监控cpu,内存告警
最后更新于：2022-04-02 03:00:37
[TOC]
> [参考](https://yunlzheng.gitbook.io/prometheus-book/parti-prometheus-ji-chu/alert/prometheus-alert-rule)
## 修改 prometheus.yml
```
rule_files:
- rules/*.rules
```
## 配置 rules/hoststats-alert.rules
```
groups:
- name: hostStatsAlert
rules:
- alert: hostCpuUsageAlert
expr: sum(avg without (cpu)(irate(node_cpu_seconds_total{mode!='idle'}[5m]))) by (instance) > 0.85
for: 1m
labels:
severity: page
annotations:
summary: "Instance {{ $labels.instance }} CPU usgae high"
description: "{{ $labels.instance }} CPU usage above 85% (current value: {{ $value }})"
- alert: hostMemUsageAlert
expr: (node_memory_MemTotal_bytes - node_memory_MemAvailable_bytes)/node_memory_MemTotal_bytes > 0.85
for: 1m
labels:
severity: page
annotations:
summary: "Instance {{ $labels.instance }} MEM usgae high"
description: "{{ $labels.instance }} MEM usage above 85% (current value: {{ $value }})"
```
## 启动 AlertMannager
```
./alertmanager
```
## 测试
用此命令升高cpu,使其报警
```
cat /dev/zero>/dev/null
```
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