elasticsearchHow do I deploy Elasticsearch on Kubernetes?

1. Create a Kubernetes cluster: The first step is to create a Kubernetes cluster. This can be done using the kubectl create cluster command.

2. Install Helm: Helm is a package manager for Kubernetes and is needed to install the Elasticsearch Helm chart. Helm can be installed using the command helm init.

3. Install the Elasticsearch Helm chart: The Elasticsearch Helm chart can be installed using the command helm install stable/elasticsearch. This will create a deployment with the necessary components for running Elasticsearch on Kubernetes.

4. Configure the Elasticsearch deployment: The configuration for the Elasticsearch deployment can be done using a values.yaml file. This file can be used to configure the number of replicas, memory and CPU limits, and other settings.

5. Create a service for the Elasticsearch deployment: The Elasticsearch deployment needs to be exposed to the outside world. This can be done by creating a service using the command kubectl expose deployment <deployment-name> --type=LoadBalancer.

6. Verify the deployment: Once the deployment is complete, it can be verified using the command kubectl get pods. This will list all the pods that have been created for the Elasticsearch deployment.

7. Access the Elasticsearch cluster: After the deployment is complete, the Elasticsearch cluster can be accessed using the service endpoint.

curl http://<service-endpoint>:9200

Output example

{
  "name" : "elasticsearch-cluster",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "abc123",
  "version" : {
    "number" : "7.0.0",
    ...
  },
  ...
}

Code explanation

**

• kubectl create cluster: This command creates a Kubernetes cluster.
• helm init: This command installs Helm, a package manager for Kubernetes.
• helm install stable/elasticsearch: This command installs the Elasticsearch Helm chart.
• values.yaml: This file is used to configure the Elasticsearch deployment.
• kubectl expose deployment <deployment-name> --type=LoadBalancer: This command creates a service for the Elasticsearch deployment.
• kubectl get pods: This command lists all the pods that have been created for the Elasticsearch deployment.
• curl http://<service-endpoint>:9200: This command accesses the Elasticsearch cluster.

## Helpful links

• Kubernetes Documentation
• Helm Documentation
• Elasticsearch Helm Chart Documentation

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