As a DevOps engineer working with Amazon Elastic Kubernetes Service (EKS), it's important to have clear and accurate diagrams and documentation to ensure smooth communication, deployment, and management of your infrastructure.
Here are some key elements you would care to see in diagrams and documentation:

Cluster architecture: Provide a high-level overview of the EKS cluster, including control plane components (API server, etcd, etc.), worker nodes, and node groups.
VPC and networking: Include details about the VPC configuration, subnets, security groups, NAT gateways, and any load balancers used for ingress and egress traffic.
Node groups and instance types: Detail the different node groups, including instance types, sizes, and the Auto Scaling configuration for each group.
Storage: Document the storage classes, persistent volume claims, and underlying storage services used (e.g., Amazon EBS, EFS, or S3).
Authentication and authorization: Describe how your cluster is configured for user authentication (e.g., IAM roles, OIDC providers) and authorization (e.g., RBAC policies).
Networking policies: Include any network policies applied to the cluster, such as pod-to-pod communication restrictions, ingress rules, and egress rules.
Ingress and egress controllers: Show how traffic is managed in and out of the cluster, including any ingress controllers (e.g., ALB, Nginx) and egress controllers (e.g., Egress Gateway).
Monitoring and logging: Detail the monitoring and logging tools and services used, such as Amazon CloudWatch, Prometheus, Grafana, Fluentd, and Elasticsearch.
CI/CD pipeline: Illustrate your CI/CD pipeline, including code repositories, build systems, deployment strategies, and integration with EKS.
Add-ons and third-party integrations: List any additional components, tools, or services integrated into your EKS cluster, such as service mesh (e.g., Istio, AWS App Mesh), security tools (e.g., Twistlock, Calico), and container registries.
Disaster recovery and backup: Document your backup and disaster recovery strategies, including backup schedules, recovery objectives, and any cross-region replication setup.
Versioning and upgrade processes: Describe your processes for keeping the EKS control plane and worker nodes up-to-date, including any best practices, testing, and rollback strategies.
Security best practices: Highlight the security measures and best practices implemented in the cluster, such as pod security policies, encryption, and secrets management.
When creating diagrams, use a clear visual hierarchy and consistent labeling to make them easy to understand.
In your documentation, provide sufficient context and explanation to help your team and other stakeholders effectively work with your EKS cluster.
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