On Jul 25 2012, wbr...@e1b.org wrote:

Chris Buxton <chris.p.bux...@gmail.com> wrote on 07/25/2012 12:07:22 PM:

> It doesn't sync the files to make two equal copies. It applies all of
the
> outstanding transactions in the journal file to the zone file and then

> empties the journal.

I don't believe that is entirely correct. The journal file needs to be retained to support ixfrs. My understanding is that it will be automatically trimmed to max-journal-size, if that option is set.

Do you know how it determines what is kept?

When the journal file reaches the max-journal-size value, roughly the
first half of it is discarded. But there are other actions that can
discard the whole journal file, such as "rndc freeze" on a type master
zone, "rndc retransfer" on a type slave one, etc.

To find out if a journal file goes back far enough for your purposes,
use the named-journalprint utility distributed with BIND. Although I
have to say I would hate to be dependent on this way of recovering a
lost zone file: you should probably be rethinking your whole backup
and recovery strategy.

--
Chris Thompson
Email: c...@cam.ac.uk
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