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I have set up 2 ubuntu instances in aws. How do I sync /usr/ubuntu in both the machines?

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You can use rsync command to sync two directories, e.g:

rsync -avzhe ssh -i yourkey.pem /usr/ubuntu root@ec2ip:/usr/ubuntu
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This question has at least two answers.

If you need periodically sync your folders, you can use rsync.

If you need persistent sync and /usr/ubuntu is distinguished disk partition, then you can use DRBD. It's like Net-RAID. Describe and documentation about DRBD - DRBD official site.

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Set up one of the instances as an NFS server that exports the directory for the other instance to mount.

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