Rsync

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Syntax:

rsync -ave ssh user@server:source destination

Example:

rsync -ave ssh user@server:/home/steviewdr/public_html /home/steviewdr/

Scenario - Migrating MySQL Server

Recently migrating a MySQL Server. We had a new one setup. There was ~8GB of data in /var/lib/mysql needing to be sync'd.

Option A: shutdown mysql and copy across /var/lib/mysql Option B: Use rsync to sync the data. That way, downtime would only take 1-2 minutes (to resync latest modified files etc.

rsync switches used for sync

#ssh into current mysql server, and run:
rsync -avPin --delete /var/lib/mysql newhost:/var/lib/

a = archive (equals -rlptgoD  for recursive, group, owner, permissions etc.)
v = verbose
P = progress
i = itemise changes
n = dry run (remove the n, for the proper run)
--delete = delete files on target, which were deleted on host since last run.

After than runs. Stop MySQLd on current server, and run the same rsync again.

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