解压到opt目录，改拥有者

chown prometheus.prometheus -R alertmanager/

创建systemd服务

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cat > /etc/systemd/system/alertmanager.service << "EOF"
[Unit]
Description=Alert Manager
Wants=network-online.target
After=network-online.target

[Service]
Type=simple
User=prometheus
Group=prometheus
Restart=always
ExecStart=/opt/prj/alertmanager/alertmanager \
  --config.file=/opt/prj/alertmanager/alertmanager.yml \
  --storage.path=/opt/prj/alertmanager/data 

[Install]
WantedBy=multi-user.target
EOF

root@u22:/opt# systemctl daemon-reload
root@u22:/opt# systemctl start alertmanager
root@u22:/opt# systemctl status alertmanager

验证

http://192.168.66.103:9093/

修改prometheus.yml，把altermanager加入

alerting:
alertmanagers:
- static_configs:
- targets:
- localhost:9093

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cat > /opt/prometheus/alert.yml << "EOF"
groups:
- name: Promtheus alert
  rules:
  - alert: 服务告警
    expr: up == 0
    for: 30s
    labels:
      severity: critical
    annotations:
      instance: "{{$labels.instance}}"
      description: "{{$labels.job}}服务已关闭"
EOF

检查配置文件

cd /opt/prometheus

./promtool check config prometheus.yml

重启prometheus或重新加载配置文件（二选一）

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