Configuring internal and external agents

2 minute readReference

CloudBees CD/RO installation on Kubernetes uses internal services within the cluster to communicate between components, which ensures that communication within the cluster is efficient and secure. A common method for deploying CloudBees CD/RO on Kubernetes is to install CloudBees CD/RO components inside the Kubernetes cluster while installing worker agents such as deployment targets outside the cluster, such as on VMs and traditional platforms.

k8s topology external agents

In a mixed inside and outside deployment use case, communications with the CloudBees CD/RO components happen with internal services installed on Kubernetes, while communication with CD agents happen outside the cluster. These external agents can communicate with the internal components using a pair of gateway agents.

Gateway agent pairs can be installed using one of these methods:

  • Using the CloudBees CD/RO Helm chart

  • Using the CloudBees CD/RO agent Helm chart

Installing gateway agent pairs using the CloudBees CD/RO Helm chart

  1. Enable both internalGatewayAgent and externalGatewayAgent to enable the CloudBees CD/RO chart to install the agent sub-chart as gateway agents. Make sure you set and externalGatewayAgent.service.publicHostName both as the same value:

      enabled: true
      enabled: true
  2. Ensure your default values file has nginx-ingress (Kubernetes versions 1.21 and earlier) or ingress-nginx (Kubernetes versions 1.22 and later) tcp config map settings uncommented, to expose the 7800 gateway agents service:

    nginx-ingress or ingress-nginx:
        8200: "{{ .Release.Namespace }}/flow-repository:8200"
        8443: "{{ .Release.Namespace }}/flow-server:8443"
        7800: "{{ .Release.Namespace }}/gateway-external-agent-flow-agents:7800"
  3. If you are not creating an ingress controller as part of the CloudBees CD/RO chart because you already have an existing ingress controller make sure you have tcpconfig map added to expose above ports and services (for more details, refer to the Kubernetes documentation):

helm repo add cloudbees
helm repo update
helm install releaseName cloudbees/cloudbees-flow \
          -f valuesFile --namespace nameSpace --timeout 10000s

Installing gateway agents using the CloudBees CD/RO agent Helm chart

To create the gateway agent using the agent chart:

  1. Create the server secret:

    # Flow server credentials to use in order to register
    # with agent as a resource on the Flow server.
    kubectl create secret generic flow-agent-secret \
     --from-literal=CBF_SERVER_USER='admin' \
     --from-literal=CBF_SERVER_PASSWORD=<flow-server-password> \
     -n <namespace>
  2. Create a values file for the internal agent called gateway-default-agent.yaml:

    resourceName: gateway-default-agent
    replicas: 1
      existingSecret: flow-agent-secret
      publicHostName: gateway-default-agent-flow-agents
  3. Install the gateway internal agent using gateway-default-agent.yaml:

    helm install gateway-default-agent cloudbees/cloudbees-flow-agent \
    -f gateway-default-agent.yaml -n <namespace>
  4. Create a values file for the external agent called gateway-external-agent.yaml that adds zoneName, publicHostName and gateway configuration:

    resourceName: gateway-external-agent
    zoneName: external
      # External DNS hostname that the external agents would use to communicate
      # with the external gateway agent
    # configure gateway using external gateway agent
      # configure gateway using this agent
      enabled: true
      # Name of the gateway to create
      name: external
      # Name of gateway agent to pair with as gateway resource 2
      pairedResourceName: gateway-default-agent
      existingSecret: flow-agent-secret
  5. Install the gateway external agent using gateway-external-agent.yaml:

    helm install gateway-external-agent cloudbees/cloudbees-flow-agent \
    -f gateway-external-agent.yaml -n <namespace>