Jekyll
Overview
Jekyll (지킬) is an open-source static site generator that creates static websites using Markdown, the Liquid template language, and HTML/CSS. Developed by Tom Preston-Werner in 2008, it is widely used for blogs, portfolios, and documentation sites due to its tight integration with GitHub Pages.
Main Content
1. Core Concepts of Jekyll
- Static Site Generation: Jekyll generates pure HTML, CSS, and JavaScript files that require no server-side dynamic processing. This offers advantages such as fast loading speeds, high security, and low hosting costs.
- Markdown Support: Content written in Markdown is automatically converted to HTML by Jekyll. This familiar syntax for both developers and writers boosts productivity.
- Liquid Templates: The Liquid template language allows variables, loops, conditionals, and more to be inserted into templates. This enables dynamic elements (e.g., recent post lists, category-based classification) to be implemented on a static site.
- Front Matter: YAML-format metadata (title, date, layout, tags, etc.) is defined at the top of each page or post. Jekyll parses this to structure the site.
2. Installation and Basic Usage
- Installation: Requires a Ruby environment; install with the command
gem install jekyll bundler.
- Create a New Project: Use
jekyll new my-site to generate a basic structure.
- Directory Structure:
- _posts/: Folder for blog posts. File names must follow the format YYYY-MM-DD-title.md.
- _layouts/: Stores page layout templates (default, post, page, etc.).
- _includes/: Stores reusable HTML fragments (navigation, footer, etc.).
- _data/: Manages site data in YAML, JSON, or CSV files.
- assets/: Stores static files such as CSS, JavaScript, and images.
- _config.yml: Global site configuration file (title, URL, plugins, etc.).
- Run Local Server: Use
bundle exec jekyll serve to preview the site at http://localhost:4000.
3. Key Features
- Blog Engine: Posts can be assigned dates, categories, and tags to automatically generate archive pages. Pagination is possible using the
paginate plugin.
- Custom Layouts: Layouts can be designed with HTML and Liquid, giving full control over site design. Multiple layouts can be structured in an inheritance hierarchy.
- Data Files: Structured data can be stored in the
_data folder and loaded into templates. For example, team member lists or price tables can be dynamically rendered.
- Collections: Custom content types (e.g., documents, projects) can be defined beyond posts. Each collection has its own output path and metadata.
- Plugin System: Jekyll supports various plugins, including automatic SEO tag generation (
jekyll-seo-tag), sitemap generation (jekyll-sitemap), and image optimization. GitHub Pages only allows safe plugins.
- GitHub Pages Integration: Jekyll is the default engine for GitHub Pages. Simply push to a repository, and it automatically builds and deploys to
https://username.github.io. It supports custom domains, HTTPS, and 404 pages.
4. Advantages and Disadvantages
- Speed: Static files are delivered quickly via CDN.
- Security: No database or server-side code reduces hacking risks.
- Cost: Free hosting services like GitHub Pages and Netlify can be used.
- Version Control: All content is in text files, making it easy to manage with Git.
- Lack of Dynamic Features: Features like comments, search, and user authentication rely on external services (Disqus, Algolia).
- Build Time: Build times can increase with larger sites.
- Learning Curve: Requires learning multiple technologies such as Ruby, Liquid, and YAML.
5. Alternatives and Comparison
- Hugo: Built on Go, very fast build times, suitable for large sites. Configuration is simple, but template syntax differs.
- Gatsby: React-based, offers dynamic features and a rich plugin ecosystem. It is a static site but supports client-side rendering.
- Next.js: A React-based framework that supports both static generation (SSG) and server-side rendering (SSR). Suitable for more complex web applications.
- 11ty (Eleventy): JavaScript-based, simple and flexible, supports multiple template languages. Requires less configuration than Jekyll.
Latest Trends
As of 2024-2025, Jekyll's market share among static site generators has slightly declined, but it remains widely used for personal blogs and project documentation sites due to its integration with GitHub Pages. Recent trends include:
- Cloud-Based Builds: Increasing use of CI/CD pipelines (GitHub Actions, Netlify, Vercel) for automatic building and deployment of Jekyll sites.
- Headless CMS Integration: Connecting headless CMS platforms like Contentful, Forestry, and CloudCannon with Jekyll allows non-developers to easily edit content.
- Performance Optimization: Active development of plugins focused on performance improvements, such as image optimization (
jekyll-cloudinary), CSS/JS minification, and lazy loading.
- Community Changes: Activity on Jekyll's official forum and Stack Overflow has decreased, but the GitHub repository is still actively maintained. Version 4.3.x was stably released in 2024, recommending Ruby 3.0 or higher.
- Migration Cases: Some users are switching to Hugo or 11ty for faster builds and modern features, but Jekyll's simplicity and GitHub Pages compatibility remain strong advantages.
Related Topics
- [[Static Site Generator]]
- [[GitHub Pages]]
- [[Markdown]]
- [[Liquid Template Language]]
- [[Ruby]]
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