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Setting up an Argo CD instance

By default, the Red Hat OpenShift GitOps installs an instance of Argo CD in the openshift-gitops namespace with additional permissions for managing certain cluster-scoped resources. To manage cluster configurations or deploy applications, you can install and deploy a new Argo CD instance. By default, any new instance has permissions to manage resources only in the namespace where it is deployed.

Installing Argo CD

To manage cluster configurations or deploy applications, you can install and deploy a new Argo CD instance.

Procedure

  1. Log in to the OpenShift Container Platform web console.

  2. Click Operators → Installed Operators.

  3. Create or select the project where you want to install the Argo CD instance from the Project drop-down menu.

  4. Select OpenShift GitOps Operator from the installed operators and select the Argo CD tab.

  5. Click Create to configure the parameters:

    1. Enter the Name of the instance. By default, the Name is set to argocd.

    2. Create an external OS Route to access Argo CD server. Click Server → Route and check Enabled.

  6. To open the Argo CD web UI, click the route by navigating to Networking → Routes → <instance name>-server in the project where the Argo CD instance is installed.

Enabling replicas for Argo CD server and repo server

Argo CD-server and Argo CD-repo-server workloads are stateless. To better distribute your workloads among pods, you can increase the number of Argo CD-server and Argo CD-repo-server replicas. However, if a horizontal autoscaler is enabled on the Argo CD-server, it overrides the number of replicas you set.

Procedure

  • Set the replicas parameters for the repo and server spec to the number of replicas you want to run:

    Example Argo CD custom resource
    apiVersion: argoproj.io/v1alpha1
kind: ArgoCD
metadata:
  name: example-argocd
  labels:
    example: repo
spec:
  repo:
    replicas: <number_of_replicas>
  server:
    replicas: <number_of_replicas>
    route:
      enabled: true
      path: /
      tls:
        insecureEdgeTerminationPolicy: Redirect
        termination: passthrough
      wildcardPolicy: None

Deploying resources to a different namespace

To allow Argo CD to manage resources in other namespaces apart from where it is installed, configure the target namespace with a argocd.argoproj.io/managed-by label.

Procedure

  • Configure the namespace:

    $ oc label namespace <namespace> \
argocd.argoproj.io/managed-by=<instance_name> (1)
    1 The namespace where Argo CD is installed.

In a multi-tenant cluster, users might have to deal with multiple instances of Argo CD. For example, after installing an Argo CD instance in your namespace, you might find a different Argo CD instance attached to the Argo CD console link, instead of your own Argo CD instance, in the Console Application Launcher.

You can customize the Argo CD console link by setting the DISABLE_DEFAULT_ARGOCD_CONSOLELINK environment variable:

  • When you set DISABLE_DEFAULT_ARGOCD_CONSOLELINK to true, the Argo CD console link is permanently deleted.

  • When you set DISABLE_DEFAULT_ARGOCD_CONSOLELINK to false or use the default value, the Argo CD console link is temporarily deleted and visible again when the Argo CD route is reconciled.

Prerequisites

  • You have logged in to the OpenShift Container Platform cluster as an administrator.

  • You have installed the Red Hat OpenShift GitOps Operator.

Procedure

  1. In the Administrator perspective, navigate to Administration → CustomResourceDefinitions.

  2. Find the Subscription CRD and click to open it.

  3. Select the Instances tab and click the openshift-gitops-operator subscription.

  4. Select the YAML tab and make your customization:

    • To enable or disable the Argo CD console link, edit the value of DISABLE_DEFAULT_ARGOCD_CONSOLELINK as needed:

      apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata:
  name: openshift-gitops-operator
spec:
  config:
    env:
    - name: DISABLE_DEFAULT_ARGOCD_CONSOLELINK
      value: 'true'