Setting up an opensearch cluster

Kubernetes YAML:

apiVersion: v1
kind: Secret
metadata:
  annotations:
    field.cattle.io/description: Access credentials for Ceph S3 storage
  name: s3-credentials
  namespace: opensearch
stringData:
  accessKey: <from S3 service>
  secretKey: <from S3 service>
---
apiVersion: v1
kind: Secret
metadata:
  annotations:
    field.cattle.io/description: Access credentials for the opensearch admin user
  name: opensearch-admin-credentials-prod
  namespace: opensearch
stringData:
  username: admin
  password: <generate a random one>
---
apiVersion: v1
kind: Secret
metadata:
  name: opensearch-securityconfig-prod
  namespace: opensearch
stringData:
  internal_users.yml: |
    _meta:
      type: "internalusers" 
      config_version: 2
    admin:
      hash: "<bcrypt the password from above>"  
      reserved: true
      backend_roles:
      - "admin" 
      description: "Admin user managed by the Kubernetes operator"   
---
apiVersion: opensearch.opster.io/v1
kind: OpenSearchCluster
metadata:
  name: opensearch-prod
  namespace: opensearch
spec:
  bootstrap:
    resources: {}
  confMgmt: {}
  dashboards:
    enable: true
    opensearchCredentialsSecret:
      name: opensearch-admin-credentials-prod
    replicas: 1
    resources:
      limits:
        cpu: '1'
        memory: 2Gi
      requests:
        cpu: '1'
        memory: 1Gi
    service:
      type: ClusterIP
    tls:
      caSecret: {}
      enable: true
      generate: true
      secret: {}
    version: 2.8.0
  general:
    drainDataNodes: true
    httpPort: 9200
    keystore:
      - keyMappings:
          accessKey: s3.client.default.access_key
          secretKey: s3.client.default.secret_key
        secret:
          name: s3-credentials
    pluginsList:
      - repository-s3
    serviceName: opensearch-prod
    version: 2.8.0
  initHelper: {}
  nodePools:
    - additionalConfig:
        http.cors.allow-credentials: 'true'
        http.cors.allow-origin: >-
          /https?:\/\/(localhost|dboefrontend(-test)?\.cluster\.machine-deck\.jeffries-tube\.at)(:[0-9]+)?/
        http.cors.enabled: 'true'
        s3.client.default.endpoint: s3.cluster.machine-deck.jeffries-tube.at
        s3.client.default.path_style_access: 'true'
        s3.client.default.protocol: https
      component: masters
      diskSize: 25Gi
      jvm: '-Xmx2g -Xms2g'
      persistence:
        pvc:
          accessModes:
            - ReadWriteOnce
          storageClass: local-disks
      replicas: 3
      resources:
        limits:
          cpu: '2'
          memory: 4Gi
        requests:
          cpu: '2'
          memory: 4Gi
      roles:
        - data
        - cluster_manager
  security:
    config:
      adminCredentialsSecret:
        name: opensearch-admin-credentials-prod
      adminSecret: {}
      securityConfigSecret:
        name: opensearch-securityconfig-prod
    tls:
      http:
        caSecret: {}
        generate: true
        secret: {}
      transport:
        caSecret: {}
        generate: true
        perNode: true
        secret: {}
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    cert-manager.io/cluster-issuer: letsencrypt-prod
    nginx.ingress.kubernetes.io/backend-protocol: HTTPS
  name: opensearch-api
  namespace: opensearch
spec:
  rules:
    - host: opensearch-api.cluster.machine-deck.jeffries-tube.at
      http:
        paths:
          - backend:
              service:
                name: opensearch-prod-masters
                port:
                  number: 9200
            path: /
            pathType: Prefix
  tls:
    - hosts:
        - opensearch-api.cluster.machine-deck.jeffries-tube.at
      secretName: opensearch-api-tls
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    cert-manager.io/cluster-issuer: letsencrypt-prod
    nginx.ingress.kubernetes.io/backend-protocol: HTTPS
  name: opensearch-dashboards
  namespace: opensearch
spec:
  rules:
    - host: opensearch.cluster.machine-deck.jeffries-tube.at
      http:
        paths:
          - backend:
              service:
                name: opensearch-prod-dashboards
                port:
                  number: 5601
            path: /
            pathType: Prefix
  tls:
    - hosts:
        - opensearch.cluster.machine-deck.jeffries-tube.at
      secretName: opensearch-dashboards-tls

• Make sure the sysctl setting vm.max_map_count is 262144 on all cluster nodes
• If something goes wrong start all over, first install tends to hang if certain race conditions are met
  • delete the opensearch cluster definition
  • delete the PVC
  • delete the released local-disk PV
• For Ceph S3: there is usually no bucket path, just the name