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synch two ec2 instance for elastic load balancer in AWS
  1. Your EC2 instances need to be exact copies of each other, meaning they need to run exactly the same software stack. As far as the database is concerned you need have a single backend database (unless you are sharding your data) If you want more reliability and faster read performance you want to setup database replication. (You can accomplish this with RDS)

  2. Use RDS for database backend.

  3. More than EBS I think to have your instances exactly the same you want to use AMIs. AMIs are Amazon instance images that are based off an EBS Snapshot.

Hope this helps.

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