21 Čec
2017
21 Čec
'17
10:35
Hello Anand and Jan,
You are right. This case cannot be handled easily. We will extend the zone-purge command
to be able to purge a specific unknown zone or all unknown zones from the databases
(journal, timer, and kasp). Since Knot 2.5.0 it is easy because the databases are common
for all zones, so there is no zone-specific configuration for them.
Daniel
On 07/21/2017 10:18 AM, Jan Včelák wrote:
Hey,
I think your arguments make sense, Anand. I would just suggest
slightly different solution: Add control command that removes all
orphaned zones from the journal (knotc journal-gc). It will be more
practical as you wouldn't have to call it for each zone you have
removed. It will be idempotent and less error prone in the end.
Jan
On Thu, Jul 20, 2017 at 5:30 PM, Anand Buddhdev <anandb(a)ripe.net> wrote:
Hello Knot DNS developers,
I have an observation about newer versions of Knot which use the new
single LMDB-based journal.
Suppose I have 3 slave zones configured in my knot.conf. Let's call them
zone1, zone2 and zone3. Knot loads the zones from the master and writes
data into the journal. Now suppose I remove one zone (zone3) from the
config, and reload knot. The zone is no longer configured, and querying
knot for it returns a REFUSED response. So far all is according to my
expectation.
However, if I run "kjournalprint <path-to-journal> -z", I get:
zone1.
zone2.
zone3.
So the zone is no longer configured, but its data persists in the
journal. If I run "knotc -f zone-purge zone3." I get:
error: [zone3.] (no such zone found)
I'm told that I should have done the purge first, *before* remove the
zone from the configuration. However, I find this problematic for 2 reasons:
1. I have to remember to do this, and I'm not used to this modus
operandi; and
2. this is impossible to do on a slave that is configured automatically
from template files. On our slave servers, where we have around 5000
zones, the zones are configured by templating out a knot.conf. Adding
zones is fine, but if a zone is being deleted, it will just disappear
from knot.conf. We keep no state, and so I don't know which zone is
being removed, and cannot purge it before-hand.
Now, the same is kind of true for Knot < 2.4. But... there is one major
difference. Under older versions of Knot, zone data was written into
individual files, and journals were written into individual .db files. I
can run a job periodically that compares zones in knot.conf with files
on disk, and delete those files that have no matching zones in the
config. This keeps the /var/lib/knot directory clean.
But in newer versions of Knot, there is no way to purge the journal of
zone data once a zone is removed from the configuration. For an operator
like me, this is a problem. I would like "knotc zone-purge" to be able
to operate on zones that are no longer configured, and remove stale data
anyway.
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