ArgoCD

Pre-requisites

• Helm
• Kubectl

brew install helm
brew install kubectl

CleanUp

You may want to delete old resources
Follow up after this steps

kubectl delete crd alertmanagerconfigs.monitoring.coreos.com
kubectl delete crd alertmanagers.monitoring.coreos.com
kubectl delete crd podmonitors.monitoring.coreos.com
kubectl delete crd probes.monitoring.coreos.com
kubectl delete crd prometheuses.monitoring.coreos.com
kubectl delete crd prometheusrules.monitoring.coreos.com
kubectl delete crd servicemonitors.monitoring.coreos.com
kubectl delete crd thanosrulers.monitoring.coreos.com
kubectl delete crd applications.argoproj.io
kubectl delete crd applicationsets.argoproj.io
kubectl delete crd appprojects.argoproj.io
helm del -n argocd argocd

Installation

We will install the argoCD via Helm
We choose this argoCD distribution
The helm chart can be found here

We would like to expose two sets of Argo CD metrics
Therefore, we will enable:

• Application Metrics : controller.metrics.enabled=true
• API Server Metrics : server.metrics.enabled=true

Let's install:

kubectl create namespace argocd
helm repo add argo https://argoproj.github.io/argo-helm
helm upgrade -i argocd --namespace argocd --set redis.exporter.enabled=true --set redis.metrics.enabled=true --set server.metrics.enabled=true --set controller.metrics.enabled=true argo/argo-cd

Get the credentials

Username: admin

kubectl -n argocd get secret argocd-initial-admin-secret -o jsonpath="{.data.password}" | base64 -d

Connect our main repository to argoCD

The Application CRD is the Kubernetes resource object representing a deployed application instance in an environment
Let's apply it:

cat <<EOF | kubectl apply -f -
apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: workshop
  namespace: argocd
spec:
  destination:
    namespace: argocd
    server: https://kubernetes.default.svc
  project: default
  source:
    path: argoCD/
    repoURL: https://github.com/naturalett/continuous-delivery
    targetRevision: main
  syncPolicy:
    automated:
      prune: true
      selfHeal: true
EOF

Access the server UI

kubectl port-forward service/argocd-server -n argocd 8080:443

Connect: http://localhost:8080

Prometheus (Automatic Workflow - Just read and watch the installation)

Install Prometheus using argoCD

We will install the full stack: kube-prometheus-stack

The full stack will come with:

• Prometheus
• Grafana dashboard
• etc

We will disable the default node-exporter and we will add its helm chart separately

We are using Option 2

Option 1 - Apply the CRD

cat <<EOF | kubectl apply -f -
apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: prometheus
  namespace: argocd
spec:
  destination:
    name: in-cluster
    namespace: argocd
  project: default
  source:
    repoURL: https://prometheus-community.github.io/helm-charts
    targetRevision: 44.3.0
    chart: kube-prometheus-stack
EOF

Option 2 - Define the installation declaratively

This option is already applied based on CRD that we deployed earlier
You can check the Application YAML

Prometheus expose metrics to /metrics. In Grafana we will define a Prometheus data source. In addition, we have more metrics that we want to display in Grafana therefore we will scrape them in Prometheus

Prometheus Node Exporter

The application is defined declaratively

Prometheus Operator CRDs

Related issue: Fix prometheus CRD being too big #4439

We deployed a Prometheus CRDs

Access the server UI

kubectl port-forward service/kube-prometheus-stack-prometheus -n argocd 9090:9090

Connect: http://localhost:9090

Grafana

Get Grafana password

Username: admin

kubectl get secret -n argocd kube-prometheus-stack-grafana -o jsonpath="{.data.admin-password}" | base64 --decode ; echo

Access the server UI

kubectl port-forward service/kube-prometheus-stack-grafana -n argocd 9092:80

Grafana Dashboard

For dashboard we created a configMap and applied it with using the kustomization then we attached it during the deployment of Grafana
As well, we scrap the metrics that got exposed by the argoCD

Connect: http://localhost:9092

Fire up an Alert

Run the following script:

https://github.com/naturalett/continuous-delivery/blob/main/trigger_alert.sh

Access the server UI

kubectl port-forward service/alertmanager-operated -n argocd 9093:9093

Connect: http://localhost:9093

Watch the alert:

kubectl port-forward service/alertmanager-operated 9093:9093