Deploying API Gateway Pod with API Gateway and Elasticsearch Containers

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Select this deployment model if you want webMethods API Gateway as a Kubernetes service protecting the native services deployed to Kubernetes. Here, webMethods API Gateway runs in dedicated pods, and each pod has external Elasticsearch and Kibana containers. webMethods API Gateway routes the incoming API requests to the native services. The invocation of the native services by the consumers happens through APIs provisioned by webMethods API Gateway.

The figure depicts the webMethods API Gateway Kubernetes service deployment model where you have a single webMethods API Gateway pod that contains webMethods API Gateway and Elasticsearch containers. The external Kibana can either be embedded in the webMethods API Gateway container or can reside as a separate container within the pod.

To deploy webMethods API Gateway Kubernetes pod that contains an Elasticsearch container

Ensure that vm.max_map_count is set to a value of at least 262144 to run an Elasticsearch container within a pod. This is done in an init container as follows:

initContainers: 
- command: 
  - sysctl 
  - -w 
  -	vm.max_map_count=262144 
image: busybox 
imagePullPolicy: IfNotPresent 
name: init-sysctl 
resources: {} 
securityContext:    
  privileged: true

Ensure that you have an webMethods API Gateway Docker image and an Elasticsearch image for this deployment. For the webMethods API Gateway container, you have to set the following environment:
```
apigw_elasticsearch_hosts=localhost:9200
```
This assumes that Elasticsearch runs on the standard port 9200 and the xpack.security is disabled. You can disable the xpack.security by setting the environment variable xpack.security.enabled to false.

The following YAML snippet displays how the environment variable apigw_elasticsearch_hosts is set.
```
spec:
  containers:
  - env:
    - name: apigw_elasticsearch_hosts
      value: localhost:9200
```
You can disable the xpack.security by setting the environment variable xpack.security.enabled to false for the Elasticsearch container.
Run the following command to deploy webMethods API Gateway in the Kubernetes setup:
```
kubectl create -f api-gateway-deployment-embedded-elasticsearch.yaml
```
Ensure that you have specified the required information such as image name, default ports in the Kubernetes sample file api-gateway-deployment-embedded-elasticsearch.yaml located at InstallDir/IntegrationServer/instances/default/packages/WmAPIGateway/resources/samples/K8s. For details on Kubernetes YAML files, see Kubernetes documentation.

This now pulls the image specified and creates the webMethods API Gateway pod with webMethods API Gateway and Elasticsearch containers.

Run the command kubectl get pods to view the pods created.