Day #25 - Argo CD - Kubernetes GitOps Made Simple

Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes.

???????? ?????simplifies Kubernetes application deployments by automating synchronization with Git, providing robust disaster recovery, and ensuring consistency and visibility across clusters.

- By adopting GitOps principles with Argo CD, teams can achieve greater efficiency, security, and reliability in their DevOps workflows.

- GitOps is a methodology for managing software infrastructure and deployments using Git as the single source of truth.

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?????? ???? ?????? ???????????? ???? ??????????:?All configuration files, including deployments, services, secrets, etc., are stored in a Git repository.

?????????????????? ??????????????????: Tools like Argo CD and Flux detect changes in the Git repository and automatically apply them to the Kubernetes cluster. This ensures that the live infrastructure aligns with the desired state defined in Git.

???????????????????? ????????????????????:?Any changes made in the Git repository are automatically reflected in the Kubernetes cluster, enabling continuous deployment.

? ???????????? ???????? ???? (???????????? ????????????????????):?

? Applications were deployed manually using tools like kubectl, Helm, etc.

? For Kubernetes clusters, configurations like RBAC had to be manually managed. For EKS, IAM credentials were required.

? Challenges:

1. No graphical user interface (GUI) to track deployment status.
2. Increased risk of human error and security vulnerabilities.
3. Reliance on third-party tools.

???????????????????? ???? ?????????? ???????? ????:?

1. Automated State Reconciliation:

- Argo CD ensures that the live cluster state matches the desired state defined in Git.

- Manual changes made directly to the cluster using kubectl are rejected, ensuring consistency.

2. Change Tracking:

- Changes made in Git (e.g., increasing replicas) are automatically applied to the cluster.

- Maintains a detailed history of changes for audit and review.

3. Rollback Capability:

- Easy rollback to previous configurations using Git history if issues arise.

4. Disaster Recovery:

- If the cluster is deleted or affected by network issues, configurations stored in Git can be reapplied to restore the cluster.

What is Argo CD?

Argo CD is a Kubernetes-native continuous deployment tool. Unlike external CD tools that only enable push-based deployments, Argo CD can pull updated code from Git repositories and deploy it directly to Kubernetes resources. It enables developers to manage both infrastructure configuration and application updates in one system.

Argo CD offers the following key features and capabilities:

• Manual or automatic deployment of applications to a Kubernetes cluster.
• Automatic synchronization of application state to the current version of declarative configuration.
• Web user interface and command-line interface (CLI).
• Ability to visualize deployment issues, detect and remediate configuration drift.
• Role-based access control (RBAC) enabling multi-cluster management.
• Single sign-on (SSO) with providers such as GitLab, GitHub, Microsoft, OAuth2, OIDC, LinkedIn, LDAP, and SAML 2.0
• Support for webhooks triggering actions in GitLab, GitHub, and BitBucket.