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Combined Cluster
An Elasticsearch combined cluster is a group of one or more Elasticsearch nodes where each node can perform as master, data, and ingest nodes simultaneously.
Before You Begin
At first, you need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster. If you do not already have a cluster, you can create one by using kind.
Now, install the KubeDB operator in your cluster following the steps here.
To keep things isolated, this tutorial uses a separate namespace called demo throughout this tutorial.
$ kubectl create namespace demo
namespace/demo created
$ kubectl get namespace
NAME STATUS AGE
demo Active 9s
Note: YAML files used in this tutorial are stored in here in GitHub repository kubedb/docs.
Create Standalone Elasticsearch Cluster
Here, we are going to create a standalone (ie. replicas: 1) Elasticsearch cluster. We will use the Elasticsearch image provided by the Opendistro (opensearch-2.8.0) for this demo. To learn more about Elasticsearch CR, visit here.
apiVersion: kubedb.com/v1alpha2
kind: Elasticsearch
metadata:
name: es-standalone
namespace: demo
spec:
version: opensearch-2.8.0
enableSSL: true
replicas: 1
storageType: Durable
storage:
storageClassName: "standard"
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
terminationPolicy: DoNotTerminate
Let’s deploy the above example by the following command:
$ kubectl create -f https://github.com/kubedb/docs/raw/v2023.12.21/docs/guides/elasticsearch/clustering/combined-cluster/yamls/es-standalone.yaml
elasticsearch.kubedb.com/es-standalone created
Watch the bootstrap progress:
$ kubectl get elasticsearch -n demo -w
NAME VERSION STATUS AGE
es-standalone opensearch-2.8.0 Provisioning 1m32s
es-standalone opensearch-2.8.0 Provisioning 2m17s
es-standalone opensearch-2.8.0 Provisioning 2m17s
es-standalone opensearch-2.8.0 Provisioning 2m20s
es-standalone opensearch-2.8.0 Ready 2m20s
Hence the cluster is ready to use. Let’s check the k8s resources created by the operator on the deployment of Elasticsearch CRO:
$ kubectl get all,secret,pvc -n demo -l 'app.kubernetes.io/instance=es-standalone'
NAME READY STATUS RESTARTS AGE
pod/es-standalone-0 1/1 Running 0 33m
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/es-standalone ClusterIP 10.96.46.11 <none> 9200/TCP 33m
service/es-standalone-master ClusterIP None <none> 9300/TCP 33m
service/es-standalone-pods ClusterIP None <none> 9200/TCP 33m
NAME READY AGE
statefulset.apps/es-standalone 1/1 33m
NAME TYPE VERSION AGE
appbinding.appcatalog.appscode.com/es-standalone kubedb.com/elasticsearch 7.10.0 33m
NAME TYPE DATA AGE
secret/es-standalone-admin-cert kubernetes.io/tls 3 33m
secret/es-standalone-admin-cred kubernetes.io/basic-auth 2 33m
secret/es-standalone-archiver-cert kubernetes.io/tls 3 33m
secret/es-standalone-ca-cert kubernetes.io/tls 2 33m
secret/es-standalone-config Opaque 3 33m
secret/es-standalone-http-cert kubernetes.io/tls 3 33m
secret/es-standalone-kibanaro-cred kubernetes.io/basic-auth 2 33m
secret/es-standalone-kibanaserver-cred kubernetes.io/basic-auth 2 33m
secret/es-standalone-logstash-cred kubernetes.io/basic-auth 2 33m
secret/es-standalone-readall-cred kubernetes.io/basic-auth 2 33m
secret/es-standalone-snapshotrestore-cred kubernetes.io/basic-auth 2 33m
secret/es-standalone-transport-cert kubernetes.io/tls 3 33m
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
persistentvolumeclaim/data-es-standalone-0 Bound pvc-a2d3e491-1d66-4b29-bb18-d5f06905336c 1Gi RWO standard 33m
Connect to the Cluster:
# Port-forward the service to local machine
$ kubectl port-forward -n demo svc/es-standalone 9200
Forwarding from 127.0.0.1:9200 -> 9200
Forwarding from [::1]:9200 -> 9200
# Get admin username & password from k8s secret
$ kubectl get secret -n demo es-standalone-admin-cred -o jsonpath='{.data.username}' | base64 -d
admin
$ kubectl get secret -n demo es-standalone-admin-cred -o jsonpath='{.data.password}' | base64 -d
V,YY1.qXxoAch9)B
# Check cluster health
$ curl -XGET -k -u 'admin:V,YY1.qXxoAch9)B' "https://localhost:9200/_cluster/health?pretty"
{
"cluster_name" : "es-standalone",
"status" : "green",
"timed_out" : false,
"number_of_nodes" : 1,
"number_of_data_nodes" : 1,
"active_primary_shards" : 1,
"active_shards" : 1,
"relocating_shards" : 0,
"initializing_shards" : 0,
"unassigned_shards" : 0,
"delayed_unassigned_shards" : 0,
"number_of_pending_tasks" : 0,
"number_of_in_flight_fetch" : 0,
"task_max_waiting_in_queue_millis" : 0,
"active_shards_percent_as_number" : 100.0
}
Create Multi-Node Combined Elasticsearch Cluster
Here, we are going to create a multi-node (say replicas: 3) Elasticsearch cluster. We will use the Elasticsearch image provided by the Opendistro (opensearch-2.8.0) for this demo. To learn more about Elasticsearch CR, visit here.
apiVersion: kubedb.com/v1alpha2
kind: Elasticsearch
metadata:
name: es-multinode
namespace: demo
spec:
version: opensearch-2.8.0
enableSSL: true
replicas: 3
storageType: Durable
storage:
storageClassName: "standard"
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
terminationPolicy: DoNotTerminate
Let’s deploy the above example by the following command:
$ kubectl create -f https://github.com/kubedb/docs/raw/v2023.12.21/docs/guides/elasticsearch/clustering/combined-cluster/yamls/es-multinode.yaml
elasticsearch.kubedb.com/es-multinode created
Watch the bootstrap progress:
$ kubectl get elasticsearch -n demo -w
NAME VERSION STATUS AGE
es-multinode opensearch-2.8.0 Provisioning 18s
es-multinode opensearch-2.8.0 Provisioning 78s
es-multinode opensearch-2.8.0 Provisioning 78s
es-multinode opensearch-2.8.0 Provisioning 81s
es-multinode opensearch-2.8.0 Ready 81s
Hence the cluster is ready to use. Let’s check the k8s resources created by the operator on the deployment of Elasticsearch CRO:
$ kubectl get all,secret,pvc -n demo -l 'app.kubernetes.io/instance=es-multinode'
NAME READY STATUS RESTARTS AGE
pod/es-multinode-0 1/1 Running 0 6m12s
pod/es-multinode-1 1/1 Running 0 6m7s
pod/es-multinode-2 1/1 Running 0 6m2s
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/es-multinode ClusterIP 10.96.237.120 <none> 9200/TCP 6m14s
service/es-multinode-master ClusterIP None <none> 9300/TCP 6m14s
service/es-multinode-pods ClusterIP None <none> 9200/TCP 6m15s
NAME READY AGE
statefulset.apps/es-multinode 3/3 6m12s
NAME TYPE VERSION AGE
appbinding.appcatalog.appscode.com/es-multinode kubedb.com/elasticsearch 7.10.0 6m12s
NAME TYPE DATA AGE
secret/es-multinode-admin-cert kubernetes.io/tls 3 6m14s
secret/es-multinode-admin-cred kubernetes.io/basic-auth 2 6m13s
secret/es-multinode-archiver-cert kubernetes.io/tls 3 6m13s
secret/es-multinode-ca-cert kubernetes.io/tls 2 6m14s
secret/es-multinode-config Opaque 3 6m12s
secret/es-multinode-http-cert kubernetes.io/tls 3 6m14s
secret/es-multinode-kibanaro-cred kubernetes.io/basic-auth 2 6m13s
secret/es-multinode-kibanaserver-cred kubernetes.io/basic-auth 2 6m13s
secret/es-multinode-logstash-cred kubernetes.io/basic-auth 2 6m13s
secret/es-multinode-readall-cred kubernetes.io/basic-auth 2 6m13s
secret/es-multinode-snapshotrestore-cred kubernetes.io/basic-auth 2 6m13s
secret/es-multinode-transport-cert kubernetes.io/tls 3 6m14s
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
persistentvolumeclaim/data-es-multinode-0 Bound pvc-c031bd37-2266-4a0b-8d9f-313281379810 1Gi RWO standard 6m12s
persistentvolumeclaim/data-es-multinode-1 Bound pvc-e75bc8a8-15ed-4522-b0b3-252ff6c841a8 1Gi RWO standard 6m7s
persistentvolumeclaim/data-es-multinode-2 Bound pvc-6452fa80-91c6-4d71-9b93-5cff973a2625 1Gi RWO standard 6m2s
Connect to the Cluster:
# Port-forward the service to local machine
$ kubectl port-forward -n demo svc/es-multinode 9200
Forwarding from 127.0.0.1:9200 -> 9200
Forwarding from [::1]:9200 -> 9200
# Get admin username & password from k8s secret
$ kubectl get secret -n demo es-multinode-admin-cred -o jsonpath='{.data.username}' | base64 -d
admin
$ kubectl get secret -n demo es-multinode-admin-cred -o jsonpath='{.data.password}' | base64 -d
9f$A8o2pBpKL~1T8
# Check cluster health
$ curl -XGET -k -u 'admin:9f$A8o2pBpKL~1T8' "https://localhost:9200/_cluster/health?pretty"
{
"cluster_name" : "es-multinode",
"status" : "green",
"timed_out" : false,
"number_of_nodes" : 3,
"number_of_data_nodes" : 3,
"active_primary_shards" : 1,
"active_shards" : 3,
"relocating_shards" : 0,
"initializing_shards" : 0,
"unassigned_shards" : 0,
"delayed_unassigned_shards" : 0,
"number_of_pending_tasks" : 0,
"number_of_in_flight_fetch" : 0,
"task_max_waiting_in_queue_millis" : 0,
"active_shards_percent_as_number" : 100.0
}
Cleaning Up
TO cleanup the k8s resources created by this tutorial, run:
# standalone cluster
$ kubectl patch -n demo elasticsearch es-standalone -p '{"spec":{"terminationPolicy":"WipeOut"}}' --type="merge"
$ kubectl delete elasticsearch -n demo es-standalone
# multinode cluster
$ kubectl patch -n demo elasticsearch es-multinode -p '{"spec":{"terminationPolicy":"WipeOut"}}' --type="merge"
$ kubectl delete elasticsearch -n demo es-multinode
# delete namespace
$ kubectl delete namespace demo
Next Steps
- Deploy simple dedicated topology cluster
- Learn about taking backup of Elasticsearch database using Stash.
- Monitor your Elasticsearch database with KubeDB using
out-of-the-boxbuiltin-Prometheus. - Monitor your Elasticsearch database with KubeDB using
out-of-the-boxPrometheus operator. - Detail concepts of Elasticsearch object.
- Use private Docker registry to deploy Elasticsearch with KubeDB.
- Want to hack on KubeDB? Check our contribution guidelines.