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MarkLogic Server on Kubernetes

Native Kubernetes

In a native Kubernetes environment, access MarkLogic using the ClusterIP service, DNS record, or port forward.

Use the ClusterIP service

You can use the ClusterIP service to access MarkLogic within a Kubernetes cluster. The ClusterIP service includes Helm Chart installation.

Warning

The Kubernetes service does not support HTTP-level load balancing and cookie-based session affinity. To support cookie-based session affinity, use HAProxy as the load balancer.

To use the ClusterIP service, follow these steps:

  1. Use the command kubectl get services to get a list of Kubernetes services. The output will look like this (the actual names may be different):

    NAME

    TYPE

    CLUSTER-IP

    EXTERNAL-IP

    PORT(S)

    AGE

    kubernetes

    ClusterIP

    10.96.0.1

    <none>

    443/TCP

    1d

    marklogic

    ClusterIP

    10.109.182.205

    <none>

    8000/TCP, 8001/TCP, 8002/TCP

    1d

    marklogic-headless

    ClusterIP

    None

    <none>

    7997/TCP,7998/TCP,7999/TCP,8000/

    TCP,8001/TCP,8002/TCP

    1d

  2. The service you are looking for ends with "marklogic" and CLUSTER-IP <> None. In the example above, marklogic is the service name for the ClusterIP service. The row is shown in bold.

Additional ports

When you create a new application server on MarkLogic, you must add the new server port to additionalPorts in the service configuration:

## @param service.additionalPorts. Additional ports exposed at the service level.
  ## Example:
  ## - name: app1
  ##   port: 8010 
  ##   targetPort: 8010
  ##   protocol: TCP
  additionalPorts:
    - name: app-server1
      port: 8010
      targetPort: 8010
      protocol: TCP

Use the DNS record

For each Kubernetes ClusterIP service, a DNS with this format is created:

<service-name>.<namespace-name>.svc.cluster.local

For example, if the service-name is marklogic and the namespace-name is default, the DNS URL to access the MarkLogic cluster is marklogic.default.svc.cluster.local

Because StatefulSet is used for the MarkLogic deployment, the DNS for individual pods is created based on the headless service:

<pod-name>.<headless-service-name>.<namespace-name>.svc.cluster.local

For example, if the pod name is marklogic-0, then the headless service name is marklogic-headless and the namespace-name is default. The DNS URL to access the marklogic-0 pod is marklogic-0.marklogic.default.svc.cluster.local.

The DNS name can be used to access a MarkLogic cluster or an individual pod if your applications are deployed in the same Kubernetes cluster.

Use the port-forward command

Use the kubectl port-forward command to access MarkLogic outside of the Kubernetes cluster. Use it to access either a specific pod or the whole cluster.

Forward to pod

To access each pod directly, use the kubectl port-forward command with this format:

kubectl port-forward <POD-NAME> <LOCAL-PORT>: <CONTAINER-PORT> -n <release-namespace>

For example, enter this command to forward port 8000 from the MarkLogic service to localhost:

kubectl port-forward svc/marklogic 8000:8001 -n <release-namespace>

This pod can now be accessed from http://localhost:8001.

Forward to service

To access the whole cluster, use the kubectl port-forward command with this format:

kubectl port-forward svc/<SERVICE-NAME><LOCAL-PORT>:<CONTAINER-PORT> -n <release-namespace>

For example, enter this command to forward ports 8000 from the MarkLogic service to localhost:

kubectl port-forward svc/marklogic 8000:8000 -n <release-namespace>

 

This pod can now be accessed via http://localhost:8001.

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