## **安装AlertManager** github上给了AlertManager的几种安装方法：`https://github.com/prometheus/alertmanager`。​ 这里，我们使用二进制进行安装。首先下载二进制文件，这里我们下载最新版本0.20.0（`https://prometheus.io/download/#alertmanager`）​ ``` $ wget https://github.com/prometheus/alertmanager/releases/download/v0.20.0/alertmanager-0.20.0.linux-amd64.tar.gz ``` 同样，我们使用systemd来管理这个服务。我们把解压后的整个`alertmanager-0.20.0.linux-amd64`文件夹移动到`/usr/local/`目录下，并重命名为`alertmanager` ``` $ mv ./alertmanager-0.20.0.linux-amd64 /usr/local/alertmanager ``` 然后创建文件/usr/lib/systemd/system/alertmanager.service，内容如下 ``` [Unit] Description=alertmanager After=network.target ​ [Service] Type=simple ExecStart=/usr/local/alertmanager/alertmanager --config.file /usr/local/alertmanager/alertmanager.yml --storage.path=/var/lib/alertmanager Restart=on-failure ​ [Install] WantedBy=multi-user.target ``` 编辑`/usr/local/alertmanager/alertmanager.yml`，内容如下（参考Reference） ``` global: smtp_smarthost: 'smtp.163.com:25' # 使用163邮箱服务器发邮件 smtp_from: 'pshizh@163.com' # 发件人，填写你的163邮箱 smtp_auth_username: 'pshizh@163.com' # 你的163邮箱，与上面保持一致 smtp_auth_password: 'xxxx' # 你的163邮箱的密码 ​ route: group_by: ['example'] group_wait: 10s group_interval: 10s repeat_interval: 1h receiver: 'email' ​ receivers: - name: 'email' email_configs: - to: '527103524@qq.com' # 收件人 ``` 启动alertmanager ``` $ systemctl daemon-reload && systemctl enable alertmanager $ systemctl start alertmanager && systemctl status alertmanager ``` ## **为Prometheus配置AlertManager与告警规则** 编辑`/usr/local/prometheus/prometheus.yml`文件，在`alerting`区域与`rule_files`区域添加如下的内容，最终prometheus.yml文件内容如下： ``` # my global config global: scrape_interval: 15s # Set the scrape interval to every 15 seconds. Default is every 1 minute. evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute. ​ # Alertmanager configuration alerting: alertmanagers: - static_configs: - targets: [ 'localhost:9093' ] ​ rule_files: - "/usr/local/prometheus/rule_files/memory_alert.yml" ​ scrape_configs: - job_name: 'prometheus' static_configs: - targets: ['localhost:9090'] - job_name: 'node_exporter' static_configs: - targets: ['localhost:9100'] ``` 然后创建文件`/usr/local/prometheus/rule_files/memory_alert.yml`，内容如下： ``` groups: - name: example # 尚不清楚是否需要与alertmanager.yml中的route.groupby的名字保持一致 rules: - alert: NodeMemoryUsage expr: (node_memory_MemTotal_bytes - node_memory_MemAvailable_bytes) / node_memory_MemTotal_bytes * 100 > 20 for: 1m annotations: summary: "{{$labels.instance}}: High Memory usage detected" description: "{{$labels.instance}}: Memory usage is above 20% (current value is:{{ $value }})" ``` 不久后，便可以接收到告警邮件，如下  ## **Reference** [1] https://www.cnblogs.com/longcnblogs/p/9620733.html [2] https://github.com/prometheus/alertmanager/blob/master/doc/examples/simple.yml