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MarkLogic Server on Kubernetes

HAProxy Ingress Controller configuration

The Ingress controller is exposed using NodePort and the --configmap-tcp-services functionality.

Service configuration

The HAProxy Ingress controller service is configured using this code:

apiVersion: v1
kind: Service
metadata:
  annotations:
    meta.helm.sh/release-name: haproxy
    meta.helm.sh/release-namespace: ingress
  labels:
    app.kubernetes.io/instance: haproxy
    app.kubernetes.io/managed-by: Helm
    app.kubernetes.io/name: kubernetes-ingress
    app.kubernetes.io/version: 1.8.3
    helm.sh/chart: kubernetes-ingress-1.22.4
  name: haproxy-kubernetes-ingress
  namespace: ingress
spec:
  clusterIP: 10.100.226.75
  clusterIPs:
  - 10.100.226.75
  externalTrafficPolicy: Cluster
  internalTrafficPolicy: Cluster
  ipFamilies:
  - IPv4
  ipFamilyPolicy: SingleStack
  ports:
  - name: http
    nodePort: 31080
    port: 80
    protocol: TCP
    targetPort: http
  - name: https
    nodePort: 31443
    port: 443
    protocol: TCP
    targetPort: https
  - name: stat
    nodePort: 31024
    port: 1024
    protocol: TCP
    targetPort: stat
  - name: ml-odbc-tcp
    nodePort: 31032
    port: 5432
    protocol: TCP
    targetPort: 5432
  - name: healthz-tcp
    nodePort: 31042
    port: 1042
    protocol: TCP
    targetPort: 1042
  selector:
    app.kubernetes.io/instance: haproxy
    app.kubernetes.io/name: kubernetes-ingress
  sessionAffinity: None
  type: NodePort
Code explanation

In the Service configuration, the ODBC code is:

 - name: ml-odbc-tcp
    nodePort: 31032
    port: 5432
    protocol: TCP
    targetPort: 5432

The port is exposed using nodePort: 31032.

configmap-tcp-services

To create a dedicated configmap:

apiVersion: v1
data:
  "5432": ml-lb/ml-enode-ml-lb:5432
kind: ConfigMap
metadata:
  annotations:
    kubectl.kubernetes.io/last-applied-configuration: |
      {"apiVersion":"v1","data":{"5432":"ml-lb/ml-enode-ml-lb:5432"},"kind":"ConfigMap","metadata":{"annotations":{},"labels":{"app.kubernetes.io/instance":"haproxy","app.kubernetes.io/name":"kubernetes-ingress"},"name":"ml-odbc-config","namespace":"ingress"}}
  labels:
    app.kubernetes.io/instance: haproxy
    app.kubernetes.io/name: kubernetes-ingress
  name: ml-odbc-config
  namespace: ingress
Code explanation

In configmap-tcp-services:

  • The configuration is typically done with this code:

    data:
"5432": ml-lb/ml-enode-ml-lb:5432

<ingress-tcp-sevice-port> : <tcp-service-to-be-exposed-namespace>/<tcp-service-name-to-be-exposed>

  • Port 5432 is exposed at the Ingress controller service level and the ML LB ODBC port is bound.

Ingress controller Helm Chart level

At the Ingress controller Helm Chart level, this was specified in the values.yaml file:

## Additional command line arguments to pass to Controller
## ref: https://github.com/haproxytech/kubernetes-ingress/blob/master/documentation/controller.md
extraArgs:
#  - --namespace-whitelist=default
#  - --namespace-whitelist=namespace1
#  - --namespace-blacklist=namespace2
  - --configmap-tcp-services=ingress/ml-odbc-config
  ## Additional tcp ports to expose
  ## This is especially useful for TCP services:
  ## https://github.com/haproxytech/kubernetes-ingress/blob/master/documentation/controller.md
  tcpPorts:
    - name: ml-odbc
      port: 5432
      targetPort: 5432
      nodePort: 31032
## Controller Service configuration
## ref: https://kubernetes.io/docs/concepts/services-networking/service/
service:
  enabled: true     # set to false when controller.kind is 'DaemonSet' and controller.daemonset.useHostPorts is true

  type: NodePort    # can be 'ClusterIP', 'NodePort' or 'LoadBalancer'
Code explanation

In the Ingress controller Helm Chart level:

  • extraArgs specifies which configmap is used. The tcp service syntax is:

    - --configmap-tcp-services=<configmap-namespace>/<configmap-name>

  • tcpPorts specifies the additional tcp ports exposed by the Ingress controller service.

  • The Ingress controller service is specified as NodePort.

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