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Posted to bugs@httpd.apache.org by bu...@apache.org on 2007/05/08 07:30:28 UTC
DO NOT REPLY [Bug 42349] New: - DNS round robin solution using CNAME is against RFC
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Summary: DNS round robin solution using CNAME is against RFC
Product: Apache httpd-2
Version: 2.3-HEAD
Platform: Other
OS/Version: other
Status: NEW
Severity: normal
Priority: P2
Component: Documentation
AssignedTo: bugs@httpd.apache.org
ReportedBy: apache.org@moto-coda.org
The Load Balancing solution 1 "DNS Round-Robin" as detailed here:
http://httpd.apache.org/docs/2.2/misc/rewriteguide.html
... is against RFC 2181, which states:
===
10.1. CNAME resource records
The DNS CNAME ("canonical name") record exists to provide the
canonical name associated with an alias name. There may be only one
such canonical name for any one alias. That name should generally be
a name that exists elsewhere in the DNS, though there are some rare
applications for aliases with the accompanying canonical name
undefined in the DNS. An alias name (label of a CNAME record) may,
if DNSSEC is in use, have SIG, NXT, and KEY RRs, but may have no
other data. That is, for any label in the DNS (any domain name)
exactly one of the following is true:
+ one CNAME record exists, optionally accompanied by SIG, NXT, and
KEY RRs,
+ one or more records exist, none being CNAME records,
+ the name exists, but has no associated RRs of any type,
+ the name does not exist at all.
===
Note the section that says "one" CNAME record, which means "not more than one".
>From what I've been able to determine, there was multiple CNAME support in BIND
4.x, however this was phased out (but still supported) in BIND 8.x, and has been
completely removed from BIND 9.1+. Other name services may or may not support
multiple CNAME records, however it is not a reliable method of load balancing
and should not be given as such in the documentation. At the very least the
documentation should point out that this feature may not (and is unlikely to) be
supported by most DNS systems.
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DO NOT REPLY [Bug 42349] - DNS round robin solution using CNAME is against RFC
Posted by bu...@apache.org.
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<http://issues.apache.org/bugzilla/show_bug.cgi?id=42349>.
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------- Additional Comments From serai@lans-tv.com 2007-06-13 23:25 -------
Created an attachment (id=20342)
--> (http://issues.apache.org/bugzilla/attachment.cgi?id=20342&action=view)
for trunk
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DO NOT REPLY [Bug 42349] - DNS round robin solution using CNAME is against RFC
Posted by bu...@apache.org.
DO NOT REPLY TO THIS EMAIL, BUT PLEASE POST YOUR BUG�
RELATED COMMENTS THROUGH THE WEB INTERFACE AVAILABLE AT
<http://issues.apache.org/bugzilla/show_bug.cgi?id=42349>.
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------- Additional Comments From serai@lans-tv.com 2007-06-13 23:36 -------
Created an attachment (id=20343)
--> (http://issues.apache.org/bugzilla/attachment.cgi?id=20343&action=view)
for trunk
There's no www6
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DO NOT REPLY [Bug 42349] - DNS round robin solution using CNAME is against RFC
Posted by bu...@apache.org.
DO NOT REPLY TO THIS EMAIL, BUT PLEASE POST YOUR BUG�
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<http://issues.apache.org/bugzilla/show_bug.cgi?id=42349>.
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serai@lans-tv.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |DUPLICATE
------- Additional Comments From serai@lans-tv.com 2007-07-04 23:44 -------
*** This bug has been marked as a duplicate of 23501 ***
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DO NOT REPLY [Bug 42349] - DNS round robin solution using CNAME is against RFC
Posted by bu...@apache.org.
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serai@lans-tv.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #20342|0 |1
is obsolete| |
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