Nginx多Location块与try_files配置问题：跨域名共享目录资源失败求助

Hi there! Let's troubleshoot those annoying 404 errors you're getting when trying to share pics and docs across your domains—this is a common Nginx config gotcha, so we'll get it sorted quickly.

The Root Cause #

The issue here is how Nginx handles the root directive inside your location blocks. When you use root /home/admin/domain1.com; for /pics/, Nginx tries to look for files at /home/admin/domain1.com/pics/house.jpg (it appends the matched location path to the root you specified). But based on your setup, those folders are actually inside domain1's document root—likely /home/admin/domain1.com/html/pics/ (matching domain2's structure). That mismatch is why you're hitting 404s.

Fix 1: Use alias (Recommended for This Scenario) #

alias is designed exactly for cases where you need to map a location path to a different directory structure—it replaces the matched location part with the path you specify, instead of appending it. Update your domain2 config like this:

root /home/admin/domain2.com/html;
index index.php index.html;

location /pics/ {
    alias /home/admin/domain1.com/html/pics/;
    # Optional: Add caching headers for static files
    expires 30d;
    add_header Cache-Control "public, no-transform";
}

location /docs/ {
    alias /home/admin/domain1.com/html/docs/;
}

location / {
    try_files $uri $uri/ =404;
}

location ~ \.php$ {
    include snippets/fastcgi-php.conf;
    fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
}

Fix 2: Adjust the root Path #

If you prefer to stick with root, just point it to domain1's actual document root instead of the parent folder. This way, Nginx appends the /pics/ path correctly:

location /pics/ {
    root /home/admin/domain1.com/html;
}

location /docs/ {
    root /home/admin/domain1.com/html;
}

Quick Post-Fix Checks #

• Permissions: Make sure the Nginx runtime user (usually www-data) has read access to domain1's pics and docs folders. Run these commands to fix permissions if needed:

  chown -R www-data:www-data /home/admin/domain1.com/html/pics /home/admin/domain1.com/html/docs
  chmod -R 755 /home/admin/domain1.com/html/pics /home/admin/domain1.com/html/docs
  

• Reload Nginx: After updating the config, always validate it first:

  sudo nginx -t
  

  If no errors pop up, reload the service to apply changes:

  sudo nginx -s reload
  

That should get your cross-domain file sharing working as expected!

备注：内容来源于stack exchange，提问作者Rad