# Tech Infrastructure: CARE

## Infrastructure Requirements

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**High Availability Kubernetes Cluster:**

* Implement a multi-master Kubernetes cluster with at least three master nodes to ensure high availability and fault tolerance.
* Deploy worker nodes across multiple geo-locations to avoid single points of failure.

**Persistent Storage:**

* Set up dynamic storage provisioning using custom storage classes and external storage solutions.
* Implement data replication and backup strategies for critical application data, ensuring data integrity and availability.

**S3-Compatible Object Storage:**

* S3-compatible object storage solution with high availability and scalability features.
* Configure data lifecycle policies for object versioning, retention, and automatic deletion, requiring careful data management.
* Enforce encryption at rest and in transit for all stored objects.
* Implement fine-grained access control using bucket policies, IAM roles, and access keys, ensuring only authorized users and applications can access the stored data.

**Auto-Scaling:**

* Implement custom Horizontal Pod Autoscalers (HPAs) with custom metrics. Set up Cluster Autoscaler to dynamically adjust the number of worker nodes based on resource utilization.

**Security Policies and Network Policies:**

* Enforce strict security policies, including PodSecurityPolicies and Network Policies, to control and isolate pods and services.

**Custom Ingress Controllers:**

* Implement custom Ingress controllers for routing and traffic management, including features like header rewriting, SSL termination, and authentication.

**Advanced Networking:**

* Configure a custom CNI (Container Network Interface) plugin with strict network policies to enforce micro-segmentation for maximum security.
* Ability to create Network Policy resources to control ingress and egress traffic between pods, making network access more secure.

**Custom Resource Definitions (CRDs):**

* Support for Custom Resource Definition for adding ClusterIssuers for Letsencrypt Certificate Authority or other certificates manager.

**SMTP Server/Service:**

An SMTP email server to handle email traffic for the domain the Care application is running on.

**Role-Based Access Control (RBAC):**

* Enforce fine-grained RBAC policies, ensuring only authorized personnel can access and manage specific resources within the Kubernetes cluster.

**Centralized Logging and Error Detection:**

* Configure centralized logging with log aggregation and analysis using tools like Sentry.

**Secrets Management:**

* Utilize advanced secret management solutions like HashiCorp Vault or Kubernetes native Secrets Store CSI Driver for secure storage and distribution of sensitive data.

**Backup and Disaster Recovery:**

* Establish a backup and disaster recovery strategy, including off-site backups, data snapshots, and automated failover procedures.

**Compliance and Auditing:**

* Implement Kubernetes audit logging and maintain compliance with industry-specific standards (e.g., CIS Kubernetes Benchmarks) for on-premises deployments.

**Documentation and Training:**

* Exhaustive documentation, training materials, and runbooks for onboarding and maintaining the Kubernetes setup.

**Advanced Backup and Restore Procedures:**

* Implement procedures for backup and restoration of the entire Kubernetes cluster, including etcd data, to ensure data integrity during failures.<br>

**Database Cluster Setup:**

* Deploy a highly available database cluster (e.g., PostgreSQL, MySQL) with multiple read replicas for scalability and fault tolerance.

**Data Partitioning and Sharding:**

* Implement data partitioning and sharding strategies to distribute database load across nodes, requiring careful data modeling and management.

**Database Encryption:**

* Enforce encryption at rest and in transit for database data, utilizing advanced encryption methods and key management.

**Database Backups:**

* Configure automated database backup strategies with incremental and differential backups, ensuring data consistency and reliability.

**Automated Failover:**

* Set up automated failover mechanisms for the database cluster to minimize downtime in case of node failures.

**Database Maintenance Jobs:**

* To ensure database performance, schedule and manage maintenance jobs, such as index optimization, vacuuming, and data archiving.

**Database Security Policies:**

* Enforce strict database security policies, including role-based access control, audit logging, and database-level encryption.

**Database Replication Lag Monitoring:**

* Monitor and manage database replication lag to ensure data consistency across replicas, requiring timely intervention when lag exceeds thresholds.

**Database Version Upgrades:**

* Planned database version upgrades with minimal downtime.

**Database Scaling:**

* Implement auto-scaling policies for the database cluster, dynamically adjusting resources based on workload demand.

**Continuous Deployment (CD):**

* Set up continuous deployment to automatically promote successfully tested changes to production without manual intervention.

**Rollback Procedures:**

* Define rollback procedures and automate them in case of deployment failures or issues in production.

**Environment Configuration Management:**

* Manage environment-specific configurations and secrets separately from the application code.

**Monitoring and Alerting:**

* Track application performance and set up alerts for anomalies in deployments.

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