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Chapter 1. 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.

1.1. Installing an Argo CD instance
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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 list and click the Argo CD tab.

  5. Click Create ArgoCD to configure the parameters:

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

1.2. Enabling replicas for Argo CD server and repo server
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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
    Copy to Clipboard Toggle word wrap

1.3. Deploying resources to a different namespace
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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=<namespace>
    1
    Copy to Clipboard Toggle word wrap
    1
    The namespace where Argo CD is installed.
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