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Antw: Weird DNS round-robin issue
Hi!
Did you read the bind manual pages about "sortlist"?
Ulrich
>>> Dennis Leeuw <D.Leeuw@umcutrecht.nl> schrieb am 18.02.2014 um 10:33 in
Nachricht <530328F0.4090903@umcutrecht.nl>:
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> Hi all,
>
> I hope I am on the right list for the problem I am experiencing.
>
> We have two subnets
> 192.168.196.
> 192.168.222.
>
> Our main LDAP servers run in 192.168.196. and are load-balanced by
> round-robin DNS.
> The 192.168.196. network is exhausted, so we added a new LDAP slave to
> 192.168.222. and added the IP address to the round-robin pool.
> But it seems that it is only used by other servers in the 192.168.222
> network and not by servers in the 192.168.196. network
>
> This setup has now been running for 6 days, with nscd.conf:
> enable-cache hosts yes
> positive-time-to-live hosts 3600
> negative-time-to-live hosts 20
> suggested-size hosts 211
> check-files hosts yes
> persistent hosts yes
> shared hosts yes
> max-db-size hosts 33554432
>
> and nslcd.conf:
> uid nslcd
> gid ldap
> uri ldap://ldap.div.ourdomain.nl/
> base dc=div,dc=ourdomain,dc=nl
> ssl no
> tls_cacertdir /etc/openldap/cacerts
>
> The LDAP server in the 192.168.222 range serves only 33 connections
> all from the 192.168.222 range, and the 2 hosts in the 192.168.196
> range serve 599 and 706 connections. The last 2 servers do serve the
> 143.121.222. network also. So might there be some caching issue?
>
> $ getent ahost ldap.div.ourdomain.nl
> 192.168.196.190 STREAM ldap.div.ourdomain.nl
> 192.168.196.190 DGRAM
> 192.168.196.190 RAW
> 192.168.196.151 STREAM
> 192.168.196.151 DGRAM
> 192.168.196.151 RAW
> 192.168.222.179 STREAM
> 192.168.222.179 DGRAM
> 192.168.222.179 RAW
>
> Is this the right list for this question? And if so can someone help
> me understand what is going on?
>
> With kind regards,
>
> Dennis Leeuw
>
> - --
> ICT Medewerker
> Divisie Biomedische Genetica
> UMC Utrecht
> Heidelberglaan 100 STR2.126
> 3584 CX Utrecht
> The Netherlands
> 06 27744048
> intern: 64048
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