4c532dbf97
t3.viktorbarzin.me went down 2026-07-02 15:42-16:35 UTC: an agent-spawned 12.3G ugrep plateaued inside t3-serve@wizard's MemoryHigh(12G)..MemoryMax(16G) band. With MemorySwapMax=0 its anon pages were unreclaimable, so the kernel throttled every task in the cgroup indefinitely (memory.pressure full ~80%, oom_kill never fired) - the t3 event loop starved, the accept queue rotted, and the terminal was dead until the hog was SIGKILLed by hand. The 2026-06-22 design assumed 'throttle to a crawl, then OOM locally'; a hog that stabilises between high and max never OOMs, so the throttle band is a livelock zone, not a safety layer. Viktor asked to close that gap: MemoryHigh is now explicitly infinity on all three work cgroup definitions (t3-serve@ unit, user-<uid>.slice drop-in, docker.slice) so a runaway is cgroup-OOM- killed at MemoryMax immediately - OOMPolicy=continue already keeps the t3 server alive when a child dies. MemoryMax/MemorySwapMax=0/earlyoom unchanged. Applied live to the devvm the same day (daemon-reload + runtime set-property on running cgroups, no session restarts). Post-mortem addendum + runbook updated in the same commit. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> |
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Infrastructure Documentation
This repository contains the configuration and documentation for a homelab Kubernetes cluster running on Proxmox. The infrastructure hosts 70+ services managed declaratively with Terraform and Terragrunt.
Quick Reference
Network Ranges
- Physical Network:
192.168.1.0/24- Physical devices and host network - Management VLAN 10:
10.0.10.0/24- Infrastructure VMs and management - Kubernetes VLAN 20:
10.0.20.0/24- Kubernetes cluster network
Key URLs
- Public:
viktorbarzin.me - Internal:
viktorbarzin.lan
Architecture Documentation
| Document | Description |
|---|---|
| Overview | Infrastructure overview, hardware specs, VM inventory, and service catalog |
| Networking | Network topology, VLANs, routing, and firewall rules |
| VPN | Headscale mesh VPN and Cloudflare Tunnel configuration |
| Storage | Proxmox host NFS, Proxmox CSI (LVM-thin + LUKS2), and persistent volume management |
| Authentication | Authentik SSO, OIDC flows, and service integration |
| Security | CrowdSec IPS, Kyverno policies, and security controls |
| Monitoring | Prometheus, Grafana, Loki, and observability stack |
| Secrets Management | HashiCorp Vault integration and secret rotation |
| CI/CD | Woodpecker CI pipeline and deployment automation |
| Backup & DR | Backup strategy, disaster recovery, and restore procedures |
| Compute | Proxmox VMs, GPU passthrough, K8s resource management, and VPA |
| Databases | PostgreSQL, MySQL, Redis, and database operators |
| Multi-tenancy | Namespace isolation, tier system, and resource quotas |
Operations
- Runbooks - Step-by-step operational procedures
- Plans - Infrastructure change plans and rollout strategies
Getting Started
- Review the Overview for a high-level understanding
- Read the Networking doc to understand connectivity
- Check Compute for resource management patterns
- Explore individual architecture docs based on your area of interest