Public disk and symbolic links in Laravel - Performance & Optimization

Performance: Public disk and symbolic links

MEDIUM IMPACT

This concept affects page load speed by controlling how static files are served and how quickly the browser can access public assets.

Serving user-uploaded files efficiently in a Laravel app

Laravel

Create a symbolic link from public/storage to storage/app/public using 'php artisan storage:link'.

This avoids file duplication by linking directly to storage, enabling faster file access.

📈 Performance GainReduces disk usage and speeds up asset delivery, improving LCP.

Serving user-uploaded files efficiently in a Laravel app

Laravel

Copy user files from storage/app/public to public/ manually or on every request.

This duplicates files and causes unnecessary disk usage and slower file access.

📉 Performance CostAdds extra disk I/O and delays page load due to file copying.

Performance Comparison

Pattern	DOM Operations	Reflows	Paint Cost	Verdict
Manual file copying to public folder	N/A	N/A	Increased due to slower asset load	[X] Bad
Symbolic link from public/storage to storage/app/public	N/A	N/A	Minimal, fast asset load	[OK] Good

Rendering Pipeline

When a browser requests a public asset, the web server resolves the symbolic link to the actual storage location, serving the file without extra copying.

→Network Request

→File System Access

→Browser Rendering

⚠️ BottleneckFile System Access when copying files instead of linking

Core Web Vital Affected

LCP

This concept affects page load speed by controlling how static files are served and how quickly the browser can access public assets.

Optimization Tips

1Use 'php artisan storage:link' to create symbolic links instead of copying files.

2Avoid duplicating files to reduce disk usage and speed up asset delivery.

3Fast access to public disk files improves Largest Contentful Paint (LCP).

Performance Quiz - 3 Questions

What is the main performance benefit of using a symbolic link for Laravel's public disk?

A Avoids duplicating files and speeds up asset delivery

B Increases security by hiding files

C Automatically compresses files for faster loading

D Reduces server CPU usage by caching files

DevTools: Network

How to check: Open DevTools, go to Network tab, reload the page, and check the loading time and size of assets served from storage.

What to look for: Look for fast response times and no extra delays caused by file copying or missing files.

Practice

1. What is the main purpose of the public disk in Laravel's filesystem?

easy

A. To store files that should be accessible publicly via the web

B. To store configuration files for the application

C. To keep temporary cache files hidden from users

D. To store database backups securely

Solution

1. Step 1: Understand the role of the public disk

   The public disk is designed to hold files that need to be accessed by users through the web, such as images or documents.

2. Step 2: Compare with other storage uses

   Other disks like local or private are for internal use, not for public access.

3. Final Answer:

   To store files that should be accessible publicly via the web -> Option A

4. Quick Check:

   Public disk = public files [OK]

Hint: Public disk means web-accessible files [OK]

Common Mistakes:

• Confusing public disk with private storage
• Thinking public disk stores config or cache files
• Assuming public disk is for backups

2. Which Artisan command creates a symbolic link from public/storage to storage/app/public?

easy

A. php artisan storage:create-link

B. php artisan make:link

C. php artisan link:storage

D. php artisan storage:link

Solution

1. Step 1: Recall the correct Artisan command

   Laravel uses php artisan storage:link to create the symbolic link for public storage access.

2. Step 2: Verify other options

   Other commands listed are not valid Laravel Artisan commands for this purpose.

3. Final Answer:

   php artisan storage:link -> Option D

4. Quick Check:

   Storage link command = storage:link [OK]

Hint: Use 'storage:link' to create public storage link [OK]

Common Mistakes:

• Using incorrect Artisan command names
• Confusing 'make' or 'create' with 'storage:link'
• Trying to create symbolic links manually without Artisan

3. Given the following code snippet, what will Storage::disk('public')->url('file.txt') return if the symbolic link is correctly created?

use Illuminate\Support\Facades\Storage;

$url = Storage::disk('public')->url('file.txt');
echo $url;

medium

A. storage/app/file.txt

B. http://your-app-url/storage/file.txt

C. /public/storage/file.txt

D. /storage/app/public/file.txt

Solution

1. Step 1: Understand Storage::url() behavior on public disk

   When the symbolic link is created, Storage::url() returns a URL starting with '/storage/' pointing to the public folder.

2. Step 2: Confirm the full URL format

   The method returns a full URL including the app's base URL, so it looks like 'http://your-app-url/storage/file.txt'.

3. Final Answer:

   http://your-app-url/storage/file.txt -> Option B

4. Quick Check:

   Storage::url() returns public URL [OK]

Hint: Storage::url() returns full public URL [OK]

Common Mistakes:

• Expecting a file system path instead of URL
• Confusing storage path with public URL
• Missing the base URL in the returned string

4. You ran php artisan storage:link but your files in storage/app/public are not accessible via the browser. What is the most likely cause?

medium

A. You forgot to clear the application cache

B. The files are not readable by the web server

C. The symbolic link was not created or points to the wrong folder

D. The public disk is not configured in config/filesystems.php

Solution

1. Step 1: Check the symbolic link existence and target

   If the symbolic link is missing or points incorrectly, files won't be accessible via public/storage.

2. Step 2: Consider other causes but focus on link

   While file permissions matter, the most common cause after running the command is a failed or incorrect link creation.

3. Final Answer:

   The symbolic link was not created or points to the wrong folder -> Option C

4. Quick Check:

   Broken or missing link = no public access [OK]

Hint: Check symbolic link path if files not accessible [OK]

Common Mistakes:

• Assuming cache clearing fixes symbolic link issues
• Ignoring file permissions as a cause
• Not verifying the link target folder

5. You want to serve user-uploaded images stored in storage/app/public/images via the web. Which steps correctly set this up in Laravel?

hard

A. Run php artisan storage:link and access images via /storage/images/filename.jpg

B. Move images to public/images and access directly without symbolic links

C. Configure a new disk in config/filesystems.php pointing to public/images and use Storage::url()

D. Create a route to read files from storage/app/public/images and return them manually

Solution

1. Step 1: Create symbolic link for public storage

   Running php artisan storage:link creates a link from public/storage to storage/app/public, making files accessible.

2. Step 2: Access images via the public URL path

   Files inside storage/app/public/images are then accessible at /storage/images/filename.jpg.

3. Final Answer:

   Run php artisan storage:link and access images via /storage/images/filename.jpg -> Option A

4. Quick Check:

   Symbolic link + /storage/ URL = public access [OK]

Hint: Use storage:link and /storage/ URL for public files [OK]

Common Mistakes:

• Moving files manually instead of linking
• Not using the symbolic link and expecting direct access
• Overcomplicating with custom routes unnecessarily