使用alertmanager对监控对象进行报警（邮件）二
安装alertmanager
到https://prometheus.io/download/下载alertmanager
解压后编辑alertmanager.yml，只实现报警功能，修改如下
global:resolve_timeout: 5m smtp_smarthost: 'smtp.163.com:25'smtp_from: '***@163.com'smtp_auth_username: '***@163.com'smtp_auth_password: '******' #授权密码smtp_require_tls: false route:group_by: ['alertname']group_wait: 10sgroup_interval: 10srepeat_interval: 1m #重复间隔，这里设置为1m，生产环境设置为20m-30m左右receiver: 'mail' receivers: - name: 'mail'email_configs:- to: '@@@@@@163.com'
启动
nohup ./alertmanager --config.file=/root/alertmanager-0.17.0.linux-amd64/alertmanager.yml &
修改prometheus配置如下（和alertmanager同主机）：
alerting:alertmanagers:- static_configs:- targets:- 127.0.0.1:9093 #本机启动Alertmanager因此使用127.0.0.1，也可部署在其他主机 rule_files:- "rules/*.yml" #设置报警规则文件
添加node普遍报警法规则内容如下：
groups:
- name: general.rulesrules:# Alert for any ×××tance that is unreachable for >5 minutes.- alert: InstanceDownexpr: up == 0for: 1mlabels:severity: errorannotations:summary: "Instance {{ $labels.×××tance }} down"description: "{{ $labels.×××tance }} of job {{ $labels.job }} has been down for more than 5 minutes." 查看prometheus中，Targets状态，此时node http://192.168.199.221:9100/metrics是up状态
将221的node_exporter停掉，再次观察
查看Alerts状态
稍等片刻收到报警
添加内存的报警规则内容如下：
groups:
- name: mem.rulesrules:# Alert for any ×××tance that is unreachable for >5 minutes.- alert: NodeMemoryUsageexpr: (node_memory_MemTotal_bytes - (node_memory_MemFree_bytes+node_memory_Buffers_bytes+node_memory_Cached_bytes )) / node_memory_MemTotal_bytes * 100 > 5for: 1mlabels:severity: errorannotations:summary: "Instance {{ $labels.×××tance }} down"description: "{{ $labels.×××tance }} of job {{ $labels.job }} has been down for more than 5 minutes." 说明：由于是测试使用，将使用率调整为超过5%就报警
重载prometheus。查看prometheus ui中alert状态
查看规则是否生效
过片刻，收到报警
添加cpu报警规则文件内容如下：
groups:
- name: cpu.rulesrules:# Alert for any ×××tance that is unreachable for >5 minutes.- alert: NodeCpuUsageexpr: 100-irate(node_cpu_seconds_total{job="node",mode="idle"}[5m])*100 > 1for: 1mlabels:severity: errorannotations:summary: "{{ $labels.×××tance }} cpu useage load too high"description: "{{ $labels.×××tance }} of job {{ $labels.job }} has been too hgih for more than 1 minutes." 这里设置阈值为1%，只是测试使用。重载prometheus，过片刻收到报警
转载于:https://blog.51cto.com/lvsir666/2409063
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