Chapter 8. Moving the cluster logging resources with node selectors


You can use node selectors to deploy the Elasticsearch, Kibana, and Curator pods to different nodes.

Each component specification allows the component to target a specific node.

Prerequisites

  • Cluster logging and Elasticsearch must be installed. These features are not installed by default.

Procedure

  1. Add the desired label to your nodes:

    $ oc label <resource> <name> <key>=<value>
    Copy to Clipboard Toggle word wrap

    For example, to label a node:

    $ oc label nodes ip-10-0-142-25.ec2.internal type=elasticsearch
    Copy to Clipboard Toggle word wrap
  2. Edit the Cluster Logging Custom Resource in the openshift-logging project:

    $ oc edit ClusterLogging instance
    
    apiVersion: "logging.openshift.io/v1"
    kind: "ClusterLogging"
    metadata:
      name: "nodeselector"
    spec:
      managementState: "Managed"
      logStore:
        type: "elasticsearch"
        elasticsearch:
          nodeSelector:  
    1
    
            logging: es
          nodeCount: 1
          resources:
            limits:
              memory: 2Gi
            requests:
              cpu: 200m
              memory: 2Gi
          storage:
            size: "20G"
            storageClassName: "gp2"
          redundancyPolicy: "ZeroRedundancy"
      visualization:
        type: "kibana"
        kibana:
          nodeSelector:  
    2
    
            logging: kibana
          replicas: 1
      curation:
        type: "curator"
        curator:
          nodeSelector:  
    3
    
            logging: curator
          schedule: "*/10 * * * *"
      collection:
        logs:
          type: "fluentd"
          fluentd:
            nodeSelector:  
    4
    
            logging: fluentd
    Copy to Clipboard Toggle word wrap
1
Node selector for Elasticsearch.
2
Node selector for Kibana.
3
Node selector for Curator.
4
Node selector for Fluentd.
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