使用 Prometheus+cAdvisor 监控 Docker 容器指标-EW帮帮网

一、序言

本篇介绍如何使用Prometheus+cAdvisor来监控容器，操作指南来自官网手册：https://prometheus.io/docs/guides/cadvisor/

Prometheus是什么已经知道了，先介绍一下cAdvisor：

cAdvisor（Container Advisor ）是谷歌开发的监控容器并提供容器监控指标导出的软件，监控指标可以被Prometheus使用。

cAdvisor官网地址：https://github.com/google/cadvisor
我也写了一篇关于cAdvisor的安装：https://blog.csdn.net/qq_50247813/article/details/150075606?spm=1001.2014.3001.5501

二、开始部署

本篇笔记参考官网手册，使用docker-compose部署

1. 编写docker-compose

version: '3.2'
services:
  prometheus:
    image: prom/prometheus:latest
    container_name: prometheus
    ports:
    - 9090:9090
    command:
    - --config.file=/etc/prometheus/prometheus.yml
    volumes:
    - ./prometheus.yml:/etc/prometheus/prometheus.yml:ro
    depends_on:
    - cadvisor
  cadvisor:
    image: gcr.nju.edu.cn/cadvisor/cadvisor:latest
    container_name: cadvisor
    ports:
    - 8080:8080
    volumes:
    - /:/rootfs:ro
    - /var/run:/var/run:rw
    - /sys:/sys:ro
    - /var/lib/docker/:/var/lib/docker:ro
    depends_on:
    - redis
  redis:
    image: redis:latest
    container_name: redis
    ports:
    - 6379:6379

在上面的yml文件中需要注意：
```
  volumes:
      - ./prometheus.yml:/etc/prometheus/prometheus.yml:ro
```
prometheus容器将当前目录下的prometheus.yml映射到了容器里面，所以需要保证当前目录下有这个文件。
由于默认的gcr.io/cadvisor/cadvisor:latest 镜像在国内无法访问所以这里替换成南京源，需要配置docker镜像加速：
```
  "registry-mirrors": [
      "https://docker.nju.edu.cn"
  ]
```

2. 配置Prometheus

在监控作业中添加一个cadvisor，targets目标为cadvisor:8080

scrape_configs:
- job_name: cadvisor
  scrape_interval: 5s
  static_configs:
  - targets:
    - cadvisor:8080

查看当前目录文件：

 ls -1

docker-compose.yml
prometheus.yml

3. 运行docker-compose

docker-compose up -d
docker-compose ps

NAME         IMAGE                                     COMMAND                  SERVICE      CREATED          STATUS                        PORTS
cadvisor     gcr.nju.edu.cn/cadvisor/cadvisor:latest   "/usr/bin/cadvisor -…"   cadvisor     11 minutes ago   Up About a minute (healthy)   0.0.0.0:8080->8080/tcp, :::8080->8080/tcp
prometheus   prom/prometheus:latest                    "/bin/prometheus --c…"   prometheus   11 minutes ago   Up About a minute             0.0.0.0:9090->9090/tcp, :::9090->9090/tcp
redis        redis:latest                              "docker-entrypoint.s…"   redis        11 minutes ago   Up About a minute             0.0.0.0:6379->6379/tcp, :::6379->6379/tcp