12.prometheus监控之Domain域名过期监控

一、域名过期时间监控

域名的监控通过domain_exporter来完成

domain_exporter：https://github.com/caarlos0/domain_exporter/releases

二、domain_exporter安装

2.1 源码安装方法

https://prometheus.io/download/

wget https://github.com/caarlos0/domain_exporter/releases/download/v1.20.0/domain_exporter_1.20.0_linux_amd64.tar.gz

tar zxvf domain_exporter_1.20.0_linux_amd64.tar.gz
mkdir /opt/prometheus -p
mv domain_exporter_1.20.0_linux_amd64 /opt/prometheus/domain_exporter

# 创建用户，并给文件夹授权
useradd -M -s /usr/sbin/nologin prometheus
chown prometheus:prometheus -R /opt/prometheus

#创建systemd服务
cat <<"EOF" >/etc/systemd/system/domain_exporter.service
[Unit]
Description=domain_exporter 
After=network.target

[Service]
Type=simple
User=prometheus
Group=prometheus
ExecStart=/opt/prometheus/domain_exporter/domain_exporter 
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF

# 启动
systemctl daemon-reload
systemctl start domain_exporter
systemctl enable domain_exporter

2.2 docker安装方式

docker run -d --restart=always --name domain_exporter -p 9222:9222 caarlos0/domain_exporter

3.Prometheus设置

cd /data/docker-prometheus
cat >> prometheus/prometheus.yml <<"EOF"
  - job_name: domain
    #scrape_interval: 1h
    scrape_interval: 15s
    metrics_path: /probe
    relabel_configs:
      - source_labels: [__address__]
        target_label: __param_target
      - target_label: __address__
        replacement: 192.168.10.100:9222 # domain_exporter address
    static_configs:
      - targets:
        - qq.com
        - baidu.cn
EOF

# 重新加载配置
curl -X POST http://localhost:9090/-/reload

# 检查
http://192.168.10.100:9222/
http://192.168.10.14:9090/targets?search=

3.1 常用监控项目

domain_expiry_days     域名到期时间
domain_probe_success   域名检测状态

4.domain触发器(告警规则)

cat >> prometheus/rules/domain.yml <<"EOF"
groups:
- name: domain
  rules:
  - alert: 域名检测失败
    expr: domain_probe_success == 0
    for: 2h
    labels:
      severity: warning
    annotations:
      summary: '{{ $labels.instance }}'
      description: '{{ $labels.domain }}域名检测失败'
  - alert: 域名过期
    expr: domain_expiry_days < 30
    for: 2h
    labels:
      severity: warning
    annotations:
      summary: '{{ $labels.instance }}'
      description: '{{ $labels.domain }}将在30天后过期'
  - alert: 域名过期
    expr: domain_expiry_days < 5
    for: 2h
    labels:
      severity: page
    annotations:
      summary: '{{ $labels.instance }}'
      description: '{{ $labels.domain }}将在5天后过期'
EOF

重新加载配置：

curl -X POST http://localhost:9090/-/reload

检查：

http://192.168.10.14:9090/rules

http://192.168.10.14:9090/alerts?search=

4.grafana dashboard图形展示

https://grafana.com/grafana/dashboards/14605

id14605显示域名不正确，需要修改

找到右边的Column Styles，在找到“域名”这列，把instance修改为domain

https://grafana.com/grafana/dashboards/13924-9116-domain/