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Owanio's Technical Blog

website·Indexed 30 days ago

https://blog.owanio1992.dpdns.org

A technical knowledge base covering infrastructure architecture, Kubernetes (K8s) networking and CRDs, log pipeline benchmarks (Fluent Bit, Vector, Elastic Agent), virtualization with virt-manager and Vagrant, and Linux system administration including ELK stack installation and S3 compatible storage comparisons.

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What's inside Owanio Blog

  1. Overview of Grafana Alloy

    Grafana Alloy is an all-in-one observability collector (the successor to Grafana Agent) capable of collecting metrics, logs, and traces.

    Key Advantages:

    • Automatic Discovery: Supports discovery of scrape targets.
    • Integrated Exporters: Includes multiple built-in metric exporters, reducing the need for separate exporter installations. Note: Built-in exporters may produce metric names/labels that differ from community versions, potentially requiring dashboard updates.

    Limitations:

    • Log support is currently limited to Loki.

  2. Overview of HashiCorp Vault capabilities

    HashiCorp Vault is a system for managing sensitive information. Its core capabilities include managing static secrets, certificates, identities, authentication, 3rd-party secrets, and sensitive data to support regulatory compliance. It is extensible via plugins for custom authentication flows, general secret generation/transformation, and dynamic database credentials.

  3. Overview of the Lite-weight SSH PAM System

    The Lite-weight SSH PAM system is a web-based tool designed to manage and establish SSH connections to remote servers. It consists of a frontend interface for connection details and terminal display, and a backend WebSocket server that bridges the frontend to the target SSH servers. The system is designed for minimal resource consumption, requiring only 1 CPU core and 512MB of RAM.
    GitHub Repository: https://github.com/owan-io1992/web-ssh-client

  4. Overview of Outline knowledge base features

    Outline is a knowledge management system similar to Notion that supports the following core capabilities:

    • Markdown Support: Features a WYSIWYG (What You See Is What You Get) editor to simplify document creation.
    • Collaboration: Designed for team-based knowledge sharing.
    • Access Control: Supports Single Sign-On (SSO) for account management and granular permission controls to prevent unauthorized access.
    • Deployment: Supports self-hosting for use within private networks.
    • Additional Features: Includes document history, commenting, and support for Mermaid diagrams.

  5. Overview of mise runtime manager

    mise is a tool used to centrally manage runtimes (e.g., Python, Golang, Node.js) and CLI tools (e.g., awscli, ansible, gcloud). It supports environment and task management (as an alternative to make) and allows for runtime versioning at both a global level and a directory level. It is designed as a more powerful and easier-to-use alternative to asdf.

  6. Overview of Distrobox for Linux application isolation

    Distrobox allows users to create containers (using Docker or Podman) that are highly integrated with the host system. It provides access to the user's HOME directory, external storage, USB devices, audio, and graphical interfaces (X11/Wayland). This is particularly useful for running software that requires a newer or older version of a desktop environment or library than what is provided by the host OS without affecting the host's stability.

  7. Overview of uv for Python Project Management

    uv is a high-performance Python package installer and resolver written in Rust, designed as a fast alternative to pip and pip-tools. It supports pyproject.toml and requirements.txt standards. Key advantages include speeds 10-100x faster than pip, a universal lockfile for environment consistency across teams and CI, disk-space efficiency via a global cache, and native support for Cargo-style workspaces for monorepo architectures.

  8. Overview of Pgpool-II for PostgreSQL High Availability

    Pgpool-II is a middleware proxy that sits between the application and PostgreSQL servers to provide a single database system interface. Its core features include:

    • Connection Pooling: Reduces resource overhead by reusing established connections.
    • Load Balancing: Automatically routes write operations (INSERT/UPDATE/DELETE) to the Master node and read operations (SELECT) to Slave nodes.
    • High Availability (Watchdog): Monitors node health and triggers failover if the Master fails; multiple Pgpool-II instances can monitor each other to avoid a Single Point of Failure (SPOF).
    • Connection Limiting: Queues requests when the connection limit is exceeded to protect the database from crashing.

  9. Overview of K3s Lightweight Kubernetes

    K3s is a certified, lightweight Kubernetes distribution developed by Rancher Labs, specifically optimized for edge computing, IoT devices, and resource-constrained environments. It is packaged as a single binary (under 70MB), reducing dependencies and the attack surface. It supports ARM64 and ARMv7 architectures and is fully CNCF certified, ensuring compatibility with standard Kubernetes applications and tools.

  10. Overview of Pgpool-II for PostgreSQL High Availability

    Pgpool-II is a middleware proxy that sits between the application and PostgreSQL servers to provide the following core features:

    • Connection Pooling: Reduces resource overhead by reusing a set of established connections.
    • Load Balancing: Automatically routes write operations (INSERT/UPDATE/DELETE) to the Master node and read operations (SELECT) to Slave nodes based on weight.
    • High Availability (Watchdog): Monitors node health and triggers failover if the Master fails. Multiple Pgpool-II instances can monitor each other to prevent a Single Point of Failure (SPOF).
    • Connection Limiting: Queues requests when the connection limit is reached to protect the database from crashing.

  11. Overview of Vagrant Core Concepts

    Vagrant is an open-source tool for creating and managing portable, reproducible development environments through automation. Key concepts include:

    • Box: A base image (template/snapshot) of a virtual machine with a pre-installed OS.
    • Provider: The underlying virtualization technology (e.g., VirtualBox, VMware, Hyper-V, Docker). VirtualBox is recommended for beginners.
    • Vagrantfile: A Ruby-based configuration file that defines the VM settings, including the box, network, shared folders, and provisioners.
    • Provisioner: Tools used to automatically install software or configure the system after the VM boots (e.g., Shell scripts, Ansible, Chef, Puppet).

  12. Overview of the Lite-weight SSH PAM System

    The Lite-weight SSH PAM system is a web-based tool designed to manage and establish SSH connections to remote servers. It consists of a user-friendly frontend for connection details and terminal display, and a backend WebSocket server that bridges the frontend requests to the target SSH servers. The system is designed for minimal resource consumption, requiring only 1 CPU core and 512MB of RAM.
    # GitHub Repository
https://github.com/owan-io1992/web-ssh-client