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Preparing to install Red Hat OpenShift GitOps

Read the following information about sizing requirements and prerequisites before you install Red Hat OpenShift GitOps on OpenShift Container Platform. Sizing requirements also provides the sizing details for the default ArgoCD instance that is instantiated by the Red Hat OpenShift GitOps Operator.

Sizing requirements for GitOps

Red Hat OpenShift GitOps is a declarative way to implement continuous deployment for cloud-native applications. Through GitOps, you can define and configure the CPU and memory requirements of your application.

Every time you install the Red Hat OpenShift GitOps Operator, the resources on the namespace are installed within the defined limits. If the default installation does not set any limits or requests, the Operator fails within the namespace with quotas. Without enough resources, the cluster cannot schedule ArgoCD related pods. The following table details the resource requests and limits for the default workloads:

Workload CPU requests CPU limits Memory requests Memory limits

argocd-application-controller

1

2

1024M

2048M

applicationset-controller

1

2

512M

1024M

argocd-server

0.125

0.5

128M

256M

argocd-repo-server

0.5

1

256M

1024M

argocd-redis

0.25

0.5

128M

256M

argocd-dex

0.25

0.5

128M

256M

HAProxy

0.25

0.5

128M

256M

Optionally, you can also use the ArgoCD custom resource with the oc command to see the specifics and modify them:

oc edit argocd <name of argo cd> -n namespace

Sizing requirements for argocd-redis

During the capacity planning stage for your application in the Red Hat OpenShift GitOps Operator, you must ensure that an adequate amount of resources, such as memory, CPU, and storage, are allocated for the argocd-redis pod.

The default memory limit for the Redis pod might not be enough to manage a large number of resources. In these instances, you must increase the memory limit, monitor the memory metrics, and change the memory configuration while the application deployment scales up.

The following command shows the example of the memory configuration for a Redis pod in the openshift-gitops namespace:

$ oc get argocd -n openshift-gitops openshift-gitops -o json | jq '.spec.redis.resources'
Example Output
{
    "limits": { (1)
        "cpu": "500m",
        "memory": "256Mi"
  },
  "requests": { (2)
    "cpu": "250m",
    "memory": "128Mi"
  }
}
1 The highest resource limit threshold allocated to the pod.
2 The lowest resource limit threshold allocated to the pod.

The following example command changes the memory configuration for a Redis pod. The highest resource limit threshold is set to 8 GiB and the lowest is set to 256 MiB.

$ oc patch argocd -n openshift-gitops openshift-gitops --type json -p '[{"op": "replace", "path":  \
  "/spec/redis/resources/limits/memory", "value": "8Gi"}, {"op": "replace", "path": \
  "/spec/redis/resources/requests/memory", "value": "256Mi"}]'
Example Output
argocd.argoproj.io/openshift-gitops patched