Prometheus+Alertmanager实现邮件报警

Prometheus+grafana的安装可以参考文章：https://blog.csdn.net/anqixiang/article/details/104283549

一、原理图

二、部署Alertmanager

wget https://github.com/prometheus/alertmanager/releases/download/v0.20.0/alertmanager-0.20.0.linux-amd64.tar.gz
tar xvf alertmanager-0.20.0.linux-amd64.tar.gz
mv alertmanager-0.20.0.linux-amd64 /usr/local/bin/alertmanager

三、修改alertmanager的主配置文件【采用邮件告警】

cd /usr/local/bin/alertmanager
cat > alertmanager.yml << EOF
global:
  resolve_timeout: 5m
  smtp_smarthost: 'smtp.163.com:25'
  smtp_from: 发件人邮箱
  smtp_auth_username: 发件人邮箱
  smtp_auth_password: 密码
  smtp_require_tls: false

route:
  group_by: ['alertname']
  group_wait: 10s
  group_interval: 10s
  repeat_interval: 1m
  receiver: 'mail'
receivers:
- name: 'mail'
  email_configs:
  - to: 收件人邮箱
EOF

检查配置文件是否正确

./amtool check-config alertmanager.yml

启动

./alertmanager --config.file=alertmanager.yml &

四、配置Prometheus与Alertmanager通信

vim prometheus.yml

mkdir rules
./promtool check config prometheus.yml

五、编写告警规则

官方示例：https://prometheus.io/docs/prometheus/latest/configuration/alerting_rules/

cat > rules/test.yml << EOF
groups:
- name: general.rules
  rules:

  # Alert for any instance that is unreachable for >5 minutes.
  - alert: InstanceDown
    expr: up == 0
    for: 1m
    labels:
      severity: error
    annotations:
      summary: "Instance {{ $labels.instance }} 停止工作"
      description: "{{ $labels.instance }} of job {{ $labels.job }} 已停止1分钟>以上"
EOF
./promtool check config prometheus.yml
systemctl restart prometheus

能看到自己编写的规则

六、验证告警

在172.16.38.238上停止node这个job
可以看到node已经down掉

等待两分钟左右可以收到告警邮件

状态变为FIRING

七、告警状态解释