0x01 修改alertmanager.yaml配置文件
我的alertmanager是kube-prometheus部署，alertmanager.yaml是通过secrets挂载到
alertmanager的。
# 创建一个带有邮件告警信息的配置
root@iZbp1bddlmdujngbc11omnZ:~/prom# vi alertmanager.yaml
global:
resolve_timeout: 5m
smtp_smarthost: 'smtp.exmail.qq.com:465'
smtp_hello: 'itho.cn'
smtp_from: 'support@itho.cn'
smtp_auth_username: 'support@itho.cn'
smtp_auth_password: 'xxxxxxxxx'
smtp_require_tls: true
inhibit_rules:
- equal:
- namespace
- alertname
source_match:
severity: critical
target_match_re:
severity: warning|info
- equal:
- namespace
- alertname
source_match:
severity: warning
target_match_re:
severity: info
receivers:
- name: email_myluzh
email_configs:
- to: 'myluzh@qq.com'
send_resolved: true
- name: null_receiver
route:
group_by:
- namespace
group_interval: 5m
group_wait: 30s
receiver: email_myluzh
repeat_interval: 12h
routes:
- match:
alertname: Watchdog
receiver: null_receiver
- match:
severity: critical
receiver: null_receiver
# 从 alertmanager.yaml 文件生成一个 Kubernetes Secret 资源的 YAML 文件，并将其内容保存到 alertmanager-main-generated.yaml 文件中
root@iZbp1bddlmdujngbc11omnZ:~/prom# kubectl create secret generic alertmanager-main-generated --from-file=alertmanager.yaml --dry-run=client -o yaml > alertmanager-main-generated.yaml
# 删除原来有alertmanager-main-generated配置
root@iZbp1bddlmdujngbc11omnZ:~/prom# kubectl delete secrets alertmanager-main-generated -n monitoring
secret "alertmanager-main-generated" deleted
# 应用新的alertmanager-main-generated配置
root@iZbp1bddlmdujngbc11omnZ:~/prom# kubectl apply -f alertmanager-main-generated.yaml -n monitoring
secret/alertmanager-main-generated created
如果要配置只有符合 namespace="dev-test" 的告警会发送到邮箱，可以如下配置：
1、将 route 的默认 receiver 设置为 null_receiver，以便丢弃未匹配的告警。
2、在 routes 中，新增 namespace: dev-test 的匹配条件，并指定接收器为 email_myluzh，这样只有 namespace="dev-test" 的告警会发送到 myluzh@qq.com。
route:
group_by:
- namespace
group_interval: 5m
group_wait: 30s
receiver: null_receiver # 默认接收器，不发送告警
repeat_interval: 12h
routes:
- match:
namespace: dev-test # 仅匹配 namespace="dev-test"
receiver: email_myluzh
receivers:
- name: email_myluzh
email_configs:
- send_resolved: true
to: myluzh@qq.com
- name: null_receiver # 空接收器，不发送告警
0x02 测试验证
如果告警后没有成功发送邮件，可以查看日志 kubectl logs alertmanager-main-0 -n monitoring -c alertmanager
参考链接： https://prometheus.io/docs/alerting/latest/configuration/
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