Xnett.org https://xnett.org Linux, infrastructure, automation, containers and AI/GPU notes from a Linux engineer. en LayerSmith: a self-hosted container image builder https://xnett.org/containers/layersmith-container-image-builder-llm-training https://xnett.org/containers/layersmith-container-image-builder-llm-training Fri, 02 Oct 2026 19:46:44 GMT Build container images with Docker or Podman, export them for air-gapped systems, and prepare LLM training environments with the new LayerSmith templates. What runs in my homelab containers https://xnett.org/containers/what-runs-in-my-homelab-containers https://xnett.org/containers/what-runs-in-my-homelab-containers Tue, 29 Sep 2026 20:48:47 GMT Home Assistant, Frigate, Jellyfin, Sonarr, Nextcloud, Open WebUI and an active/active Ops Center: the services on my two Docker hosts and the rules I run them by. Proxmox cluster: two mismatched nodes and a quorum lesson https://xnett.org/homelab/proxmox-cluster-two-nodes-and-a-quorum-lesson https://xnett.org/homelab/proxmox-cluster-two-nodes-and-a-quorum-lesson Tue, 29 Sep 2026 20:48:47 GMT Running a Proxmox VE cluster on an i7-4790K and a 4-thread mini PC: cloud-init VMs, local LVM, NFS backups, a witness VM for quorum and why CPU overcommit hit DNS first. The homelab network: UniFi from gateway to access points https://xnett.org/infrastructure/homelab-network-unifi-from-gateway-to-access-points https://xnett.org/infrastructure/homelab-network-unifi-from-gateway-to-access-points Tue, 29 Sep 2026 20:48:47 GMT A UniFi gateway, four switches and four access points, an LACP bond into Proxmox, VLAN-aware bridges, two Pi-holes and the Wi-Fi fixes that actually mattered. My homelab, top to bottom https://xnett.org/homelab/my-homelab-top-to-bottom https://xnett.org/homelab/my-homelab-top-to-bottom Tue, 29 Sep 2026 20:48:46 GMT Two Proxmox nodes, two Docker hosts, a NAS, UniFi from gateway to access points and one GPU laptop: how my homelab is built and what runs where. Ops Center gets MCP: connect AI agents with access control https://xnett.org/ai-gpu/ops-center-mcp-ai-agents-access-control https://xnett.org/ai-gpu/ops-center-mcp-ai-agents-access-control Sun, 13 Sep 2026 13:40:14 GMT Connect compatible AI clients to 113 Ops Center tools, with explicit permissions, expiring access and human approval of changes. Traffic Map in Ops Center: live observations with useful history https://xnett.org/infrastructure/ops-center-traffic-map-live-history https://xnett.org/infrastructure/ops-center-traffic-map-live-history Sun, 13 Sep 2026 13:40:13 GMT Follow traffic observations across your services, filter by source and investigate historical activity without relying on a live map alone. Authentication alerts in Ops Center: distinguish logins from web traffic https://xnett.org/infrastructure/ops-center-authentication-alerts-trusted-origins https://xnett.org/infrastructure/ops-center-authentication-alerts-trusted-origins Sun, 13 Sep 2026 13:40:12 GMT Review application logins, SSH authentication and WireGuard handshakes with explicit trust rules and optional Nextcloud Talk alerts. Ops Center as a PWA: an app window for mobile and wallboards https://xnett.org/homelab/ops-center-pwa-mobile-wallboards https://xnett.org/homelab/ops-center-pwa-mobile-wallboards Sun, 13 Sep 2026 13:40:11 GMT Install Ops Center on supported devices, keep the normal browser interface and use clear offline states instead of stale operational data. Ops Center agent collaboration: shared investigations, private boards and budgets https://xnett.org/ai-gpu/ops-center-agent-collaboration-memory https://xnett.org/ai-gpu/ops-center-agent-collaboration-memory Sun, 13 Sep 2026 13:40:10 GMT Let selected specialist agents investigate together on an owner-private board, with diagnostic tools, explicit budgets and stop controls. Managed disk expansion in Ops Center: one approved request from VM to filesystem https://xnett.org/automation/ops-center-managed-lvm-disk-expansion https://xnett.org/automation/ops-center-managed-lvm-disk-expansion Sun, 13 Sep 2026 13:40:09 GMT Preview and approve supported LVM growth, including verified Proxmox backing-disk expansion, with capacity checks and resumable requests. Ops Center beyond one homelab: portable setup and explicit integrations https://xnett.org/homelab/ops-center-portable-installation-integrations https://xnett.org/homelab/ops-center-portable-installation-integrations Sun, 13 Sep 2026 13:40:08 GMT Configure your own hosts, monitoring sources and integrations, keep runtime secrets separate, and plan upgrades with the documented migration requirements. Building My Own Ops Center – A Homelab Project for Linux, Automation, Security and AI https://xnett.org/homelab/building-ops-center-linux-automation-ai-homelab https://xnett.org/homelab/building-ops-center-linux-automation-ai-homelab Tue, 08 Sep 2026 08:25:01 GMT I built my own Ops Center as a homelab learning project, combining Linux operations, Ansible automation, Docker management, security intelligence, observability, high availability and AI agents into a single platform. NVIDIA Container Toolkit version pinning note https://xnett.org/notes/cuda-driver-container-toolkit-note https://xnett.org/notes/cuda-driver-container-toolkit-note Mon, 07 Sep 2026 21:54:12 GMT An unattended `dnf update` bumped the NVIDIA driver without touching `nvidia-container-toolkit`, and GPU containers started failing with "CUDA driver version is insufficient for CUDA runtime version" Interesting project: NetBird for mesh WireGuard https://xnett.org/notes/interesting-project-netbird https://xnett.org/notes/interesting-project-netbird Mon, 07 Sep 2026 21:54:12 GMT A self-hosted WireGuard mesh with ACLs and SSO baked in. Worth a look if you want Tailscale-style mesh networking without depending on someone else's control plane — good fit for a homelab or a small Troubleshooting: systemd unit refuses to restart https://xnett.org/notes/systemd-unit-wont-restart https://xnett.org/notes/systemd-unit-wont-restart Mon, 07 Sep 2026 21:54:12 GMT Symptom: `systemctl restart myservice` does nothing, and `systemctl status` shows "start request repeated too quickly, refusing to start." Cause: `StartLimitIntervalSec`/`StartLimitBurst` (defaults o Quick command: find the largest files under a path https://xnett.org/notes/quick-command-find-large-files https://xnett.org/notes/quick-command-find-large-files Mon, 07 Sep 2026 21:54:12 GMT ```bash du -ahx . | sort -rh | head -n 20 ``` The `-x` flag matters more than it looks — without it, `du` will happily walk into other mounted filesystems and give you a misleading picture of what's RHEL 10.2 release notes: what actually matters https://xnett.org/notes/rhel-10-2-release-notes https://xnett.org/notes/rhel-10-2-release-notes Mon, 07 Sep 2026 21:54:12 GMT Skimmed the changelog so you don't have to. The headline items worth caring about operationally: - Kernel bump with updated NVMe and network driver fixes — worth a scheduled reboot pass. - SELinux po Things I've learned managing Linux infrastructure https://xnett.org/linux/things-ive-learned-managing-linux-infrastructure https://xnett.org/linux/things-ive-learned-managing-linux-infrastructure Mon, 07 Sep 2026 21:54:12 GMT Practical lessons, troubleshooting notes and solutions collected from real-world Linux environments. Building a production-ready Linux Docker host https://xnett.org/containers/building-a-production-ready-linux-docker-host https://xnett.org/containers/building-a-production-ready-linux-docker-host Mon, 07 Sep 2026 21:54:12 GMT Building a Linux container platform with Docker, networking, reverse proxy, monitoring and backup. Running AI workloads on NVIDIA GPUs https://xnett.org/ai-gpu/running-ai-workloads-on-nvidia-gpus https://xnett.org/ai-gpu/running-ai-workloads-on-nvidia-gpus Mon, 07 Sep 2026 21:54:12 GMT Experiments and practical notes about GPU compute, NVIDIA drivers, CUDA, containers and AI workloads.