VPS File Sync Troubleshooting

My site runs on a VPS and I’m facing a puzzling issue: whenever I modify or upload files, the changes either never show up at all on the public-facing site. The goal is to track down the root cause of this issue and apply a fix so every deployment reflects instantly, just as it should.

Here’s what you’ll walk into:
• A Linux-based VPS with full SSH access
• No CDN or external cache configured—at least none that I’m aware of

Typical culprits might include aggressive server-side caching, misconfigured opcode cache, faulty symlinks, or permissions out of sync. Whatever the source, I need a clear diagnosis and an actionable solution.

Deliverable & acceptance: after your work, I will push a test commit; refreshing the browser should reveal the update immediately without manual cache purges. A brief summary of what you changed and why will close the loop for me.

If you’re comfortable combing through logs, Apache configs, and cache layers on a VPS to eliminate this lag once and for all, let’s get started.