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4.6.4. 移动 OpenShift Logging 资源

您可以配置 Cluster Logging Operator，将 OpenShift Logging 组件（如 Elasticsearch 和 Kibana）的 pod 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 OpenShift Logging 和 Elasticsearch。默认情况下没有安装这些功能。

流程

  1. 编辑 openshift-logging 项目中的 ClusterLogging 自定义资源（CR）： 

    $ oc edit ClusterLogging instance
    Copy to Clipboard Toggle word wrap 
    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: ''
      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: ''
      proxy:
        resources: null
      replicas: 1
      resources: null
    type: kibana

...
    Copy to Clipboard Toggle word wrap
1 2
添加 nodeSelector 参数，并设为适用于您想要移动的组件的值。您可以根据为节点指定的值，按所示格式使用 nodeSelector 或使用 <key>: <value> 对。

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
    Copy to Clipboard Toggle word wrap

    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>
    Copy to Clipboard Toggle word wrap

  • 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
    Copy to Clipboard Toggle word wrap

    输出示例

    NAME                                         STATUS   ROLES          AGE   VERSION
ip-10-0-133-216.us-east-2.compute.internal   Ready    master         60m   v1.20.0
ip-10-0-139-146.us-east-2.compute.internal   Ready    master         60m   v1.20.0
ip-10-0-139-192.us-east-2.compute.internal   Ready    worker         51m   v1.20.0
ip-10-0-139-241.us-east-2.compute.internal   Ready    worker         51m   v1.20.0
ip-10-0-147-79.us-east-2.compute.internal    Ready    worker         51m   v1.20.0
ip-10-0-152-241.us-east-2.compute.internal   Ready    master         60m   v1.20.0
ip-10-0-139-48.us-east-2.compute.internal    Ready    infra          51m   v1.20.0
    Copy to Clipboard Toggle word wrap

    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
    Copy to Clipboard Toggle word wrap

    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: ''
...
    Copy to Clipboard Toggle word wrap

  • 要移动 Kibana pod，编辑 ClusterLogging CR 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
    Copy to Clipboard Toggle word wrap
    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
    Copy to Clipboard Toggle word wrap

    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
    Copy to Clipboard Toggle word wrap

  • 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
    Copy to Clipboard Toggle word wrap

    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>
    Copy to Clipboard Toggle word wrap

  • 片刻后，原始 Kibana Pod 将被删除。 

    $ oc get pods
    Copy to Clipboard Toggle word wrap

    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
    Copy to Clipboard Toggle word wrap

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