Linux服务器配置Prometheus监控全攻略

一、Prometheus核心组件介绍

在开始配置之前，我们需要了解Prometheus的几个关键组件：

• Prometheus Server：核心服务，负责数据采集和存储
• Exporters：数据采集代理，如node_exporter用于主机监控
• Alertmanager：告警管理组件
• Pushgateway：支持短生命周期任务的监控

二、安装Prometheus Server

# 下载最新版Prometheus
wget https://github.com/prometheus/prometheus/releases/download/v2.30.3/prometheus-2.30.3.linux-amd64.tar.gz

# 解压安装包
tar xvfz prometheus-*.tar.gz
cd prometheus-*

# 创建系统用户
sudo useradd --no-create-home --shell /bin/false prometheus

# 复制二进制文件
sudo cp prometheus promtool /usr/local/bin/
sudo chown prometheus:prometheus /usr/local/bin/prometheus
sudo chown prometheus:prometheus /usr/local/bin/promtool

# 创建配置文件目录
sudo mkdir /etc/prometheus
sudo mkdir /var/lib/prometheus

三、配置Prometheus

编辑配置文件/etc/prometheus/prometheus.yml：

global:
  scrape_interval: 15s
  evaluation_interval: 15s

scrape_configs:
  - job_name: 'prometheus'
    static_configs:
    - targets: ['localhost:9090']

四、安装Node Exporter

Node Exporter用于采集主机监控指标：

wget https://github.com/prometheus/node_exporter/releases/download/v1.2.2/node_exporter-1.2.2.linux-amd64.tar.gz
tar xvfz node_exporter-*.tar.gz
cd node_exporter-*
sudo cp node_exporter /usr/local/bin/

五、创建Systemd服务

为Prometheus和Node Exporter创建服务：

# Prometheus服务
[Unit]
Description=Prometheus
Wants=network-online.target
After=network-online.target

[Service]
User=prometheus
Group=prometheus
ExecStart=/usr/local/bin/prometheus \
    --config.file /etc/prometheus/prometheus.yml \
    --storage.tsdb.path /var/lib/prometheus/ \
    --web.console.templates=/etc/prometheus/consoles \
    --web.console.libraries=/etc/prometheus/console_libraries

[Install]
WantedBy=multi-user.target

六、配置告警规则

创建告警规则文件/etc/prometheus/rules.yml：

groups:
- name: example
  rules:
  - alert: HighCPUUsage
    expr: 100 - (avg by(instance)(irate(node_cpu_seconds_total{mode="idle"}[5m])) * 100) > 80
    for: 5m
    labels:
      severity: warning
    annotations:
      summary: "High CPU usage on {{ $labels.instance }}"

七、可视化监控数据

推荐使用Grafana进行数据可视化：

sudo apt-get install -y adduser libfontconfig1
wget https://dl.grafana.com/oss/release/grafana_8.1.5_amd64.deb
sudo dpkg -i grafana_8.1.5_amd64.deb

八、最佳实践建议

• 定期备份Prometheus数据
• 合理设置数据保留时间
• 使用Relabeling优化指标
• 考虑使用Recording Rules优化查询性能