How ArgoCD Works?

ArgoCD is an open-source GitOps continuous delivery tool that provides automated deployment of containerized applications to Kubernetes clusters. It automates the deployment process by continuously monitoring the Git repository and deploying the changes automatically to the Kubernetes cluster.

In this article, we will explore how ArgoCD works and how it can be used to deploy applications to Kubernetes clusters.

Table of Contents

1. Installation
2. Configuration
3. Application Deployment
4. Monitoring and Troubleshooting

Installation:

To install ArgoCD, follow the below steps:

1. Create a Kubernetes cluster.
2. Install the ArgoCD operator using the following command:

kubectl create namespace argocd
kubectl apply -n argocd -f https://raw.githubusercontent.com/argoproj/argo-cd/stable/manifests/install.yaml

3. Once the installation is complete, check the status of the ArgoCD pods using the following command:

kubectl get pods -n argocd

Configuration:

Once the installation is complete, you can configure ArgoCD by following the below steps:

1. Open the ArgoCD web UI using the following command:

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

2. Navigate to http://localhost:8080/ in your web browser to access the ArgoCD UI.
3. Log in using the default username and password: admin and the auto-generated password that can be retrieved using the following command:

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

4. Once logged in, you can configure ArgoCD by adding the Kubernetes cluster and Git repository details.

Application Deployment:

To deploy an application using ArgoCD, follow the below steps:

1. Create a Git repository containing your Kubernetes manifests.
2. Add the Git repository details to ArgoCD.
3. Create an application in ArgoCD using the following command:

argocd app create <APP-NAME> --repo <GIT-REPO-URL> --path <K8S-MANIFEST-PATH> --dest-server <K8S-SERVER> --dest-namespace <K8S-NAMESPACE>

4. ArgoCD will automatically deploy the application to the specified Kubernetes cluster.

Monitoring and Troubleshooting:

To monitor and troubleshoot ArgoCD, follow the below steps:

1. Check the application status in the ArgoCD UI.
2. View the ArgoCD logs using the following command:

kubectl logs -n argocd <POD-NAME>

3. Check the Kubernetes cluster logs for any errors using the following command:

kubectl logs -n <K8S-NAMESPACE> <POD-NAME>

ArgoCD is an excellent tool for automating the deployment process in Kubernetes clusters. With its user-friendly web UI and easy-to-use CLI, it simplifies the deployment process and reduces the risk of errors. It also provides various features for monitoring and troubleshooting the deployments, making it a reliable tool for any Kubernetes-based application deployment.

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That's it for this post. Keep practicing and have fun. Leave your comments if any.