4.8. 使用节点选择器移动日志记录子系统资源
您可以使用节点选择器将 Elasticsearch 和 Kibana Pod 部署到不同的节点上。
4.8.1. 移动 OpenShift Logging 资源
您可以配置 Cluster Logging Operator，以将用于日志记录子系统组件的 Pod（如 Elasticsearch 和 Kibana）部署到不同的节点上。您无法将 Cluster Logging Operator Pod 从其安装位置移走。
例如，您可以因为 CPU、内存和磁盘要求较高而将 Elasticsearch Pod 移到一个单独的节点上。
先决条件
- 必须安装 Red Hat OpenShift Logging 和 Elasticsearch Operator。默认情况下没有安装这些功能。
流程
编辑
openshift-logging项目中的ClusterLogging自定义资源（CR）：$ oc edit ClusterLogging instance
apiVersion: logging.openshift.io/v1 kind: ClusterLogging ... spec: collection: logs: fluentd: resources: null type: fluentd logStore: elasticsearch: nodeCount: 3 nodeSelector: 1 node-role.kubernetes.io/infra: '' tolerations: - effect: NoSchedule key: node-role.kubernetes.io/infra value: reserved - effect: NoExecute key: node-role.kubernetes.io/infra value: reserved redundancyPolicy: SingleRedundancy resources: limits: cpu: 500m memory: 16Gi requests: cpu: 500m memory: 16Gi storage: {} type: elasticsearch managementState: Managed visualization: kibana: nodeSelector: 2 node-role.kubernetes.io/infra: '' tolerations: - effect: NoSchedule key: node-role.kubernetes.io/infra value: reserved - effect: NoExecute key: node-role.kubernetes.io/infra value: reserved proxy: resources: null replicas: 1 resources: null type: kibana ...
验证
要验证组件是否已移动，您可以使用 oc get pod -o wide 命令。
例如：
您需要移动来自
ip-10-0-147-79.us-east-2.compute.internal节点上的 Kibana pod：$ oc get pod kibana-5b8bdf44f9-ccpq9 -o wide
输出示例
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES kibana-5b8bdf44f9-ccpq9 2/2 Running 0 27s 10.129.2.18 ip-10-0-147-79.us-east-2.compute.internal <none> <none>
您需要将 Kibana pod 移到
ip-10-0-139-48.us-east-2.compute.internal节点，该节点是一个专用的基础架构节点：$ oc get nodes
输出示例
NAME STATUS ROLES AGE VERSION ip-10-0-133-216.us-east-2.compute.internal Ready master 60m v1.22.1 ip-10-0-139-146.us-east-2.compute.internal Ready master 60m v1.22.1 ip-10-0-139-192.us-east-2.compute.internal Ready worker 51m v1.22.1 ip-10-0-139-241.us-east-2.compute.internal Ready worker 51m v1.22.1 ip-10-0-147-79.us-east-2.compute.internal Ready worker 51m v1.22.1 ip-10-0-152-241.us-east-2.compute.internal Ready master 60m v1.22.1 ip-10-0-139-48.us-east-2.compute.internal Ready infra 51m v1.22.1
请注意，该节点具有
node-role.kubernetes.io/infra: "label:$ oc get node ip-10-0-139-48.us-east-2.compute.internal -o yaml
输出示例
kind: Node apiVersion: v1 metadata: name: ip-10-0-139-48.us-east-2.compute.internal selfLink: /api/v1/nodes/ip-10-0-139-48.us-east-2.compute.internal uid: 62038aa9-661f-41d7-ba93-b5f1b6ef8751 resourceVersion: '39083' creationTimestamp: '2020-04-13T19:07:55Z' labels: node-role.kubernetes.io/infra: '' ...要移动 Kibana pod，编辑
ClusterLoggingCR 以添加节点选择器：apiVersion: logging.openshift.io/v1 kind: ClusterLogging ... spec: ... visualization: kibana: nodeSelector: 1 node-role.kubernetes.io/infra: '' proxy: resources: null replicas: 1 resources: null type: kibana- 1
- 添加节点选择器以匹配节点规格中的 label。
保存 CR 后，当前 Kibana Pod 将被终止，新的 Pod 会被部署：
$ oc get pods
输出示例
NAME READY STATUS RESTARTS AGE cluster-logging-operator-84d98649c4-zb9g7 1/1 Running 0 29m elasticsearch-cdm-hwv01pf7-1-56588f554f-kpmlg 2/2 Running 0 28m elasticsearch-cdm-hwv01pf7-2-84c877d75d-75wqj 2/2 Running 0 28m elasticsearch-cdm-hwv01pf7-3-f5d95b87b-4nx78 2/2 Running 0 28m fluentd-42dzz 1/1 Running 0 28m fluentd-d74rq 1/1 Running 0 28m fluentd-m5vr9 1/1 Running 0 28m fluentd-nkxl7 1/1 Running 0 28m fluentd-pdvqb 1/1 Running 0 28m fluentd-tflh6 1/1 Running 0 28m kibana-5b8bdf44f9-ccpq9 2/2 Terminating 0 4m11s kibana-7d85dcffc8-bfpfp 2/2 Running 0 33s
新 pod 位于
ip-10-0-139-48.us-east-2.compute.internal节点上 :$ oc get pod kibana-7d85dcffc8-bfpfp -o wide
输出示例
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES kibana-7d85dcffc8-bfpfp 2/2 Running 0 43s 10.131.0.22 ip-10-0-139-48.us-east-2.compute.internal <none> <none>
片刻后，原始 Kibana Pod 将被删除。
$ oc get pods
输出示例
NAME READY STATUS RESTARTS AGE cluster-logging-operator-84d98649c4-zb9g7 1/1 Running 0 30m elasticsearch-cdm-hwv01pf7-1-56588f554f-kpmlg 2/2 Running 0 29m elasticsearch-cdm-hwv01pf7-2-84c877d75d-75wqj 2/2 Running 0 29m elasticsearch-cdm-hwv01pf7-3-f5d95b87b-4nx78 2/2 Running 0 29m fluentd-42dzz 1/1 Running 0 29m fluentd-d74rq 1/1 Running 0 29m fluentd-m5vr9 1/1 Running 0 29m fluentd-nkxl7 1/1 Running 0 29m fluentd-pdvqb 1/1 Running 0 29m fluentd-tflh6 1/1 Running 0 29m kibana-7d85dcffc8-bfpfp 2/2 Running 0 62s
