Question

我在集群（https://github.com/coreos/prometheus-operator/tree/master/contrib/kube-prometheus）中设置了kube-prometheus。它包含一些默认警报，例如“ CoreDNSdown等”。如何创建我自己的警报？

任何人都可以提供示例示例来创建警报，该警报会将电子邮件发送到我的gmail帐户吗？

我遵循了这个Alert when docker container pod is in Error or CarshLoopBackOff kubernetes。但是我无法使其正常工作。

Answer 1

要将警报发送到您的gmail帐户，您需要在一个名为alertmanager.yaml的文件中设置alertmanager配置：

cat <<EOF > alertmanager.yml
route:
  group_by: [Alertname]
  # Send all notifications to me.
  receiver: email-me

receivers:
- name: email-me
  email_configs:
  - to: $GMAIL_ACCOUNT
    from: $GMAIL_ACCOUNT
    smarthost: smtp.gmail.com:587
    auth_username: "$GMAIL_ACCOUNT"
    auth_identity: "$GMAIL_ACCOUNT"
    auth_password: "$GMAIL_AUTH_TOKEN"
EOF

现在，当您使用kube-prometheus时，您将拥有一个名为alertmanager-main的秘密，它是alertmanager的默认配置。您需要使用以下命令，使用新配置再次创建机密alertmanager-main：

kubectl create secret generic alertmanager-main --from-file=alertmanager.yaml -n monitoring

现在，您的Alertmanager设置为在收到来自Prometheus的警报时发送电子邮件。

现在，您需要设置一个警报，邮件将在该警报上发送。您可以设置DeadManSwitch警报，该警报在每种情况下都会触发，并用于检查警报管道

groups:
- name: meta
  rules:
    - alert: DeadMansSwitch
      expr: vector(1)
      labels:
        severity: critical
      annotations:
        description: This is a DeadMansSwitch meant to ensure that the entire Alerting
          pipeline is functional.
        summary: Alerting DeadMansSwitch

此后，将触发DeadManSwitch警报，并应将电子邮件发送到您的邮件中。

参考链接：

https://coreos.com/tectonic/docs/latest/tectonic-prometheus-operator/user-guides/configuring-prometheus-alertmanager.html

编辑：

deadmanswitch警报应进入您的普罗米修斯正在读取的配置映射中。我将在这里分享我的普罗米修斯的相关快照：

"spec": {
        "alerting": {
            "alertmanagers": [
                {
                    "name": "alertmanager-main",
                    "namespace": "monitoring",
                    "port": "web"
                }
            ]
        },
        "baseImage": "quay.io/prometheus/prometheus",
        "replicas": 2,
        "resources": {
            "requests": {
                "memory": "400Mi"
            }
        },
        "ruleSelector": {
            "matchLabels": {
                "prometheus": "prafull",
                "role": "alert-rules"
            }
        },

上面的配置是我的prometheus.json文件的名称，该文件具有要使用的alertmanager的名称，以及ruleSelector，它将基于prometheus和role标签选择规则。所以我的规则配置映射如下：

kind: ConfigMap
apiVersion: v1
metadata:
  name: prometheus-rules
  namespace: monitoring
  labels:
    role: alert-rules
    prometheus: prafull
data:
  alert-rules.yaml: |+
   groups:
   - name: alerting_rules
     rules:
       - alert: LoadAverage15m
         expr: node_load15 >= 0.50
         labels:
           severity: major
         annotations:
           summary: "Instance {{ $labels.instance }} - high load average"
           description: "{{ $labels.instance  }} (measured by {{ $labels.job }}) has high load average ({{ $value }}) over 15 minutes."

在上方的配置图中替换DeadManSwitch。

Answer 2

如果您使用的是kube-promehtheus，则默认情况下它具有alertmanager-main secret和prometheus类设置。

步骤1：您必须删除alertmanager-main秘密

kubectl delete secret alertmanager-main -n monitoring

第2步：正如Praful所解释的那样，用新的变化创造秘密

cat <<EOF > alertmanager.yaml
route:
  group_by: [Alertname]
  # Send all notifications to me.
  receiver: email-me

receivers:
- name: email-me
  email_configs:
  - to: $GMAIL_ACCOUNT
    from: $GMAIL_ACCOUNT
    smarthost: smtp.gmail.com:587
    auth_username: "$GMAIL_ACCOUNT"
    auth_identity: "$GMAIL_ACCOUNT"
    auth_password: "$GMAIL_AUTH_TOKEN"
EOF

kubectl create secret generic alertmanager-main --from-file=alertmanager.yaml -n monitoring

第3步：您必须添加新的普罗米修斯规则

apiVersion: monitoring.coreos.com/v1
kind: PrometheusRule
metadata:
  creationTimestamp: null
  labels:
    prometheus: k8s
    role: alert-rules
  name: prometheus-podfail-rules
spec:
  groups:
  - name: ./podfail.rules
    rules:
    - alert: PodFailAlert
      expr: sum(kube_pod_container_status_restarts_total{container="ffmpeggpu"}) BY (container) > 10

NB：角色应该是角色：在规则选择器prometheus类型中指定的alert-rules，要检查使用情况

kubectl get prometheus k8s -n monitoring -o yaml

如何使用Prometheus Alert Manager在Kubernetes中触发警报

2 个答案: