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How to properly configure EC2 load balancing to ensure real-time file synchronization?

I am new to EC2. I read a lot about it, watched a lot of videos and a tutorial and pretty much knew how it worked. I still have few questions that I cannot find direct answers to.

If I have 3 instances (linux) with load balancing, all serving the same site, and the site is dynamic php / mysql, managed when users send files to forum topics every second, as the database and files are synchronized with all in three instances in real time.

  • Do I need to have a database on RDS, where each instance simply points to it.
  • How about user files. If the user uploaded the file to the site, this file should be immediately available in all instances immediately, as possible. I do not think that 3 copies to 3 copies are very practical.
  • If I change the site, say, change something in the CSS file, how can I synchronize the changes to all instances.
  • How EBS or S3 play a role in all of this.
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Do I need to have a database in RDS, where each instance simply points to it.

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