
    }
  }
]

有人知道为什么文件没有被复制吗？

Answer 1

这个更新对我来说效果很好：

Dockerfile-prometheus：

...
COPY ./prometheus.yml /etc/prometheus/prometheus.yml
COPY ./prometheus.json /etc/prometheus/file_sd/prometheus.json
...

docker-compose.yml：

...
prometheus:
  container_name: grafana_prometheus_ctnr
  build:
    context: .
    dockerfile: Dockerfile-prometheus
  volumes:
    - ./prometheus-data:/etc/prometheus
  ports:
    - 9090:9090
  networks:
    - grafana-ntwk
...

prometheus.yml：

global:
  scrape_interval: 15s
  evaluation_interval: 15s
  scrape_timeout: 10s

scrape_configs:
  - job_name: 'monitoring'
    file_sd_configs:
      - files:
        - /etc/prometheus/file_sd/*.json

Answer 2

问题出在您的Dockerfile和docker-compose文件中。Dockerfile将prometheus.yml复制到/etc/prometheus目录。docker-compose还将卷挂载到同一目录中。在这种情况下，容器内目录中的现有文件会被屏蔽，因为docker会将它们挂载在现有文件之上。文件仍然在容器中，但它们是不可访问的。从docker文件中删除COPY，或者从docker-compose中删除卷，或者将它们挂载到另一个目录中。