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guigouz
n00b
Joined: 22 Apr 2004
Posts: 33
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 Posted: Mon Apr 11, 2005 8:18 pm Post subject: DNS: CNAME and other data |
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I'm trying to setup my servers in a way I can change them if some of them fail
The idea is to have all the domains zone files on the DNS as CNAMEs, and to have a master domain with really low TTLs so I can change its IP address if one of the server fails
for the master domain, I have
| Quote: | masterdomain.com. IN SOA dns.masterdomain.com. (
root.masterdomain.com.
2004061119 ; serial
4H ; refresh
2H ; retry
2W ; expire
15M ) ; minimum
IN NS ns.masterdomain.com.
IN MX 10 mail.masterdomain.com.
IN A 1.2.3.4
www IN A 1.2.3.4
mail IN A 1.2.3.4
ns IN A 1.2.3.4
server IN A 1.2.3.4
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Now for the other servers, I have
| Quote: | otherdomain.com. IN SOA dns.masterdomain.com. (
root.masterdomain.com.
2004061119 ; serial
4H ; refresh
2H ; retry
2W ; expire
15M ) ; minimum
IN NS ns.masterdomain.com.
IN MX 10 mail.masterdomain.com.
www IN CNAME server.masterdomain.com.
mail IN CNAME server.masterdomain.com.
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Ok
If I add something like "IN CNAME server.masterdomain.com." to the second file (other servers) I get and error "CNAME and other data"... RFC1034 Section 3.6.2 says "If a CNAME RR is present at a node, no other data should be present; this ensures that the data for a canonical name and its aliases cannot be different.", but it fails even if there's only a CNAME on the zone file (besides the SOA).
If I don't add "IN CNAME..." all other subdomains work (www, mail) but "otherdomain.com" can't be resolved.
Any tips ? |
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jecepede
Apprentice
Joined: 19 Nov 2002
Posts: 239
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| Posted: Wed Apr 13, 2005 7:52 pm Post subject: CNAME |
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Ola !
I'm not a real expert in DNS and zone-filels but can I suggest you don't use a CNAME in a round robin config.
As the RFC already told you, you cant combine CNAMES with other zone-records
By the way, what do you mean with | Quote: | | if one of the server fails |
1: DNS fails ?
You could use a service like http://freedns.afraid.org to set up your free account (in slave mode naturally)
2: web/mail server fails ?
Make a round robin config like :
www IN A 1.2.3.4
www IN A 1.2.3.5
Note : the last solution distributes the "load" between the two machines, you might not want that... so solution 2.5 :
2.5 set you refresh time to 1 hour....
change de A-records....
and use rncd ehhr rcnd ? yadiyadia zone.file.co command to kick the new config into the world..
Greets
Jessy
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