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- #!/bin/cat
- $Id: FAQ.TTL.txt,v 1.2 2018/05/24 11:34:30 gilles Exp gilles $
- This document is also available online at
- https://imapsync.lamiral.info/FAQ.d/
- https://imapsync.lamiral.info/FAQ.d/FAQ.TTL.txt
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- Imapsync tips about TTL when changing name resolution of hosts
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- Why decrease the TTL (Time To Live) delay in DNS configuration, down
- to 5 minutes?
- A small TTL is not mandatory, it's safer and more easy to work with when
- migrating.
- It's about how long it takes to be sure the users are using the new
- imap host, and how long it takes to be sure all new incoming messages
- are going right now at the right place. Will you shut down the old
- server just after the resolution change? I guess you won't and you'll
- be right.
- The TTL is just a value, very well supported by machines, with a
- little name resolution supplementary work for them when it is set to a
- small value like 5 minutes, but it's a tremendous comfort for migrator
- people like us.
- Be sure to wait 24h after this TTL change before changing any
- resolution since the TTL change has to be propagated as well. After
- the migration done, no problem to set back the TTL to 24h or more. If
- you can't decrease TTL under 4h or even 24h, it's ok anyway, imapsync
- can sync the new messages dropped in the old server.
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