Squashed commit of the following:
commit 73f0bba7d8d4763763ff88731c739ac646714ac8
Author: Mukund Sivaraman <muks@isc.org>
Date: Mon Jul 13 05:40:35 2015 +0530
Update rndc usage output
This is based on a patch sent by Tony Finch.
3938. [func] Added quotas to be used in recursive resolvers
that are under high query load for names in zones
whose authoritative servers are nonresponsive or
are experiencing a denial of service attack.
- "fetches-per-server" limits the number of
simultaneous queries that can be sent to any
single authoritative server. The configured
value is a starting point; it is automatically
adjusted downward if the server is partially or
completely non-responsive. The algorithm used to
adjust the quota can be configured via the
"fetch-quota-params" option.
- "fetches-per-zone" limits the number of
simultaneous queries that can be sent for names
within a single domain. (Note: Unlike
"fetches-per-server", this value is not
self-tuning.)
- New stats counters have been added to count
queries spilled due to these quotas.
See the ARM for details of these options. [RT #37125]
4056. [bug] Expanded automatic testing of trust anchor
management and fixed several small bugs including
a memory leak and a possible loss of key state
information. [RT #38458]
4055. [func] "rndc managed-keys" can be used to check status
of trust anchors or to force keys to be refreshed,
Also, the managed keys data file has easier-to-read
comments. [RT #38458]
4034. [func] When added, negative trust anchors (NTA) are now
saved to files (viewname.nta), in order to
persist across restarts of the named server.
[RT #37087]
4030. [func] "rndc delzone" is now applicable to zones that were
configured in named.conf, as well as zones that
were added via "rndc addzone". (Note, however, that
if named.conf is not also modified, the deleted zone
will return when named is reloaded.) [RT #37887]
4029. [func] "rndc showzone" displays the current configuration
of a specified zone. [RT #37887]
4005. [func] The buffer used for returning text from rndc
commands is now dynamically resizable, allowing
arbitrarily large amounts of text to be sent back
to the client. (Prior to this change, it was
possible for the output of "rndc tsig-list" to be
truncated.) [RT #37731]
3999. [func] "mkeys" and "nzf" files are now named after
their corresponding views, unless the view name
contains characters that would be incompatible
with use in a filename (i.e., slash, backslash,
or capital letters). If a view name does contain
these characters, the files will still be named
using a cryptographic hash of the view name.
Regardless of this, if a file using the old name
format is found to exist, it will continue to be
used. [RT #37704]
This is to be consistent with our common usage of just using a
plural "s" without apostrophe.
This was brought up via discussion in ticket 37505.
I didn't have this reviewed.
3943. [func] SERVFAIL responses can now be cached for a
limited time (configured by "servfail-ttl",
default 10 seconds, limit 30). This can reduce
the frequency of retries when an authoritative
server is known to be failing, e.g., due to
ongoing DNSSEC validation problems. [RT #21347]
