7.8. 收集并存储 Kubernetes 事件

流程

1. 为事件路由器创建模板：

   kind: Template
   apiVersion: v1
   metadata:
     name: eventrouter-template
     annotations:
       description: "A pod forwarding kubernetes events to cluster logging stack."
       tags: "events,EFK,logging,cluster-logging"
   objects:
     - kind: ServiceAccount 1
       apiVersion: v1
       metadata:
         name: eventrouter
         namespace: ${NAMESPACE}
     - kind: ClusterRole 2
       apiVersion: v1
       metadata:
         name: event-reader
       rules:
       - apiGroups: [""]
         resources: ["events"]
         verbs: ["get", "watch", "list"]
     - kind: ClusterRoleBinding  3
       apiVersion: v1
       metadata:
         name: event-reader-binding
       subjects:
       - kind: ServiceAccount
         name: eventrouter
         namespace: ${NAMESPACE}
       roleRef:
         kind: ClusterRole
         name: event-reader
     - kind: ConfigMap 4
       apiVersion: v1
       metadata:
         name: eventrouter
         namespace: ${NAMESPACE}
       data:
         config.json: |-
           {
             "sink": "stdout"
           }
     - kind: Deployment 5
       apiVersion: apps/v1
       metadata:
         name: eventrouter
         namespace: ${NAMESPACE}
         labels:
           component: eventrouter
           logging-infra: eventrouter
           provider: openshift
       spec:
         selector:
           matchLabels:
             component: eventrouter
             logging-infra: eventrouter
             provider: openshift
         replicas: 1
         template:
           metadata:
             labels:
               component: eventrouter
               logging-infra: eventrouter
               provider: openshift
             name: eventrouter
           spec:
             serviceAccount: eventrouter
             containers:
               - name: kube-eventrouter
                 image: ${IMAGE}
                 imagePullPolicy: IfNotPresent
                 resources:
                   requests:
                     cpu: ${CPU}
                     memory: ${MEMORY}
                 volumeMounts:
                 - name: config-volume
                   mountPath: /etc/eventrouter
             volumes:
               - name: config-volume
                 configMap:
                   name: eventrouter
   parameters:
     - name: IMAGE
       displayName: Image
       value: "registry.redhat.io/openshift4/ose-logging-eventrouter:latest"
     - name: CPU  6
       displayName: CPU
       value: "100m"
     - name: MEMORY 7
       displayName: Memory
       value: "128Mi"
     - name: NAMESPACE
       displayName: Namespace
       value: "openshift-logging" 8

   1

   在 openshift-logging 项目中为事件路由器创建一个服务帐户。

   2

   创建用于监控集群中事件的 ClusterRole。

   3

   创建一个 ClusterRoleBinding 将 ClusterRole 绑定到 ServiceAccount。

   4

   在 openshift-logging 项目中创建一个 ConfigMap 来生成所需的 config.json 文件。

   5

   在 openshift-logging 项目中创建一个 Deployment 对象，以生成和配置 Event Router pod。

   6

   指定分配给事件路由器 pod 的最小内存量。默认值为128Mi。

   7

   指定分配给事件路由器 pod 的最小 CPU 量。默认值为100m。

   8

   指定要在其中安装对象的 openshift-logging 项目。

2. 使用以下命令来处理和应用模板：

   $ oc process -f <templatefile> | oc apply -n openshift-logging -f -

   例如：

   $ oc process -f eventrouter.yaml | oc apply -n openshift-logging -f -

   输出示例

   serviceaccount/logging-eventrouter created
   clusterrole.authorization.openshift.io/event-reader created
   clusterrolebinding.authorization.openshift.io/event-reader-binding created
   configmap/logging-eventrouter created
   deployment.apps/logging-eventrouter created

3. 验证 openshift-logging 项目中安装的 Event Router:

   1. 查看新的事件路由器 Pod:

      $ oc get pods --selector  component=eventrouter -o name -n openshift-logging

      输出示例

      pod/cluster-logging-eventrouter-d649f97c8-qvv8r

   2. 查看事件路由器收集的事件：

      $ oc logs <cluster_logging_eventrouter_pod> -n openshift-logging

      例如：

      $ oc logs cluster-logging-eventrouter-d649f97c8-qvv8r -n openshift-logging

      输出示例

      {"verb":"ADDED","event":{"metadata":{"name":"openshift-service-catalog-controller-manager-remover.1632d931e88fcd8f","namespace":"openshift-service-catalog-removed","selfLink":"/api/v1/namespaces/openshift-service-catalog-removed/events/openshift-service-catalog-controller-manager-remover.1632d931e88fcd8f","uid":"787d7b26-3d2f-4017-b0b0-420db4ae62c0","resourceVersion":"21399","creationTimestamp":"2020-09-08T15:40:26Z"},"involvedObject":{"kind":"Job","namespace":"openshift-service-catalog-removed","name":"openshift-service-catalog-controller-manager-remover","uid":"fac9f479-4ad5-4a57-8adc-cb25d3d9cf8f","apiVersion":"batch/v1","resourceVersion":"21280"},"reason":"Completed","message":"Job completed","source":{"component":"job-controller"},"firstTimestamp":"2020-09-08T15:40:26Z","lastTimestamp":"2020-09-08T15:40:26Z","count":1,"type":"Normal"}}

      您还可以使用 Elasticsearch infra index 创建索引模式来使用 Kibana 来查看事件。