DNS and resolvers improvements
------------------------------
Key: TS-313
URL: https://issues.apache.org/jira/browse/TS-313
Project: Traffic Server
Issue Type: Improvement
Reporter: Miles Libbey
Priority: Minor
(was yahoo bug 1542263)
Original description
by Leif Hedstrom 2 years ago at 2007-10-16 17:00
There are two options to configure/manage how TS finds resolvers via
records.config:
CONFIG proxy.config.dns.round_robin_nameservers INT 0
CONFIG proxy.config.dns.nameservers STRING NULL
Without these set, TS will simply "parse" /etc/resolv.conf, to find
nameserver/resolver entries. This is
fine. However, there are a few things that are "broken" or could be improved
with the two options above:
1) If you want to do "round robin" over your resolvers, you must also
explicitly define the set of servers in
the dns.nameservers config. There is no way to have it round robin over the
default resolvers from /etc/resolv.conf.
2) You can not set an explicit set of dns.nameservers, without also making them
be used in a round robin fashion. This
is highly undesirable for instance if you want to use a local resolver first
(listening on 127.0.0.1), but fall
back to a set of regular resolvers.
3) Once listing explicit dns.nameservers, there is no way to have it also add
the implicit resolvers from
/etc/resolv.conf. It'd be very useful if you could "include" an external
filename as part of the nameservers
list, e.g.
"127.0.0.1,/etc/resolv.conf"
I'd suggest we separate the intertwined relationship between the two options,
which would solve issues #1 and #2. As a
bonus feature, we should be able to either implement the flexibility of #3, or
at least make it possible (via a new
config option) to include /etc/resolv.conf resolvers even when dns.nameservers
is set.
Marking this as an RFE, as it's not exactly a bug, but it's still somewhat
critical for us to support this properly.
Comment 1
by Yung-Zen Lai 21 months ago at 2008-07-09 18:56:24
Per issue #2, "proxy.config.dns.nameservers" config currently only works while
setting "CONFIG
proxy.config.dns.round_robin_nameservers INT 1". Even only one dns.nameservers
is set. It seems not that make
sense. ^^a
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