tags on Wael Nasreddine

Qubes OS

Thu, 14 Nov 2024 00:00:00 +0000

Notes on high-security computing using Xen-based compartmentalization.

🔐 Architecture Link to heading

Dom0: The admin domain and attack surface reduction.
Templates: Fedora/Debian template management and updates.
AppVMs: Disposable and persistent domain usage.

⚙️ Configuration Link to heading

Qubes RPC (qrexec): Policy definitions for inter-VM communication.
Networking: sys-net and sys-firewall chaining.
Hardware: USB handling and device isolation.

📚 External Resources Link to heading

Qubes OS Documentation - Security architecture and user guides.

NixOS

Sun, 24 Mar 2019 00:00:00 +0000

Documentation for declarative system management, reproducible builds, and the Nix package manager.

❄️ The Nix Philosophy Link to heading

Declarative Configuration: Managing state via configuration.nix rather than imperative commands.
Generations: Atomic upgrades and rollback capability.

📦 Ecosystem & Packages Link to heading

Flakes: Managing hermetic dependencies and project-specific environments.
Home Manager: Dotfile management and user-space configuration.
Nixpkgs: Package overlays and custom derivations.

📚 External Resources Link to heading

NixOS Manual - System configuration guide.
Nix Package Search - Searchable index of nixpkgs options.

Arista Networks

Mon, 01 Jan 0001 00:00:00 +0000

This section tracks configurations, automation scripts, and operational notes for Arista switching infrastructure running EOS (Extensible Operating System).

🎛 Core Architecture Link to heading

EOS: Notes on the state-sharing database (Sysdb) and process management.
CLI: Operational commands, aliases, and troubleshooting workflows.
CloudVision: Telemetry and management data.

🛠 Automation & NetDevOps Link to heading

AVD (Arista Validated Designs): CI/CD pipelines for network configuration.
eAPI: JSON-RPC interface usage.
Python/Ansible: Custom scripts for state manipulation.

📚 External Resources Link to heading

Arista EOS Central - Community forums and knowledge base.
Arista Product Documentation - Official configuration guides.

FortiGate

Mon, 01 Jan 0001 00:00:00 +0000

This section tracks configurations, hardening guides, and operational notes for the FortiGate firewall running FortiOS.

🛡 Core Security & Networking Link to heading

FortiOS: Policy management, NAT strategies, and SD-WAN routing logic.
Hardware Acceleration: Notes on ASIC offloading (NP/CP processors) for high throughput.
VPN: SSL-VPN and IPsec configurations for secure remote access.

🛠 Automation & IaC Link to heading

Terraform: Managing policies, address objects, and services via the FortiOS provider.
API: Interacting with the FortiOS REST API for state manipulation.

📚 External Resources Link to heading

Fortinet Document Library - Official administration guides.
FortiOS Terraform Provider - Provider documentation.

Home Assistant

Mon, 01 Jan 0001 00:00:00 +0000

Home Assistant Link to heading

This section documents the central home automation hub, covering entity management, dashboard design, and automation logic.

🎛 Core & Dashboards Link to heading

Lovelace: Dashboard YAML configuration, custom cards, and mobile views.
HACS: Managing custom integrations and frontend elements via the Community Store.
Integrations: Configuration of entities, sensors, and helpers.

🛠 Automation & Connectivity Link to heading

Logic: YAML-based automations, scripts, and Blueprints.
Protocols: Zigbee (ZHA/Zigbee2MQTT), Z-Wave JS, and Matter/Thread device pairing.
Node-RED: Flow-based visual programming for complex sequences.

📚 External Resources Link to heading

Home Assistant Documentation - Official configuration guide.
Blueprints Exchange - Community-shared automation templates.

Kubernetes

Mon, 01 Jan 0001 00:00:00 +0000

A central repository for container orchestration patterns, cluster architecture, and cloud-native tooling.

🏗 Cluster Engineering Link to heading

Control Plane: Etcd performance, API server tuning, and scheduler logic.
Distributions: Specific notes on Talos Linux and standard upstream K8s.
Networking (CNI): Cilium eBPF implementation, load balancing, and ingress strategies.

🚀 Workload Management Link to heading

GitOps: ArgoCD application sets and synchronization patterns.
Storage (CSI): Persistent volume management via TrueNAS (iSCSI/NFS) and local path provisioners.
Observability: Prometheus, Grafana, and Loki stack configurations.

📚 External Resources Link to heading

Kubernetes Documentation - The official source of truth.
CNCF Landscape - Cloud Native Computing Foundation ecosystem.

PostgreSQL

Mon, 01 Jan 0001 00:00:00 +0000

PostgreSQL Link to heading

This section documents database administration, performance tuning, and schema design for PostgreSQL clusters.

🎛 Core Administration Link to heading

Configuration: Tuning postgresql.conf (shared_buffers, work_mem) for hardware resources.
Maintenance: Vacuum strategies, index bloat management, and analyzing statistics.
Security: Role-based access control (RBAC), pg_hba.conf rules, and TLS encryption.

🛠 Operations & HA Link to heading

Replication: Streaming replication setup, logical replication, and failover management (Patroni/Repmgr).
Backup/Restore: Point-in-time recovery (PITR) using tools like pgBackRest or Barman.
Extensions: Management of extensions like PostGIS or pg_stat_statements.

📚 External Resources Link to heading

PostgreSQL Documentation - Official reference manual.
PGTune - Configuration calculator for hardware sizing.

ProxmoxVE

Mon, 01 Jan 0001 00:00:00 +0000

Management notes for the Type-1 hypervisor clusters, focusing on resource allocation and hardware abstraction.

🖥 Compute Resources Link to heading

Virtual Machines (KVM): CPU pinning, NUMA alignment, and PCIe passthrough.
LXC Containers: Lightweight system containers and privilege mapping.

💾 Infrastructure Link to heading

Storage Backends: LVM-Thin, ZFS, and shared storage integration.
Networking: Linux Bridges, OVS (Open vSwitch), and VLAN tagging.
High Availability: Cluster quorum, fencing, and replication.

📚 External Resources Link to heading

Proxmox VE Documentation - Reference manual.
Proxmox Wiki - Community guides and how-tos.

Redis

Mon, 01 Jan 0001 00:00:00 +0000

Redis Link to heading

This section documents the in-memory data structure store used for caching, message brokering, and high-performance databases.

🎛 Core Concepts Link to heading

Data Types: Usage patterns for Strings, Hashes, Lists, Sets, and Sorted Sets.
Persistence: Trade-offs between RDB (Snapshots) and AOF (Append Only File).
Memory Management: Eviction policies (volatile-lru, allkeys-lru) and maxmemory tuning.

🛠 Operations & HA Link to heading

High Availability: Sentinel configuration for automatic failover and monitoring.
Clustering: Sharding strategies and hash slot management for horizontal scaling.
CLI: Essential commands for debugging, latency monitoring, and real-time statistics.

📚 External Resources Link to heading

Redis Documentation - Official command reference and administration guides.
Redis University - Deep dive courses and architectural patterns.

SuperMicro

Mon, 01 Jan 0001 00:00:00 +0000

Documentation regarding bare metal server hardware, chassis management, and firmware maintenance.

🔌 Management (IPMI) Link to heading

BMC/IPMI: Remote management, sensor monitoring, and fan control thresholds.
Redfish API: Automating hardware states programmatically.

🛠 Hardware Components Link to heading

BIOS: Power management profiles, bifurcations, and boot orders.
Storage: Backplane compatibility, SAS expanders, and cabling.
Firmware: Update procedures for BIOS and BMC.

📚 External Resources Link to heading

SuperMicro Technical Support - Manuals and BIOS downloads.

Synology

Mon, 01 Jan 0001 00:00:00 +0000

Synology NAS Link to heading

This section tracks configurations for Synology DiskStation Manager (DSM), storage pools, and application packages.

🎛 Core Administration Link to heading

Storage Manager: SHR (Synology Hybrid RAID) vs. Standard RAID, scrubbing, and volume expansion.
DSM Config: Security Advisor, user/group permissions, and notification settings.
Network: Link Aggregation (Bonding), QuickConnect, and reverse proxy setup.

🛠 Services & Packages Link to heading

File Services: SMB/NFS advanced settings and Synology Drive Server for private cloud syncing.
Container Manager: Managing Docker containers and docker-compose stacks via the GUI.
Backup: Active Backup for Business strategies and Hyper Backup to external targets.

📚 External Resources Link to heading

Synology Knowledge Center - Official guides and white papers.
Synology Community - User forums and troubleshooting.

Talos

Mon, 01 Jan 0001 00:00:00 +0000

Talos Linux Link to heading

This section documents the management of Talos Linux, an immutable, API-driven operating system built specifically for Kubernetes.

🎛 Architecture & Config Link to heading

Immutability: Concepts behind the read-only file system and ephemeral state.
Machine Configs: Managing node configuration via YAML definitions and patches.
API Access: Interacting with nodes via gRPC endpoints rather than SSH.

🛠 Operations & CLI Link to heading

talosctl: Essential commands for bootstrapping, debugging, and the dashboard TUI.
Lifecycle: Workflows for safe OS version upgrades and configuration application.
Extensions: Managing system extensions (drivers/tools) via system extensions images.

📚 External Resources Link to heading

Talos Documentation - Official guides and API references.
Sidero Labs Extensions - Index of official system extensions.

TrueNAS

Mon, 01 Jan 0001 00:00:00 +0000

Management of centralized network-attached storage, focusing on TrueNAS Scale and Core.

📂 Storage Services Link to heading

Sharing Protocols: SMB, NFS export rules, and iSCSI target configuration.
Data Protection: Replication tasks, cloud sync, and scrub schedules.
Identity: ACLs, user groups, and directory services.

🧩 Application Layer Link to heading

Apps: Deployment of containerized services (Helm/Docker).
Virtualization: VM management on the storage appliance.

📚 External Resources Link to heading

TrueNAS Documentation Hub - Official guides for Core and Scale.

UniFi

Mon, 01 Jan 0001 00:00:00 +0000

UniFi Link to heading

This section tracks configurations for the Ubiquiti UniFi network stack, focusing on wireless optimization and site management.

🎛 Controller & Management Link to heading

Network Application: Hosting strategies (Self-hosted/Docker vs. Cloud Key) and backup routines.
Port Profiles: Managing VLAN tagging, trunking, and switch port isolation.
Security: Guest portal configuration, radius profiles, and MAC filtering.

🛠 Infrastructure & Tuning Link to heading

Wireless: Radio optimization, transmit power balancing, and channel width strategies (HT20/40/80).
Roaming: Min RSSI settings and Fast Roaming (802.11r) tuning.
Hardware: Firmware management and adoption workflows for APs and switches.

📚 External Resources Link to heading

Ubiquiti Help Center - Official support articles and guides.
Ubiquiti Community - User forums and release channels.

ZFS

Mon, 01 Jan 0001 00:00:00 +0000

Deep dive into the Z File System architecture, independent of the specific operating system implementation.

📐 Storage Layout Link to heading

VDEVs: Topology choices (Mirrors, RAIDZ1/2/3) and expansion.
Special Devices: SLOG (Write Intent Log) and L2ARC (Read Cache) usage.

⚡ Properties & Tuning Link to heading

Performance: Recordsize tuning, compression algorithms (LZ4/ZSTD), and ashift.
Data Integrity: Checksums, Copy-on-Write (CoW) mechanics, and resilvering priorities.

🔄 Operations Link to heading

Snapshots: Creation, retention policies, and zfs send/recv workflows.
Recovery: Pool import flags and disaster recovery.

📚 External Resources Link to heading

OpenZFS Documentation - The upstream project documentation.