HA Gateway Node (OCI)

The HA Gateway Node serves as the edge proxy and monitoring host for the cloud-hosted K3s cluster.

Role: Edge Proxy & Monitoring
Instance: utils-node-1 (Oracle Ampere A1)
OS: Ubuntu 22.04 Minimal (ARM64)

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1. Infrastructure Specifications

Instance resource allocation:

Component	Specification	Description
CPU	1 OCPU	Shared Ampere A1 resource
RAM	4 GB	Standard allocation
Storage	50 GB	Boot Volume
Network	Public IP	Secured via Tailscale

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2. Operational Roles

The node executes the following critical functions:

Edge Proxy (Nginx)

• Traffic Forwarding: Requests are routed to internal K3s services.

Monitoring (Prometheus/Grafana)

Cluster-wide observability is centralized on this node.

• Metric Aggregation: Data is collected from the K3s cluster.
• Visualization: Dashboards are provided via Grafana.

VPN Gateway (Tailscale)

Hybrid connectivity between OCI and Homelab is maintained.

• Subnet Routing: Facilitates cross-environment communication.
• Security: Encrypted point-to-point tunneling.

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3. Configuration and Maintenance

Operational standard procedures:

1. Updates: Weekly apt update and system patching are performed.
2. Security: Access is restricted to SSH Key authentication only.
3. Backups: Boot Volume backups are automated through OCI Backup Policies.