Argo CD is a declarative, GitOps continuous delivery tool that helps in managing and deploying applications to Kubernetes clusters. It automates the deployment process by ensuring that the state of the cluster matches the desired state defined in a Git repository.
This article will explain how to use Argo CD to deploy applications to Kubernetes.
Prerequisites:Before getting started with Argo CD, you must have a basic understanding of Kubernetes and Git.
Argo CD can be installed on Kubernetes using either a YAML manifest file or a Helm chart. The recommended way to install Argo CD is by using the Helm chart. To install Argo CD using Helm, run the following commands:
- Installing Argo CD:
helm repo add argo https://argoproj.github.io/argo-helm
helm install argocd argo/argo-cd --version X.X.X --namespace argocd
X.X.X with the latest version number.
After the installation is complete, you can access the Argo CD UI by running the following command:
- Accessing Argo CD UI:
kubectl port-forward svc/argocd-server -n argocd 8080:443
This command will create a tunnel to the Argo CD server and expose it on port 8080. You can access the Argo CD UI by navigating to
https://localhost:8080 in your web browser.
To add an application to Argo CD, you need to create a YAML manifest file that defines the desired state of the application. This manifest file should be stored in a Git repository that Argo CD can access.
- Adding an Application:
Here's an example manifest file for a simple Kubernetes deployment:
- name: nginx
- containerPort: 80
To add this application to Argo CD, run the following command:
argocd app create nginx --repo <GIT_REPO_URL> --path <PATH_TO_MANIFEST_FILE> --dest-server https://kubernetes.default.svc --dest-namespace default
<GIT_REPO_URL> with the URL of your Git repository and
<PATH_TO_MANIFEST_FILE> with the path to your manifest file within the repository.
To deploy an application using Argo CD, you need to sync the application with the desired state defined in the Git repository. You can do this by running the following command:
- Deploying an Application:
argocd app sync nginx
This command will compare the current state of the application in the cluster with the desired state defined in the Git repository and make any necessary changes to ensure that they match.
Argo CD provides a comprehensive UI for monitoring the state of applications in the cluster. You can access the UI by navigating to
- Monitoring Application:
https://localhost:8080/applicationsin your web browser.
Argo CD is an excellent tool for managing and deploying applications to Kubernetes clusters. It provides a simple and efficient way to automate the deployment process using GitOps principles. With this guide, you should be able to get started with Argo CD and deploy your applications to Kubernetes with ease.
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That's it for this post. Keep practicing and have fun. Leave your comments if any.